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The big difference in TV Alignment instruments:Ours Works.

The B & K Model 415 Sweep/Marker Generator not only works,but it makes alignment jobs faster and more accurate.

Why? Because it eliminates the need for a separate marker generator,sweep generator, marker adder, and bias supply.You get it all in one compact instrument.

And it's so easy to use. The IF and chroma bandpasses are simulatedon the front panel for constant reference. Lights tell you whichof the crystal -controlled markers are in use and where theyshould be located. And the exclusive marker tilt feature lets youplace the markers either horizontally or vertically, so you can alwaysidentify their exact positions.

Put the B & K Model 415 Sweep/Marker Generator to work for you.

Ask your distributor for complete details.

Product ofDYNASCAN CORPORATION1801 W. Belle PlaineChicago, Illinois 60613

Model 415:$399.95

... for more details circle 102 on Reader Service Card

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MAGNAVOX 1394 ZENITH 1397TV Chassis T961 Series Color TV Chassis 19CC19

MOTOROLA 1395Color TV Chassis TS -938 Series

NOTESUNLESS OTHERWISE SPECIFIED

I. ALL RESISTORS ARE 1/26,10%.2 CAPACITANCE VALUES GREATER THAN I ARE IN PICOFARADS,

LESS THAN I IN MICROFARAOS.

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100 100110141 THAT CORREIPOON TO MO TNFen le (FROM 1707 II el 110111101 31111414.1STUMM IT IS PlTIRLUI ILAITRE 0 ASO TNIRAITINTS Il10MTLT 0101TIKAINTIO TO UT TM Fife COLONIAA UAW 101 HONISIIITAT POLO CONTR. NT TNISOTICTION THAT 288011 le RAMA TO NOTTem. TM Rite 1511 II AIN. [LOLL TOC ..... Of in RAIN(I ALL 11110 AND COLOR WA0010101 MTH AI .....0 11091 AITO MON PITH TOM OhilCAPACITY Yen Me 11.0 104180 ASIITMIO801TIM. Oln101OS 00 CALIIRATION All Tel Of Tiff100011MI1 LINO OM COM. Mien.4 T. ouTrul ......MI OF 101 IC COLOR1111111103LAT0I CAA N 05111000 AT TH1 COLLICTONOf 7111 01011 OSTIVT 10411011010 1111* 11011113102 I I APO SIVA Mel OR TIITINHIALITIN YO e OM PANEL TA

COINTICT Wei TO TIMM. NIA I I ASTOR004 CONTROL TO PLACE el lex SAR Of rui COLONTAR GeleTOR TO MAOISM 11111531 DO NOT0DJINT HUE C0.1101. FOR SU510UII1T 11141110.101111 0431F110 AT TIFINITIAL IITA 1SIM1 THE

SAI MENU. AT W0101 NSA°. 0111111101NAT/FOAM AT TINIONIAL /111 10101 100 TAO AlISNOT 0 le T 10180 0041100

JOIE.. 113111111111 VICO*. 1011011111 VALOISLIES 1011 ONE IN NI 11 01011111 IICTACITTICI 3.1111 ILLY 201 ..... 00KPOIATIC MACIAS ION 0111.1. INICTIMITON IIOVACITIMIS ..... FAITS 1201 IIIIITOs1In TINCOIL .11.4.111111.11T4IT I 11111101

Me

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131.0 CENT

H. PHASE

RG VERT

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TYPICAL

SOCKET & PLUG

ro TAT-.

PLUG 110. NUMBER Of PINS

CONVERGENCE PANEL "HA-C'L702/B

PIPiP3

8 PINS12 PINS10 PINS

P5 AFT II PIN)P6 6 PINSP7 6 PINSP8 3 PINSP9 12 PINSPlO 10 PINSP11 12 PINSP12 6 PINSP13 A1T11 PINT

III Z0 31640 516 VS

70 16"9CIS 110 120

P4 (PIN SIDE)

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018.412

CS n066- RT SIDERC V

LINES

el IMMO I PONOLININoe II MCI -123 10 me.- PANE

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LAX/A

C701

81*

COPYRIGHT 1972 SY ELECTRONIC TECHNICIAN ier.ALER I EAnT FIRST STRFET, DULUTH. MINNESOTA 55E02

1396TRANSISTOR VOLTAGES IC91 3.58 OSC.

PHILCO-FORDColor TV Chassis22QT79

JANUARY 1972

021x1r -era

"

12

II

ELECTR/nEONIC 7 farwEmfi

COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 5 NEW SETS

04tell

1St 4.1.1.

IS51132

15

11; 31. 2412

.1,015LAD6X

001

iig%

TA.34:

35 itV 431 GM- - - ".. .0015 0015

5 1TUIER

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0 .21 3115.11. I1.32211

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021.54

203

5%

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/125.11IATRAP

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{L 1111103

52 Ill

SYMBOL DESCRIPTION PHILCO-FORD PART NO.

C9200 -power, ac 42-2136-1045.2656-36

CR91-3.58MHz osc 34-8043-546.5002-6

1C91-3.58MHz osc 46.5002-7L4 -1st IF 3L5 -2nd IF 322-44595572:32L10-41.25MHz trap 32-4959.8L41-horiz holdL92 -sound TO

32-4891-232-4936.1

F201 -4a

ICI Act

L93 -sound ratio delL94 -tint controlL99-chroma bandpass

I.F ES DETECTOR PANEL02 .1111/100/4 L11

1125

03 In oc01 LI MIK C141 1.6 %., .P/20 0/55 1/411 1. T jo

341 , j . IS52 .- - - - --. * r- - - -II

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3 RESISTANCES AN 115010 9110 (11COILIKE00 PART 01300412010

WC 0E0 Pm 00 130101010 RATOIED No Of RESISTOISO. INDICATES COOPOREITS C0/131 Sat 9 NINI

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32-4928-132-4112-63

32-4929.1

10 SENICT 511304+-50200 Poi 1

.1.4114

CgS.(4.121v

33.M9T1101

7200 -degaussing 33-1376-6RV55-horiz bias 33-1379-2SW200-normal service 42-2163.471 -audio output xformer 32-10174.1T2 -filter choke xformer 32-10155.1T3-vert output xformer

3322:110011305%1T4-horiz output xformerT5 -power xformer 32.10154:1VR1-3K, RF AGC amp emit 33-5628:14VR91-video drive

3333:55662382-6-1VR92-color killerVR93-CRT bias 33.5628-12VR201-12M, focus adj 33.5631-24

3-356456488-181

VR202-25K, volume 12007801VR203-50011. colorVR204-50011, horiz hold

3333:556122:2223V R205 -750K. vert holdVR207-1011, vert control

3333564-561362-2-51VR208-5000, brightnessVR209-100 n, contrast

3333-556428-2_42VR211-100K, tone 12001130/ 6476.14293-17yoke assy. 6-14236-1

tuner, VHF 1220779/80 LP)

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14

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MOMP

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1205;24C,5345-,

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W/COLOR BAR GEN.

TRANSISTOR FUNCTION E B C

095 BURST AMP 48 0 38

Q96 1ST CHROMA 17 .90 16.5097 COLOR KILLER 1 1.5 19.5099 BUFF AMP .65 1.3 17.50100 X DEMOD 1.8 1.44 13

0101 Z DEMOD 1.8 1.44 12

0102 2ND CHROMA .80 1.0 18.50103 BLANKER .68 -1.6 16.5

W/COLOR BAR GEN.

PIN VDC

11.42

3 1.54 05 1.5567 11.48 12.0

& K 1245 GEN. set at ch. 4 NOTESCRT BIAS MIN.

IF AGC set at mid -range BRIGHTNESS - FULL CCWApprox. 1.6VDC at tuner AGC

SERVICE SW. - NORMAL

CONTRAST - FULL CCWSEC. controls set for normal color bar pattern CHROMA - FULL CCW

Color bar gen. color ampl itude set for 1.5VDC at M102B & K meter 175Line voltage 120VACActive filter 20VDC at M13

TOSCO/10E MITCM -4.--

C223

.1.40310

00 -0

MOO PO 5 /0

4111 1.61.17111/1 ;75/ 3/ -95,501.108 'Ir

111245

110

11313

610

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1 X331

0921131

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5%

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WOPS

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p

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1,400, I

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so

10111411.411P

111314

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144

1LXSIX

101

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02550 =PS

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1111

5%

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mem oss 11190 7.04154

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4201(CoyNM

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MI

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MI

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GG2

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l Cocos cch ocean0444 444

Car OM MINIUMmo0c0.30/0 CAA CalCOrroms. PAL cow040.43. KC. CalSON. or Komi.LIME V011AGE INV AC

COPYRIGHT 1972 By ELECTRONIC TECHNICIAN/DEALER 1 EAST FIRST STREET, DULUTH. MINNESOTA 55802

P ic

INS

VOC

(

NUARY 1972

UHF TUNER

- -1_ UHF I

MPHFa«T,VHF 1111

IrS' T 711

L

ELECTRONIC _'=",t7'ina XCOMPLETE MANUFACTURERS' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 6 NEW SETS

mmoucT SAP im

JIVnt. V.7f

L.-,4- 22V

12 7.1:

a,11

4-22V

L

SOU

tAtZE

0L°2

4- V

SYMBOL DESCRIPTION GENERAL ELECTRIC PART P.O.

'RVAGCC VS'SMOW

R232-mmmommMI

R307-VOR1111020.1

C403C-3000.olomm,150.

PABC

YL

I fa

r

-1-140721

WE

1.1

S

1101,:11).21.1r1::"TORRESEPSOM'S

1911X:A.65268672536868w 637686

Str1;1116934812667/806561812

101 tle

4.1 OV I OV

11:T

22Y

:Iv

140

Ana.

E

",14rdmidi

L.-'3"

154

rIL

ZIT

.18

OSCILLOSCOPE WAVEFORM PATTERNS

These waveforms were taken with the receiver AGC control adjusted for an approximate peak -to -peak output of two voltsat the video detector, using an air signal. Do not reset AGC control when using color bar generator. All monochrome voltagestaken with average air signal and all chrome voltages taken with a color bar generator connected to the antenna input ter -miners. The chrome peak -to -peak voltages were taken with the chrome control set for 0.3V peak -to -peak at center tap of chrOnstcontrol or M110 and the tint control set for proper color bars lapproxlmatelv mid -range), all other controls set for normal view-ing. The frequencies shown are those of the waveforms not the sweep rate of the oscilloscope. All voltages taken with awide band scope having a 5MHz bandwidth similar to MK Model 1450. Line voltage, 120V.

q") 4 NI,(1) 2 VOLTS 0 i,V110..r". 0 "

M17

OM COLL. PIN 2 V92112A8.CONTR6p H2 75U Hz 5.]50 HZ

C ONTRAST IMITASTI

® "'BASE OF 041

raz-

12 2'2 g ®11 VOLTZ PZP.04.1 TOP E ND PIN 9 wiz sS 1 V42

?.1 voLTs P/P,TiS,VaLS

P/P.

691311'41' H2M1'03

vagz/P. 3 0.7 VOLTS 11,211.

25 V. IMP, ISYNC 095 EMR2

111

voLIS I 0 VOLTS 1,133 50 MHZ 3.58601112PIN 4 L97 OR 91341139MICE,

4,3.glLZP/P.0102 BASE1150.1161

6,,,,,OLTS097 COLL

BOV.11311.(coartnt.at po,M of st

of sync cornMemnon/ 1E750HZ Pin 7 V92

LINE VOLTAGE 120 VACAIR SIGNAL FOR MONOCHROME SIGNALSCOLOR BAR GEN. BON 1246 - FOR COLOR SIGNALSACTIVE FILTER AT 20 VDC

fi5V. IV, HAIN 0 40 VOLTS P,'111, 0 13 VOLTS IMP.

CON'15,750 HZ 15,750 112 15.750 H2

PIN 7 V92 m10 M11

0:' ...,V°LTS

(3 110 VOLTS 11/11. 0h,al

P2P.60 2

PIN 10 Val PIN 2. 6. 7 PIN 9 V41

0

HZ ISPINEI P.11.Y04-Z'P'200 VOLTS P., 041. 04260 H2 ISAWTOOTH/M46. OR PIN 4 V41

1rYV'®inYArt Inagn2r' LOOSE ® 12V02 l d3PO ,1XPIN 2 V42 PIN 6 va2 m61 WOO PLATE CM1. 0906

Tvgo17.0 Te7V680

"/".6 2400 /P".

CI©i1) VOLTS

THVONTIP".70V. PP. mwo, P P .SYNC.

M5.750 H2 MI25 M113126

6 VOLTZ'''. '11°

VOLTZ 0095 COLL, PIN 5 L95 PIN 4 L95 093.094

006zOLTSP,1P 12 VOLTS P P. 8 3 5 VOLTS Cr, (43 90 VOLTS 11,, 0 ,0 v,, p .,

15.750 HZ 17,500 H2 15750 HZ. CONT is,760 HZM. 0103 BASE 0103 EMIT. SET JUST BELOW 05 COLL.

COPOIMPRESNT OFSIONNC

SY

81123

PHI LCO-FORDColor TV Chassis22QT79

mussrts mamas

TIE tE

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lt lirIC tar NP

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0 660 VOLTS P ,P15,750 HZM45

FIBISMOSS

"MI

COPYRIGHT 1972 By ELECTRONIC TECHNICIAN/DEALER I swirl. FIRST STREET, DuL1.114. M.N./caw 55802COPYRIGHT IS. BY ELECTRONIC TECHNICIAN/DEALER 1 EAST Firm- sTREET. DULUTH. MINNESOTA 55802

1397ZENITH

Color TV Chassis19CC18

-7:47

.r...ELECTFTLIC 7J-TVET-Lp,----,4 X'

COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 5 NEW SETS--- _ _ _ ________ ,_ __ _ie ,,...cl,

I

R1I.r.2: . likrz .5 I

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i on.

V,1111. 1!

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arn

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,I

LEH

SRNLIMITER 4,2.21-17

COPYRIGHT 1972 HY ELECTRONIC TECHNICIAN/OEHLER , EAST FIRST 6TRER, DULUTH. MINNESOTA 68803

CEO

W 020B

VIOCO

1

A

cm,ouoc.. .o1.42Lem,

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--.4KCRIES OA. 00.0

COPYRIGHT 1.71 ay ELECTRONIC TECHNICIAN/DEALER 1 EAST FIRST STREET. DULUTH. MINNESOTA ESSOS

L203-Nlov 11

tO,r:en

7206-noo o

T117172!V0751tVfaut sod of 150.

OSCILLOSCOPE WAVEFORM PATTERNS

These waveforms were taken with the receiver AGC control adjusted for an approximate peak -to -peak output of two voltsat the video detector, using an air signal. Do not reset AGC control when using color bar generator. All monochrome voltagestaken with average air signal and all chroma voltages taken with a color bar generator connected to the antenna input ter-minals. The chroma peak -to -peak voltages were taken with the chroma control set for 0.3V peak -to -peak at center tap of chromecontrol or M110 and the tint control set for proper color bars (approximately mid -range), all other controls set for normal view-ing. The frequencies shown are those of the waveforms not the sweep rate of the oscilloscope. All voltages taken with awide band scope having a 5MHz bandwidth similar to B&K Model 1450. Line voltage, 120V.

0 2 VOLTS P/P,60 HZ (MAX.CONTRAST)M17

6.6 VOLTS P/P,15,750 HZBASE OF 041

© 16 VOLTS P./P,15.750 HZD41 TOP END

0 0.1 VOLTS P/P,± .05 15.750 HZ096 BASE

0'0

2 VOLTS P'P.ICHROMA)25V. P,P. (SYNC)R160. R173PIN 7 V9)

® 1.0 VOLTS P, P.3.58 MHZPIN 4 L97 ORM108

0 2 VOLTS P/P.15.750 HZ(MAX.C ONTRAST)M17

0 50 VOLTS P/P.15.750 HZM49

0 6 VOLTS P/P,15,750 HZPIN 9 V42

0 5.5 VOLTS P P.15,750 HZM103

30 0.7 VOLTS P/P,15,750 HZ095 EMIT

CI 1.0 VOLTS P P.3.58 MHZL98 -R139

0 4.2 VOLTS P/P.15.750 HZ093 COLL.

.11111114...1Nr.

50 VOLTS P/P60 HZM49

jVVO 45 VOLTS P/P.

15,750 HZPIN 1 V42

e .3 VOLTS P/P,15.750 HZ0102 BASER150, R151

EXPLODEDVIEW OFBURST OFVIEW 34

55 VOLTS P P.60 HZQ97 COLL

414$0 3.8 VOLTS P/P,

15,750 HZPIN 2 V92

O 85 VOLTS P/P,60 HZPIN 10 V41

VV\O 150 VOLTS P'P.

15,750 HZPIN 2 V42

O 7 VOLTS PIP.15.750 HZ0100 COLL.

OD 70 VOLTS P/P,15,750 HZ095 C OLL.

0.85 VOLTS P60 HZM102

80V. P,P. (contat point of startof sync com-pression) 15,750HZ Pin 7 V92

0 110 VOLTS P/P,60 HZPIN 2, 6, 7

ITT0 200 VOLTS P/P,

15,750 HZPIN 6 V42

0 8.5 VOLTS P P,15.750 HZ0101 COLL.

12 VOLTS P/P,15,750 HZPIN 5 L95

63 12 VOLTS P P,15.750 HZQ103 BASE

0 65V, P/P, (MIN.CON.) 15.750 HZPIN 7 V92

14 tu VOLTS P/P,60 HZPIN 9 V41

200 VOLTS P'P.15,750 HZM61

0 45 VOLTS P'P,(CHROMA)70V P'P, (SYNC)15.750 HZM126

12 VOLTS P/P,15.750 HZPIN 4 L95

(i) 3.5 VOLTS P'P.17,500 HZ0103 EMIT.

LINE VOLTAGE - 120 VACAIR SIGNAL - FOR MONOCHROME SIGNALSCOLOR BAR GEN. - B&K 1245 - FOR COLOR SIGNALSACTIVE FILTER AT 20 VDC

CD 40 VOLTS P/P,15.750 HZM10

0

15 1KV VOLTS P/P,60 HZ (SPIKE)200 VOLTS P/P.60 HZ (SAWTOOTH)M46. OR PIN 4 V41

0 15,750 HZ LOOSECOUPLEDV200 PLATE

4*

.) 17 VOLTS P P.CHROMAI70V. P'P. (SYNC)M125

6 VOLTS P P.3.58 MHZD93,094

® 90 VOLTS P P,15,750 HZ, CONTSET JUST BELOWPOINT OF SYNCCOMPRESSIONM123

0 13 VOLTS P/P,15.750 HZ011

10 12 VOLTS P'P,15,750 HZD41. D42

4.0 VOLTS P P.3.58 MHZCR91. 098 &C124

® 50 VOLTS P/P.HROMAI

70V. P/P, (SYNC)M113

IIIIIIIIIIIIII

1111111111

0.8 VOLTS P P.3.58 MHZPIN 3 IC91

30 VOLTS P P,15,750 HZ05 COLL.

PHI LCO-FORDColor TV Chassis22QT79

TRANUSTORIESISTANCES

Resostance mearkinmentS of trOnSiStOna in circuit (power off) yoke & convergence not connected.All measurements are In ohms and taken with B 6 K Model 120 VOMwith allowable tolerance

20%. DC polarity watch in "REV" position. Translator measurements (use 5100 scale).

NNW I TO IMO. 9 TO 01113. C TO 4110. C TO I-I- .1

C TO 11-I- I

0 TO a-I- .1

PUNCT1011

01 III V.1,. 330 1103 110 14110ants

XKOLOWS

1600itola

et Me V.I.F. 330 210D 1060 ii7.1

iii111i2

liBCI 71113 V.I.F. 270 ma WM

CM WED AOC 1100 ITN 300

"11:iltINVTr112)

CO III AOC 310 1500 1100 1N4:1)t1 #I)

1:t1ta

Of IR VI= 773 IR ...c., NOIC TIP. 0 MI Bs

ilMiilt"V

.11:fWIV421,2jr

091 211D I.I.F. IAA NO IIU) R:,

ittWY

COI IN I.I.F. WO 10 WO

OM =LAT ONVOI 720 1476 1010

'-iilif-Auo. NS ON1 lo, 1721 2100 1101

'LIU

4410

ON MOOT NIP 100 470 134

I*Sr"zr

ItaON INT CollOSIN 1119 1.92 ION

11031 ValOn taw ROLM 2.111 la Two ZOW WO. OWN at 2.17 700 Tr :it01

'\%a',1Wam mum NIP 70 IPS 950 II

ISOIr11.301

111201

IMP111001

01110 0 00030 470 1711 ION CO

10"0101 2 0000 000 1.221 3.00

0102 TITO GOOKS 112 70 Iwo ItleOft

IN

111,761

1::&°1

Ina

NMIItTom OWN WI IWO IMO

0201 WO. OUTPUT II 1.30 2U igiit"'MO ACTIVit NEM 200 1720 3.0104401

Tr110601

r1213.011

*At 1010001106

TINE RESISTANCES

TUVE FUNCTION 1 2 3 4 6 0 7 I 9 10 11 II

zt MIT igt L ..?:nas120} 1F

2.,r, 9000 0 F

1111. fflAO OUTNUT. 0 302

.211x C F

IF

F

1.10F

150220

.1.11112X

Sia;)25"ar- 0 0 200 0 0311x - - 2000 0

,r,; 0 _ - IN 1- WON -- IOC - 8

RX1003

NEM Ns 120SCALE ' WOO

1010000

16 VOLTS P P,3.58 MHZPIN 7 IC91

0-

e 660 VOLTS P/P.15,750 HZM45

1.6 VOLTS P P,3.58 MHZM107

420 VOLTS P/P,15.750 HZM48

COPYRIGHT 1972 BY ELECTRONIC TECHNICIAN/DEALER EAST FIRST STREET, DULUTH, MINNESOTA 55802

1397ZENITH

Color TV Chassis19CC19

I.F. 11071.17 714C41 TUNER

TO V. N. F.TUNER

.; +

P80111PLINilILIAD DO

raw,

SOCIZIO *MIPS OW

vlawl

ELECTRONIC 2_1-77Lff",..^aCOMPLETE MANUFACTURERS' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR S NEW SETS

ASSEMBLY (PAST 40.150.166)

NOTE ALL RESISTORS IN IF ASSEMOLy AREIF4 WATT UNLESS OTHERWISE SPECIFIED

4445,6

C1011101 on

I%

ST. 1.?COL

Ij110.6114410411074ADJUST

C1024,14

.L3V:0004

GoaSx ?TAPdnrr 004

P'1SY

61100:1 V7-T T-

3%

1 0101121-500 OR

1 121-501 ORI

121-5051ST. I.F.

6104

'%'

or 22

0104

0103u: '

121-846

1114

I°'

SOUND DET.AMP

112

oR

5%

6114

17.

LIOG

C120ISN

I6'145%

12$ I ICI

a

ra C126F

_J'%11)08*0104

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I121-5230R

114121-524 3RD. I.F.

SG Vle or10

1.011

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4,-I1.11,

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:ass, e_iacwI

TRAP -I

1T/TEL

120 VACINTERLOCK

SW203!PART OF P205/

010P

+240

IR

0401121-671SYNC. LIM.

115

>L4

PeiA.B.C.

LEVEL

82,3

TEL

8103

on

6031:1NF

MI0%

*74.35 1.1.43 SRR1,1 :558:2ND. I.F.

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4040

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65

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5%310

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cos

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1.14 13 86 Al U 2 US

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C25I12 A 001

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82105 518E0

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514

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4,302

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11255123

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42420207121-587VERTICALBLANKER

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4.36

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I SPACE COMMANDICNASS.S

MV ADJUST0332

EG

11.11

TEL

RE

TEL

RED

TO 11580.1544/01.Sari/RAM

18.701

P502

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Gel

2205

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TO iloPuT OFVOLTILGE TIIiLE1IS 51044 1111.0

L 210

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T20

0000

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0504

451::

2700

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20/50BRIGHT LIM.

