PHOTO PACT* Folder ZENITH CHASSIS19M20, U, Z, 19M21, U, UZ, Z

VOLUMECONTROLON-OFFSWITCH

ZENITH MODEL

CHANNELSELECTOR

SWITCH

M1800RTRADE NAME Zenith

i

MODELS

M1800E, M1800R, R1800EZ, R1800RZ, R1812EZ, R1812RZM1800EU, M1800RU, R1800EUZ, R1800RUZ, R1812EUZ,R1812RUZ.M1800EZ, M1800RZM2228R, M2229E, M2229R, M2230E, M2230R, M2230RZ2,Ma249E, M2249R, M2250E, M2250R, M2252E, M2252R,R2229EZ, R2229RZ, R2230EZ, R2230RZ, R2249EZ,R2249RZ, R2250EZ, R2250RZ, R2257EZ, R2257RZ,R2258EZ, R2258RZ .M2228RU, M2229EU, M2229RU, M2230EU, M2230RU,M2249EU, M2249RU, M2250EU, M2250RU, M2252EU,M2252RU, R2229EUZ, R2229RUZ, R2230EUZ, R2230RUZ,R2249EUZ, R2249RUZ, R2250EUZ, R2250RUZ, R2257EUZ,R2257RUZ, R2258EUZ, R2258RUZM228RZ, M2229EZ, M2229RZV M2230EZ, M2230RZ,M2249EZ, M2249RZ, M2250EZ, M2250RZ, M2252EZ,M2252RZ ,M2250RUZ

CHASSIS

19M20

19M2OU19M20Z

19M21

19M21U

19M21Z19M21UZ

MANUFACTURER Zenith Radio Corp. , 6001 Dickens Ave. , Chicago 39, IllinoisTYPE SET TelevisionTUBES Nineteen

Receiver

POWER SUPPLY 110-120 Volts AC-60 Cycle RATING 1. 6 Amp. (a> 117 Volts ACTUNING RANGE Channels 2

Drive Cord Stringing

thru 13 VHP, 14 thru 83 UHF, Video IF 45. 75 MC, Sound IF 41. 25 MC

INDEX6, 7 Photographs (Cont)

(Intercarrier)

, . . , 23 Trans. , Inductor Si Alignment Identification

Horizontal Sweep Circuit Adjustments 11 Servicing in the FieldParts List and Descriptions ....Photographs

Cabinet-Rear View

Chassis-Top ViewRF TunerResistor Identification

15 thru 18 Schematic (Alternate Tuner)Schematic (TV)

11 Trouble Shooting Aids4 , 9 Tube Failure Check Chart ........

3 Tube Placement Chart (Bottom View)10, 21 Tube Placement Chart (Top View) ...14, 19

12,

208

22132

215R5

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HOWARD W. SAMS & CO., INC. • Indianapolis 5, Indiana

"The listing of any available replacement part herein does not constitute in anycase a recommendation, warranty or guaranty by Howard W. Sams & Co., Inc.,as to the quality and suitability of such replacement part. The numbers of theseparts have been compiled from information furnished to Howard W. Sams & Co.,Inc., by the manufacturers of the particular type of replacement part listed.""Reproduction or use, without express permission, of editorial or pictorial con-

tent, in any manner, is prohibited. No patent liability is assumed with respect tothe use of the information contained herein. Copyright 1954 by Howard W.Sams & Co., Inc., Indianapolis 5, Indiana, U. S. of America. Copyright under In-ternational Copyright Union. All rights reserved under Inter-American CopyrightUnion (1910) by Howard W. Sams & Co., Inc." Printed in U. S. of America

DATE 12-54 SET 259 EOLDER 16

THE COOPERATION OF THE MANUFACTURER OF THIS

RECEIVER MAKES IT POSSIBLE TO BRING YOU THIS SERVICE

» MEASUBED FROM PIN 1

A PHOTOFACT STANDARD NOTATION SCHEMATIC

©Howard W. Sami & Co., Inc. 1954

PAGE 2

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SET 259 FOLDER 16PAGE 3

CHASSIS BOTTOM VIEW-CA

PAGE 4

JJ28) (C32J (C27

W-CAPACITOR IDENTIFICATION

PAGE 9

TUBE PLACEMENT CHART

1ST VIDEO IFTOP VIEW

INDICATES BLANK PIN OR LOCATING KEY ON TUBE SOCKET

SYNC

TUBE FAILURE CHECK CHART

The following; chart lists tubes whose fa i lures are most likely to produce the indicated symptoms.Refer to tube placement chart for location and type of tube.

POWER SUPPLY FAILURENo raster, no sound - V18

LOSS OF PICTURE OR SOUNDNo pic, no sound, has raster - V2, V3, V4, V5, V6No pic, no sound, has snow - VI, V2, V3No pic, has sound, has raster - V6, V7, V19Has pic, no sound - V8, V9, V10Overloaded picture -V7

SYNC FAILURENo vert, sync - VJ, VllNohoriz. sync -Vll, V13, V14No vert, or horiz. sync - Vll

SWEEP FAILURENo raster, has sound - V14, V15, V16, VI7, V19, Fuse (Ml)No vertical deflection - V7, V12Poor vert, linearity or foldover - V7, VT2Poor horiz. linearity or foldover - V14, V15, VI6Narrow picture - V14, V16, V17, V18Vert, off freq. - V7, VllHoriz. off freq. -Vll, V13, VM

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SET 259 FOLDER 16PAGE 5

ALIGNMENT INSTRUCTIONS

1.

2.

3.

4.

The high voltage lead should be securely taped and kept away from the chassis. Do not remove the horizontal oscillator tube (V14) to disable thehigh voltage .

VIDEO IF ALIGNMENT

Connect the negative lead of a 2 volt bias supply to the ungrounded side of C31.Connect the positive side to chassis.Connect the synchronized sweep voltage from the sweep generator to the horizontal input of the oscilloscope for horizontal deflection.

DUMMYANTENNA

470MMF

SWEEPGENERATOR

COUPLING

High side to pin 1 (grid)of 6CB6 (V5). Low sideto chassis.

High side to point .Low side to chassis .

SWEEPGENERATORFREQUENCY

43MC(10MC Swp)

MARKERGENERATORFREQUENCY

39.75MC45.75MC

39.75MC41.25MC47.25MC

42.75MC«.OMC45.75MC

CHANNEL

Any noninterfer-ingchannel

CONNECTSCOPE

Vert. Amp. thru10KSJ to point .Low side to chassis

ADJUST

A1.A2

A3.A4,A5

A6, A7,A8,A9

REMARKS

Attenuate generator output for 3 voltspeak to peak on scope. Adjust for responsecurve of maximum amplitude and sym-metry similar to Fig. 1.

Remove bias battery. Use maximumscope gain to amplify trap region ofresponse curve as in Fig. 2. Adjust forMINIMUM marker amplitude. Reconnectbias supply.

Attenuate sweep generator output tomaintain not more than 3 volts peak topeak on scope. Alternately adjust A6 thruA9 to obtain response similar to Fig. 3.A6 affects the high side and A7 affectsthe low side of the response curve.

OSCILLATOR ALIGNMENT

The master oscillator adjustment, A10, is to be made only if the individual channel oscillator adjustment fails to bring the channel within therange of the fine tuning control. If channels 2 thru 6 fall within the range of the fine tuning controlbut the higher channels do not , slight adjustment of A10 may be necessary to bring in the higher channels ,Connect the negative lead of the bias supply to the ungrounded side of C31. Connect the positive lead to chassis. Adjust for -1 volt at C31.Turn up the scope gain so that the sound trap notch in the response curve becomes visible,.Connect the synchronized sweep voltage from the sweep generator to the horizontal input of the oscilloscope for horizontal deflection.The sweep generator output lead should be terminated with its characteristic impedance, usually 50 ohms.Set the fine tuning control to the mid-position of its range.

DUMMYANTENNA

Two 120S2CarbonResistors

SWEEPGENERATORCOUPLING

Across antenna ter-minals with 120S2 ineach lead.

SWEEPGENERATORFREQUENCY

57MC(10MC Swp63 MC(10MC Swp69MC(10MC Swp79MC(10MC Swp85MC(10MC Swp177MC(10MC Swp183MC(10MC Swp189MC(10MC Swp195MC(10MC Swp201MC(10MC Swp207MC(10MC Swg213MC(10MC Swp

MARKERGENERATORFREQUENCY

59.75MC

65.75MC

71.75MC

81.75MC

87.75MC

179.75MC

185. 7 SMC

191.75MC

197.75MC

203.75MC

209.75MC

215.75MC

CHANNEL

2

3

4

5

6

7

8

9

10

11

12

13

CONNECTSCOPE

Vert. Amp. thrulOK.fl to point .Low side to chassis

ADJUST

All

A12

A13

A14

A15

A16

A17

A18

A19

A20

A21

A22

REMARKS

Adjust to place sound marker in trapnotch as in Fig. 4.

FIG. FIG.2 FIG.3 FIG.4

PAGE 6

ALIGNMENT INSTRUCTIONS (cont)HF AND MIXER ALIGNMENT

Remove the bias supply from C31 and connect a jumper from the tuner AGC lead (yellow) to chassis.Connect the synchronized sweep voltage from the sweep generator to the horizontal input of the oscilloscope for horizontal deflection.The sweep generator output lead should be terminated with its characteristic impedance, usually 50 ohms.

DUMMYANTENNA

Two 120S2CarbonResistors

SWEEPGENERATOR

COUPLING

Across antenna ter-minals with 120S2 ineach lead.

SWEEPGENERATORFREQUENCY

69MC(10MC Swp)

201MC(10MC Swp)

MARKERGENERATORFREQUENCY

67.25MC71.75MC

199.25MC203.75MC

CHANNEL

4

11

CONNECTSCOPE

Vert. Amp. thru10KS3 to point ^> .Low side to chassis.

ADJUST

A23,A24,A25

A26,A27,A28

REMARKS

Adjust for response similar to Fig. 5.

Adjust A26 and A27 for symmetricalresponse similar to Fig. 6. Adjust A28for proper band width. Repeat steps 5and 6 until best overall symmetricalresponse is obtained. Remove jumperfrom tuner AGC terminal to chassis.