CONTROL135464 FOCUS- NETWORK

8557IORIEG241

TTJ202

CONVERGENCESOCRET * CABLEILIAD IND VIEI

02404

'1 '-0206 I

411)121-746 * IA 3, 2 -03RD VIDEOICJ 9-37

C> INTERLOCK1412

4= ,0 T

1

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0 ?M"..02117 RINNI

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11401112 I

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1.01712CENT.

USED

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I

ASSEMBLYASSEMBLY

TO 00. FART 0.0.2.3.26311-o1 x6006

MOTUSED

CONVERGENCE 55EMEILT PART NO S-123579

Earl SIDE 8511IRAK .081 ISO

11E5

27P

11168T 510ESlut 140112 0640LIMES 1.601

64404 ConiOe

TOP SLY(MORI/ LINES

R110360.1%.

cso.c18818

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711F

SLY 810== -

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10/15 4/8,11110 =17/F rktoGfiL

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.29-.110W

R GVERT LINES

1106120

TOP PSG14081.2 L2425

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48

L-=`"13gr

6114/111271

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F

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DRML

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N.11/.120RED VENT

1

I2011 jTEL

MTV ER

OPYRIGHT 1972 BY ELECTRONIC TECHNICIAN/DEALER I EAST FIRST STREET, DULUTH. MINNESOTA 55802

1398

L301

asc so,is

"411

GENERALELECTRICTV Chassis U-1

JANUARY 1972

r - - - - - nUHF TUNER

I

I- - - - - - -1I _ UHF IUHF B+ INPUT 1

VHF TUNER

COlt

ELTEDMITAIERC 2_frVaarrAdea

COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 5 NEW SETS

PRODUCT SAFETY NOTICE

PRODUCT SAFETY SHOULD BE CONSIDERED WHEN A COMPONENTREPLACEMENT IS MADE IN ANY AREA OF A RECEIVER. THE SHADEDAREA OF THIS SCHEMATIC DI AND THE PARTS LISTDESIGNATE COMPONENTS IN WHICH SAFETY CAN !HOF SPECIALSIGNIFICANCE. IT IS PARTICULARLY RECOMMENDED THATGENERAL ELECTRIC CATALOGED PARTS BE USED FOR COMPONENTREPLACEMENT IN THE SHADED AREAS OF THIS SCHEMATIC.

USE OF SUBSTITUTE REPLACEMENT PARTS WHICH DO NOTHAVE THE SAME SAFETY CHARACTERISTICS AS RECOMMENDEDIN FACTORY SERVICE INFORMATION MAY CREATE SHOCK. FIREOR OTHER HAZARDS.

-1--11t"0+ AGC 1;

Lilt15040

+22V

.0..Itv

":41

L104

01011ST IF

8110

*+22VCpl.01SOT

cx+

`4?' 71,4? 10104I 41.

1.0

0104390

4111270

CIO*

.0500111

C107040

6 0%

2122 01064.26 OF AEC

T.P.-sac

n::n:

+22V

F1011AROML

11301300

dc"°77Lr _ _ -3/4L

4/L.2 at /1.)

0100.001

+22V* nx

03040011

V0 LYME

IC3081.11.

03051004

1 IC302 -C-41.211.

.04 511''0304

4".02

C30/EN. 5

IC 01A ;7161

10

C300-- 03011120T1041

25V

L

II1STA VI. COT

,WiMO VOW TINE

0(400

L- -

VMDIAL

AUDIO MODULE

1;101507

10401

04.3/116

01174.

+22V

01022101, R.

I1.2K

CII3.001

TSO

SYMBOL DESCRIPTION

R139-control.IF AGC, 2.5KR147-control-RF AGC, 2.5K

tripleR210 -85K. heightR215 -16K, vert sizeR218 -2K, vert lin

GENERAL ELECTRIC PART NO.

ES49X60ES49X60ES49X61

R232 -therm assembly ES41X5R233 -therm, 6500, 10% ES14X27R307-VDR 1180-200v) ES13X3C403A-300 of, electro, 175v ES31X38C4038-30 Ad, electro, 150vC403C -300 of, electro, 150vC4031)-200 of. electro, 50v

r011111

0117 11.2 IC170 1/41.

CII4 -1- M4-12..001'

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011/171c,g cr.;

82

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T9g.

O 14082

1114

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+130V

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lig!!1.5301

+22VSOURCE

+130VSOURCE

+140VSOURCE

1172120

01142.211

IRMO1.111

60 +22V

11044144.

+140V01E1 .3.0111/4111 INWVA% NM%

7.R

0104 vir loxFOL130vIDEO C125

L102 -coi1.41.25MHz trap ES36X83L103-coi1-47.25MHz trap EP36X13L106-cod-44MHz trap ES36X84L108 -coil -sound take off ES36X86L109 -coiI.4.5MHz trap ES36X87L251-coil-horiz osc ES36X88

deflection yoke ES76X67101 -video detector xformer ES57X67201 vert output xformer ES64X 117251-hora buffer 'dormer ES64X 127252 horiz output xformer ES77X 12

T301 -audio output 'dormer ES64X13T401 -CRT filament xformer ES64 X10

fuse 4a, fast blow, pigtail, 250v, (F4011 EP1OX52

L 106 cm C122"..-61.11 110 II

I RIM 6116390 420IF.

+22VT. P.rIF AGC

11143470 V103vn

C131. C132

\or0061'N'Vls P4 I ;IX. TERM

I I

+22V

Mr .8S11

020170

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ON.K

Cl..OE

0253 CUM271 .005

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220

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0100.4.14607

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112011

JL1094,9610,

5123100

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+22V

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A205 0207470 10K

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0252MOR BUFFER

ROR1/.2.9.7 T

-L0.

C;20091: /1 if,51SOLO* 5 %

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330

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_E.-. 0105710E0ATM

boor£612310.8.35%

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oil

ELECTRONIC TECHNICIAN/DEALER is pub-lished monthly by HARCOURT BRACE JO-VANOVICH PUBLICATIONS, INC., 1 East FirstSt., Duluth, Minn. 55802. Subscription rates:One year $6, two years $10, three years $13,in the United States and Canada. Other coun-tries: One year $15, two years $24, threeyears $30. Single copies 750 in the UnitedStates, and $2 in other countries. Secondclass postage paid at Dansville, New Yorkand at additional mailing offices. Copyright1972 by HARCOURT BRACE JOVANOVICHPUBLICATIONS, INC.POSTMASTER: Send Form 3579 to ELEC-TRONIC TECHNICIAN/DEALER, HARCOURTBRACE JOVANOVICH PUBLICATIONS, INC.,1 East First St., Duluth, Minn. 55802.

+140v

1.411v

LIST 013322066 IN

+1401/ N.AI302206171.04 r NESS

7002 7252TEEM

022.

R1.36

C'21441- 1111

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0205VERT OUT

RIX0232

C)I6233

022934

10K

+130V

IMO711tW

TO CRTi6

Call.0033

C212.22

6007

WIDTHADJuST

F0051264

AL,10V

+130V

COPYRIGHT 1972 BY ELECTRONIC TECHNICIAN/DEALER I EAST FIRST STREET. DULUTH, MINNESOTA 55802

1-a_

fuNDNODULE

= - -c..0T

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C103

L_ _, .001

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B LUE.

PIM420

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E -T, 11 - Jr.-.. r BLUEVIDEO

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HZ 5E -w.5%itt

25,4 C....00.457_52.

OUTPUTOUTPU CESS

VOR.12-117,-.1--0--. 2700 iAi - .1

512 R2l92702/

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MECHANICALLY

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21-2222 TRANSISTORS may INREPLACED M 41.226

'Sr' 0211 DR 121.721

121-743**as.5 .50

GREEN VIDEOs% ' OUTPUT

voe"Ott

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--> Ai F MI:KATES PIN NUMBER ON MODULE BOARD

OWN

TEST POINTS

11T -PASS WITH 470PF DURING 4THI.F. ALIGNMENT.

PICTURE OETECTOP OUTPUT

CCI BIAS PONT POP CI ADJUST

C2 SOuNO DETECTOR OUTPUT

C) SYNC DETECTOR OUTPUT

II1T-PASS WITH SS pf 292/ ELECTRO-LYTIC DURING COLOR ALMON/ENT

I.F. .43 C.INPUT TEST POINT FOR 4ThALIGNMENT

A.0 C.

KK

TURN COLON THRESHOLD CONTROLTO MAX. CLOCKWISE POSITION TOOPEN COLOR CHANNEL

SOUND OUTPUT

0 A C C VOLTAGE

RED COLOR AMP. COLLECTOR

SLUE COLOR AMP COLLECTOR

RR

oto

GREEN COLOR AMP COLLECTOR

ISIWOHNIESS LIMITER SET-UPPOINTS

C

NOTES

PHOTOGRAPHS TAKEN ON A STANDARD GATED R441104 COLOR RAN SNINALTHE HUE SETTING ADJUSTED PON PROPER COLOR. THE wave SHAPES ATTHE RED,GREEN ANO GLUE CATHODES Of THE PICTURE TUBE DEPEND ONTHE HUE. COLOR LEVEL !CITRON LEVEL CONTRAST ;COLOR CENNANDERIAND PICTURE PEAKMG CONTROLS.

FOR wAvEFORIAS 43 THRU 49. TEST POINT -O-MAST GE Br -PASSED WITHA 01 NED CAPACITOR

ALL VOLTAGES MEASURED PROM CHASSIS TO POINTS INDICATED.

ALL VOLTAGES ARE D.C.UNLESS moms' SPECIFIED.

ALL DC VOLTAGES TO GE MEASURED WITH A VACUUM Tun VOLTMETERH AVING II MENOHla INPUT RESISTANCE.

ALL VOLTAGE MEASUREMENTS TO RE MADE WITH ND SIGNAL PRESENT ANDNORMAL SETTING Of CONTROLS AND CHANNEL SELECTOR SET TO CH2 UNLESS OTHERWISE SPECIFIED

RESISTANCE MEASUREMENTS SHOWN WITH COILS DISCONNECTEDFROM CIRCUIT

ALL RESISTORS ARE 010% TOLERANCE. CANDOR. 1/2 WATTOTHERWISE SPECIFIED

COR. RESISTANCE NOT OVEN UNDER CNC Com

ALL CAPACITOR 'ALLIES IN MICROFARADS UNLESS OTHERWISE SPECIFIED

FOR CAPACITOR TOLERANCE.SEE LEGEND.

CATHODE RAT TUBE END ANODE VOLTAGE TO BE MEASURED KITHELECTROSTATIC OR 20K OHMS PER VOLT INN NIGH VOLTAGE NETER.

ARROWS ON POTENTIOMETERS INDICATE CLOCKWISE ROTATION

0 NOICATES ALIGNMENT AND TEST POINT

pF piC0FARAD IN, MEGAHERTZ 81 MICIICHIENNT

P INMATES ±20% NAT RE USED 0- INDICATES VOLTAGE SOURCE.

OOKATES WAVEFORM CHECK POINTS. (SEE WAVEFORM CHART)- INDICATES CHASSIS GROOM

- - INDICATES MODULE BOARD

SECONDARY CONTROL 15.00(LEAD ENO vqI

COMVSOL

C 001022MYER

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ZENITHColor TV Chassis19CC19

SYMBOL DESCRIPTION ZENITH PART NO.

22-6071

635440638492

R244-3000 peak picture control 6666 349 6897 591

841

R248 3.5M vert size controlR258 -750K vert hold control

666333989684529937R259 -1K vert lin controlR306 -ton vert cent control 2W 63.7009R308 -7n horiz center control 6

333

48

468897

41R309 -10K killer threshold controlR333 -voltage dependent resistor 5%R338 -50n bright limit control 63.8989R344-thermistorR1013 -20K ACC control 6633:88685767

R1016 -20K APC control 63-8576L102-39.75MHz & 47.25MHz traps 20-3396L113-4.5MHz trap 20-3289

LL220903=dheolraizy

linecoilone

S-85998

L901 -chrome take -off coilL902 2nd chrome coil SSS.:885.561096771

T201 -sound output xformer 95-2854T202 -Vert output xformer 95-2850T203 -saturable reactor 286T204 -power xformer 995529127T205-horiz sweep xformer S-861597206 -deflection yoke 95-2638T207 -ac line choke 95-2920T1102-4.5MHz input coil W 9 5-

26

art of 150-2081A201 -integrator unit

1 3 870 72 06

-4

F201 2.7a bel-fuseF202 -heater fuse link 91-2061F203 -.5a bel-fuse 136-84F204 -.5a slow blow fuse 136-89

C243A-30 of electro cap 350vC24313-500 pf electro cap 35vC243C-500 electro cap 50vC276A-80 of electro cap 350vC2768-80 electro cap 350v 22.6073C276C-15 uf electro 350vR204 -voltage dependent resistorR212 -5K AGC level ControlR219 -10K AGC delay controlR230 -contrast controlR238-5000 bright control

0

cc

i I 2'

.0

COPYRIGHT 19721972 BY ELECTRONIC TECHNICIAN/DEALER 1 EAST FIRST STREET. DULUTH. MINNESOTA 55802

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JANUARY 1972, ELECTRONIC TECHNICIAN/DEALER 119

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20 I ELECTRONIC TECHNICIAN/DEALER, JANUARY 1972

PHILLIP DAHLENEditor1 East First StreetDuluth, Minn. 55802(218) 727-8511

ALFRED A. MENEGUSPublisher757 Third AvenueNew York, N.Y. 10017(212) 572-4829

TOM GRENEYPublishing DirectorJOSEPH ZAUHARManaging EditorBERNICE GEISERTAssociate EditorGAYNELLE DAVIDSONProduction ManagerBOB ANDRESENGraphic DesignLILLIE PEARSONCirculation FulfillmentJOHN KESSLERManager, Reader Services

MANAGERS

DEAN GREENER43 East Ohio StreetChicago, Ill. 60611(312) 467-0670

CHUCK CUMMINGSAd Space South/West613 North O'ConnorIrving, Texas 75060(214) 253-8678

KEN JORDANDONALD D. HOUSTON1901 West 8th StreetLos Angeles, Calif. 90057(213) 483-8530

CHARLES S. HARRISONCY JOBSON57 Post StreetSan Francisco, Calif. 94104(415) 392-6794

ROBERT UPTONTokyo, JapanC.P.O., Box 1717

ELECTRONICTECHNICIAN/DEALER

JANUARY 1972 VOLUME 94 NUMBER 1

The advent of space travel and solid-state electronics has done much to shrink ourplanet. Photo courtesy of GTE Sylvania ECG Replacement Semiconductors.

3 TEKFAX: Up-to-date schematics for easier servicing.23 EDITORIAL: Why Modular TV Circuits?

24 LETTERS: Pertinent comments concerning past issues.

30 READER'S AID: What you need or have for sale.

31 NEWS: Events of interest to our industry.32 NEW AND NOTEWORTHY: Merchandise of special interest.

FEATURES

39 TEKLAB REPORTThe first of a two-part description of what was encountered in our lab when exam-ining Motorola's Model TU945HS color -TV set-by Joseph Zauhar.

43

46

48

51

WORKING WITH COMMERCIAL -AUDIO EQUIPMENTJack Hobbs, former managing editor of ou- publication, begins a series of articleswritten to improve your revenue through effective commercial audio work.

SERVICING WITH A COLOR -TV TEST JIGExperiences in our lab with TeleMatic's Model E.1190 19 -in. color -TV test jig-by Joseph Zauhar.

DIAGNOSING POWER SUPPLY CIRCUITSMelvin Netherly tells how many seemingly unrelated TV -set symptoms can be tracedback to a defective power supply.

GUEST AUTHOR: RECEIVING TUBES TAKE A LOOK AT SOLID-STATEMorris Lewis, manager of RCA Distributor Receiving and Picture Tube Merchandising,predicts that although many tube -type TV sets will continue to be sold in the future,solid-state circuitry is certainly gaining in popularity.

52 TEST INSTRUMENT REPORTReviewing specifications for California Instruments' Model 8420 Digital Multimeter/Counter.

56 TECHNICAL DIGEST: Hints and shortcuts for more effective servicing.57 COLORFAX: Tips for easier color -TV set repair.

60 NEW PRODUCTS: Instruments and components to make your job easier.64 DEALER SHOWCASE: These items may increase your sales revenue.

66 TECHNICAL LITERATURE: Informative material that you may need.68 ADVERTISER'S INDEX: Manufacturers concerned about you.69 READER SERVICE: A source of additional information.

AP -

A HARCOURT BRACE JOVANOVICH PUBLICATION IV

HARCOURT BRACE JOVANOVICH PUBLICATICNS: James Milholland, Jr., Chairman; Robert L. Edgell,President; Lars Fladmark, Senior Vice President; Richard Moeller, Treasurer; John G. Reynolds,Vice President; Thomas Greney, Vice President; Ez a Pincus, Vice President; Bruce B. Howat, VicePresident; James Gherna, Vice President.

ELECTRONIC TECHNICIAN/DEALER is published morthly by Harcourt Brace Jovanovich Publications.Ccrporate Offices: 757 Third Avenue, New York, New York 10017. Advertising Offices: 43 EastOhio Street, Chicago, Illinois 60611 and 757 Third Avenue, New York, New York 10017. Editorial,Accounting, Ad Production and Circulation Offices 1 East First Street, Duluth, Minnesota 55802.Subscription rates: One year $6, two years $10, three years $13, in the United States and Canada.Other countries: one year $15, two years $24, three years $30. Single copies: 75C in the U.S.and Canada; all other countries $2. Second class postage paid at Dansville, New York 14437.Copyright ,J 1972 by Harcourt Brace Jovanovich, Inc.POSTMASTER: Send form 3579 to ELECTRONIC TECHNICIAN/DEALER, P. O. Box 6016, Duluth,Minnesota 55802.

JANUARY 1972, ELECTRONIC TECHNICIAN/DEALER 21

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EDITORIAL

Why Modular TV Circuits?Two letters inthis month's Let-ters to the Edi-tor Column re-flect a concernheld by manytechniciansfrightened by theincreased popu-larity of modu-larly designedTV sets. They

fear that the increased use of plug-incircuits will either make servicing soeasy that the public will do its ownservicing-leaving the technician withouta job-or that these circuits will makeservicing so difficult that they will beunable to handle the job-forcing themout of business.

Several years ago I personally purchasedone of the very first Motorola Quasarcolor -TV sets produced. This TV set hadoriginally been obtained for our TeklabReport (September 1967, page 43;November 1967, page 49). Being anearly model, it had no AFC tuner orregulated ac power supply. This earlierdesign even required the use of a high -voltage rectifier tube. But, I was pleasedwith the TV set-it worked well andproduced an extremely good color -TVpicture.

By now nearly everyone knows that, liketubes, with time transistors can requirereplacement. And I have serviced morethan one of these plug-in modules,replacing a defective transistor witheither a universal replacement or aspare that I pulled from some unusedcircuit board. I have found that in -circuittransistor testers work well on theseboards, that these boards can be madeto function outside the TV set, and thatit is much easier to solder a modulethat has been removed from the chassisthan it is to attempt to work deepwithin a chassis.

I have more frequently used anothertechnique when working on my TV set-complete module replacement. Motorolahas a module exchange program,replacing defective modules withupdated ones for but a small fee.

It is hard to believe how flexible thedesign of a TV set can be when it is ofmodular construction. Being anindividual who enjoys playing withcircuits just to see what can be done, Ireplaced my VHF tuner and the IF module-substituting Motorola updatedversions that gave my TV set AFCcapability. (This was the only circuitchange that required any mechanicalmodifications. Since I wanted todeactivate the AFC whenever fine tuningthe set, and there was no AFC defeatswitch on the front panel, I glued apermanent magnet to the tuner gearassembly. When the fine-tuning gearsengage, the magnet activates a G CCalectro proximity reed switch, shortingout the AFC. This technique is fullyautomatic and works fine-no manualswitch being required.)

Although the high -voltage supply workedfine, I wanted to have the TV set containentirely solid-state circuitry (except forthe picture tube-and someday maybeeven that will go). Soon after Motorola'ssolid-state, high -voltage rectifier wasdeveloped, I substituted a new modulecontaining it. No schematic wasrequired for this modification, the newmodule fit fine, chassis connector wiringwas the same, and I am now able to geta picture the moment I press the powerswitch.

The next major development was a newregulated ac power supply. The older oneworked fine, but these modificationswere fun to make and improved thedesign of the TV set. The "works in thedrawer" were plugged into the newsupply the same as before-although adifferent degaussing coil was required.

As you can see, Motorola has mademany improvements in the design oftheir original Quasar color -TV set. If I

had waited until all of these improve-ments had been made before purchasingmy TV set, I would not have been ableto start enjoying the high -qualityreception that it provided until this pastyear-rather than four years ago.

Owning this TV set has proven to be aneducational experience. It has shown me

that a modular design can permit greaterserviceability and easier upgrading thanany other type of chassis design. It hasalso helped me increase my under-standing of solid-state color -TV circuitry.

Each TV set described in our TeklabReport has actually been examined herein the ELECTRONIC TECHNICIAN/DEALER

lab. We have personally examined theHeathkit Model GR-270 (December 1970,page 31), RCA's Argosy (January 1971,page 33; February 1971, page 33),Zeniths Titan 110 (September 1971,page 35; October 1971, page 41) andMotorola's second generation Quasar(this aid our next issue). All of thesecolor -1V sets are of modular design,using virtually solid-state circuitry.Including this last TV set, which justleft our lab, we personally know theowners of each of these TV sets. And ifany of these TV sets do require servicing(many of them haven't), this is done byJoe Zauhar, our Managing Editor.

From such first-hand experience, we canconclude that these color -TV sets containsignal and bias feedback circuits whichfunction well in compensating fortemperature changes and componentaging. And the modular, solid-stateconstruction of color -TV sets is becomingincreasingly popular (no criticism beingintended against color -TV tube circuitry-we also know the owners of most ofthe other color -TV sets that have beencovered in our Teklab Reports, and theyalso have excellent service records).

The modular, solid-state, color -TV setsthat we have had in our lab are definitelynot designed for consumer maintenance.They are instead designed to makeservicing easier for the electronictechnicians that are working hard tokeep up with technological advances.Manufacturers can no more afford togive you color -TV sets as instructionalaids than they can us editors. But witha lot of hard work and study, we canmaintain our technical competency.

JANUARY 1972, ELECTRONIC TECHNICIAN/DEALER 123

LETTERSReader comments concerning pastfeature articles, Editor's Memos, previousreader responses or other subjects ofinterest to the industry.

New York Consumer LegislationCan you hear it? Maybe you can,

but for those who may not, let me ex-plain the sound.

It's the sound of changing times. It'sa wave-maybe a little larger than theothers.

This wave is being caused by irre-sponsible accusations that are directlyaffecting the consumer electronic re-pair industry.

According to an article in the NEWYORK TIMES, Harry Smith, the assis-tant district attorney of Queens, incharge of consumer frauds, declared,"We're not talking about an occasion-al bad apple. The whole barrel stinks."

How about that; I'm rotten-anddidn't even know it! All those TV ser-vice technicians that I thought weregood guys, are all bad guys.

This name calling is designed to castdoubt on the professionalism of thewhole repair industry in order that cer-tain individuals can more quickly cre-ate a situation whereby the consumerwill think he is being protected regard-less of what type of legislation ispushed through.

It seems to be that the method andend result could be disastrous and un-fair for both the consumer and the ser-vice technician.

The bill, No. 5582, the one gettingits push by the tactics mentionedabove, and the same one that PhillipDahlen wrote about in the editor'smemo in the November 1971 issue,was opposed by TSA. Many of usclosed our shops in order to be presentat the November 16, 1971 hearing inAlbany, N.Y. TSA, rather than justcoming out in total opposition to Bill5582, injected in its statement [printedat the conclusion of ,this letter], pre-pared by an attorney, constructive crit-icism of the bill and also offered assis-tance by the association. TSA is onlyopposed to this bill alone, not onewhich carries with it proper provisionsfor regulation.

It is interesting to note that TSA'shearing statement made no referenceto the rest of the mud-slingers, whomust justify their existence by spread-ing false rumors. The point in questionconcerned the bill, and that is whatTSA concerned itself with.

Regardless of the outcome of thebill, there will be plenty of work forTSA.

So, technicians in New York Statecan hear the wave. If the wave isheading in your direction, try to beon top of it, not under it.

JOHN W. KOZUBAL, OWNER -MANAGERTV CLINIC

Statement ofTelevision Service Association,Inc. of Northeastern New York

Presented to theJoint Legislative Committee

on Consumer ProtectionMr. Chairman, committee members,

and interested parties. My name isWilliam M. McCarthy, counsel to theTelevision Service Association, Inc. ofNortheastern New York. Today wecome before you to voice the positionof the Television Service Associationon the registration of television repairshops when taken in conjunction withthe idea of consumer protection.

Perhaps it would be appropriate tofamiliarize you with our organizationwhich was formed in 1953. The mem-bers of the group are qualified andcompetent technicians who strive toserve the public in an honest andforthright manner. These members en-deavor to serve the public according toits needs. Members attempt to performsatisfactory work on electronic equip-ment in consideration for a fair andreasonable fee. The prices charged byour members are geared to allow themembers to cover the cost of operationand to receive a fair and equitable re-turn on their investment.

In order to gain the consumer's con-fidence and to maintain a high level ofcompetence, our members have partic-ipated in certain activities. In order tobetter understand and service con-sumer appliances, our member techni-cians have attended accredited learninginstitutions. Our people are constantlyattending instructional seminars spon-sored by the industry and by manufac-turers to remain abreast of complex in-novations of the said industry.

Let us ask why Television ServiceAssociation members, who are estab-lished businessmen, would attend suchseminars. The answer is simply that toserve the consumer public, membersmust fully know and understand suchhighly sophisticated electronic servic-ing aids as oscilloscopes, generators,and sweep alignment equipment, tomention only a few. Naturally, theconsumer benefits because servicingtime is minimized and, consequently,the customer's out-of-pocket expense isless. It might also be noted that somecustomers' satisfaction or happiness isdirectly proportional to the amount oftime a technician has a machine in hisshop.

Our membership consists of honestand decent men who have voluntarilyattempted to control and regulate theirown industry in this upstate geographi-cal area. The very purpose for the for-mation of this association was for theprotection of the consumer and thepublic image of the service technician.However, we would be remiss at thistime if we did not recognize that thereare some not -so -honest, not -so -desir-able and not -so -competent men in thisindustry. The aforementioned peoplewho make up a small percentage ofthe technical force are the culprits whocreate public distrust of the competentand very able industry personnel.Thus, because of the current state ofaffairs, created, we believe, by a smallgroup of incompetents, legislation inthe area of consumer protection is acurrent issue.

It is our understanding that the hon-orable chairman of the committeesponsored a bill in the assembly toamend the general business law. It isour further understanding that SenatorGiofire introduced an identical or sim-ilar bill in the senate which providesfor the registration of electronic repairdealers. However, we must point outthat the Television Service Associationmembership feels that the compositionof the aforementioned bills as intro-duced last session is completely inade-quate to regulate the television repairindustry or the broader electronic re-pair industry. Let us not be misunder-stood in this opposition. Our associa-tion is united and feels there should besome form of regulation or licensing.Through such regulation, it is our wishthat the incompetents and dishonestparties would be rendered inoperativeand be removed from the industry. Anacceptable law would elevate the pro-fessional technician to such a level thatthe non -desirable service repairmancould not be compared to them at anytime.

At this time we do not propose topresent a new or alternative law. Wewould merely like to take this oppor-tunity to make several constructivesuggestions based upon the bill intro-duced during the last legislative ses-sion:1. There is a lack of provisions for de-termining a technical level of compe-tence.2. There is an apparent dearth or lackof administrative machinery for regis-tration or revocation hearings.3. There is little or no assurance thatthe secretary of state would appoint anindustry representative as bureau chief.4. The advisory board would havevery little voice in administration ofthe area of governmental operation.

continued on page 26

24 I ELECTRONIC TECHNICIAN/DEALER, JANUARY 1972

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reference manual that matches the rightadaptors to the right set. Order the adaptorsyou need, and keep ordering others as youneed them. After your Distributor registersyour purchase of the test jig, you will receiveyour copy of the manual, and periodic mailingsof new inserts to keep the manual up to date.

If color TV servicing is your business,RCA's ICTJ belongs on your bench.

Talk to your RCA Paris and AccessoriesDistributor today for full information.

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Parts andAccessories

LETTERS . -continued from page 24

5. There is a lack of definitive termsvis a vis good moral character. Gentle-men, we submit that the courts of NewYork State have been attempting to de-fine this term for years.

Let us further inquire into anotherterm. Who is a potentially dangerousperson? The bill leads us to believethat a summary investigation will beutilized to define these awesome terms.But nowhere does the bill specificallydefine what a summary investigationis. It is interesting to note that the sec-retary shall investigate only after theaccused registrant has had a reason-able opportunity to reply. Said term isreally not specific enough to advise anaccused of anything. Therefore, hon-orable chairman and committee mem-bers, it becomes apparent that once adiscerning eye is cast upon specifics inthe bill, it becomes a maze of hazyterms and unclear words. The bill ob-viously cannot fulfill the job for whichit was created.

Nevertheless, we would like thiscommittee to be cognizant of the factthat our association stands ready to ad-vise and assist any interested legislatorin the preparation of a regulatory bill.In the past we have participated inconsumer seminars in cooperation withlocal legislators. We have also estab-lished information services at homeshows in an effort to alert the public toour desire for high standards and lev-els of performance. In an effort to reg-ulate our own industry on a local level,we have cooperated with the AlbanyChamber of Commerce in answeringvalid public complaints. The state's at-torney general has also received ourcooperation on all requested matters.And, finally, in the past we have co-operated to our fullest extent with anypublic-service or community -mindedgroup to develop an understanding ofthis tremendously complicated indus-try. In closing, we would like to offerour professional assistance to you atany time and to thank you for this op-portunity to address this committee to-day and to express our views as a rea-sonable service -minded organization.

Thank you. Good morning.TELEVISION SERVICE ASSOCIATION, INC.

Manufacturer Help WantedHaving operated an independent

radio/television service shop for over20 years, and having attempted tokeep it as up-to-date as I could afford,with the best instruments that I couldafford, and keeping myself well readand ahead of the new developments, I

have some questions, facts andthoughts to offer.

I have read in ELECTRONIC TECH-NICIAN/DEALER about the new modu-lar transistorized TV sets being offeredby several manufacturers for the 1972season. While modular construction isnot new, having been used in com-mercial equipment for years, it is newin its miniature form-using integrat-ed circuits and micro -sized transistors.

I note that some of these circuitsare very closely tuned, the frequenciesand voltage waveforms being critical.Since transistors change with use, heatand voltage operating changes, severalof these circuits will become out of ad-justment at best and inoperative atworse, after just a few short monthsof use.

With some consumer groups cryingfor reform in the service industry, it isa poor time for manufacturers to startexperimenting with the public. Whilesome complaints against the serviceindustry are justified, the main reasonfor slow service has been poor designand the inavailability of replacementparts. At the present time there arehundreds of tubes, transformers andphono parts listed. And for economicreasons, few if any distributors carryall of them in stock.

Are we to expect the same jungle ofparts as these new advances in elec-tronics come out? Will these boards beavailable? Will they be easy to removeand accessible?

Now is the time for manufacturersto wake up to these problems-beforethis new generation of products alsoreaches a confused state. Now is thetime to standardize parts, to come toan agreement on the location and lay-out of stages in TV sets-now beforeconfusion sets in. It is the independentservice dealer who must repair theseproducts, usually after three years ofuse, after all warranties have ended.

I am afraid that they will repeat thetypes of problems that once facedus with the advent of printed circuits-when these boards started to faildue to cracking, damage from heatedtubes, arcing and other failures. Wewere snowed under with a lot of non-sense about printed -circuit techniquesand reams of alignment instructions-instead of being aided in the repair ofthe burned wrecks on our workbenches. Already this year one manu-facturer has sent me literature on whatamounts to defects in his past sets.

I would suggest that each manufac-turer exhaustively test each productbefore he turns it loose on the public,and not expect the technician to finishthe job that he should have done.Each manufacturer should make avail-able to every qualified service shop aset of circuits in his new product, in-

structions, schematics and any otherhelpful information concerning them-free of charge-so that the menwho must repair them three yearsfrom now will be familiar with themand be able to service them quickly,thus preserving the manufacturer'sname.

Those who have kept abreast of thenew theory will have little difficultyunderstanding the new circuits. Butthe physical appearance, location ofboards and method of holding themwill no doubt differ from one set toanother, and these differences shouldbe made known.

Having a circuit to study with itsschematic and descriptive material inthe hands of each man who will workon it would save the industry themuch greater cost of a retraining pro-gram.

I would suggest in the Tekfax sche-matics (which I make great use of)that you print a layout of tube andpart locations-both top and bottomview-on all TV schematics instead ofjust some of them.

I think that others will agree thatthe few points I have made here arewell founded.

DAVID S. HYDEPlease refer to the answer given to

the following letter, which is con-cerned with basically the same prob-lem. My reply to that letter, plus thismonth's Editor's Memo, represent ourpublication's attitude toward this prob-lem. Ed.

Fears 'Do -It -Yourself' RepairI was reading last night's paper and

I noticed a big article about RCA'snew module set. The article went onto say how the consumer will be ableto go into the back of his set andchange these modules without, "hav-ing an expensive technician service hisset." It also told how this set will bedesigned to last 10 years.

I am in the service business, andmy partner and I are licensed tech-nicians. We pay for a new license ev-ery year. Just where does this leavethe future of television repair? Is thegreat RCA trying to do away with theservice man? Please answer this letterif you can.

G. A. SUFFRINAfter receiving this letter, I wrote

Mr. Suffrin and he was kind enoughto supply me with a copy of the orig-inal newspaper article. The article, byJohn Pinkerman of the Copley NewsService, seemed to be an imaginativedescription of RCA's Argosy Chassis,described in detail in our January andFebruary issues.

Having personally examined thiscontinued on page 28

26 ! ELECTRONIC TECHNICIAN/DEALER, JANUARY 1972

Now Ford gives you a choiceof swinging or sliding doors.

Only Ford vans have so many betterideas that make vans easier to drive,to service, to use.

New Econoline Vans now offer you achoice ofconven-tionalswingingdoors or anew glidingside door for cargo handling incramped alleys and beside loadingdocks. Three separate tracks, at top,bottom and center, give bridge -likesupport for solid, smooth, one -hand operation, tight seal.

Shorter outside, easier to park. Com-pared to other makes with similarloadspace, Econoline Vans have sig-nificantly less overall length. Thismeans easier parking and bettermaneuverability in city -delivery oper-ations-time saved on every trip.

Easy, out -front servic-ing. Routine service

points are right athand under hood:water, oil, battery,

wiper motor, voltageregulator, plus many

others.

Strong, Twin -I -Beam IndependentFront Suspension-Ford's exclusivedesign smooths the going for bothload and driver. Twoforged steel I-beamaxles providestrergth and dura-bility; wide wheel stance means sta-bility in cross winds.

Wider at top for built-ins. Body sidesare more vertical, wider apart at topthan other vans. Built-in units fit bet-ter and leave more aisle.

Biggest payload. E-300 Series hauls... for more details circle 113 on Reader Service Card

Sales leader for 11 straight years.

over two tons of payload; 4,285-lbs.to be exact-biggest of any van.Engine clear forward. In Ford's clear-deck design, en-gine is forward-all the way out ofcargo area. Over

FORD'CUM nex:r81/2 ft. clear floor oesmi

space behinddriver's seat . . .

over 10 ft. in theSuperVan. Driver can easilyfrom seat into rear cargo area.

U

step

FORDECONOLINE

VANS

JANUARY 1972, ELECTRONIC TECHNICIAN/DEALER 27

gill

New Heathkitvalue leaders

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New Heathkit Digital Multimeter...lab precision for only 229.95*

Measures AC and DC voltage, current, and resistance, with automatic switch-ing for DC polarity. Five overlapping ranges show voltage from 100uV to 1000Von DC; 5 ranges cover 100uV to 500V on AC; 10 ranges measure 100nA to 2A,AC or DC; 6 resistance ranges cover 0.1 ohm to 20 megohms. Input impedanceis 1,000 megohms on the 2V range, 10 megohms on higher ranges, with over-load protection on all. 31/2 digits for 100uV resolution on 200mV range, 1V on1000V. Automatic decimal point. Panel light indicates over -range. DC cali-brator, furnished assembled, and unique transfer method allow calibration to0.2%. Unit can be lab calibrated to 0.1%. Kit includes standard banana jackconnectors complete with test leads. Assembles in approximately 15 hours.For lab spec performance on a budget...order your IM -102 today!Kit IM -102, 9 lbs. 229.95*Kit ID -1041, high -voltage probe accessory, 1 lb. 6 95*

New Heathkit Dual Trace Scope...DC-15MHz for just 399.95*

Offers triggered sweep, DC-15MHz, x -y mode, on an 8 x 10cm flat -faced CRT...all for a price as low as many single trace instruments. Display separate sig-nal in Channel 1 or Channel 2 mode, compare both signals in alternate orchopped modes, or both signals as a function of each other in x -y. Both inputchannels precision balanced for 5° or less phase shift to over 50kHz. Switchselected AC/DC coupling; automatic triggering; 18 -position time base, 1, 2, 5from 100msec/cm to 0.2us/cm; separate vernier control; 5x magnifier; DC-15MHz bandwidth with 24nsec rise time; flat -face CRT with mu -metal shield.Assembly time approximately 26 hours. Expand your analysis capability with-out stretching your budget...order your 10-105 now!Kit 10-105, 35 lbs. 399.95*

Free -Your 1972Heathkit Catalog withthe world's largestselection ofinstrument kits.

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LETTERS ...continued from page 26

TV set while it was in the ELECTRONICTECHNICIAN/ DEALER lab, 1 can hon-estly say that the average customerwill be unable to repair it. Why? Be-cause he isn't adequately trained toknow how these modules function.How is he going to test the module?And who is going to loan him a spareso that he might attempt a substitu-tion?

No, this chassis is not designed toease your customer's job, it is designedto ease your job. Like a number ofother progressive TV set manufactur-ers, RCA has gone to considerable ex-pense to eliminate some of the fearsdescribed in the previous letter. TV -setmanufacturers found too many elec-tronic technicians lacking the neces-sary skills to maintain solid-state cir-cuits. They therefore decided to makethe job easier for the technician.

Yes We Must Eat!The letter, "Technicians Must Eat

Too," is beautifully done and hits thenail right on the head.

I agree. How else can the electronictechnicians establish a wage per hourif they don't get together and union-ize?

What good is your seniority, if thefeedback from your boss is; "Any timeI can get someone just like you to doyour work for less pay, then I'll fireyou and hire him. Why bother to trainthe senior men on new products if ayounger man will cost less per hour totrain? Seniority and 150 might get youa cup of coffee-if they are selling itat 150."

I keep on admiring the electricaltrade. If you enter a wholesale shop inour area, you can't even make a pur-chase without an electrician's license.Within a year or two, their pay willbetter than double mine.

Name of CET withheldupon request

NOT

"Oh, good, it has stopped raining,-goodbye,and thanks for the demonstration!"

. . . for more details circle 115 on Reader Service Card

28 I ELECTRONIC TECHNICIAN/DEALER, JANUARY 1972

When you're in a hurry, it's nice to know GTE Sylvania has the parts.

Only 34 tubes and ECG solid-state components willsolve practically all of your high -voltage rectifier re-placement problems.

And they're all available from your Sylvania dis-tributor.

Because tubes are tubes, we can't promise to reducethe number you'll have to carry. But, with the Sylvanialine, your distributor will have the tube you need whenyou need it.

In semiconductors, the story is different. Just 124ECG solid-state devices including transistors, diodesand integrated circuits will replace over 41,000 differ-

ent types. In the high -voltage section alone, only 8ECG rectifiers and triplers will take care of almostevery job.

And they save a lot of space in your tube caddy.When your distributor is stocked with Sylvania

receiving tubes and ECG semiconductors you'll havethe parts you need. And you'll get them fast.

It's like having a complete warehouse built intoyour telephone.

And that should help you make a fast getaway.

GTE SYLVANIAJANUARY 1912, ELECTRONIC TECHNICIAN, DEALER 29

TI140/111 Fi

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toolsmake tricky jobs easy

SUPER LONG NUTDRIVERS

Over 20" long with 1/4" and 5/6" hex open-ings, color -coded plastic (UL) handles, full lengthhollow shafts.

Eliminate skinned knuckles and the frustrationof trying to reach tuners, bezels, other up -frontcomponents from the back of a TV set withordinary tools.

Extra length means more convenience, greaterdriving power for many other "fix -it" jobs.

INVERTED PALNUT DRIVER SHANKSFit all Xcelite "99" handles, including Tee andratchet types. Popular 7/16" and 1/2" externalhex sizes, hollow shanks.

Save time, prevent damage to fastener orequipment when removing Pa!nuts on balancecontrols, on -off switches, volume control shaftsof most TV sets, record players, portable radios.

nationwide availability throughlocal distributors

REQUEST BULLETIN N470

XCELITE INC., 14 BANK ST.. ORCHARD PARK, N. Y.In Canada contact Charles W Poulton Ltd.

. . . for more details circle 130 on Reader Service Card

READERS' AIDSpace contributed to help serve thepersonal needs of you, our readers.

Instructions NeededI acquired a CRT Checker-Reac-

tivator tester with no instructions. Itis made by EBCO "Electronic BeamCorp." of Yonkers, N.Y. I would likea copy of the instructions and will paythe cost of copying and mailing.

JOHN J. FIORINO5 I 8-8 5 StreetBrooklyn, N.Y. 11209

Transformer Needed1 am in need of an audio output

transformer, part no. E8971, for aFleetwood Hi Fi, chassis no. 2072B.I will pay required price plus handlingand mailing cost.

ROGER HALL721 N. Gaffey PlaceSan Pedro, Calif. 90731

Tekfax RequestedI appreciate the Tekfax diagrams I

receive each month in my ELECTRON-IC TECHNICIAN/DEALER. I have themfrom 1229 of May, 1969 up to 1384,October, 1971. I would like to acquirethe Tekfax from 607 to 1228. Pleaseadvise availability and cost.

GEORGE E. BEAL, SR.Look & Listen T -V7115 N. 54th DriveGlendale, Ariz. 85301

Information RequestedCould anyone tell me who manufac-

tures a tube tester by the name ofE -T -A Model 1000/3000, Serial No.5110?

WILLIAM TURNER979 Arlington AvenueOakland, Calif. 94608

Information NeededI am having a problem finding in-

formation on a tape recorder andplayer. I need parts, schematics andname of service center for DokorderTape, manufactured by Denki OnkyoCo., Ltd., Series 7000, Serial no. 0576,Model 7010, DOK-207, Japan. Thistape was purchased overseas 5 or 6years ago and the instruction book,parts list and schematics were lost.

WALDON B. THIBODEAUX7 Putnam AvenueOrange, Texas 77630

For Sale

I have a Lampkin frequency meter,Model 105-B, and a Heath Audio gen-erator, Model IG-72, for sale.

DUANE WILSONRadio and T.V. ServiceRt. 2Guymon, Okla. 73942

Schematic Needed

I need a schematic for a SylvaniaTV, Model 17M191F3, Chassis 547-104-402-3190. I believe this datesback between 1960 and 1965. I willpay for any expenses if needed.

CLAUDE LEDUC137 Place GrassetVimont, Ville De LavalQuebec ProvinceCanada

I need a schematic and operatingmanual for a VOCA 101 meter madeby Demolab Corp., Los Angeles. I willgladly pay for expenses.

GARY L. MILLSWiley -Mills T.V. Services1511 7th St.Parkersburg, W. Va. 26101

I need schematics for the following:Knight 620-A voltmeter, and a Thor-dason Electric Mfg. Co. oscilloscopeType 11k16. I will pay for cost ofcopies.

A. A. Fooao670 Wilcox Rd.Rochester, Mich. 48063

Parts and Cements Needed

Does anyone know of a nationalfirm where I may order speaker partsand cements direct?

HENRY R. FOGGBox 153Morrisville, Vt. 05661

"At these prices, young man, I'll thank you toadmire yourself on your own time!"

30 I ELECTRONIC TECHNICIAN/ DEALER, JANUARY 1972

NEWS OF THE INDUSTRY

Electronic Industry CouncilDiscusses Mutual Problems

The fourth Electronics Industry Council meeting washeld on October 22nd in the Board Room of the HowardW. Sams Co. in Indianapolis, Ind. Morris L. Finneburgh,Sr., EHF, served as chairman; while Dick Glass, executivevice president of NEA, served as secretary. Although therewere 29 in attendance, all voting was restricted to partici-pating association representatives which included: TomSurber, Electronic Industries Assn. Distributor ProductsDiv.; Joe Groves, Electronic Industries Assn. ConsumerProducts Div. (not voting); John Leedom, National Elec-tronic Distributors Assn.; John Gooley, National Appli-ance -Radio -TV Dealers Assn.; Bob Flanders, Society ofBroadcast Engineers; Sid Sabel, National Electronic Asso-ciations; Bob Hallihan, National Association of Broadcast-ers; Ron Crow, International Society of Certified Electron-ics Technicians; and Frank Moch, National Alliance of Tel-evision Electronic Service Associations.

This photo of the Electronic Industry Council meeting was suppliedthrough the courtesy of Dick Glass, NEA.

Sid Sabel, TRIP chairman [project TRIP was describedon page 64 of our November issue] reported that this pro-gram has thus far received a very good response from allelements of the industry. He outlined a pilot program thatthe service association in Houston, Texas, undertook to at-tempt to involve all trade elements in that town. They wereimmediately able to interest all six TV stations, as well asdistributors and dealers. The copy content that the pilotprogram was suggesting to its area stations included: TVlead-in considerations (choice of lead in), new broadbandantennas, advantage of an outside antenna, a "snow free"picture, professional installation, choosing a TV system,outdated installations, and rotors.

Bob Hallihan outlined NAB plans concerning copy for10-, 20- and 30 -second spots to be put on by local stations.Presently the FCC reports that it will consider these spotsnon -paid commercials.

S. I. Neiman of the Electronics Information Bureaunoted that the major problem we have is that the servicetechnician is the scapegoat for bad reception problems andthis is the real reason that we must get down to businessand solve the reception problem. The public must knowthat they are only getting 30 to 40 percent of the TV sig-nal available. He also noted that the public understandsthat their auto will need sparkplugs and tires, etc. . . . be-cause they have been educated by the auto makers, etc. Weneed the same type of program to show that electronics

equipment also needs service and upkeep. The public doesnot understand us now.

Parts Availability Project chairman, Joe Groves, submit-ted a report based on 222 dealer responses which indicatedthat 11 had no parts availability problem; 48 complainedabout slowness; 12 had problems with 1969-71 model TVsets; 34 were concerned with electrical parts on 1966-68equipment; 21 responses concerned electrical problems on1960-66 equipment, I being concerned with appearanceproblems on this age equipment; and 71 responses weregeneral complaints.

During discussion, it was reported in the minutes that itis next to impossible for the independent technician to getparts from Sears, Wards, Western Auto Stores, WhiteStores, etc.

On the subject of FM interference, Bob Flanders notedthat some progress is being made. [One of his earlier re-ports was discussed at length on page 24 of our April is-sue.] The FCC has issued an inquiry to ask how to solvethe problem. It has asked for information concerning theamount and types of interference now causing problems.Findings nearly always show the receiver at fault, and theEIA has replied that it wants more time to study the prob-lem and make recommendations. The main problem forthe EIC to consider is that educational TV stations are notbeing allowed on the air because of interference-to a de-gree depriving the country of this media.

Tom Cooper reported that with the New Orleans jointconvention of NATESA, NEA, ISCET and ETA of Louisi-ana now definitely scheduled for August [August 9 through13, 1972 at the Jung Hotel in New Orleans, La.], prospectsfor further service association cooperation now look good.