SOUND IF ALIGNMENTConnect an attenuator {Zenith part #3-17203 or equivalent) in series with the receiver antenna.Tune in a tone modulated TV signal and adjust the attenuator until the signal falls below the limiting level of the 6BN6 limiter detector, asevidenced by a hiss similar to superregeneration.Adjust the sound take-off transformer (A29, A30) the sound IF transformer (A31) and the quadrature coil (A32) for maximum sound of bestquality.Adjust the buzz control (R9) for minimum intercarrier buzz.II the intercarrier buzz cannot be eliminated with the buzz control check the setting of the AGC delay control adjustment.II during the sound IF alignment the signal rises above the limiting level (hiss disappears) increase the attenuation until the hiss returns.

UHF TUNER ALIGNMENT

7.

8.

9.

Alignment of the UHF tuner should not be attempted unless proper test equipment is available.Switch the receiver to the UHF position .Connect the negative lead of a 2 volt bias supply to the ungrounded side of C31. Connect the positive lead to chassis.Adjust the sweep generator output to provide 3 volts peak to peak on scope,Connect the synchronized sweep voltage from the sweep generator to the horizontal input of the oscilloscope for horizontal deflection.The sweep generator output lead should be terminated with its characteristic impedance, usually 50 ohms.

DUMMYANTENNA

Fig. 8

SWEEPGENERATOR

COUPLINGAcross UHF antennaterminals thrumatching network (Fig.8).

SWEEPGENERATORFREQUENCY

713MC(10MC Swp)

473MC

887MC(10MC Swp)

MARKERGENERATORFREQUENCY

711.25MC

471.25MC

885.25MC

CHANNEL

54

14

83

CONNECTSCOPE

Vert. Amp. thruIOKSI to point .Low side to chassis.

ADJUST

A33.A34,A3 5

A36, A37A38

REMARKS

Tuner rocket arm should be in the horizontalposition. If necessary, loosen set screw andadjust tuner shaft so that rocker arm ishorizontal when the channel indicator is setto channel 54. Do not adjust A33 unlessoscillator calibration is off more thanthree channels. If necessary, adjust A33 toplace video market at 50% on responsecurve as in Fig. 7, The image (weaker re-sponse) will appear also. The response to-ward the counter clockwise position of A33is the correct response. Adjust A34 andA35 for maximum amplitude and symmetryof response similar to Fig* 7.

Check for response similar to Fig. 7. Ifoscillator is off more than 3 channelsadjust the oscillator travel (osc., mixer andant, travel adjustments are the three roundthumb screws on top of tuner) adjustment toscale. Care must be used in making thisadjustment so as not to move the rockerarm out of its bearing. Set the mixer andantenna travel adjustments for maximumresponse on scope.

Adjust A36 to place video marker at 50% asin Fig. 7. Adjust A37 and A38 for maximumamplitude and symmetry of response similarto Fig. 7.

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FIG.5 F IG .6 FIG. 7

\ON CONTINUOUS TUNER

FIG. 8

PAGE 7

RESISTANCE MEASUREMENTS

Item

V 1

V 2

V 3

V 4

V 5

V 6

V 7

V 8

V 9

V 10

V 1 1

V 12

V 13

V 1 4

V 15

V 16

V 17

V 1 8

V 1 9

Tube

6BK7A

6U8

6CB6

6CB6

6CB6

12BY7

12 AX 7

6AU6

6BN6

6AQ5

6CS6

6AH4GT

6AQ7GT

6SN7GTA

6BQ6GT

6AX4GT

1B3GT

5U4G

17LP4

Pin 1

t750B

tlO. 3KS2

1. IMeg

80KSJ

270n

15n

• 5 Meg

100KB

350!!

350KB

19KB

1. 8Meg

2Meg

47KB

t!2KB

INF

PINS

INF

OB

Pin 2

60KB

68KS!

500B

80KB

420n

3Kn

270KB

on

. 3n

680n

on.in

IMeg

• 215KS2

.in

INF

1 - 8

30KB

lOOKn

Pin 3

INF

ylOOKB

.in

.1S2

.in

isn

40Kn

.in

.m

on

an1. SMeg

on

on6. 8KB

700KS!

HAVE

teenPIN 6• 250KB

Pin 4

.in

.in

on

on

OB

on

on

on

on

.IB

OB

INF

3Meg

32KB

T12KB

INF

INFINITE

16B

PIN 10•32Kfi

Pin 5

on

on

1470B

tSOOB

t8. 2KB

on

on

f32Kn

t22KB

1.4KB

TlOOKB

t460n

t47Kn

teen470KB

t7on

RESISTJ

INFPINUtSOOKSJ

Pin 6

INF

I300B

i470n

t50on

t8. 2KB

.IB

1 800KB

T32Kn

4. 6B

tsoon

i. 8KnINF

470n

10KB

470KB

• 4. 2n

\NCE

isnPIN 12.in

Pin 7

3. 3Meg

on

on

aoKn

on

tsKn

3. 9Kn

on

• 680KB

350KB

jLlOMeg

OB

.IB

onOB

.in

INF

Pin 8

47B

2.2KH

t22Kn

7. 5Kn

i. 8Kn

on

.IB

on

on

30Kn

Pin 9

on

4.4KB

15B

.IB

TUP UAP• 9. 4B

TDPT^SP"• 414B

t MEASURED FROM PIN 2 OF V18i MEASURED FROM PIN 7 OF V4• MEASURED FROM PIN 3 OF V16

1ST VIDEO IF

2ND VIDEO IF

BOTTOM VIEW

VIDEO OUTPUT

LV RECT

HORIZ 8 VERT -SWEEP PROTECTION

HORIZ DISCH

TUBE PLACEMENT CHART

PAGE 8

VHP TUNER-RIGHT SIDE

VHP TUNER-LEFT SIDE

PAGE1O

WIDTHADJ.

HORIZ.DRIVE

CABINET-REAR VIEW

HORIZONTAL SWEEP CIRCUIT ADJUSTMENTS

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Turn the set on and tune In a TV station, preferably a test pattern.

Set the horizontal hold control adjustment until the picture synchronizes horizontally.

Adjust the horizontal Drive trimmer (Bl) counter clockwise for maximum width.

Adjust the width for a picture slightly wider than necessary to fill the picture mask horizontally by sliding and turning

the brass sleeve on the neck of the picture tube.

AGC DELAY CONTROL ADJUSTMENT

Connect the vertical amplifier of an oscilloscope through a 10KSJ resistor to point

TROUBLE SHOOTING AIDS

SWEEP

HORIZONTAL

LOSS OF SWEEP

Follow procedure outlined under "Loss of High Voltage".

INSUFFICIENT SWEEP

Check by substitution V15 and V16. Check adjustment Bl. Check T2, T4A,R94, C77, C76 and other associated components.

DRIVE LINES

Check by substitution V14, V15 and V16. Check T2, T4A.R90, R94, C77and C79. Check adjustment Bl and other associated components.

COMPRESSED LEFT SIDE

Check by substitution V15 and V16. Check horizontal output and damperstages for component failure or change of value.

Follow procedure outlined under "Drive Lines".

PIE CRUST EFFECT

Check by substitution V13, V14, V15 and V16. Check C70 for open. CheckL30 and other associated components.

XMAS TREE EFFECT

Check by substitution V13, V14, V15, and V16. Check L30, C74, C75, C76C77, R86, R90, R88 and R87. Check T2 and T4A for Internal arcing.

VERTICAL

LOSS OF SWEEP

Check by substitution V7 and V12. Check R3, R72,H6, H77, C57, C54,C2D, T3, T4B and other associated components.

INSUFFICIENT SWEEP

Check by substitution V7 and V12. Check height and vertical linearitycontrols for proper operation. Check T3 and T4B.

COMPRESSED AT BOTTOM

Check by substitution V7 and V12. Check R3, H75, C57 and other assoc-iated components.

COMPRESSED AT TOP

Check by substitution V7 and V12. Check R6, R77, C2D and other associatedcomponents.

Check by substitution V7 and V12. Check R72, C54, T3, T4B and otherassociated components.

SYNC

LOSS OF VERTICAL AND HORIZONTAL SYNC

Substitute VU. Check C51, C52, RIO, R68, R66 and other associatedcomponents. 't

LOSS OF VERTICAL SYNC-HORIZONTAL SYNC SATISFACTORY

Substitute V7. Check vertical integator network, check R5, R99, C55 andother associated components.

LOSS OF HORIZONTAL SYNC-VERTICAL SYNC SATISFACTORY

Substitute V13. Check horizontal AFC network. Check'RSO, C65, C70 andother associated components.

HORIZONTAL BENDING

Check by substitution V7, Vll and V13. Check components associated withV13.

VIDEO

LOSS OF VIDEO

Substitute V6. Check R43, L27, R8, R49, C43 and other associatedcomponents.

SOUND BARS (4. 5 MC BEAT)

Adjust tuner fine tuning for best sound and picture. Check adjustmentA30. Check video IF alignment.

POOR CONTRAST

Substitute V6. Check contrast control, picture tube, C43, L27 and C41.Check video detector crystal network.

NEGATIVE PICTURE

Substitute V6. Check video detector crystal network, picture tube, C43,C2C and R49. Check video IF alignment

Substitute V6. Check video detector crystal network. Check C43, C41,L27, R49 and other associated component.

WIDE BLACK BAR ACROSS PICTURE

Check by substitution VI, V3, V4, V5 and V6 for heater to cathode leakage.

AUDIO

WEAK OR NO SOUND

Check by substitution V8, V9 and V10. Check stages V9 and V10 using audiosignal genator. Apply audio signal across Rl.

If Satisfactory

Check audio IF and audio detectorstages for component failure orchange of value.

If Unsatisfactory

Check C49, C50, C1C, H65, R60,R63, speaker, T5 and other assoc-iated components.

Adjust tuner fine tuning for best sound and picture. Check adjustments R9and A32 for minimum buzz. If still unsatisfactory, check audio IF alignment

DISTORTED

Follow procedure outlined under "Weak or No Sound".

POWER

DEAD SET

If filaments fall to light, check AC interlock assembly. Check switch onvolume control and Tl. If filaments light, substitute V18. Check B+filterand decoupling network.