John Gooley reported on plans for the next Nationalcontinued on page 33

WHY DOESN'T EVERY TV SHOP

DISPLAY THIS SIGN?

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Are YOU the operator of anethical, professional caliber tv-radio-home electronics servicebusiness?

Write for details on how you cangain great benefits and participatein the destinies of this greatindustry.

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. fo- more c etails circle 120 on Reader Service card

JANUARY 1972, ELECTRONIC TECHNICIAN/ DEALER 31

NEW AND NOTEWORTHYFor additional information on products described in this section, circlethe numbers on Reader Service Card. Requests will be handled promptly.

SECURITY ALARM 700

Designed for continuous use

The Spacemaster security alarm is designed for use with all rear loadingshowcases and can be quickly and easily installed without tools on slidingor hinged doors. Unlike some other devices, there is no shut-off switch,and the double circuitry combined with stand-by power supply providespositive, full-time protection. The anti -theft alarm is plugged into a110v ac outlet, which is not turned OFF when the store is closed-a heavy-duty long -life battery being supplied for use during a powerfailure. The alarm is said to be complete with a Master Unit andbattery, two floor mats, magnetic contacts for doors, contact cement,wire, wire -terminal connectors, and instructions for installing. The alarmsounds when the door is opened (unless sales person is standing oneither of the two floor mats) when wiring is cut or disconnected, whenthe power is disconnected or interrupted, or when any un-authorizedattempt is made to open showcase doors. Reflector Hardware Corp.

FOR MORE NEW PRODUCTSSEE PAGE 60

ANTENNA 701

Designed for fringearea reception

The "Ultron" series, all -channel TVantenna, Model No. 32-1204, isdesigned for fringe area reception.Construction design permits its satis-factory installation by customers whomight not be able to afford yourprofessional services, but prefer to dotheir business through you.Price: $24.95. GC Electronics.

SOLDERING IRON 702

Cordless, rechargeable

The ISO -TIP is a cordless, rechargeable, portable solderingiron designed for use on printed -circuit boards, normal

home and industry wiring repairs and hard to reach jobs.The tip performance is reportedly equivalent of up to

50w and up to 60 joints per charge depending on size ofwork. The unit has pushbutton operation with both pilot

and work lights. It reportedly reaches solderingtemperature in 5 sec, can be used with ordinary solder, and

has replaceable tips. This tool uses rechargeable, long -lifenickel cadmium batteries, has its own separate recharging

stand and recharges from dead to full charge overnight.Price $19.95. Wahl Clipper Corp.

32 ELECTRONIC TECHNICIAN DEALER, JANUARY 1972

NEWS."continued from page 31

Electronics Service Conference to be held at the ChicagoSheraton, Chicago, Ill., from 10:00 a.m. to 5:00 p.m. onSaturday, January 29, 1972. It will be sponsored byNARDA and subjects to be covered include: licensing, theuneasy band of warranty partners, the future of the servicetechnician, and a service technician protection plan.

Dick Glass will serve as chairman of the next EIC meet-ing to also be held at the Chicago Sheraton. This meetingis scheduled to begin at 10:00 a.m. on Friday, January 28,1972.

Both meetings precede the NARDA School of ServiceManagement, to be held from January 30, through Febru-ary 1, 1972.

Finney Financially Supports BothAssociation Membership Campaigns

During the past year ELECTRONIC TECHNICIAN/DEALERhas included many extensive news items, letters and Edi-tor's Memoes stressing the importance of joining the na-tional trade associations and benefiting from their insur-ance programs, training programs, government involve-ment and moral support. In fact, we believe so strongly inthese associations that we have even begun giving themfree ad space in our publication.

But, we must humbly admit that these efforts are smallas compared to the continued support given these associa-tions by The Finney Co. Although previously giving finan-cial support to the membership campaigns of both theNEA and NATESA, this year they are offering support un-heard of in the past-more support than any company hasoffered them in the past-a $59,500.000 program! [In fact,

the offer is so generousthat when Morris L. Fin-neburgh, Sr., EHF, chair-man of the board of TheFinney Co., first mulledthe idea over with youreditor during one of thenational association con-ventions last summer, Iconsidered it a beautifulidea, but of such magni-tude that it could never be-come a reality.] In thisprogram, the NEA andNATESA will distribute$35.00 wholesale mer-chandise certificates to thefirst 500 paid membersthat join the NEA orNATESA between Janu-

ary 1, 1972, and March 31, 1972 (1000 total new mem-bers). [It is our publication's belief that both associationswill go well over that figure in their membership drivesthis year-so join now to be certain that you are amongthe first 500!]

Morris L. Finneburgh, Sr., EHF,

The rules for this Finney Co. promotion are as follows:1. Membership drive: January 1, 1972 through March

31, 1972.2. All new members must be solicited, signed-up and ap-

proved by either NEA or NATESA ($35-first yeardues paid by new member).

3. For the first 500 new approved members (NEA orcontinued on page 54

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1

A THIRD EYETO SEE BEHIND

PIPES, PANELS, PARTS

Ullman all -angle Inspection Mirrors give youinside view of hidden areas on job

Double ball -joint lin-ts of tempered spring steel movefreely, swivel mirrors to 360° lock tight in desired po-sition. All handles bright chrome -plated. 3 pocket mo-dels with pocket clips; 3 models with telescopic han-dles that slide out to 15Y- maximum, with non -rotat-ing inner hex rods that prevent mirrors from swingingout of alignment in use.

Send for FREE catalog now. See full line of 54 fineUllman viewing, re:rieving and adjusting tools!

... for more details circle 128 on Reader Service Card

JANUARY 1972, ELECTRONIC TECHNICIAN/ DEALER 33

Reliable Electronic AssemblyProduction

Electric Motor Test & RepairPinpoint TV Troubles in 10

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Here is one of thoserare books which suc-cessfully bridges thegap between designand production technol-ogies, thereby provid-ing guidelines forchoosing the best de-sign to achieve theleast expensive andmost reliable product.The content providesinformation on mate-rial and methods em-ployed in mass produc-

tion, giving the designer in-depth knowledgeof the broad range of processes he should con-sider in evolving a final product concept. Notonly does the content define the best materialsfor each given application, and detail the bestchoice for fabricating but it also points outincompatibilities which may evolve betweendesign and production. 208 pages. Hardbound.

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TV, multiband radio receivers, hi-fi equipment,tape recorders, two-way communicationsequipment, and test instruments for servicingall this equipment. Yet this book does! By get-ting right to the subject of how to service theequipment without the usual wordy theoreticaldiscussions of how the circuits work. An all-inclusive servicing guidebook service techni-cians have been asking for. 256 pps., over 100illus., 6 big sections, 24 chapters.

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Industrial Electronics Made Easy

Here is a practicalguide to electronicprocessing and controlcircuits and systems,written especially forservice technicians. Itprovides technicalknowledge on the oper-ation and applicationof industrial process,control, recording, andmeasuring circuits anddevices. The authorcompares industrial cir-cuits with those used

in the more familiar commercial electronic andradio equipments. Early chapters provide anintroduction to applications of electronics inindustrial processing and control systems, en-compassing dielectric and induction heating,welding, ultrasonic devices, indicators, andrecorders, radiation detectors, transducers,counters, computers, CCTV. etc. Later chap-ters provide in-depth coverage of the circuitsand systems with emphasis on counting andlogic circuits. 288 pps., 239 illus. Hardbound.Ust Price 58.95 Order No, 99

A guide to maintenancepractices for all typesof small horsepowermotors. While many ofthe larger motor repairshops find it more ex-pedient to replace lowhorsepower units, re-winding of small elec-tric motors is still awide -spread and profit-able practice. This

Br practical guide containsa wealth of informa-tion on testing and re-

winding small motors of every type, includingfan, starter. polyphase, capacitor, induction,synchronous, etc. Early chapters tell you howto set up a motor test panel, make general testsand measurements, and advise you about thetools and equipment necessary (such as an ar-mature winder, wedge driver, cutting andgauging board, coil taper, puller plate, etc.).160 pps., 102 illus. Comb -bound with softcover.

List Price $6.95 Order No. 7-97

Electronic Circuit DesignHandbook

New Third Edition-Abrand-new, enlargededition of the ever pop-ular circuit designer's"cookbook," now con-taining over 600 provencircuits, for all types offunctions, selected fromthousands on the basisof originality and prac-tical application. Nowyou can have, at yourfingertips, this careful-ly -planned referencesource of tried and

tested circuits. Selected from thousands sub-mitted by distinguished engineers, these"thought -starters" are a collection of originalcircuits selected on the basis of their useful-ness. This detailed compilation of practical de-sign data is the answer to the need for an or-ganized gathering of proved circuits . . bothbasic and advanced designs that can easilyserve as stepping stones to almost any kindof circuit you might want to build. 384 pps..19 big sections, over 600 illus., 8%" x 11".List Price $17.95 Order No. T-101

Electronics Reference Databook

This new book is muchmore than a simple col-lection of tables, formu-las, graphs, equations.etc. In addition to theabundance of helpful in-formation given, it pro-vides specific guidancein the use of data. Nu-merous problems asso-ciated with every levelof interest-from elec-tronics theory (formu-las, laws) to measure-ments, tests, and circuit

design work-are covered. In so doing, the au-thor explains how to use the data (from this orother volumes) for purposes other than thoselisted. Covers Electronics Theory, Use of J Op-erator, Exponential and Other Tables. Attenua-tors and Equalizers, Filter Design, PracticalComponent Design and Application, Tube andSemiconductor Circuit Design and Operation.and Transmission Lines. 224 pps., over 100illus., plus 45 tables. Hardbound.

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A MAMMOTH, quick-answer guide to over700 TV circuit troubles.If you service TV re-ceivers, this book offersyou more practical helpfor the money than anyother ever published.Using 63 large -sizephotos of different pic-ture -troubles, keyed totrouble -finding chartswhich identify over 700probable defects, youcan pinpoint almost

any TV circuit or component defect in min-utes. 50 detailed charts pinpoint the most prob-able defect causes in every circuit or majorcomponent-from tuner to picture tube, fromsound and audio to power supply. A 6 -pagetrouble -symptom chart allows you to find theappropriate reference chart. Contains over 160waveform photos to compare with those onyour scope-in each case explanations tell youthe most likely causes for improper wave -shapes. 372 pps., 394 illus. Hardbound.List Price $8.95 Order No. 428

How to Use Test Instruments inElectronics Servicing

A long -needed, practicalhandbook on test equip-ment applications -ranging from the useof audio gear to tubeand transistor checkers.Just what you need toput your test equip-ment to work. Not a"how -it -works" treat-ment, but a "how-to"manual describing spe-cific tests and trouble-shooting techniques forthe electronic techni-

cian. You'll discover new ways to use yourscope and several new "tricks" you can per-form with multitesters. You'll learn signal -in-jection troubleshooting, how to measure induc-tance and capacitance with the help of yoursignal generator, pointers and pitfalls for us-ing markers, sweeps and pattern generators,shortcuts and special techniques for color TVtroubleshooting, how to test audio circuits andFM stereo equipment, and much more. 266pps., over 200 illus. Hardbound.

ItSTRUMERT

ECTRONICS

Ust Price $7.95 Order No. 485

Working with Semiconductors

EmlICIONDOCIORS

At

A BRAND-NEW work-ing guidebook to semi-conductor circuit oper-ation of value to tech-nicians and others whowork with solid-stateEquipment. The won-derful aspect of thisbook is that you canreally develop a thor-ough understanding ofsemiconductors - andactually enjoy doingit1 In striking contrastto the usual textbook

approach, this up-to-the-minute volume avoidsdry, theoretical mathematical explanation-ittells you simply how and why things work ...backed up by large, clear expository illustra-tions. More advanced circuits covered are:transistor oscillators, multivibrators, Eccles -Jordan and Schmitt trigger circuits, crystal -controlled generators, counters, power supplies,high -frequency circuits, field-effect transistors,unijunction transistors, tunnel diodes, SCRs,etc. 224 pps., over 185 illus., 15 Chapters.

List Price $7.95 Order No. 501

AN EXTRAORDI NARY 34 ELECTRONIC TECHNICIAN/DEALER, JANUARY 1972

ANY3

An Extraordinary Offerto introduce you to the benefits of Membership in

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tional Club Selection you purchaseFor the small charge of only $1.99,plus three (3) Certificates, you mayselect a book of your choice from aspecial list of quality books periodical-ly sent to Members.6. Prevents You From Missing NewBooks: The Club's FREE monthlyNews gives you advance notice of im-portant new books . . . books vital toyour continued advancement.

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SEND NO MONEY! Simply fill in and mail postage -paid Airmail card today!

... for more details circle 104 on Reader Service CardJANUARY 1972, ELECTRONIC TECHNICIAN/DEALER 37

Fincowill pay your

first year's dues ineither NEA or NATESA

and giveyoua profit to boot!

THE F NNEY COMPANY

A sensational "never before" contributionto the security, growth, and future of all

independent television service.

YES! FINCO is offering

$59,50000(Merchandise at Retail Price)

The Finney Company, in making this "never before"$59,500 (unsolicited) offer-looks forward to continuedclose association and mutual support with INDEPEND-ENT SERVICE in the common cause of good productquality coupled with unquestioned, efficient "INDE-PENDENT TELEVISION SERVI('E".

This offer is limited to 1000 new affiliations(500 NEA - 500 NATESA)

SUPERIORINDEPENDENT SERVICE

FINCO SUPPORTS SIS

THE FINNEY COMPANY34 West Interstate Street

Bedford, Ohio 44146

Morns L inneburgh. Sr E H F"The Champion of independent Serv,ce

FINCO's 1972 Objective:1,000 TOTAL NEW MEMBERS!

500 NEW NEA MEMBERS!500 NEW NATESA MEMBERS!

I. MEMBERSHIP DRIVE STARTS: January 1. 1972 through March:11, 1972

2. All New Members must be signed up and approved by either NEA orNATESA. ($35- First Year Dues Paid.)

:1. Each approved NEW NEA or NATESA Member will receive fromThe Finney Company a GIFT CERTIFICATE good for $35 worthof FINCO PRODIA"I'S at SERVICE DEALER WHOLESALEPRICE! When sold to your prospective customer at regular price( approx: $59.50) you will have received hack your original $35 dues -PLUS -a $24.50 NET PROFIT! - THAT'S RIGHT! - FINCOis actually making it possible for each new affiliate to make a $24.50profit by joining either NEA or NATESA!

1. FINCO MATV equipment and all FINCO Outdoor Antenna Modelsare included - Rabbit Ears (Indoor Antennas) ARE NOT IN-CLUDED IN THIS OFFER.

5. New affiliates should NOT contact The Finney Company for theirfree Gift Certificates - All questions and correspondence should bedirected to NEA or NATESA Headquarters.

6. NEA and NATESA shall have the sole jurisdiction as to the pro-rating of FINCO Gift Certificates to their respective Districts, Statesor specific areas. Their decision shall be final.

rFor further information as to how you can take advantage of FINCO'Samazing offer, fill out and send this coupon to either NEA or NATESA.(Check preference)

NEA - 1309 West Market St. - ITTA Bldg., Indianapolis, Ind. 46222

NATESA - 5908 South Troy Street. Chicago. Illinois 60629

L

Service Dealer

Addresss

City State 24,

Per

. . . for more details

38 ELECTRONIC TECHNICIAN/DEALER, JANUARY 1972

circle 111 on Reader Service Card

ELECTRONIC TECHNICIAN DEALER JANUARY 1972

TEKLAB REPORT

Motorola's Model TU945HS Color -TVby Joseph Zauhar

The new power supply provides regulation

for all output voltages and has self-protection

through automatic shut off when overloaded

It is generally agreed by many inthe television industry that the fu-ture trend of color -TV chassis willbe toward more plug-in panels ormodules. Motorola has employedplug-in panels in practically all cir-cuits of the color -TV chassis and for1972 they have extended this appli-cation to include much of the powersupply.

Upon unpacking the MotorolaModel TU945HS, employing theATS-938-A06 color -TV chassiswith Insta-Matic color tuning, wegave it a quick once over and foundthat it looked very similar to theearly TS915 solid-state chassis in-troduced in 1967-with "the worksin a drawer" for easier servicing.Only the essential customer controlsappear on the front panel, and thesecondary controls, which are lessimportant, are enclosed behind thepanel door for a neat unclutteredappearance.

After removing the back cover bycompressing six clips and looseningone screw, some important new cir-cuit modifications were noted. Aseparate power supply chassis isused (Fig. 1), which includes thehorizontal -sweep DA panel, powersupply JA panel, horizontal outputtransformer, focus block and high -voltage rectifier. The horizontal andpower supply panels are bothplugged in for easier servicing. Thevoltage -doubler diodes are mountedon a plug-in card for ease of servic-ing and fit only one way into thesocket. By removing four screws,

the complete power supply can beremoved or tipped up for servicing.

A smaller, lighter flyback -typetransformer (Fig. 2) is used in thenew power supply, replacing theheavier iron -core transformer pre-viously used. With the higher pow-er -supply frequency, it is also possi-ble to use filter capacitors that aresubstantially smaller in both sizeand capacitance. The oscillator,shaper, driver, overload -shut-offswitch and regulator circuits are allplaced on the plug -on panel (desig-

nated the JA panel) along with thepower transformer. The total weightof this panel is approximately 13/4lb as compared with the convention-al Motorola heavy iron -core powersupply which weighed 13 lb.

Electronic control circuits areused to automatically adjust forload demands, to regulate outputvoltages and to automatically shut-off when overloaded.

The power supply operates at ahigh frequency -15 ,750Hz-whilethe conventional power transformer

Motorola's Model TU945HS Color -TV set employing the ATS-938-A06 chassis with a simplified, one -panel remote -control system.

JANUARY 1972, ELECTRONIC TECHNICIAN/DEALER 39

operated at a line frequency of60Hz. By increasing the frequency,an important reduction in iron con-tent is achieved, since less iron is re-quired to maintain the same pri-mary -to -secondary efficiency.

A new vertical panel eliminatesthe vertical output transformer, thevertical oscillator, drivers and com-

Motorola's ATS-938 color -TV chassis is similarto the early TS915 "works -in -the -drawer" col-or -TV chassis. Courtesy of Motorola.

Only the essential customer controls appearon the front panel, the less important sec-ondary controls being hid. behind the paneldoor.

After remcving four screws, both the horizon-tal output and the complete electronic powersupply can be removed.

plementary symmetry output feed-ing the deflection yoke directly.

An external speaker jack (Fig.3), located on the antenna terminalboard, allows the sound output to beplayed through an additional speak -

Fig. 1-Pear view of the color -TV set contain -in; a separate power -supply chassis behindthe picture tube.

Fig. 2-A new JA power supply panel is used,replacing the heavier iron -core conventionaltransformer.

er system by utilizing phono plugconnectors. Two additional standardphono-type receptacles permit thecustomer to play the monaural TVsound output through a high imped-ance amplifier and its associatedspeaker system for better sound re-production.

w

VEF JD CHM3

fikLIEF 30 CAIN

el"

MONAURAL AUDIO

OUTPUT TO NIGH

IMPEDANCE AMP

10 EXT8 16 OHMS

MIRE TIES IN IRIS RECEIVERIN1I ,PAL APLOSION PAO-

IF;.TION REP13.A WITH A TUBE OF'Pr SAVE '`E3'F NUMBER IL* CON -111,1.113 1Af11-.

Fig. 3-1n external speaker jack is located onthe antenna terminal board. which allows thesound a ltput tc be played through an addi-tional sFeaker system.

Fig. 4-The TV set ac line voltage was reduced to 85v and st II we obtained a full -screen colorraster.

40 ELECTRONIC TECHNICIAN/DEALER, JANUARY 1972

Also, provisions are made for a300f/ or 75f/ antenna input forVHF reception and a 300fl inputfor UHF reception.

Power Supply OperationWe were curious concerning the

amount of regulation this new elec-tronic power supply really providedand a check was made with the fol-lowing instrument set-up:

The input ac voltage to the TVchassis was varied with a voltageregulator and monitored with aSimpson 460 Digital VOM, whilethe output voltage obtained fromthe 200v source, Terminal No. 14of the JA power supply panel wasmonitored with a Hickok ModelDP100 Digital Voltmeter.

Upon fluctuating the TV chassisac input voltage between 110v and120v, we noted only a small varia-tion of lv to 2v from the 200v dcoutput voltage source-good volt-age regulation being noted on theraster with virtually no shrinkage.Then we reduced the line voltage to85v and were amazed with the fullraster and color obtained (Fig. 4).

From these various bench checks,it is apparent that the electronicpower supply maintains a fairly con-stant regulated voltage. (The com-plete schematic showing the powersupply and other circuits can befound in this month's Tekfax Sche-matic No. 1395). An electronicswitch to ground (Fig. 5) suppliesdc voltage to the transformer pri-mary. This switch is turned oN andOFF at the horizontal scan frequen-cy, developing interrupted dc volt-age in the primary similar to the vi-brator action in early car radios.This 15,750Hz transforms the samepower to the secondary as the con-ventional transformer but is sub-stantially smaller and lighter.

The three stages needed to acti-vate the switch at the required 15,-750Hz rate are shown in Fig. 6.(The same period of time betweeneach waveform is represented bythe shaded areas.) The oscillator islocked at the horizontal scan fre-quency by a pulse obtained from thehorizontal sweep circuit. Convertingthe oscillator signal to a squarewave is accomplished by the shaper,and the driver amplifies the square

wave to a switchable level for turn-ing ON the switch transistor. If thesquare wave to the switch transistoris absent, the switch transistor willnot turn ON and when the switch isopen there is no primary current-the supply remains OFF.

Power Supply Load ChangesWhen the TV receiver brightness

Fig. 5-The power supply uses the horizontalscan frequency generated by a separate oscil-lator to operate the switching transistor.Courtesy of Motorola.

level is increased, the demand forpower rises. The additional powertaken from the low -voltage supplysecondary must be supplied by theprimary, the primary power follow-ing the secondary power demands.

Fig. 7 illustrates the regulation ofdc voltage applied to the primary.When the secondary winding de-mands more power, the required in-crease in the primary current is ac-complished by closing the switch fora longer time. This allows the pri-mary current to increase, satisfyingthe secondary demand. To increase

Very few of the component parts are locateduncle. the power supply chassis.

-1:-

I 15 7 5 Oliz

OSC

SYNC FROMHORIZ SWEEP

El C

DRIVER OFF

t

SWITCH ON o0 A 11

Fig. 6-Three stages are required to develop the square wave used to turn ON the transistorswitch. Courtesy of Motorola.

OSC. ON

I 15.750HzOSC

SYNC FROMHORIZ SWEEP

DCRI GULATOR

DC

OAD

Fig. 7-Voltage regulation in the power supply to meet load changes. Courtesy of Motorola.

JANUARY 1972, ELECTRONIC TECHNICIAN/DEALER 141

this time interval, the square -waveswitching signal must be altered byapplying a control voltage to theshaper.

Square -wave alternation is initi-ated by a separate secondary wind-ing. As the load increases, the sec-ondary voltage decreases. The de-crease in voltage is sensed by theregulator which, in turn, acts on theshaper to alter the square wave. Thesquare wave switching signal nowturns oN the switch transistor for alonger duration (commonly referred

to as the duty cycle). The frequencyof the square wave does not change,remaining locked at the horizontalscan rate. The width increases andturns the switch oN longer, allowingthe primary current to increase.

From the waveforms (Fig. 8) wesee that for an increase in power de-mand, the regulator causes the shap-er to conduct longer, the driver con-ducts less and the switch conductslonger. The increase in power de-mand is now satisfied by increasingthe width of the turn -on signal for

0liC. ON

15 750H;0 C

SYNC FROMHORIZ SWEEP

--.4

SHAI1ER ON

SHAPER

DC

F-1-1DRIVER OFF

DRIVER

71SWITCH ON

SWITCH(Itansostot)

V

REGULATOR

DC

LOAD DEMANDINCREASES

II`

Fig. 8-The regulator responds to the increased load and increases the width (duration) of thesignal supplied to the switching transistor. This increases the primary field current to satisfy theload demand. Courtesy of Motorola.