SMALL AND/OR DIM PICTURE

Substitute V18. Check B+ filter and decoupling network.

PAGE 12

PHOTOFACT STANDARD NOTATION SCHEMATIC

©Howard W. Somi S, Co., Inc. 195J

'HP -UHF TUNER WRT NO. S2IOOI USED ON SOME MODELS

ALTERNATE TUNER SCHEMATIC

z 'zn 'n 'L zw6 L 'z 'n yH1IN3Z

L SISSVHD

f •

(R6

CHASSIS BOTTOM VIEW-RI

PAGE 14

f-RESISTOR IDENTIFICATION

PAGE 19

PARTS LIST AND DESCRIPTIONSTUBES (SYLVANIA, GENERAL ELECTRIC, WESTINGHOUSE)

ITEMNo.

VIV2V3V4V5V6V7

V8V9V10VllV12

VI3V14

V15V16V17V18

USE

RF AmplifierMixer - Osc.1st. Video IF Amp.2nd. Video IF Amp.3rd. Video IF Amp.Video OutputAGC Keying-Vert. Mult.Sound IF Amp.Audio DetectorAudio OutputSync SeparatorVert. Mult. -Vert. OutputHoriz. AFCHoriz. Oscillator-Horiz. DischargeHoriz. OutputDamperHV RectifierLV Rectifier

REPLACEMENT DATA

ZENITHPART No.

6BK7A6U86CB66CB66CB612BY7

12AX76AU66BN66AQ56CS6

6AH4GT6AQ7GT

6SN7GTA6BQ6GT6AX4GT1B3GT5U4G

STANDARDREPLACEMENT

6BK7A6U86CB66CB66CB612BY7

12AX76AU66BN66AQ56CS6

6AH4GT6AQ7GT

6SN7GTA6BQ6GT6AX4GT1B3GT5U4G

RETMABASETYPE

9AJ9AE7CM7CM7CM9BF

9A7BK7DF7BZ7CH

8EL8CK

8BD6AM4CG3C5T

NOTES

CATHODE-RAY TUBEITEMNo.

VI 9

REPLACEMENT DATA

ZENITHPART No.

17LP4 /17VP421YP421YP4A (p

CBS-HYTRONPART No.

17LP4

21YP421YP4A (D

GENERAL ELECTRICPART No.

17LP4 /17VP421YP421YP4A CD

SYLVANIAPART No.

17LP4 /17VP421YP421YP4A O21AFP4C2

WESTINGHOUSEPART No.

17LP4

12YP421YP4A (J

RETMABASETYPE

12L

12L12L12M

NOTES

S> Aluminlzed® Circuit change

necessary

CAPACITORSCapacity values given in the rating column are in mfd. for Electrolyticand Paper Capacitors, and in mmfd. for Mica and Ceramic Capacitors.

ITEMNo.

CIABC

C2ABCD

C3C4C5C6C7C8C9CIOCllC12CISC14CISC16C17CISC19C20C21C22C23C24C25C26C27C28C29C30C31C32C33C34CSSC36C37C38C39C40C41C42C43C44C45C46A

BC47C48C49C50C51C52CSSC54C55C56

RATINGCAP.

• 40.80430.40• 10A 10100404040402.5-64008004002.2400400400.85-2.:.6-380010019240024.5105.54004702496.13301000.01510004701000470470100047.022.13.3501000100010.0110000.0068.003327.0022.022.33.0022

VOLT

400 1400 \0 1

450 1450 I400 (50 J

400

200

200200

200

1000600

600600200600

REPLACEMENT DATAZENITHPART No.

22-2437

22-2483

22-251922-251922-251922-251922-222122-240122-233122-240122-246822-240122-240122-240122-245322-250422-233122-240722-240622-253622-255722-253622-250022-241122-244922-255722-2217

22-177722-230922-7

22-722-230222-722-252422-221722-211222-246722-178122-177722-234322-246022-2553

22-237822-322-322-249522-178522-239622-184522-212922-215922-2161

AEROVOXPART No.

AFH3-46

AFH4-83

BPD-0008

SI2 . 2NPO

BPD-0008SHOO

SI2 . 2NPO

SI10NPO

SI470

P288-1

BPD-001P288-1BPD-001SI470BPD-0011469-0005SI470

P288-1

BPD-2X001

P28~ Vt

C -J- w>CN

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SET 259 FOLDER 16PAGE 15

CAPACITORS (cont)PARTS LIST AND DBS

RESISTO

ITEMNo.

C57C58C59C60C61C62C63A

BC64C65C66C67C68C69C70C71C72C73C74C75C76C77C78C79C80C81C82C83C84C85

RATCAP.

.110001000.022.033.011000100010000100120.0010047.15.001.1680.001510001000680220.047.15724.57470.15.01

NGVOLT

600500500200200400

500200400200200200

500400500

500

4004002000

200200

REPLACEMENT DATAZENITHPART No.

22-184122-254522-254522-178122-184022-184622-2545

22-322-922-250522-183922-184222-216622-183922-177722-234022-178522-216322-211222-238722-245822-177522-2341

22-252222-2375

22-3

AEROVOXPART No.

P688-11464-0011464-001

P4 88-01BPD-2X001

BPD-01BPD-00011469-0001P688-001

P688-001P288-11469-0007P488-00151468-001

P488-047

SI470P288-15P288-01

CENTRALABPART No.

DF-104

D6-103DD2-102

DD-103DD-101

D6-102

D6-102DF-104

D6-152

DF-503

D6-471

D6-103

CORNELL-D U B I L I E R

PART No.CUB6P11R5D11R5D1

CUB4S1DK069

K082G04222B5T12CUB6D1

CUB GDIPJ2P1LR5T68CUB4D151H5D1

CUB4S47

PJ2P15PJ2S1

ERIEPART No.

GP2-333-103812-001

811-01801-0001

GP2-333-102

GP2-333-102

GP2-333-152

GP1K-471

MALLORYPART No.

PT601MCE-255MCE-255

PT411DCD-521

DC-511UC-531MCE235PT621

PT621PT401

PT4215MCE255

PT4147

UC-5347PT4015PT411

SPRAGUEPART No.

6TM-P1MS-21MS-21

4TM-S15HK-2D1

5HK-S15GA-T1MS-316TM-O1

6TM-D12TM-P1

MS-374TM-D15MS-21

4TM-S47

5GA-Q472TM-P152TM-S1

NOTES

Nole 6

CONTROLS

ITEMNo.

RIABC

R2AB

R3A

BR4A

BR5A

BR6A

BR7A

BR8R9R10A

B

RATING

RESIST-ANCE

IMegShaftSwitch7. SMegShaftlOMeg

with IMegstopShaft200KOShaft75KOShaft25000Shaft15KOShaft5000060004.5MegShaft

WATTS

1

1

i

J

1

i

41z

REPLACEMENT DATA

ZENITHPART No.

63-3199Not Req.Not Req.63-2919Not Req.63-2946

Not Req.63-2837Not Req.63-2896Not Req.63-2971Not Req.63-2976Not Req.63-320163-316763-3208Not Req.

IRCPART No.

Q13-137Not Req.76-1Qll-142RQQll-143

RQQll-129Not Req.Qll-125NotHeq .Qll-112RQQll-119RQ

Qll-141Not Req.

CLAROSTATPART No.

A47-lMeg-ZKSS-3SWE-12

A47-7. 5Meg-SFKS-1/4

A47-10Meg-S

FKS-1/4A47-200K-SKSS-3A47-75K-SKSS-3A47-3000-SFKS-1/4A47-15K-SFKS-1/4

39-600A47-5Meg-SFKS-1/4

C E N T R A L A BPART No.

AB-70AK-4KB-1AB-98AK-1AB-98

AK-1AB-46AK-4AB-35AK-1AB-7AK-1AB-20AK-1SUP-999

AB-87AK-1

MALLORYPART No.

U-53Not Req.U-26U-82Not Req.U-826

Not Req.U-430Not Req.U-41Not Req.SU-8Not Req.SU-29Not Req.M5MPK

SU-67Not Req.

INSTALLATION NOTES

VolumeAttach to RIAAttach to RIAFocusAttach to R2AHeight - Note

Attach to R3ABrightnessAttach to R4AVert. HoldAttach to R5AVert. LinearityAttach to R6AAGCAttach to R7AContrast -wire woundBuzz - wire woundFringe lockAttach to R10A

Note. Connect a IMeg resistor in series with right hand termiof control and the lead connecting to same terminal or theoriginal control (control viewed from shaft end terminals dow

RESISTORS

ITEMNo.

RllR12R13R14R15R16R17R18R19R20R21R22R23R24R25R26R27S28R29R30R31R32R33R34R35R36R37R38R39R40R41

RATING

OHMS

47KO470KS!27KO4 7O100KO100KO220047000470068KO100KO82KO220002200!!10KO22KO6805601800470027KO68000120KO15012KO120 KO47002700 5%1500820005KO

WATT

i3

I~2

zL

2

|

k̂I

2

i2Jzii2

2

\

|

5

I

i

§

2s

REPLACEMENT DATAZENITHPART No.

63-185663-189763-184563-172963-186963-186963-175863-181363-177263-186263-186963-186663-179963-179963-317063-172963-173763-173363-175463-177263-184163-182163-187363-170863-182763-187363-177263-176063-175063-110163-1834

IRCPART No.

BTS-47KBTS-470KBTS-27KBTS-47BTS-100KBTS-100KBTS-220BTS-4700BTS-470BTS-68KBTS-100KBTS-82KBTS-2200BTS-2200BTB-10KBTS-22KBTS-68BTS-56BTS-1 80BTS-470BTS-27KBTS-6800BTS-120KBTS-15BTS-12KBTS-120KBTS-470BTS-270BTS-150BTB-8200BTS-15K

NOTES

Note 1

Note 2

ITEMNo.

R42R43R44R45R46R47R48R49R50R51R52R53R54R55R56R57R58R59R60R61R62R63R64R65R66R67R68R69R70R71R72

RATING

OHMS

15022K«IOOKO100KO33KO47KO10 MeK6800220KO39000180K1J220KO220KO680KO2. 2MegIOOKO10KO22KO680O680KQ6. SMeg680022KO470O470KO100KO470KO56KS!220KO47KO22KO

WATT-2f

f

^

REPLACEMENT DATA

ZENITHPART No.