UtiL

HOWSWI IFSYNC

,,FLAPF DRIVER

OVER LOADSHUT OFF

IINPUT RECT(DOUBLER)

SWITCH

SCR

REGULATOR

10

REG CONTROL

Fig. 9-A silicon controlled rectifier shuts OFF the switch, should a damaging overload occur.Courtesy of Motorola.

the switch. This action can be seenby comparing the width of the shad-ed areas of each waveform in Fig. 8to those in Fig. 7.

The opposite action occurs whenthe load decreases-now the secon-dary voltage rises. The rise is sensedby the regulator, which in turn actson the shaper to alter the switchingsquare wave. The shaded portion ofeach waveform in Fig. 8 reduces inwidth and the duty cycle of theswitch is less, reducing the primarycurrent. This in turn reduces thesecondary power, and we have com-pensated for the reduced load. Sincethe regulator senses secondary volt-age changes, the net result is a main-tained constant secondary voltage.

Line Voltage Changes

When the line voltage changes,the same voltage compensation oc-curs as when the secondary voltagechanges with load. If the line volt-age increases, the secondary voltageswill rise. However, the regulatorsenses the voltage increase and re-duces the oN time (the width of thesquare wave at the shaper andswitch). With the switch oN for ashorter period, the primary currentis reduced. This reduces the fieldand lowers the induced secondaryvoltage. We now have compensatedfor the ac line voltage increase.

Overload Shut Off

The overload shut-off stage (Fig.9) employs a silicon controlled recti-fier (SCR) which samples the switchtransistor emitter resistor voltage.When overload occurs, causing theswitch emitter voltage to reach apre -determined level, the SCR firesor turns ON. After the SCR fires, the

continued on page 67

The vertical VA panel, with two vertical outputtransistors, makes use of complementary sym-metry and provides direct output to the de-flection yoke, thus eliminating the vertical out-put transformer.

42 I ELECTRONIC TECHNICIAN/DEALER, JANUARY 1972

Working withCommercial -Audio

Equipmentby Jack Hobbs

Part I Expand your audio -equipment knowledge and

increase your skill value

in one typical intercom/music/paging system located in a high-class restaurant. the bar attend-ant can flash pickup orders to waitresses or page a guest who receives a telephone call.

Commercial audio is recognizedas a specialized business, like colorTV, for example, which requiresspecial knowledge and experience.But it is not the sole province of"audio specialists" because manyTV -radio technicians and servicedealers, especially those operating inmedium-sized cities and suburbanareas of large cities, have successful-ly diversified into this fast growingbusiness during the past two dec-ades.

The BusinessThe audio communications equip-

ment business encompasses public

address (PA), home- and business -intercommunications (intercom),audio paging, private telephone sys-tems, music distribution, electronicmusic instruments and audio-visualequipment. And it should be under-stood by now that "audio-visual"covers not only conventional teach-ing -lab equipment but also closed-circuit TV (CCTV) and video-taperecording (VTR) equipment. Forthe information of the TV -radio ser-vice dealers, however, it should bepointed out that expansion intoCCTV and VTR equipment sales,installation and service, requires awell -healed, well -staffed, well -in-

strumented organization. But, as aTV -radio technician, you can moveinto the overall audio business byexpanding your knowledge some-what-including the proper applica-tion of a few additional test instru-ments. The basics will be outlined inthe course of this article series. It isbeyond the scope of these articles,however, to cover some of the afore-mentioned areas-including home -and business -intercom, audio-visualand private telephone systems. Letus begin by taking a look at someequipment used.

Basic Audio ComponentsThe basic components employed

in ordinary audio communicationssystems may include: amplifiers,speakers of various types, micro-phones, distribution transformers,cabling, connectors and other hard-ware. Auxiliary equipment may in-clude phonograph turntables, tapeplayers, AM/FM tuners and per-haps combination preamp/mixing/control units- the latter being usedmostly as separate components inlarger more elaborate, higher -pow-ered installations. Additionally, wewill also be using a few test instru-ments for installation and repairwork.

Although electron -tube type com-mercial amplifiers are still beingmade, especially in the high-pow-ered category, many solid-state am-plifiers are now available and re-search and development in this areais moving swiftly toward practical,higher -powered units.

The larger number of low- andmedium -powered general purposeinstallations made today employcombination preamp/mixer/ampli-fier units built in one chassis. Aspreviously mentioned, a separatepreamp/mixer/control unit is oftenused with a separate high-poweredamplifier. Almost any type of com-bination, to satisfy the most uniqueapplication needed, is available inpower ratings ranging from 1 Ow to200w. Separate amplifier types arecommon from about 30w to 300wand higher.

You will find it necessary to "de-sign" most installations to fit partic-ular application needs. These cus-tom -designed installations may be inconsole- or rack -mounted form,

JANUARY 1972, ELECTRONIC TECHNICIAN/DEALER 43

available. These units are generallyruggedized and easy to transportfrom one location to another. Themobile systems are usually designedto operate on 12v, negative -groundbattery hookups. Solid-state ampli-fiers, having modularized preamps,remote master VOLUME controls andother items are becoming popular.

containing a preamp/mixer/controlunit, plus one or more power ampli-fiers, input equipment (turntable,tape player and AM/FM tuner),and one or more microphones.

A wide variety of portable -typeamplifiers and speakers, designedfor both fixed and mobile service,operated on ac or batteries, are also

Planring a panel, catinet mounted audio system.

You may find it necessary on some jobs to design and assemble special elaipment.

10001

Kitchen attendant at microphone where pick-,up orders can be dispatched to waitresses

--- anywhere in the restaurant dining -room flooror in the cocktail -lounge area.

This is also true of highly efficient,direct -coupled, transformerless, sol-id-state amplifiers.

It is difficult to place the tag"typical" on any existing audiocommunications systems, becausethe broad flexibility inherent in thesesystems allow "tailor-making" in-stallations to fit any need. Hence,each installation is usually different-especially when considering par-ticular location.

But one basic system, in great de-mand today by restaurants, stores,group -practice dental and doctors'offices, business offices, schools,hospitals and even homes, is thecombination intercom/music/pag-ing system.

Some time ago we checked on asimple installation of this type lo-cated in a high-class restaurant andcocktail lounge, which had an over-all seating capacity of about 120people. The system used a 20w am-plifier and two microphones-onelocated at the table -service end of

A handy and inexpensive slide rule by Jensenis an aid in calculating speaker sound -pressurelevels for various powers at different dis-tances.

44 I ELECTRONIC TECHNICIAN/DEALER, JANUARY 1972

the beverage bar and the other mikein the kitchen at the rear of the res-taurant. Although waitresses givetheir orders directly to the kitchenand bar, pickup instructions, whichspeed the process, can be flashed towaitresses from both microphone lo-cations via flush -mounted ceilingspeakers throughout the restaurant.

A simple number system is em-ployed for pickup orders to the wait-ress: "Kitchen three" (waitressnumber three, your order is ready inthe kitchen) "Bar three" (waitressnumber three, your order is readyat the bar). But these orders areused primarily during peak rush pe-riods.

Customers can be paged from thebar microphone when they receivetelephone calls. A regular telephoneis located behind the bar, and adialess extension is easily accessibleto the customer near the service endof the bar.

Continuous dinner -type music ispiped in through telephone lines(Muzak system) from a central dis-tribution point in the city and fed atlow level to an amplifier input. Inmany installations of this type, how-ever, background music is providedeither through an FM station sub -carrier or locally by either continu-ous cartridge- or cassette -type auto-matic tape players. Music to thespeakers is set at a very low level(background music is heard, not lis-tened to)- just slightly above thefull -house background noise. Themicrophone order and paging levelis set somewhat higher.

Audio Installation Design-First the Survey

As previously mentioned, it willbe necessary to "tailor" each systemto fit individual locations. And thisfact makes it necessary to begin in-stallation design with a survey todetermine the component character-istics required for a particular loca-tion. Among other things, a pre -system -installation survey deter-mines the amplifier type and power;speaker types, power rating andnumber of units needed; distributionsystem type and a few additional in-stallation details. Of course, to someextent, the customer will help you inthe beginning when he tells youwhat he wants the system to do. So

listen to him carefully. After that,your job is to find out what equip-ment you'll need to provide satisfac-tion. But if you're a modern, wide-awake, sales -engineer, you will havealready "cased" the place and willgo there fully prepared to sell yourproduct on the basis of its providinga profitable service to the prospect'sbusiness.

Last, but not least, the total sur-vey will yield intelligence uponwhich you must base a major por-tion of the installation cost estimatethat you must present to the pro-spective customer.

In some cases, it will not be easyto make the components fit the loca-tion. But when you have completeda few satisfactory installations andkept detailed records, you will soonget the "feel" of the business andfind that you can skip around a lotof "cut -and -try" experimental cor-ners. Until you reach this point,however, you may have to do a bitof on -the -spot checking. The "typi-cal" system described here will usu-ally be a straight -forward design jobpresenting few problems. This istrue for a number of reasons.

First, the "typical" system is usu-ally installed in a new, renovated orredecorated area which has a lowceiling and a considerable amount ofsound -absorbing materials on theceiling, walls and floor. Although anarea of this type may be moreacoustically "dead" than "alive," itcertainly won't present any difficultreverberation problems. Under theseconditions, you need only determineby experimentations the types andnumber of speakers required, theirindividual and total power require-ments, and then select an amplifierhaving sufficient power output todrive the speakers.

Checking AcousticsA practical way to sense the

acoustical qualities of a location ofthis type-and hence an idea of thenumber of speakers required andtheir placement-is to walk throughthe area while carrying on a conver-sation with another person at vari-ous distances apart. If the conversa-tion can be maintained intelligibleat varying distances merely by rais-ing and lowering the voice levelsslightly, you probably have a near -

ideal situation. If not, you may havea problem. In the "typical" systemexample described here, only fourlow -wattage speakers were neededfor the entire area-one in thekitchen, one in the bar and cocktail -lounge area, and two others spacedin the dining area. With speakersmounted in the ceiling, distributionof audio intelligence is omnidirec-tional and generally uniform over acircular area.

On many pre -installation surveys,you will find it helpful to use a spe-cialized electronic tool-variouslycalled "sound" level, "noise" levelor "audio" level meter. This instru-ment is useful in making back-ground noise measurements underfull -house, full -activity conditions.Let's remember that the backgroundnoise level is a major factor whichdetermines speaker power and, inturn, amplifier power requirements.Human bodies and clothing absorbconsiderable audio power, too. Butthis is not a major consideration inthe small seating capacity areaspecified in the "typical" system de-scribed here. In a larger place, witha much greater seating capacity andsimilar sound -absorbing walls, ceil-ing and floor, a proportionatelylarger amount of power would berequired.

Another important tool in makingpre -installation surveys is a medium -power portable audio system with amicrophone and speaker. It is alsodesirable that the amplifier have70.7v of audio output. In this man-ner, a few matching transformerswill make it easy to check speakerinput power accurately. A tape re-corder or straight player having apre-recorded music tape will alsoprove helpful if the system is to in-clude music distribution.

The pre -installation survey alsoprovides an opportunity to measurethe entire area dimensions to deter-mine the length of individual speak-er runs and the total amount of dis-tribution cable needed. The wiresize will depend on the type of dis-tribution system used, line imped-ance and length of runs between am-plifier and speakers. For example, a1611 low -impedance pair made fromsize 20 B&S gauge wire is good forup to about 100 ft in a direct -con -

continued on page 67

JANUARY 1972, ELECTRONIC TECHNICIAN, DEALER 45

Servicing witha Color -TV Test Jigby Joseph Zauhar

Taking a console color -TV set into the shop can

be a relatively simple one-man job-if you leave thecabinet and picture tube behind

o Most of us forget the color -TVtest jig when expanding our servicefacilities, but when properly used itcan be one of the most valuabletools for troubleshooting and elimi-nates many hours of time and guess-work. Not only does it make color -TV shop work physically lighter, ithas a number of features that simpli-fy troubleshooting color -TV prob-lems.

Many of the hardest to locatetroubles in color -TV set servicing

can be caused by the picture tube it-self, and unfortunately some ofthese defects cannot be detected byeven some of the better color -pic-ture -tube testers. To remove or re-place a color picture tube for test-ing purposes can be an expensivepractice, and one mistake can morethan pay for a test jig. With the jigwe know that the picture tube andother jig components are good, andsuspected components in the defec-tive TV set can be checked by sub-

Econo-Jig Components

Universal 90 yoke

Blue lateral magnet

90 picture tube extension

Convergence load

Ground lead

Convergence yoke

Yoke extension

Metal Cabinet

Anode extension

Actual well proportion picture obtained on the color -TV test jig1K18 -1A color -TV chassis.

when connected to the Admiral

stitution with but a few simple con-nections.

A shorted yoke winding or defec-tive dampening components, whichcause loss of high voltage or insuf-ficient vertical and horizontal sweep,are other problems which can beisolated with the jig. Convergence -board problems are also among themany troubles that can be diagnosedwith the color -TV jig, since it em-ploys only static convergence forrapid servicing-eliminating trou-blesome dynamic convergence ad-justments.

We obtained a TeleMatic ModelEJ190 19 -in. color -TV test jig kitfor evaluation. It contained all thenecessary components-less the pic-ture tube. We found the step-by-stepassembly instructions quite easy tofollow. This exact procedure shouldbe followed or you will find yourselfinstalling screws in hard -to -reach lo-cations. The three wood -grainedmetal sides are bolted together, theadjustable deflection yoke bracketsbeing bolted to a 443 -in. plywoodbottom panel. Three eyebolts are in-stalled on the plywood -reinforcedmetal top, which permits hangingthe jig if desired.

After assembling the jig frame,we installed a 490AJB22 19 -in. col-or -TV picture tube within the jig,securing to it the static convergenceand yoke assemblies. This is a re-built tube that we obtained throughthe courtesy of Griffiths ElectronicsInc. (Any other 19 -in. color -TVpicture tube could have been sub-stituted.)

The color -TV jig was used withan Admiral 1K18 -1A color -TVchassis. Referring to Telematic'scolor -TV test jig accessory crossreference, we found that the "K" se-ries Admiral color -TV set calls for aYA12 yoke extension adapter,which was supplied with the jig.(This guide lists virtually all chassisand is available free of charge fromthe manufacturer.) In connectingthe TV set to the jig, we attachedthis octal yoke extension adapterbetween the jig's yoke assembly andthe yoke leads on the TV -set chassis-no additional adapters were re-quired.

Next, we connected the color -TVanode extension between the TV -setchassis anode lead and the anode of

46 I ELECTRONIC TECHNICIAN; DEALER, JANUARY 1972

the jig tube. A sturdy anode contactbutton, anchored into a shockproofhousing, is well designed to preventcorona leakage.

A convergence load is required toproperly load a portion of the verti-cal -output circuit-replacing the

Inside view of the complete TeleMatic ModelEJ190 color -TV test jig when used with a re-

built 490A1B22 19 -in. color picture tube sup-plied by Griffiths Electronics Inc. The exten-sion leads are connected to the color -TV chas-sis.

The octal socket yoke extension adapter sup-plied with the jig has ample length and is

common to many color -TV chassis yoke sock-ets.

Side view of TeleMatic's color -TV test jigshowing the wood -grain metal sides.

convergence board. The color -TVjig uses a static -type convergence forfaster servicing, while the cross ref-erence calls for a CD52 convergenceload. (In a few Motorola modelsthis load is instead accomplished byconnecting a 50µf, 150v electrolyticcapacitor from pin 3 of the verticalamplifier to ground.)

After completing all of these con-nections, the color -TV set wasturned ON. A good color picture wasthen produced on the jig, althoughthe gray scale was a little on theblue side due to a difference in colorpicture tubes. (This gray scalecould have been corrected by mak-ing chassis adjustments, but then thecontrols would have had to havebeen returned to their original set-tings when going back to the origi-nal picture tube.) The picture wasvery well proportioned. The dc orstatic convergence was good-the

The design of the anode contact button on thecolor -TV anode extension allows for very littlechance of any corona leakage and includes aneasy -grip handle.

TeleMatic's convergence loads have sockets tomatch most color -TV chassis. The one at theright is supplied with the test jig.

vertical and horizontal dynamic con-vergence being only off a little (andthis doesn't matter during bench ser-vicing).

We were very impressed with thetest jig and consider it a very usefulservice tool.

Rear view of the color -7V test ig with thebeck cover in place. The leads can also be

placed through a hole in the bottom of thecabinet.

TeleMatic's Match-A-YoKe Model MY -99 is a

switchable yoke imledarce notching box. Itcorrects for variations in yoke inductances ofdifferent chassis u oiler test.

JANUARY 1972, ELECTRONIC TECHNICIAN / DEALER 47

DiagnosingPower Supply Circuitsby Melvin Nethery

Most electronic technicians and engineers will agree

that a TV set, especially one for color -TV reception,

contains complex circuitry-the power supply beingno exception

A technician in today's electron-ics cannot memorize each trouble asrelated to each specific make andmodel TV set. He must diagnose de-fects, taking into account the infor-mation gained from certain symp-toms, tests and past experience.Sometimes plain old luck plays ahand, but remember, close analysisof a lucky hit can aid in futuretroubleshooting.

A power supply may seem to besimple enough from a theoreticalstandpoint, but in a TV set it canproduce some of the most elusivetroubles you can encounter. Most ofthem occur for one reason: The fil-tering and distribution circuits ofthe dc power supply also performdecoupling tasks, as well as reduc-ing ripple.

BRIDGE AND FILAMENTCIRCUITS

When looking only at the rectifiercircuit, a technician should be ableto determine the ripple frequency.Ripple frequency is an importantmeasurement to make. If, for in-stance, the TV set uses a bridge rec-tifier, the output Of the rectifiershould have a ripple frequency of120Hz. To measure this frequency,place the scope probe on a hot fila-ment lead, via a blocking capacitor,and set the scope for two completecycles. The filament, of course, con-tains a 60Hz ac voltage, and yourscope is now referenced at 60Hz.Next, place the scope leads at therectifier output, and you should ob-serve four cycles of ripple voltage. Ifonly two cycles are displayed (indi-cating 60Hz instead of 120Hz),

the bridge has an open diode.In some TV sets, an open diode

in a bridge circuit will not greatlyaffect its operation-other than up-setting degaussing operations. Thiscan be a tough one for the techni-cian who has not had the occasionto attend service clinics or previous-ly experienced this particular prob-lem, for once the set is turned OFF,the screen will be magnetized in-stead of being degaussed. Oncemanually degaussed, the TV set willoperate satisfactorily again until it isonce more turned OFF.

Many times a technician will justunplug the automatic degausser,manually degausse the TV set andmove on. This is not an acceptablerepair method. Although the TV setmay appear to work fine, it will usu-ally work better and be more stableif the defective diode is replaced.

If a diode shorts within any pow-er rectifier circuit, the safety over-load device (circuit breaker, fuse,etc.) will open. It shouldn't be nec-essary to go into the various diodeconfigurations, the main thing to re-member is the bridge circuit.

As far as hum is concerned, it isrelatively easy to isolate by check-ing ripple amplitude with a scope.Always observe the scope wave-forms to note if there are two humpeaks or just one. If there is justone hum peak and the TV set usesfull -wave rectification, then the humprobably originates from the fila-ment source. There may be eithera heater -to -cathode short within atube or a bad ground connection.One exception might be an open di-ode in the bridge configuration, al -

Melvin L. Nethery

though in a good quality TV set, thefiltering networks will filter 60Hzalmost as well as it will 120Hz, thushiding the symptoms of an opendiode. However, anything is possible.

GROUND CONNECTIONS

Virtually all currents, ac and dc,flow within the ground foils of aprinted -circuit board of the TV-setchassis. Unstable ground connec-tions, especially in printed -circuitboards, can drive a technician up thewall. Here is what can happen: Alow resistance develops between theground foil and metal chassis. Con-stant temperature changes cause thesolder to crack where the foil eyeletis soldered to the metal chassis tab.Chemical changes take place withinthe cracked connection; and beforeyou know it, a resistance has beenformed where there had been a solidground.

In Fig. 1 we can see that all sig-nals developed on the ground foilwill interact and upset each circuit'soperation. The symptoms will de-pend upon what circuits are in-volved and the degree to which theground connection has deteriorated.Remember: Relatively heavy cur-rents flow in these ground foils andonly a small resistance is needed todevelop a signal voltage on theground foil.

Most bad grounds will causesymptoms of an intermittent natureand are usually heat sensitive. Here

48 I ELECTRONIC TECHNICIAN/DEALER, JANUARY 1972

ud Ground

on Ground To t

So AreaMagnified Mould Tab

IChasso Ground,

Fig. 1-Current (I ) flowing from chassis ground through cracked solder resistance (R,) developsunwanted signal voltages on the ground foil. This current (LI contains 60Hz filament current fromtube V1, along with cathode signal current from tubes V._! and V.,.

is a partial list of symptoms causedby bad grounds: Intermittent red, blue or green

hum bar (60Hz) Reduced high voltage-caused by

bad ground in video amplifier-upsets bias on CRT, causinggreat current demands in thehigh -voltage circuits

Picture goes black intermittently-high voltage normal

Intermittent horizontal pull Intermittent streaking and picture

waver AC modulation of picture and

raster

CASE HISTORIES

Let's look at a few case histories,their symptoms, analysis and cure.

Sweep -Circuit ModulationAn inexpensive portable TV set

came across our bench with its ras-ter bending at a 60Hz rate (Fig. 2).

0-s.A5A/V-tTZK

RI

160&

t

lOnp.

I

Fig. 2-By changing value, resistor R1 causedan objectionable raster bend in an economy TVset.

'The tubes were good, the filters wereokay, and the grounds were soundas a rock.

The raster bend persisted and theonly clue was a slightly higher thannormal voltage on the low side ofresistor R1. This resistor had heat-ed and changed to a very low value,causing improper filtering.

I had a similar case where a filterchoke was used instead of the 1.2Kresistor. The choke had burned andlost some of its reactance, causingraster bend. This defect will notcause severe bending, but it will cer-tainly be objectionable. Also be onthe lookout for components thathave been changed to an impropervalue when previously replaced bya less experienced person.

Apparent Sync BuzzA B/W -TV set came into the

shop with what appeared to be syncbuzz. The first step in our analysiswas to pull the vertical tube whilethe BRIGHTNESS control was turneddown. The buzz stopped. This onecheck told me that the problem wasnot sync buzz-it was vertical buzz,

which is at the same frequency asthe sync. (Another check that willtell you the same thing is to turn theVERTICAL-HOLD control to unlockthe vertical oscillator. If the buzzchanges pitch, the trouble resultsfrom vertical spikes feeding into theaudio from the vertical stages withinthe TV set itself.)

The cause in this case was a filtercapacitor common to both the verti-cal circuit and the audio B+. (Notethat this can also be caused by yokeleads being too close to the audioinput circuit.) In this particularcase, there was no evidence of hum,so this filter served primarily to de -couple these signals to ground-along with whatever other ac mayor may not have been present. Don'talways associate power -supply cir-cuits with hum only.

Slight Picture TwistAnother B/W -TV set found its

way to our bench on an exasperat-ing day. The symptom was a slightpicture twist that seemed to twistaccording to picture content. Thisseemed to indicate the presence ofvideo in the sync signal. Applyinga scope to the sync output verifiedthat video was getting into the sync.It was also noted that the AGC con-trol didn't act quite right-one ofthose things you know isn't right,but just can't put your finger on.

After several hours of looking

10K

To Sync and 23vAGC TubeCathodes C118D

AGC Cortrol40/..cf

2.2K

L70862p_ h

12BY7Video Amplifier

Fig 3-Video ringing and some loss of the AGC resulted when capacitor C1180 opened ---failingto shunt to ground ac sival voltages present at the peaking coil.

JANUARY 1972, ELECTRONIC TECHNICIANiDEALER 49

Many seemingly unrelated problems

may actually all be the result of but a single

open electrolytic capacitor

POWER SUPPLY CIRCUITS ...things over, I decided to apply thescope probes to the filters in searchof unwanted "hash." Sure enough,an open filter capacitor was foundconnected to one side of the AGCcontrol. And this capacitor was alsocommon to the sync circuit.