63-170863-94263-186963-186963-184863-185563-196163-229063-188463-181063-231363-188463-188463-190463-192663-187063-182763-214163-177963-190463-194763-229063-184263-177163-189763-186963-189763-185963-188363-185563-1841

IRCPART No.

BTS-15BTB-22KBTS-100KBTS-100KBTS-33KBTS-47KBTS-10 MegBTA-680BTS-220KBTS-3900BTA-180KBTS-220KBTS-220KBTS-680KBTS-2. 2MegBTS-100KBTS-10KBTB-22KBTS-680BTS-680KBTS-6. SMegBTA-680BTS-22KBTS-470BTS-470KBTS-100KBTS-470KBTS-56KBTS-220KBTS-47KBTS-22K

NOTES

Note 3

Note 4

Note 5

ITEMNo.

R73R74H75R76R77R78H79R80RBIR82R83R84R85R86

RATING

OHMS100KBloonI. 8MegIOOKO10000560056001 Meg1 Meg1 Meg27KO1000470047KO

WATT

REPLACEMENT DATA

ZENITHPART No.

63-186963-174463-192263-187063-96563-177563-177563-19U63-191163-191163-184563-174463-177163-1194

IRCPART No.

BTS-100KBTS-100BTS-1. BMegBTS-100KBTA-1000BTS-560BTS-560BTS-1 MegBTS-1 MegBTS-1 MegBTS-27KBTS-100BTS-470BTA-47K

NOTES

Note 1. Some versions may use 22KSNote 2. Some versions may use 10KSNote 3. Some versions may use 15KSNote 4. Not used in all versions.Note 5. Add this resistor for combir

TRANSFORMEF

ITEMNo.

Tl

RATING

PRI

117VAC®1. 6A

SEC. 312.6VCT

PARTS LIST AND DESCRIPTIONS (Continued)RESISTORS (cont)

LLORY(TNo.

1-255-255

1-521

11312351

1II

2153255

147

534701511

SPRAGUEPART No.

6TM-P1MS-21MS-21

4TM-S15HK-2D1

5HK-S15GA-T1MS-316TM-D1

6TM-D12TM-P1

MS-374TM-D15MS-21

4TM-S47

5GA-Q472TM-P152TM-S1

NOTES

Note 6

INSTALLATION NOTES

VolumeAttach to R1AAttach to R1AFocusAttach to R2AHeight - Note

Attach to R3ABrightnessAttach to R4AVert. HoldAttach to R5AVert. LinearityAttach to R6AAGCAttach to R7AContrast -wire woundBuzz - wire woundFringe lockAttach to RIGA

ACEMENT DATA

THNo.

IRCPART No.

BTS-1 5BTB-22KBTS-100KBTS-100KBTS-33KBTS-47KBTS-10 MecBTA-680BTS-220KBTS-3900BTA-180KBTS-220KBTS-220KBTS-680KBT3-2. 2MegBTS-100KBTS-10KBTB-22KBTS-680BTS-680KBTS-6. 8MegBTA-680BTS-22KBTS-470BTS-470KBTS-100KBTS-470KBTS-56KBTS-220KBTS-47KBTS-22K

NOTES

Note 3

Note 4

Note 5

ITEMNo.

R73H74H75R76R77R78R79R80R81RB2R83R84R85R86

RATING

OHMS

IOOKQ100 Si1. 8MeglOOKnlooon560n5600IMegI M e g1 Meg27Knloon470n47Kn

WATT

2

2

2

BI121|

2

2

2

II

J

REPLACEMENT DATA

ZENITHPART No.

63-186963-174463-192263-187063-96563-177563-177563-191163-191163-191163-184563-174463-177163-1194

IRCPART No.

BTS-100KBTS-100BTS-I. 8MegBTS-100KBTA-1000BTS-560BTS-560BTS-1 MegBTS-1 MegBTS-1 MegBTS-27KBTS-100BTS-470BTA-47K

NOTESITEMNo.

R87R88R89R90R91R92R93R94R95R96H97R98R99R100

RATING

OHMS

22KnlOKn47Knisosneeoon9in 5%470KHi2Kn22Kn33KnlOOKn330nIOKH8. 2n

WATT

2

211LJ.

221111

î

REPLACEMENT DATA

ZENITH

PART No.

63-184263-214563-185663-231363-182063-174463-189863-109163-95863-184963-187063-3162

IRCPART No.

BTS-22KBTB-10KBTS-47KBTA-I80KBTS-6800BTS-91BTS-470KBTB-12KBTA-22KBTA-33KBTA-100KBT.A-330BTS-10K

NOTES

Note 4Note 4Note 4

Note 1. Some versions may use 22KS7 resistor in this application.Note 2. Some versions may use IOKS2 resistor in this application.Note 3. Some versions may use 15KS2 resistor in this application.Note 4. Not used in all versions.Note 5. Add this resistor for combination units only.

TRANSFORMER (POWER)

ITEMNo.