Vertical Roll, Pinched VerticalSync

I have had many different makesand models of TV sets that haveshown these symptoms-verticalroll, pinched vertical sync. Connect-ing the scope to the output of thesync separator shows the verticalsync pulses "sucked" up into thehorizontal "hash" (1 call it hashsince it cannot be distinguished ashorizontal sync pulses when yourscope is set to the vertical syncsweep rate).

About 90 percent of the time thissymptom is caused by a defective 2 -to -5/.11 capacitor connected to thescreen of one of the video amplifiers.This capacitor can be checked witha scope. If it is open, you will see acomposite video signal developed atthe screen. This deteriorates the ver-tical sync, which will not be ampli-fied through the sync separator.

Video RingingA familiar chassis came across

our bench with not so familiar aproblem. It had video ringing, themultiple ghosts not being tunable.This indicated that the video stageswere the source of trouble. How-ever, all components checked okay.Peaking coils were checked first asthey are forever going open. Thedelay line was substituted, eventhough it checked good.

Suddenly something caught myeye. According to the diagram (Fig.3), a peaking coil with its associatednetwork should be at signal ground-via a filter capacitor. A sneakyway of grounding a peaking coil,but acceptable as far as the signal is

concerned. Sure enough, substitutinga new capacitor cured the ringingand also improved the AGC action-even though the AGC circuitshowed no apparent defects before-hand. At first the symptoms seemedfar from being related to the powersupply, but not if you are thinkingin terms of ac signals, rather thanmerely dc leads straight to the pow-er -supply filter.

SOME GENERAL PRINCIPLES

Remember to consider the "prob-ability of occurrence." Try to deter-mine the things that are most likelyto happen-checking these firstsaves time. In the case of the TV setwith vertical roll, many things couldbe checked before you work backinto the video stages, looking forvertical trouble. But why botherchecking all of these other things indepth when filter capacitors have ahigh failure rate and you know thatthey can cause so many differentsymptoms?

If the horizontal oscillator runsconsiderably off frequency, ourknowledge of theory tells us that thecircuit time constant is not right.Usually if a horizontal oscillatorcircuit is so far off frequency that itsqueals and no raster is present-everything from the tubes to theHORIZONTAL control knob havingbeen tested-the cause is probablythe filter capacitor on the B+ linesupplying power to the oscillator cir-cuit. This trouble manifests itself inmany TV sets. When the filter opens,the B+ is no longer decoupled andthe horizontal oscillator waveformrides on it. This action sets up feed-back within the oscillator as well asother circuits that may be commonto the same B+ voltage source.

Any time a TV set is infested withsome "odd -ball," hard -to -pin -downsymptom, or multiple symptoms, itis a good practice to use a scope tocheck all filters in the power sup-

ply, plus any other large -value ca-pacitors. Observe the AGC line onthe scope and check for bad grounds-the medium through which cur-rent must flow.

When checking filters with ascope, look for signals that shouldnot be present-such as video,sync, vertical or horizontal spikes,etc.-as well as excessive ripple.Also look for unwanted signals onthe AGC line. These signals cancause weird symptoms.

If bad grounds are suspected,solder copper wire from the printed -circuit ground foils directly to chas-sis ground. Sometimes the foilgrounds themselves cannot be re-liably repaired. Some designs in-corporate very unstable groundingmethods, and this is where weshould use copper wire to insure aproper ground. Although I havenever encountered them, be on thelook -out for ground loops when tie-ing ground foils back to the chassis.A good rule is to use as short aspossible lengths of wire.

CONCLUSION

Remember! Use your scope tocheck the filters and AGC line. Alsocheck for bad grounds on those"hard -to -pin -down" symptoms. Iadvise these three checks since theytake little time to perform, and theyrelate to problems high on the list oftroublemakers-areas where mostcircuit interaction takes place. Sotake a few minutes and put a "toughdog" in its place.

It is easy to cite example cases af-ter hours have been spent curing atrouble. The only hope is that tech-nicians can benefit from examples.The lesson to be learned from thecases given here is that it can be dif-ficult to isolate a symptom to a defi-nite circuit when the defective cir-cuit upsets several other stages alongwith it. The problem seems to carrya person in circles.

50 I ELECTRONIC TECHNICIAN/DEALER. JANUARY 1972

GUEST AUTHOR

Receiving Tubes Take aLook at Solid State

by Morris Lewis

From time to time we hear distributors, service dealersand technicians express some concern about the future

of the TV Service business, particularly as it relates tothe sale of entertainment receiving tubes.

Service dealers and techniciansare naturally concerned about thefuture for a product (tubes) whichhas contributed heavily to their salesand profits and for which the salesoutlook is changing. While the useof receiving tubes in new TV -setproduction is declining and the paceof solid-state usage is on the in-crease, the outlook for sales of re-ceiving tubes for replacement is farfrom bleak-in fact, it is still verypromising.

We recognize, of course, that thetotal number of receiving tubes usedas replacements has declined, at avery moderate rate, in recent years.Despite this fact, however, the de-mand for replacement receivingtubes will remain at a high levelthroughout this decade.

Furthermore, and importantly, asthe color portion of the replacementmarket continues to grow, the dollarvalue of tubes sold will continue toincrease, as has been the experienceof the last five years. Moreover, thetrend to more solid state in TV doesnot mean that the TV service busi-ness will disappear.

Solid-state components will in-duce technological changes in theservice field and the total number ofsets in use will continue to increaseeach year. Thus, only the characterof servicing will change, creatingnew business opportunities for theenterprising service dealer. In es-sence, we foresee continuing high -volume replacement tube sales (ac-companied, incidentally, by a grow-ing picture tube business) as the use

of solid-state devices in TVsets continues to expand.

Let's look at a few facts.Since there is no publisheddata on actual receivingtube usage, we'll use indus-try statistics on receivingtube sales, published by theElectronics Industry Asso-ciation, as the best indicatorof such usage.

These reports disclose that manu-facturers' sales of entertainment re-ceiving tubes for replacement usestill exceed 100 million units peryear. Sales amount to 108 milliontubes in 1969, 104 million in 1970,and our estimate is 102 milliontubes for this year. As already indi-cated, the coming years will see agradual decline, but sales will stillbe as high as 90 million units in1975.

Translating this into dollars, weforesee an even more promisingoutlook. Industry replacement vol-ume, calculated at published listprices, amounts to $423 million in1969 and $439 million in 1970.The estimate for this year is $446million, and 1975 is projected at$465 million. So, from the dollarstandpoint alone, the service indus-try can expect to attain high volumeand profits on receiving tubes forthe foreseeable future.

Now, what about solid-state com-ponents in TV sets? Solid state ishere, it's growing, and none of uscan ignore it. But, we must ask,what kind of dent is it making intoday's replacement tube business?

Morris Lewis received a B.A. degree inEconomics from Brooklyn College and tookpost -graduate courses at the College of theCity of New York, George WashingtonUniversity and Rutgers University. He joinedRCA in 1944 as a sales correspondent atthe electron tube plant in Harrison, N.J.,and subsequently advanced through varioussales and marketing positions. In 1957, Mr.Lewis became manager of DistributorProducts Administration and two years laterhe was named manager of MerchandisingCoordination. In 1960 he was appointedmanager of Merchandising, Picture Tubes forDistributor Products and since 1961 he hasbeen manager of Distributor Receiving andPicture Tube Merchandising.

Where is it heading? And, aboveall, does it represent a hindrance oran opportunity to the service dealer?

Best estimates indicate that lessthan 10 percent of the color -TV setsproduced in the U.S.A. in 1969 and1970 contained only solid-state de-vices, and for 1971 the figure maygo as high as 20 percent. After1971, the percentage will increasemore rapidly.

On the other hand, these numbersmean that more than 90 percent ofthe color -TV sets produced in 1969and 1970 still contain tubes! And80 percent of the TV sets to bemade this year will still use tubes!When viewed in the light of grow-ing TV -set sales, it can be seen thatthe receiving tube replacement po-tential will remain high for a longtime to come.

Putting all of this together, wecome up with a double-barreledconclusion: First, the service dealercan expect to replace receivingtubes, in volume, at a good profit,for the foreseeable future.

Secondly, we must be realisticand take into account the dynamicsthat characterize our industry. Tech-nology is changing and the demandsof the service technician will also

continued on page 63

JANUARY 1972, ELECTRONIC TECHNICIAN/DEALER 151

TEST INSTRUMENT REPORT

California Instruments' Digital Multimeter/Counterby Phillip Dahlen

Provides the advantage of two instruments in one

Earlier reports have stressed theimportance of having access to adigital frequency counter for precisesignal -frequency measurement, justas they have stressed the importanceof measuring voltages and currentswith the greater degree of accuracypermitted with digital readout. Butwe have been wondering why, whenboth instruments can use so manycommon components, some manu-facturer has not provided you withthe savings of combining both in-struments in one. California Instru-ments Co. has done just that, and indoing so the manufacturer has pro-vided the bonus of offering 41/2 -digitmultimeter readings, as opposed tothe 31/2 -digit readings generallyfound in other instruments.

Additional manufacturer specifi-cations for the Model 8420 DigitalMultimeter/Counter include the fol-lowing:

California Instruments' Model 8420 DigitalMultimeter/ Counter. For more details, circle900 on the Reader Service Card.

DC MeasurementRange:Accuracy:Resolution:Input Impedance:Normal Mode Rejection:Common Mode Rejection:

Overrange:Overload Capability:Reading Rate:

AC MeasurementRange:Accuracy:

Resolution:Input Impedance:Common Mode Rejection:Overrange:Overload Capability:Reading Rate:

Resistance MeasurementRange:Accuracy:

Resolution:Overrange:Overload Capability:Nominal Source Current:

Reading Rate:

Frequency MeasurementRange:Accuracy:

Resolution:Input Impedance:Overrange:Overload Capability:Reading Rate:Maximum Sensitivity:

lv, 10v, 100v and 1000v0.01% of reading, ± 1 digit0.01% of full scale10M40dB at 60Hz100dB, dc to 60Hz

80dB, dc to 60Hz, 10012 unbalance50% of full scale or 1000v maximum10,000% of full scale, not to exceed 1000vThree per second

lv, 10v, 100v and 1000v0.1% of reading, ±3 digits, 60Hz to 10kHz0.5% of reading, ± 10 digits, 30Hz to 50kHz1% of full scale, 50kHz to 100kHz0.01% of full scale1M paralleled with 50pf60dB at 60Hz50% of full scale or 500v maximum10,000% of full scale, not to exceed 500vThree per second

1K, 10K, 100K, 1M and 10M0.02% of reading, ± 1 digit, 1 through 100K range0.1% of reading, ± 1 digit, 1 and 10M range0.01% of full scale50% of full scale200v dc or peak ac1K scale, 6.2ma10K scale, 620/La100K scale, 621.4,a1M scale, 6.2ga10M scale, 620naThree per second

10kHz, 100kHz, 1MHz and 10MHz0.02% of reading, ± 1 digit, to 1MHz0.05% of reading, ±2 digits, above 1MHz0.01% of full scale, above 50Hz500K paralleled with 75pf50% of full scale or 10MHz maximum250v rms maximumOne every 2 sec0.1v rms, to 1MHz0.25v rms, 1MHz to 10MHz

Physical SpecificationsSize: 31/2 in. H by 12 in. W by 8 in. DWeight: 11 lb net

Power Requirements115 or 230v ac ± 10%, 50 to 400Hz, 18w maximum

52 ! ELECTRONIC TECHNICIAN DEALER JANUARY 1972

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-CONTENTS-CONTENTS 1965 MODELS

Covers all 1965 models for: Admiral, Airline,Andrea, Coronado, Curtis Mathes, Dumont, Elec-trohome, Emerson, Firestone, General Electric,Magnavox, Motorola, Muntz, Olympic, Packard -Bell, Philco, RCA Victor, Sears-Silvertone,Setchell-Carlson, Sylvania, Truetone, Westing-house, and Zenith . . . plus all color sets 1960-1965, at no extra cost!PUBLISHER'S LIST PRICE $19.90

CONTENTS 1966 MODELSCovers all 1966 color and B & W models of: Ad-miral, Airline, Andrea, Coronado, Curtis Mathes,Dumont, Emerson, General Electric, Hoffman,Magnavox, Motorola, Olympic, Packard -Bell, Phil -co, RCA Victor, Sears-Silvertone, Setchell-Carl-son, Sonora, Sylvania, Truetone, Westinghouse,and Zenith.PUBLISHER'S LIST PRICE $19.90

CONTENTS 1967 MODELSCovers all 1967 color and B & W models of: Ad-miral, Airline, Andrea, Coronado, Curtis Mathes,Dumont, Emerson, General Electric, Hoffman,Magnavox, Motorola, Olympic, Packard -Bell,Ph ilco-Ford, RCA Victor, Sears-Silvertone, Setch-ell-Carlson, Truetone, Westinghouse, and Zenith.PUBLISHER'S LIST PRICE $19.90

CONTENTS 1968 MODELSCovers all 1968 color and B & W models for: Ad-miral, Airline, Andrea, Coronado, Curtis -Mathes,Dumont, Emerson, General Electric, Hoffman,Magnavox, Motorola, Olympic, Packard -Bell, Phil -co -Ford, RCA Victor, Sears-Silvertone, Setchell-Carlson, Sonora. Sylvania, Truetone, Westing-house, and Zenith.PUBLISHER'S LIST PRICE $19.90

LARGE PAGES contain complete circuit schematics, replacement parts lists, alignment instructionscritical part locations, important waveforms and voltage readings.

I 1 0 - 8

TAB Books, Blue Ridge Summit, Pa. 17214I--; I enclose $34.95 for which please send me your complete 8 -Volume

postage prepaid.El Please invoice me for $34.95 plus postage. Same return privileges.

Tech/Matics Schematic offer

Name

Company

Address

City State Zip(Paid orders shipped prepaid. Pa. resident add 6% Sales Tax. Outside USA 10% extra.)

ET -12

... for more details circle 103 on Reader Service CardJANUARY 1972, ELECTRONIC TrHNICIAN / DEA! FR 53

NEWS."continued from page 33

NATESA)-1,000 total-The Finney Co. will under-write the total cost of each membership ($35.00).

4. Each approved new NEA or NATESA member willreceive from The Finney Co. a gift certificate good for$35.00 worth of FINCO antennas at the service dealerwholesale price (40 percent off the regular retail listprice).

5. Thus-when sold to a prospective customer (by thenew NEA or NATESA member) at the regular retailprice (approximately $59.50), said dealer will have re-ceived back his original $35.00 NEA or NATESA firstyear's dues-plus -a $24.50 net profit for himself.

6. The purpose of this sensational offer (absolutely nostrings attached) is to dramatically emphasize Finco'swell known 20 years of preaching the "service gospelof affiliation." (Individually, "service" is merely asheep-continually sheared. Collectively, "service" canbecome a business and economic "giant"-capable of

4(.1K

4(

41

41

4'4(

4'4(

4'

4'

4'

WE WANT YOU

**

4' *** *-ic to accompany us to the first joint service *41( *I' convention-National Electronic Associa-* *

National Alliance of Television Ser-4( *: vice Associations, International Society of* *

Certified Electronic Technicians, and Elec-4( *: tronic Technicians Association of Louisiana*

-where we can get together and prepare :*

: for a better future. Jung Hotel, New Or- ***

leans, La., August 9-13, 1972.**

4( *4( *4( *4( ************************************ *****

being heard, cooperated with and respected!)7. All Finco outdoor antenna models (standard, special,

VHF, VHF/UHF or UHF) are available-rabbit ears(indoor antennas) and MATV equipment are not in-cluded in this offer.

8. When The Finney Co. receives word from NEA head-quarters (Indianapolis) or NATESA headquarters(Chicago) that a new member has been duly qualifiedand accepted and has paid his first year dues of $35.00-a special Finco $35.00 gift certificate will be sent tosaid service dealer direct from The Finney Co.'s head-quarters office in Bedford, Ohio.

9. New affiliates should not contact The Finney Co. fortheir free gift certificates-all questions and correspon-dence being directed to NEA or NATESA headquar-ters.

10. NEA and NATESA shall have the sole jurisdiction asto the prorating of Finco gift certificates by percentageto their respective districts, states or specific areas.Their judgment and decisions shall be final.

11. If-at the end of the membership drive (March 31,1972)-there remains unused Finco antenna gift cer-tificates-it shall be the sole right of The Finney Co.to dispose of or cancel said unused gift certificates.

12. All unused Finco antenna gift certificates shall becomevoid as of May 1, 1972. Gift certificates must be sub-mitted to an authorized Finco antenna wholesale dis-tributor on or before May 1, 1972.

RCA to Close ServiceAmerica TestOperations Immediately

RCA has announced the closing of its ServiceAmericaoperation established in three test markets last year to ser-vice all makes of TV sets and other home entertainmentproducts.

The operation had a total annual volume of approximately$1.5 million, RCA said. The company added that its resultsin the test markets do not justify the investment of manpow-er and other resources required to expand ServiceAmericanationally.

The ServiceAmerica centers were located in the Philadel-phia, San Francisco and Miami areas; and were reportedlyclosed by December 31, 1971.

RCA said that all customer obligations of ServiceAmer-ica will continue to be met.

ISCET Report StressesTechnician Pride

There are thousands of electronic technicians, most ofwhom service home entertainment equipment. Some arepoor, some are excellent, and others are in-between. Now,I don't propose that each one be identified by his attributeson a scale from 1 to 1000. But I do think that it is a verygood thing for the industry to set some minimum standards.This not only places a label of "qualified" on the techni-cian, it gives him dignity of accomplishment and providesthose coming up with a goal to shoot for. There are, ofcourse, many other desirable reasons and, to my knowledgefew, if any, objections.

The CET program has filled this need and is rapidlyspreading throughout the world. There should be just under3000 so qualified by this time. It has taken over 5 years toreach this point. I venture that this figure will double in thenext 12 months. Beyond that, I wouldn't guess, but you getthe idea. The test is constantly being revised and improved.Along with the proof of 4 years of practical training, it isa good indicator of a man's (or woman's) basic under -

54 IELECTRONIC TECHNICIAN/DEALER, JANUARY 1972

standing of electronics.In the near future, programs will be available to test ad-

vanced levels of achievement. This may give technicians theopportunity to qualify as a specialist in various branches ofelectronics, as well as advanced home entertainment equip-ment servicing. Actually, there is no limit to the heights ofthese achievements, only to the extent of man's mental cap-abilities.

Ed Schon, CET

Now, you may ask, whyshould anyone bother withsuch an inconvenience? Well,it's "pride." This is whatmakes a "professional," as setapart from an ordinary work-man. Not only does the em-ployer and the customer gainfrom a "professional" trade,but the technician himselfgains self esteem, self respectand self improvement. His in-come will be higher andtherefore his family will alsobenefit.

Beyond the point of seek-ing and attaining certification

and its many benefits, where can one go? That's whyISCET was created! It is truly an International Society ofElectronic Technicians, who come together for mutual aidand comfort. It is so beautiful to have the haven of mutu-ally interested people where common problems can be airedand often solved. A place where your personal knowledgecan be extended to help others. A place where, if youchoose, you may instruct or assist younger heads in thebusiness. Whether it be on a local basis or international,you will make lifelong friends and learn a bit yourself. Butmost of all, you will make known to the industry who youare, what you are, and contribute your piece to the growthof your chosen field, electronics.

There are several local chapters being formed and youmay want to be the sparkplug to get one started in yourarea. Why not? We did it quite spontaneously here in Ore-gon last July. It's a little work, but well worthwhile. If youneed some help, we'll give it gladly. But first, send in yourapplication for ISCET. Be forewarned, however, that accep-tance is not automatic. Your character must first be ap-

proved by a local NEA affiliate group. If you are interestedin ISCET, get going! Remember-think, act and work as a"professional." It pays.

Ed Schon, CETPublic Relations Committee, ISCET

Jerrold reports that 62 TV dealers and technicians attended its recenttwo-day basic MATV schoo,, conducted at the Hyatt Lodge in Minne-apolis, Minn. The first day of the school covered decibels, signal-to-noise ratios, minimum signal requirements, path loss, equipment pa-rame-.ers and applications. The second day started with a demonstra-tion of MATV system layo ft techniques, class participation in typicallayouts, head -end calculat.ons, amplifier selections adding CCTV andaccepting CATV feeds. According to Wendell Woody, Jerrold midwesternregional manager, the schcol was unusually effective in helping Minne-sota technicians cope with MATV problems.

Color -TV Set SalesContinue to Climb

U.S. manufacturer sales to dealers of TV sets, radiosand phonographs were ahead last September over salesduring the same month a year ago, according to the Elec-tronic Industries Association's Marketing Services Depart-ment.

More details concerning their report are shown in thetable.

TOTAL U.S. MANUFACTURER SALES

Television Sets

September1971 1970

Year -to -Date1E71 1970

B/W -TV Sets 542,108 492,388 +10.1% 3,437,674 3,171,341 + 8.4%Color -TV Sets 746,617 585,447 + 27.5% 4,074,502 3,236,842 + 25.9%

Total TV Sets 1,288,725 1,077,835 + 19.6% 7,512,176 6,408,183 + 17.2%

RadiosAM 434,326 560,934 -22.6% 3,358,255 3,407,289 - 1.4%FM 407,394 352,440 + 15.6% 2,647,225 2,144,820 + 23.4%

Total Home Radios 841,720 913,374 - 7.8% 6,0)5,480 5,552,109 + 8.2%Automobil: Radios 1,070,568 707,892 +51.2% 7,638,874 6,336,381 + 21.3%

Total Radios 1,912,288 1,621,266 + 18.0% 13,634,354 11,888,490 + 15.2%

PhonographsPortable Phonographs 362,734 322,902 +12.3% 2,254,462 1,830,084 + 23.2%Console Phonographs 116,757 131,725 -11.4% (.68,078 760,672 -12.2%

Total Phonographs 479,491 454,627 + 5.5% 2,922,540 2,590,756 + 12.8%

JANUARY 1972. ELECTRONIC TECHNICIAN/DEALER 55

TECHNICAL DIGEST

The material used in this section is selected frominformation supplied through the cooperation of therespective manufacturers or their agencies.

ADMIRAL

Tape Cassette-Service Hint

Tape cassettes have tabs in small slots (see drawing) thatcan be removed by the user to prevent accidental erasure orre-recording of the tape.

Some tape recorders are brought to service shops with a

complaint of "will not erase or record" because the userremoved the tabs.

If you get a tape recorder to service, first look for thetabs on the user's cassettes! If the tabs are removed try aknown good cassette before looking for further troubles.

RCA SALES CORP.TV Chassis KCS171-Circuit Modifications

The vertical mounted tube -type KCSI71 chassis has beencontinued in portable B/W -TV sets employing an 18 -in.diagonal screen. A KRK148 tuner is used for VHF tuningand a KRK152 tuner is used for UHF tuning. Althoughthe chassis continues with minimum changes, some hori-zontal sweep circuit modifications have been incorporatedin this version of the KCS171AB chassis.

A 18V 19V

C109 82 68CHO 560 470C130 82 68

L10382pH

V103DAMPER

ctioTA

mow TO PW 200-Z

The capacitive voltage -divider network in the flybackcircuit is changed by connecting a capacitor (C130) to the

junction of C109 and Terminal No. 2 of the flyback trans-former. With this capacitor arrangement, the high voltagecannot exceed the specified maximum voltage under a fail-ure of an open capacitor in the voltage divider network.Early versions of this chassis had a capacitor connected tothe junction of C109 and C110. With that arrangement, anopen C109 capacitor could have caused the high voltage toexceed the maximum limits. The value of these capacitorsvary for 18 -in. to 19 -in. diagonal screen. The appropriatevalue is given in the table accompanying the schematic dia-gram.

The low -voltage filter capacitor (C101) is a new high -reliability type specially designed to prevent internal short-ing of the positive plates. As a further precaution against

B+140V

R11239

C101A C101B+250)J F - 650)J F200V 175V

shorting, heat shrinkable tubing is used on the capacitorterminals to prevent external wiring shorts.

Another significant circuit change is the connection ofone end of the HORIZONTAL HOLD control to ground. In

V207HORIZ.

OSC

1R2711K

C256 C261

390 68

R 27562K

R118 A60K =

HORIZ HOLD

some earlier KCS171 chassis, this side of the hold controlwas connected to a horizontal oscillator disable circuit,which produced a non -viewable picture should a failure oc-cur. Since these changes prevent the high voltage from in-creasing above the specified limits, the disable circuit is nolonger required. Should the need arise to replace any of thespecially designed components mentioned, do so with anexact replacement type.

56 I ELECTRONIC TECHNICIAN/DEALER. JANUARY 1972

COLOR FAX

The material used in this section is selected frominformation supplied through the cooperation of therespective manufacturers or their agencies.

MAGNAVOXColor TV Chassis T938-Installing Replacement High -Voltage Trans-former 361328-1

TO /5V104- SAWS LOS

Won OUTPUT1,10 4000

.0.011

Transformer No. 361328-1 is the recommended replace-ment for the 361241 transformer used in the early produc-tion chassis. When installing this transformer, be sure thatterminals C and D on the transformer are connectedthrough a jumper wire.

DEFLECTION BOARD

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The chassis employs a Horizontal Centering circuit(Diode and Resistor with solderless connectors for adjust-ment). These may not be shown on your copy of the T938schematic diagram; if so, please add them. Failure to makethe proper connection between terminals C and D will re-sult in apparent normal operation, however, the transformerwill be operating at excessive temperatures.

Color TV Chassis 7918-Installing Replacement High -Voltage Trans-former 361328.1

Transformer 361328-1 is the recommended replacementfor the 361241 transformer used in the original production

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chassis. When installing this transformer be sure that ter-minals C and D on the transformer are connected througheither a jumper wire or a 6.851, 1w resistor.

If the chassis employs a Horizontal Centering circuit(Diode and Resistor with solderless connectors foradjustment) terminals C and D must be connectedwith a short jumper wire.

If the chassis does not employ the centering circuit,terminals C and D must be connected through a 6.811,Lw resistor.

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CIRCUIT WITHOUT HORIZONTAL CENTERING

These connections may not be shown on your copy of theT918 schematic diagram; if so, please add them. Failureto make the proper connection between terminals C andD will result in apparent normal operation, however, thetransformer will be operating at excessive temperatures.

Remote -Control Receiver Model 704069-Addition of Current LimiterResistor

It has been found that an arc in the picture tube of acolor -TV set with a 704069-1 remote control receiver cancause a high -amplitude transient pulse to appear at the basecircuit of transistor Q13 in this receiver. In some instances,the current produced by such a transient is sufficient to de-stroy the transistor. Because of this, a current -limiting resis-tor is installed in series with the base of Q13 in all late pro-duction units. If an early production remote control not

or1 71:1 VOLUME 05 OF20$.594 560

[jL' _ $. AUTOOf.500

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having such a resistor in series with the base of Q13 is en-countered, one should be installed. This can readily be ac-complished by cutting the foil between the base of Q13 andPin 19 of the edge connector and then bridging the cutwith a 1K resistor.

The exact value of the resistor is not critical. Individualvalues of 10011 and 1K have been used for this applicationin production; however, for field modification, the 1K val-ue is preferred.

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Color -TV Chassis T946-AGC Control Added

An AGC control has been added to the T946 chassis, Bproduction. The control, Part No. 220217-5, is a 1.5K po-tentiometer with a blue adjustment wheel. The control

continued on next page

JANUARY 1972, ELECTRONIC TECHNICIAN/DEALER 157

Why pay an answeringservice when you can

own your own?Dictaphone has a machine tomake sure you never lose an-other cent through a missedphone call or a garbled mes-sage. In fact, we have a wholeline of them.

They're called Ansafones. You can buy one outrightor possibly lease it for about what you're paying youranswering service now. And it works for you 24 hours aday, 7 days a week.

For a free brochure describing how much anAnsafone can help you, mail this coupon now. o

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Please send me full details of the Ansafone line.Name

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Ansafone and Dictaphone are registered trademarks of Dictaphone Corp.. . . for more details circle 106 on Reader Service Card

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Nobody but Eico makes the troubleshooting of solid stateequipment so quick, easy, versatile and precise for the pro-fessional electronics technician and engineer-and at suchlow cost! Dynamically tests transistors in and out of circuit. Performs the 4 basic tests on all types of FETs

including pinch -off. Performs the 3 basic tests on all types of bipolar transistors. Tests for true transconductance and AC Beta,

in and out of circuit. Tests all types of diodes and measures zener voltage. Tests SCRs, TRIACSs, and UJTs. Incorporates easy -to -use DC Voltmeter and Ohmmeter. 50 uA taut band meter movement.

FREE 32 PAGE EICO CATALOGFor latest catalog on EICO Test Instruments, Stereo, EICOCRAFTProjects, Environmental Lighting, Burglar/Fire Alarm Systems,and name of nearest EICO Distributor, check Reader ServiceCard or send 250 for First Class mail service.

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COLORFAX."continued from page 57

physically replaces the fixed resistor (R50), which wasused in earlier production chassis. This control should beadjusted to produce minimum snow on the weakest chan-nel available. The strongest station should then be observedto insure that AGC overload is not present. If overload ispresent, readjust the control to just eliminate the overloadcondition.

Color -TV Chassis 1924/1939/1950-Reduced High Voltage Caused byLeaky Zener Regulator Diode

The illustration is a simplified diagram of the high -volt-age regulation circuit used in color -TV receiver chassisT950. Except for the circuit symbol numbers, this circuitis the same as that used in color -TV chassis T924 andT939.

A regulated 200v reference potential at the HIGH -VOLT-

AGE control (point A) is maintained by zener diode Z602-this potential variable over a range from about 88v tothe full 200v present at the cathode (point B) of diode

.250V

Tortialiafroianiinka

M350534 MK470K

D503. The voltages present at the cathode of D503 deter-mines the amount of the negative charge developed at itsanode by capacitor C530 during each horizontal pulse. Theresulting negative voltage is divided across resistors R534and R535, and applied as negative bias to the horizontaloutput tube grid. The amount of this bias determines theconduction of the tube and as a result the amount of highvoltage. As the bias at the horizontal output tube grid be-comes more negative, the high voltage reduced and viceversa.

If diode Z602 becomes defective, the high voltage is af-fected. If the diode opens, the potential at point A risesslightly and results in a very slight increase in high voltage.However, if the diode becomes leaky or shorts, the poten-tial at point A decreases, causing an increase in negativebias at the horizontal output tube grid. An increase in thisnegative bias results in reduced high voltage, accompaniedby decreased screen brightness and a narrower raster. Thedegree of reduction of high voltage, brightness and rasterwidth can range from very slight to severe, depending onthe degree of leakage in diode Z602.

GENERAL ELECTRICColor -TV Chassis KE-Low-Resistance Contrast Control

In the KE and KE-II chassis there is a 6AG9 video am-plifier tube (V6A) which upon failing can produce exces-sivt; cathode current. This may burn a spot on the CON-TRAST control (R103) changing its resistance to 20011and 300,11 with a corresponding reduction in cathode bias.

Past practice has been to change only the 6AG9, since. . . for more details circle 107 on Reader Service Card

58 I ELECTRONIC TECHNICIAN/ DEALER, JANUARY 1972

control R103 was not suspected of being defective. Whenonly the 6AG9 is changed, the picture will bloom and pullin at the sides at maximum brightness and contrast-evenwith the picture tube bias at minimum. The pull -in iscaused by the loss of high -voltage regulation. Even underthese conditions, a reasonably good picture usually can beattained by readjusting the picture -tube bias and gray scale,but the adjustments are critical.

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The correct procedure, when replacing the 6AG9 videoamplifier tube, is to measure the value of the CONTRASTcontrol (R103), replacing the control if it measures 2908or lower.

One possible cause of 6AG9 tube failure is the positionof a wire support. A stiff steel wire support extends upwardfrom the KE circuit board near Pin 12 of the 6AG9. Thissteel wire has a loop at the top which supports an insulatedlead. In many cases the steel wire support touches the glassenvelope of the 6AG9 and causes an extremely small holein the glass, resulting in loss of vacuum. This type of fail-ure may account for the excessive current through the6AG9 and the burned spot on the CONTRAST control.

Whenever you service a KE color -TV chassis or replacea 6AG9, bend the steel wire support away from the 6AG9so that no part of the support touches the glass envelope.

Remember a high -voltage power supply fault can createa problem similar to that caused by the defective CONTRASTcontrol, with respect to blooming and picture pull -in orpoor regulation. This of course can involve improper drive,the hold-down circuitry, poor regulator tube efficiency,high -voltage adjustment, and so on.

A good indication of the overall condition of the high -

voltage power supply can be obtained by measuring theregulator cathode current and adjusting the high voltageto that recommended in the service manual. If the regula-tor cathode current is less than 0.9ma with the BRIGHTNESS,CONTRAST and CRT BIAS controls at minimum, then you cansuspect that there is a problem in the high -voltage powersupply.

Comments from our readers are always welcome.Address your letters to:

Phillip Dahlen, EditorElectronic Technician/Dealer1 East First StreetDuluth, Minnesota 55802

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EICO, 283 Malta Street, Brooklyn, N.Y. 11207 EICO... for more details circle 107 on Reader Service Card

JANUARY 1972, ELECTRONIC TECHNICIAN/DEALER 59

NEW PRODUCTS

For additional information on products described in this section, circlethe numbers on Reader Service Card. Requests will be handled promptly.

TUBE TESTERFeatures 10 pin eliminationswitches

703

The Mighty Mite VII tube testerfeatures 10 pin elimination switches.With the pin elimination switches, up

to 10 pins can be isolated from test bysetting the switches for the pin or pinsto be isolated. Grouped together formaximum convenience, the switchesare of the simple slide type, and may

REPLACEMENTPARTS &

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be set and reset individually, or all atonce by pressing a reset slide. TheTC162 unit is housed in a brushedsteel and vinyl -clad case, and includesa complete setup book. Price: $99.50.Sencore, Inc.

MAGNETIC NUTDRIVERS 704

Magnet in the socketholds fasteners firmly

A magnetic feature is being offeredon midget pocket clip, regular, extralong, and super long fixed handle driv-ers and also on interchangeableshanks for use with all Xcelite Series99 handles, both regular and ratchettypes. An Alnico permanent magnetinserted in the socket holds most fas-teners firmly for easy, one -hand start-ing, driving, or retrieving hex screws,bolts, and nuts, in close quarters and

'

4' 40IPethilaintoOW" e 4

hard -to -reach places. The magnet isinsulated so that the tool socket itselfremains unmagnetized and will not at-tract extraneous matter or be deflect-ed by nearby metal surfaces. Nutdriv-er sockets are reportedly speciallytreated and hardened to withstandsevere service, such as the driving ofhex head self -tapping screws. They arefinished in black oxide for dimension-al control as well as for quick identi-fication as magnetic tools. Fixed han-dle drivers have color -coded plastichandles in a new comfort -contour de-sign. Xcelite Inc.

CIRCUIT LINE EXTENDER 705

Employs hybrid circuitryfor improved performance

The new SLE-300A is a push-pullline extender that employs hybrid in-tegrated circuitry for improved per-formance in both 30v and 60v sys-tems. It reportedly achieves 25dB am-plification over the frequency spec-trum from 40 to 300MHz. Specifiedfor 30 channel operation, the line ex-tender has a minimum rated output

. . . or more details circle 129 on Reader Service Card

60 ELECTRONIC TECHNICIAN/DEALER, JANUARY 1972

capability of +44Bmv per channel at-57dB cross mod. At 46dBmv out,specifications indicate that the second

o(1)

ebb,

.1

order beat is -66dBmv, while thetriple beat is -70dB. In addition, theSLE-300A contains AGC circuitry forsloped automatic gain control. Price:$245.00. Jerrold Electronics Corp.

PLUGS AND CABLES 706

Designed to fit manyEuropean phonographs

A series of plugs and cables hasbeen designed to fit many Europeanphonographs. The plugs and cables,known as Series W-HOS, consist ofthree types. Model W-HOS-1 is a 5pin DIN European plug to 4 RCA

phono plugs. The 3 pin DIN Europeanplug to 2 RCA type phono plugs ismodel W-HOS-2. W-HOS-4 is the 72 -in. pin plug to 3 pin plug. All three inthe series are compatible for use withNorelco, Telefunken and many otherEuropean lines. Weltron Co.

PHONO CONNECTORS 707

Designed to simplify yourprinted -circuit maintenance

There may be occasions when youwill encounter printed circuit boardsin TV sets or audio components whichcontain a loose or defective phono-graph -type socket. In anticipation ofsuch circumstances, you may wish tostock a supply of these sockets for re-placement use. These sockets, avail-able at parts distributors across thecountry, are said to be designed for

continued on page 62

Search Continues for Loch Ness MonsterMany of our readers have in the past indicated an interest in sonar, those near the ocean, large riversand lakes having sold and serviced units des;gned to measure water depth or indicate the presence of fish.Recently MartIn Klein, president of Klein Associates, Inc., prepared a paoer telling of another veryinteresting sonar application-the search for Scotland's elusive Loch Ness monster.

-- 700 rneNFS -

KLEIN ASSJCIATES. INC.uNDLR91.4 51.1,4SALEM NEW FIAMASHISE U S A

SIDE SCAN SONARMODEL MK -200

SLOPE TOPOGRAPHY

LOCH NESS, SCOTLAND

LARGE M DWATER OBJECT

BOTTOM AND SLOPE TOPOGRAPHY

LOCH NESS, SCOTLAND

I he use of sonar is not new toLoch Ness. In 1968, a group fromthe University of Birmingham usedan experimental digital sonar sys-tem, which detected a possible mov-ing object in the Loch. In 1969,Robert Love used a mechanicallyscanned mobile sonar and again de-tected a possible large moving ob-ject.

Although it cannot produce anactual picture of a target at longrange, side scan sonar has had anenviable record of success in locat-ing objects on the sea floor. It useshigh -intensity, low -frequency sound,projected in the water in a beam thatis narrow in the horizontal planeand wide in the vertical plane. Thesound pulses echo off objects in thewater or on the bottom, and theecho energy returns to the transduc-ers, where it is converted to electri-cal signals, which are continuouslyand permanently recorded on a stripchart.

Using a standard Klein Associ-ates, Model MK -300 Side Scan So-nar, which uses a 50kHz audio fre-quency, 0.1ms pulse length and 2°horizontal scan width, some passeswere made across the Loch andothers parallel to the walls of theLoch-the transducer assembly be-ing towed about 100 ft under waterto get beneath the thermocline.

The resulting records reveal someof the spectacular geology of thesteep walls of the Loch. The photosin this article shows some of themore interesting traces. Note thatthe long dark sections are apparent-ly highly reflective ridges, while thelong light sections are areas wherethere is a depression or undercut,which gives no signal return. Unfor-tunately, the actual depth of thesedepressions cannot be determined,but they appear to be certainly wideenough to be able to harbor largeanimal life.

In some areas the sonar pickedup echoes above the bottom that

continued on next pageKLEIN ASSOCIATES. INC.

1.604 ..... /NS ARCM AkIASALEM MEW HAMPNIE U SIDE SCAN SONAR

MOOSIL MK -300

"STAR -TRACK"" the mostAdvanced Space -AgeVHF/UHF/FM ColorAntennas ever introduced!

Similar designto antennasused in spaceprogram.

U.S. PatentNo.

Corner Reflector Driven Disc Director Array for totalUHF coverage!

Multiple Tuned, Cut -to -Channel VHF Elements for totalVHF and FM coverage!

Maximum construction for long installation life! Exclusive Reynolds Aluminum COLORWELD durable

baked enamel Gold finish! Includes RMS SP -332 VHF/UHF Splitter for economical

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ModelRANGE OF RECEPTIONVHF UHF

SK -716SK -1117SK -1519

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Up to 50 milesUp to 125 milesUp to 150 miles

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RMS ELECTRONICS, INC.50 Antin Place, Bronx, N.Y. 10462Tel. (212) 892-6700

... for more details circle 127 on Reader Service Card

LOCH NESS...continued from page 61

appeared to be fish. Sometimes theseechoes appeared in "clouds" whichwere apparently schools. On a fewoccasions they indicated larger ob-jects in midwater, but it is difficultto judge the nature of these objects.They are, however, real echoes, sothey are presented here as observa-tions without further comment.

The brief side scan sonar testsproduced three important discover-ies: There are large moving objectsin the Loch; there is abundant fishlife in the Loch, which could sup-port a large creature; and there arelarge ridges in the steep walls of theLoch, which could conceivably har-bor large creatures.

In his paper, Martin Klein ex-presses indebtedness to The Acad-emy of Applied Science for support-ing the work at Loch Ness and toTim Dinsdale, Robert Love andother members of the Loch Ness in-vestigation team for their open-mindedness and their enthusiasticcooperation.

NEW PRODUCTS...continued Irvin page 60

simplicity and to consist of merely anouter shell, an insulator and an innershell-the outer shell being designedwith tails to go through the printed -

circuit board to allow maximum spac-ing between the center hole and tabs,thus preventing solder bridging. Wal-dom/Molex products, Molex ProductsCo.

REPLACEMENT PICTURE TUBE

90° RIM band, Einzel 708gun tube

A new Hi-Lite color TV -picturetube has been added to RCA's line ofreplacement tubes. Type H-19VBQP-22 is a 90°, RIM band, Einzel gunMatrix tube. The price is $178.00each. RCA Distributor Products.

MIDGET RATCHET KIT 709

Precision made toinsure proper fit

A 20 piece reversible ratchet setdesignated as No. 4320 contains a 20tooth ratchet, an extension, 12 Allen -hex drivers from .050 in. to 5/16 in.,two regular slotted -head drivers in 1/4 -in. and 3/4 -in. sizes, two Phillips -typedrivers in sizes 1 and 2. and a square

adapter for 1/4 -in. drive sockets. hedrivers are reportedly constructed ofchromenickel molybdenum alloy steel.They are said to be precision made toinsure proper fit. Dual-purposeknurled spinner tops allow for quickfinger tightening of threads. A specialpop -out feature quickly ejects driversfrom the ratchet. The ratchet is madeof stainless steel, and its short 18° arc

makes it desirable for working in closequarters. Reverse action is obtained bysimply turning the ratchet over. Thekit is packaged in a vinyl pocket -sizedsoft pouch with snap closure. Price:$11.00. Jensen Tools and Alloys.

OSCILLOSCOPE 710

Enables preciseinterpretations

The Model 572 oscilloscope is in-tended for special applications wherehigh legibility is a critical requirement.It reportedly contains carefullymatched, highly sensitive dc amplifiersand balanced attenuators for each axis,permitting phase comparisons andmeasurements with small error. Thescope has a large viewing area of 10cmby I2cm on a 7 -in. CRT display tube.

Sensitivity is better than 20mv/cmwith a bandwidth of about 2Hz to600kHz -3dB, plus a sweep range ofI Hz to 100kHz. The model weighs 30lb with physical dimensions of 91/2 -in.W by 131/2 -in. H by 20 -in. D. Price:$589.00. Kikusui Electronics Corp.

PRECISION TWEEZERS 711

Made of non-magneticstainless steel

Tweezers of non-magnetic stainlesssteel with heavy strong points are

available in two styles-one madewith serrated points, the other ofsmooth points. The overall length is

434 in. EREM Corp.

62 j ELECTRONIC TECHNICIAN/DEALER, JANUARY 1972

GUEST AUTHOR...continued from page 51

change. So, just as the wise techni-cian prepared for color in the hey-day of B/W -TV servicing, so musthe now prepare for solid-state ser-vicing.

While I am not in the habit ofadvising service dealers as to howthey should run their business, goodbusiness judgment dictates that nowis the time for the ambitious servicetechnician to update his solid-stateknowledge, or to get some basic in-struction-if he hasn't done so al-ready. In this way, he will be pre-paring to meet the changing needsof tomorrow as he reaps the bene-fits of today's business potential.

Several avenues are available forthis purpose. For example, TV-setmanufacturers offer solid-state ser-vicing seminars on their own prod-ucts. For beginners, the ElectronicsService Committee of the Electron-ics Industry Association offers work-shops, which include solid-state cir-cuitry.

Service associations frequently of-fer training sessions or seminars fortheir memberships. A wide varietyof literature on many phases of sol-id-state electronics is available fromthe technical publishing industry,and periodicals such as ELECTRON-IC TECHNICIAN/DEALER frequentlypublish helpful articles on the sub-ject.

From personal knowledge I cantell you of solid-state handbooks,manuals and audio-visual instruc-tional aids now available from au-thorized RCA distributors as well asservice meetings sponsored by themfrom time to time. I am sure thatother manufacturers also makeavailable their own versions of solid-state instructional material.

In summary, I am reminded of aLatin phrase that has stayed withme through the years-"CarpeDiem!"-"Grasp the Opportunity!"For the opportunity is here and now.

As I see it, the smart service deal-er or technician will continue to doall he can to get a good share of to-day's available business at a profit.And, if he is really on the ball, he ispreparing for the day when solid-state components will be a big partof the big servicing business. He isgrasping the opportunity, "makingit" in today's market-and gettingready to keep on "making it" in themarkets of tomorrow and beyond.

PULL OUTthose

troublesomevacuum

tubesPLUG_the all new,all solid-statetrouble -freeSOLID -TUBES

* High Voltage Rectifier,Damper DiodeFocus Rectifier

Add to your profits - GO SOLID STATE!Pule out those three troublesome vacuum tubes and simplyplug-in EDI all solid-state SOLID -TUBES ... R-343 (orR-3AT2), R-2AV2 and R-DA'4.install EDI SOLID -TUBES and you prcvide your customerswith the same proven EDI tecnnology used in our mass pro-duction of rectifier modules for one of the largest maiufac-turers of color TV receivers.

SOLID -TUBEType Number

Replaces Vacuum TubeType Number

R -3A3 High Volt Rect 3A3, 3AW3, 3B2, 3CA3, 3CN3, 3CU3,3C23, 2CN3, 183, 1G3, 1K3, 113

R-3AT2 High Vol! Pect 3PT2, 3AW2, 3BL2, 38M2, 38N2

R-2AV2 Focus Rect 2P,V2, 1V2

R-DW4 Damper Diode 6DW4, 6CK3, 6CL3. 6BA3

The all new, all solid-state, EDI SOLID -TUBES.

.. insure high -eliability and longer Ire,. . cut down on troublesome call bacKs and dissatisfied

customers,... help eliminate burn -outs and one potential source of

X-radiatioi.Order your EDI SOLID -TUBES from your rearest parts

cistributor or call us collect.

ELECTRONIC DEVICES, INC.21 GRAY OAKS AVE YONKERS. N Y 10710TELEPHONE 91.9654400 TELETYPE 710 960 0021

. for more details circle 109 on Reader Service Card

JANUARY 1972, ELECTRONIC TEChNICIAN! DEALER 63

ele alkPROFESSIONAL COLOR TV

SERVICE EQUIPMENT

ECONO JIGColor Test Jig

jlOjain%

$4095 Net Complete with %I less tube

all components and cables. Durable metal cabinet. Professional equipment

for rapid servicing.

ADAPT-ALLSYoke Convergence Adaptors

lleSilks\,*

To service all sets.. with any test jig.

;41b. FREE: Write for cross-reference listingthousands of sets.

TRANSVERTERSService Solid State TV

On any make test jig withsimple plug-in Transverter.

MOLEX CUSTOMCABLE KIT

Make all combinationsof Molex Cables

CR-596 contains: 47..?:7,-7-1: .

Assortment ofMolex Plugs :1.--. ---

.,... re.and sockets. :-z. ,

18 wires,contactsattached. -4- .

Extractor.1'

.,tool.

--------:_

TELEMATIC DIV., UXL CORP.2245 PITKIN AVE., BKLYN., N.Y.11207

DEALER SHOWCASE

For additional information on products described in this section, circlethe numbers on Reader Service Card. Requests will be handled promptly.

RADIO TRANSCEIVER 712

Designed for rough treatmentin all-weather

A rugged hand-held radio transceiv-er, this solid-state unit is reportedlyfully compatible with all high -band

VHF -FM two-wayradio communica-tions system over afrequency range of132 to 174MHz.Weighing only 30 ozwith battery and en-cased in high -impactLexan, the water-re-sistant transceiver isdesigned especiallyfor rough treatmentby men on the movein all-weather out-

door jobs. Front and back access cov-ers of the unit are die-cast high -strength aluminum. The radio is saidto provide the user with immediateand direct voice contact with base sta-tions, mobile units and other portabletransceivers. The radio's circuitry is

segmented into solid-state, plug-inmodules for high -reliability operationand for fast, easy maintenance. Aproblem circuit can be pulled out anda fresh module plugged in, with an av-erage repair time of approximately 8min. Designed for low battery drain-age, the transceiver can operate offeither a 15v nickel cadmium battery ora I 6.8v mercury battery. Standard op-tions reportedly offered with the newhand-held radio include up to fivetransmit and receive channels, exter-nal mike -speaker, head -set, a choice ofthree antennas-telescopic (standard),flexible whip or railroad spiral. Ham-marlund-DuMont Mfg. Co.

Angola

00 MONT

AMPLIFIER 713

Serves as a sound mixerand comparison device

In addition to its primary functionas an ultra -low -distortion stereophoniccontrol amplifier, the Hitachi 1A-1000serves as a sound mixer and a com-parison device for associated compo-nents. It employs silicon transistorsand integrated circuits in the equalizerstages for low noise, linearity and sta-bility. Its total harmonic distortionmeasured at full rated output of 140wis said to be 0.1%, feeding into an 8i1

load. The preamplifier/control sectionincludes a front panel INPUT and GAIN

control for a dynamic microphone,permitting mike mixing with otherprogram sources. Switch -step -typeTONE controls, separate for bass andtreble, operate within a range of-± 12dB, boosting and attenuating thefrequency extremes while leaving the

center range unaffected. Rear paneloutputs include four pairs of mainspeaker terminals. Two front panelswitches permit the use of two sets ofspeakers, separately or simultaneously.The unit measures 175/8 in. W by 53/sin. H by 13 in. D. Suggested list priceis $319.95. Hitachi Sales Corp.

TURNTABLE 714

Eight -pole synchronous motorcontributes to low wow and flutter

The PL -4I D is a two -speed, belt -driven stereo turntable utilizing a stat-ic balance pipe tonearm. The heart ofthe unit is an eight -pole hysteresis syn-chronous motor whose speed, half thatof a conventional four -pole motor, issaid to contribute to the turntable'slow wow and flutter, with practically

complete freedom from vibration. Thetonearm is an S shaped pipe type, per-forming at both vertical and horizon-tal angles with a rated tracking errorof 0.17"cm and a tracking force rangeof 0.4 to 12 grams. Another importantfeature is an overhang indicator,

. for more details circle 131 on Reader Service Card

64 I ELECTRONIC TECHNICIAN/DEALER. JANUARY 1972

which allows the user to match the tipof the stylus to the correct record po-sition, preventing distortion and inade-quate channel separation of stereo re-cordings. The PL -41D has an inducedmagnet type cartridge with a ratedwide frequency range of 10Hz to25kHz. Price $220.00. U. S. PioneerElectronics Corp.

WIRELESS RADIO MIKE 715Full -fidelity soundfree of mike booms

The ORATOR model wireless mi-crophone system reportedly providesfull -fidelity sound amplification free of

mike booms,stands or trailingwires. The systemconsists of a bat-tery -powered mi-crophone / trans-mitter and a smallreceiver. The re-ceiver has 3 out-puts for compati-bility with any PAsystem, tape re-corder or micro-phone mixer. In

use, the 3 oz microphone may behand -carried or placed in lavalier po-

for attachment to a belt or sash, or itcan be placed in a shirt pocket ortaped to the body. The receiver, withits antenna, is easily concealed behinda partition or drape. Vega Electronics.

RECORDER 716

Low -noise cassette recorder withglass and crystal ferrite head

The GXC-40D, a new cassettestereo tape recorder, representsAKAI's commitment to the crystal fer-rite head in recorders. In addition to

playing regular tapes, a special biasswitch allows the unit to pick up thebroader frequency response (withhigher signal to noise ratio) of the newchromium dioxide tapes. An over -levelswitch activates a low -noise circuit thatreportedly cuts distortion to 1.5%.The unit is equipped with piano key

controls, a PAUSE button for editingtape, left and right VOLUME slide potcontrols, a TONE control, a three -digitcounter and two VU meters. It alsohas a hysteresis synchronous outer -ro-tor motor giving stable tape travel andideal starting torque. A newly designedflywheel and capstan shaft is said toreduce wow and flutter to a new lowin cassette machines. AKAI America,Ltd.

TAPE CONTROL SYSTEM

Automatically turns OFFat end of any tape

The Model 550 Servo-Matic is aservo -mechanism that reportedly turnsOFF all Hi-Fi components at the endof any tape, turns OFF all compo-nents if a tape stalls or jams during op-eration, and turns itself OFF when thetape stops. A miniature low -voltageswitch can be installed inside any taperecorder to feed the motion sensingcircuit, while the Servo-Matic moni-tors the operation of the tape recorder

717

or deck. The unit comes in a moldedcase with an in -line control group thatis recessed in a vinyl walnut woodgrain plate. Price of kit: $22.50, fac-tory wired: $35.00. Cymax Audio Ac-cessories.

TWO-WAY ANTENNA SYSTEM

Designed for easy 718attachment

The Model DFG "Double -Talk" an-tenna system is designed for easytachment to current and newstyle rain gutter trim withoutdrilling, and accommodatesstyle and change where many1972 car designs dictate lim-ited antenna mounting loca-tions. Dual antennas report-edly offer superior signalcoverage and extended range.The two copper armored.white -vinyl -covered 43 -in. an-tennas, come complete withmounting hardware and spe-cial coaxial phasing harness.New-Tronics Corp.

at-

/ The rightreplacement, fasterwith n NEW

SERVICE

KITS

from your CentralabDistributor

KITS AVAILABLE:

Fastatch II Controls

Miniature Wirewound Controls

Miniature Trimmer Controls Axial Lead Electrolytics PC Lead Electrolytics

General Purpose Capacitors

High Voltage Capacitors

Packaged Electronic Circuits

KIT FEATURES:

Rugged steel frames with highimpact plastic drawers. Stackable or wall mounted.

Portable, with convenient handles.

All contain assortment of themost popular and widely usedCentralab components.

All control units (KIT -10F, -20W,-30T) include latest edition of H. W.Sams Replacement Control Guide.

All components are functionallyarranged in drawers by value,type, etc.

All drawers are pre -labeled clearlyshowing contents.

All kits are completely set up,ready to use.

By Centralab, yourParts -Time Helper

DISTRIBUTOR PRODUCTS

Ak'RN774

CENTRALAUf lectrontts ChvisoonGLOBE -UNION INC

. for more details circle 105 on Reader Service Card

JANUARY 1972. ELECTRONIC TECHNICIAN,'DEALER 65

Melted solderdisappears uphollow tipinto tube

The ENDECO Desoldering IronRemoves Soldered Componentsin seconds...without damage!Endeco melts solder; removes last traceby vacuum. Leaves terminals andmounting holes clean. Resolders PCboards better than regular iron. One -

hand operation. Temperature controlledfor continuous use. Standard tip furn-ished, 5 other tip sizes. Pays for itself.$20.65 net. Smaller size available. Seeyour distributor or write:

ENTERPRISEDEVELOPMENTCORPORATION

5127 E. 65th Indianapolis, Ind. 46220.. for more details circle 110 on Reader Service Card

`No-Noise'ProductsWork Like _Magic!

For Color 1011111IC'

and B/W MI SUPER wit- LUKE

Concentrated formulafor heavy duty jobs.Foams away corrosion.dirt, oxidation and

of polishes all tuners with-out drift or detuning.Avoid call-backs.

"No -Noise"products are

guaranteed non-flammable,no carbon

tet, non-toxic, safe

for plastics.

mowVolumeControl&Contact

4,2x224220.*

Restorer 41LUMECONTROL

Cleans, lubricates, re- "01:0°.stores volume controls. CONTACT

push button assemblies, RESTORE

band switches, relays *ammoll!Iand other electri-

cal contacts.Manufacturers of These Other

Famous "NO -NOISE" Products:Tuner -Tonic EC -44 Super Spray Bath

Frigid -Air Tape-Reco Head Cleaner

Ultra imitated jut fllI'cr duplicatedELECTRONIC CHEMICAL CORP.813 Commurupaw Avenue Jersey City, N. J. 07304

... for more details circle 108 on Reader Service Card

66 ELECTRONIC TECHNICIAN/DEALER, JANUARY 1972

TECHNICALLITERATURE

Kit CatalogThe new 1972 Heathkit catalog de-

scribes Color -TV sets with built-in ser-vice equipment, organs, ham radiogear, service and testing instruments,kitchen appliances, a table -top roadracing layout and modular electronicworkshops-designed for children.Highlighting this catalog is the AR -1500 AM/ FM/ FM -stereo receiver.Heath Company, Benton Harbor,Mich. 49022.

General CatalogApproximately 10,000 catalog items

are described in a new 64 -page generalcatalog. Among the items describedare batteries, capacitors, controls, re-sistors, semiconductors, switches andtimers, plus new security systems, cas-sette recorders and cassette recordingtapes. Mallory Distributor ProductsCo., 101 South Parker, Indianapolis,Ind. 46201.

Test Equipment CatalogDynascan Corp. has a catalog of B

& K precision test equipment for elec-tronic servicing, school, laboratory andindustrial applications. It presents 21instruments encompassing a widerange of equipment from a 100% mu-tual conductance tube tester to a dc to10MHz triggered -sweep scope. Nu-merous accessories such as probes andadapters are also featured. Each prod-uct page provides full descriptive de-tails of applications and specificationsalong with charts and patterns. Copiesof the BK2 catalog are available fromDynascan Corp., 1801 W. Belle PlaineAve., Chicago, Ill. 60613.

Components CatalogA 19 -page catalog of sockets, ac-

cessories, plastic components, transis-tor pads, socket adapters, miscellane-ous plastic products, heatsinks, andheat transfer washers, plus price listis offered by Jermyn Products, Bor-deaux Industries Inc., 712 Montgom-ery St., San Francisco, Calif. 94111.

Replacement Parts CatalogA 20 -page catalog of replacement

capacitors contains descriptive infor-mation and rating charts for electro-lytic, paper/film, ceramic, and mica

capacitors. Listings include the valuesfor the servicing of radio and TV sets,hi-fi stereo components and otheraudio equipment, amateur radio andhearing aids. Also included is a sec-tion on popular decade boxes featur-ing four resistance decades, three ca-pacitance decades and four inductancedecade units. Aerovox Corp., 740Belleville Ave., New Bedford, Ma.02745.

Radio Antenna CatalogA new business radio antenna cata-

log contains a number of antenna sys-tems designed to meet the growing re-quirements of the two-way radio mar-ket. Hy -Gain Electronics Corp., R.R.No. 3, Lincoln, Nebraska 68505.

Transistor CatalogA 130 -page transistor catalog pro-

vides data for NPN and PNP small -signal transistors, field effect transis-tors and pro -electron types. In addi-tion to specifications, the catalog pro-vides process design/application dataand test limit information. A glossaryof terms and package outlines is alsoprovided. National SemiconductorCorp., 2900 Semiconductor Drive,Santa Clara, Calif. 95051. Atten:Marketing Services.

ERATTA

The Magnavox Automatic Tint(ATC) circuit described in the No-vember Teklab Report, page 41, wasin error. This circuit, shown in Fig. 4,is employed in the T958 chassis. TheATC circuit used in the T962 chassisis basically the same deluxe circuit thatwas used with the T951 chassis-with-out the transistor in the cathode circuitof the color demodulator tube. The

I '

I

, 20.642

so

function of this circuit does not effectthe gray scale setting; therefore, thechromatone circuit used with the T951chassis is also used in the T962 chassis.

The correct ATC circuit used inthe T962 color -TV chassis is shown inthe partial schematic.

TEKLAB REPORT ...continued from page 42

switch signal is removed and theswitch shuts oFF to protect thepower supply from damage.

The SCR will remain oN until allpower is removed, which means theTV set will have to be turned oFFwith the ON/OFF switch. The SCRwill then be non-conductive and willallow the power supply to operatewhen again turned ON.

Power Supply AdjustmentsThere are two adjustments on the

power supply panel which are fac-tory pre-set, requiring no field ad-justments. The "pot" type regulatorcontrol adjusts the proper outputvoltage and the regulator sync levetcoil adjusts the sync level to the os-cillator stage.

Sync and Vertical Sweep Circuits

The sync separator on the verti-cal VA panel recovers the necessarysync pulses from the incoming com-posite video signal and stabilizes thevertical oscillator. A sync inverterstage applies the horizontal sync tothe horizontal circuits.

The vertical blocking oscillatoroutput is coupled to the pre -driverstage and direct coupling is usedfrom the predriver to the verticaloutput. The two output transistorsmake use of complementary sym-metry circuits and provide outputdirect to the deflection yoke, elimi-nating the vertical output transform-er.

Some of the vertical output iscoupled to the small vertical conver-gence transformer, which suppliesthe HA convergence panel with en-ergy for dynamic convergence.

Horizontal Sweep and HighVoltage Circuits

Horizontal sync pulses from thesync inverter stage on the VA verti-cal panel continue to the pulse form-er and horizontal AFC circuit on theDA horizontal panel. With bothsync and flyback pulses present, thepulse former stage develops a prop-erly timed gating pulse, which is ap-plied to the TA color video panel.The horizontal AGC circuit com-pares the horizontal sync with theflyback pulse and stabilizes the hori-zontal oscillator.

The horizontal pre -driver, driverand output stages couple the energy

to the horizontal output transform-er. The high voltage is rectified by asolid-state rectifier, then applied tothe picture tube anode and divideddown to provide the focus voltage.

Energy from the horizontal sweepyoke winding is transferred to theGA pincushion panel and correctsthe vertical pincushion errors. Thehorizontal regulator amplifier anddriver receive a driving voltagefrom the vertical convergence trans-former to correct side pincushion er-rors by controlling the regulated dcto the horizontal output stage. Awinding on the horizontal outputtransformer supplies the necessaryvoltages to the HA convergencepanel.

Next month we will review Moto-rola's new simplified remote controlsystem, which includes only twopush buttons on the remote controltransmitter. Most of the remote re-ceiver is placed on a single plug-inpanel.

AUDIO...continued from page 45

nected hookup. The length of micro-phone cables should also be careful-ly estimated during the survey pe-riod.

Finally, the type of speakers need-ed, their power and the approximatelocation of each should be deter-mined. Likewise, with the approxi-mate location of the amplifier andmicrophone or microphones.

On large, new -construction instal-lations, many audio service dealerswork closely with building contrac-tors and the customer-farming outthe survey work to audio consul-tants. Cable -pulling work goes toelectrical contractors. The servicedealer, in these cases, confines hisjob primarily to furnishing theequipment, putting it together, in-stalling and connecting it, checkingit out and providing future mainte-nance.

this willERATTA

The Phase Corp. Audio Sweep Gener-ator described on page 34 of ourNovember 1971 issue has an output of0 to 6v p -p rather than merely 0.6vp -p as indicated in the description ofthis instrument.

--- - -- --- ----- ..___

important points in selecting ampli-fiers, speakers and microphones.

Make plans now to attend the first jointservice convention. Jung Hotel, New Or -

leans, La., August 9-13, 1972.

NOW...BOTH

ONEKINDS

ISOLATION

PERMA-POWEROF

NEW

COLOR

BRIT

BRITENERTV PICTURE

AND

SOLVESPROBLEMS..0HAS BOTH...

BOOST!4

This efficient new When needed later,Britener corrects for "c .M/1. 11001, sliding the boost switchcathode -to -filament r 1

raises electron emission,shorts causing loss of restores full contrast andblack and white video --" sharpness to fadingdrive . . . isolates the picture.short, restores the blackand white informationnecessary for color pic-ture quality.

,+01".0

11110thr Or Al, -1:4. 14.......... c.5 -

Model C-503for round tubes

eRma OMR Model C-513for rectangular tubesPERMA POWER DIVISION OF

CHAMBERLAIN MANUFACTURING COR,ORATION Dealer Net 57.75

5740 North Tripp A,enue, Chicago, Illinois 60646 (312) 539-7171

... for more details circle 124 on Reader Service Card

JANUARY 1972, ELECTRONIC TECHNICIAN/DEALER 67

TESTEQUIPMENT

atDiscountPrices

43E1N0017==t

Equipment by OtherManufacturers also Available

Catalog & Priceson Request

FORDHAM Radio Supply Co., Inc.265 E. 149 Street, Bronx. N.Y.10451

-"y\taws,Tel: (212) 585-0330 RCA

DISTRIBUTORS OF ELECTRONIC SUPPLIES

... for more details circle 112 on Reader Service Card

Technicians, Earn Your Associate

DEGREEmostly by correspondence

Accredited by the Am, It Comm of NA...A I loco,Study Council ( i I Bill Ainiroseil Flee r.11.110g

Wale Dept. TGrantham School of Engineering

1505 N Western. Hollywood. (rolif. 90027.. for more details circle 114 on Reader Service Card

FREE CATALOG ----HARD-TO-FIND PRECISION TOOLSLists more than 1700 items-pliers,tweezers, wire strippers, vacuum systems, .1.

relay tools, optical equipment, tool kits cs

and cases. Also includes four pages ofuseful "Tool Tips" to aid in tool selection. Ilk

-10 ,TIEISTISIErst T CD (D1-113 octet .ax_t_.1-o-v- a4117 N. 10th Street, hoenix, Arizona SSOIS

. . for more details circle 116 on Reader Service Card

HIRE THEM FIRST

MT

T.

rat MM. MOIMMION NUMPOIME

THE TRAINING AND EMPLOYMENTOF OUR NATIONS WOUNDED

ti.w n* 51 ASSOCIATION. WC. 14740 GOO lb.1o4 N.Y. 100211 21243216N

,_:.:ter.:` *1=110TIE WOUNDID MAIL NEVER OE IFORGOWEIC

READERS

SERVICEINDEX

ADVERTISER'S INDEX

101 Amperex Electronic Corp. .22

102 B & K Division, Dynascan Corp.2nd Cover

103 Book Club-Schematics 53

104 Book Club-Tab Books 34-37

105 Centralab Distributor Products 65

106 Dictaphone .58

107 EICO Electronic Instruments Co.,Inc. 58-59

108 Electronic Chemical Corp. 66

109 Electronic Devices, Inc. 63

110 Enterprise Development Corporation 66

111 Finney Company, The 38

112 Fordham Radio Supply Co., Inc. .68

113 Ford Marketing Corp. 27

114 Grantham School of Engineering 68

GTE Sylvania, Electronic Components4th Cover, 29

115 Heath, Company, The 28

116 Jensen Tools & Alloys 68

117 Leader Instruments Corp. 3rd Cover

118 LPS Research Laboratories, Inc. 59

119 Mallory Distributor Products Co. 20

120 Nat'l. Alliance Television &Electronic Service Assns. 31

122 Nortronics, Inc. .33

124 Perma-Power Company 67

125 Precision Tuner Service126 RCA Parts & Accessories 25

127 RMS Electronics, Inc. 62

131 Telematic Div., UXL Corp. 64

128 Ullman Devices Corp. 33

129 Weltron Co., Inc. .60

130 Xcelite, Inc. 30

NEW PRODUCTS

700 Security Alarm 32

701 Antenna 32

702 Soldering Iron 32

703 Tube Tester 60

704 Magnetic Nutdrivers 60

705 Circuit Line Extender 60

706 Plugs and Cables 60

707 Phono Connectors 60

708 Replacement Picture Tube 62

709 Midget Ratchet Kit 62

710 Oscilloscope 62

711 Precision Tweezers 62

712 Radio Transceiver 64

713 Amplifier 64

714 Turntable 64

715 Wireless Radio Mike 65

716 Recorder 65

717 Tape Control System .65

718 Two -Way Antenna System 65

TEST INSTRUMENT

900 California Instruments' DigitalMultimeter/ Counter 52

BOOK REVIEWS

INSURANCE CHECKLIST FORSMALL BUSINESS, Small MarketersAid No. 148, Small Business Admini-stration, Office of Management Assist-ance, Washington, D.C. 20416 byMark R. Greene, 16 pages, free.

Proper insurance for protectingyour business is a must. However, ac-cording to this book you may find thatyou have more insurance than youwould be able to collect, or you mayhave unknowingly violated certainconditions of your insurance policy,making it worthless. These and manyother important factors that youshould consider are included in thiseasy -to -read checklist. Essential busi-ness insurance coverages discussed in-clude fire insurance, liability insur-ance, automobile insurance, andworkmen's compensation insurance.

This book is a must for all inde-pendent businessmen, and the resultsof your checklist should be discussedwith your insurance agent.

RESULTS OF THE 1970 MICRO-WAVE OVEN SURVEY prepared bythe U.S. Department of Health, Edu-cation and Welfare, Public HealthService, Food and Drug Administra-tion and published by the Superin-tendent of Documents. U.S. Govern -',tent Printing Office, Washington,D.C. 20402 Stock No. 1715-0023, 160pages. paperbound $1.25.

Microwave ovens represent a newconsumer electronic product that re-quires servicing, and we have receivedreader comments concerning the greatfuture business potential for market-ing and servicing these products, plusa concern for technician and custom-er safety. The analysis of this reportindicates that their radiation leakageis a function of oven design, usermaintenance and frequency of service.The most frequently observed causeof excess radiation leakage is interlockmaladjustment. Proper maintenanceon the part of the user and improvedservicing, including microwave emis-sion measurement, will continue toplay an important role in controllingmicrowave oven leakage. There is aneed for continued surveillance ofmicrowave ovens.

The hook includes a report on howthe survey was planned and the pro-cedures carried out. It includes a gen-eral analysis of the results and thengoes into detail, specifying the resultsfor the many models of the variousbrands of microwave ovens now onthe U.S. market. A summary of ac-complishments is also included.

68 I ELECTRONIC TECHNICIAN/DEALER, JANUARY 1972

LEADERHAS THE ONLY LAB GRADE 3" TRIGGERED SCOPE WITH

MODEL LBO -301$334.50

10 MVp-p SENSITIVITY

3" PORTABILITY

VERTICAL & HORIZONTAL CALIBRATIONThe Model LBO -301 has the compact size, theprofessional grade sensitivity and the ease of useto make it one of your greatest buys! Let theseplus features speak for themselves:

DC to 7MHz bandwidth.

5x magnification (max. 0.2(Ls/div.)

70 nanosecond rise time.

0.5Vp-p; sq. wave calib. voltage.

Vectorscope and Z-axis modulation.

Easy to use horizontal panel design.

In all, the LBO -301 is big enough to solve yourcolor TV service problems and small enough touse anywhere! Prove it to yourself. See your dis-tributor. And make it a point to ask for Leaderperformance -rated accessories.

Seeing is believing.

Send for catalog.

INSTRUMENTS CORP.

37 27 Twenty -Seventh Street,Long Island City, N.Y. 11101 (212) 729.7410

i.% grthir, t fm., ithou( non, r. . for more details circle 117 on Reader Service Card

You can make more money sellingthe Sylvania color bright 85XR.

And Olive Oyl will look just as beautiful.Beauty is in the eye of the beholder.And the beauty of the color bright

85XR that its picture is in the sameleague as t1e more expensive "black sur-round" and "black matrix" color tubes.

Our bright phosphors make the colorbright 85XR real competition for any pic-ture tube on the market.

And our simplified manufacturing

Simulated. king Feature. S.ndicate C.; 1471 %%mid Rights Reser.e.l.

process lets us sell it to you at a lowerprice than any "black surround" tube.

The picture will look beautiful to yourcustomer.

The profit will look beautiful in ycurcash register.

If that isn't beauty. what is?

CM SYLVANIA