Tl

RATING

PRI

117VAC@1.6A

SEC. 3

12.6VCT&J4.4A

SEC. 1

524VCT.250ADC

SEC. 4

SEC. 2

5VAC®3A

SEC. 5

REPLACEMENT DATA

ZENITHPART No.

95-1375

StancorPART No.

MerilPART No.

TriadPART N->

RCATYPE No. PART No. PART No.

26R330)®)®

Q Use only one 5V winding.© Series 6.3V windings for 12.6VCT.(3) Use universal mounting brackets.

TRANSFORMERS (SWEEP CIRCUITS)

ITEMNo.

T2T3

T4AB

USE

Horiz. Output Trans.Vert. Output Trans.

Yoke-Horiz. (13MH)Vert. (42MH)

REPLACEMENT DATA

ZENITHPART No.

S-20993 (B95-1377

95-1378S-19898 ©

PART No.

A-8148

DY-9A ®

MerilPART No.

MDF-72®

TriadPART No.

DA-36 ®A-108X®

Y-17-1®

RCATYPE No.

211D2 ®

HalldorsonPART No.

DF602 ®

PART No.

Y-7 ®

CD Winding and terminal assembly part #S-21078.enterng evice an yoe cover.

Use original yoke cover and positioning device.® See instruction sheet packed with unit for replacement procedure,© Connect as auto transformer.(§) Drill one new mounting hole.

TRANSFORMER (AUDIO OUTPUT)

ITEMNo.

T5

IMPEDANCE

PRI.

9. 4Kn

SEC.

4. 2n

REPLACEMENT DATA

ZENITHPART No.

95-1379

PART No.

A-3879

MeritPART No.

A-2932

TriadPART No.

S-51X

PART No.

Z1117

PART No.

24S60

NOTES

SPEAKER

ITEMNo.

SPl

RATINGS

SIZE

4"5 1/4"10"

FIELD

PMPMPM

V. C IMP.4. 2n4. 2il4.2SJ

REPLACEMENT DATA

ZENITHPART No.

49-75049-751 (D49-752 ®

VIKING

PART No.

4J6525J410J11

QUAMPART No.

4A0752A1IOA3I

NOTES

(D Used in Models M2228RZ,M2229RZ, and M2229EZ

(2) Used in Models M2250RZ, M2250EZ,M2250RU, M2250EU, M2252RZ, and M2252EZ

COILS (RF-IF)

ITEMNo.

LI

L2

L3

L4

L5

L6

L7A

B

C

D

E

F

G

USE

Series PoliceTrapShunt PoliceTrapSeries PoliceTrapSeries PoliceTrapShunt PoliceTrapSeries PoliceTrapAnt, , RFGr d CoilAn . , RFGr d CoilAn . , RFGr d CoilAn . , RFGr d CoilAn . , RFGrid CoilAnt, RFGrid CoilAnt, RFGrid Coil

DC

PRI.

on

on

on

on

on

on

on

on

on

on

on

on

on

RES.

SEC.

ZENITH

PART No.

20-490

20-505

20-490

20-490

20-505

20-490

S-21192

S-21193

S-21194

S-21195

S-2I196

S-19847

S-19848

REPLACEMEN

MEISSNERPART No.

T DATA

MERITPART No.

M I L L E RPART No.

NOTES

Channel 2

Channel 3

Channel 4

Channel 5

Channel 6

Channel 7

Channel 8

ITEMNo.

H

I

J

K

L

L8L9L10L11A

B

C

D

E

F

G

H

I

J

K

L

L12

L13L14

L15L16L17LIBL19L20L21L22L23

L24

L25

L26L27

L28L29

L30LSI

USE

Ant. , RFGrid CoilAnl. , RFGrid CoilAnt. , RFGrid CoilAnt , RFGrid CoilAnt , RFGrid CoilFil. ChokeNnut CollRF CoilRF, MixerGrid, Osc.CollRF, MixerGrid, Osc.CoilRF, MixerGr id, Osc.CoilRF, MixerGrid, Osc.CoilRF, MixerGrid, Osc.CoilRF, MixerGrid, Osc.CoilRF, MixerGrid, Osc.CoilHF, MixerGrid, Osc.CoilRF, MixerGrid, Osc.CoilHF, MixerGrid, Osc.CollRF, MixerGrid, Osc.CoilRF, MixerGrid , Osc.CoilMixer GridCoilMixer CollOsc. TrimmgCoilIF CoilConv. Plate1st Video IFAdj. Sound IF39. 75MCTrap2nd Video IF3rd Video IF4th Video IFSeries Peak-ing CoilShunt Peak-ing Coll

Series Peak-ing Coil4. 5MC TrapSeries Peak-ing Coil

Sound IFQuadratureCollHoriz. Osc.Anti-ringing

DC RES.

PRI.

on

on

on

on

onononon

on

on

on

on

on

on

on

on

on

on

on

on

ononononon.in.inon.in.in.an

5. sn

5. sn

1.5(1I2n

sn

.sn

4. eni48n

47n

SEC.

.in

.in. 2 f t

I. 2ft

.sn

' Use trap winding and drill mounting* Detune trap.* Series with a 5. 6KS2 resistor.t Parallel with a 5. 6KS1 resistor.* Parallel with a . 01 capacitor.

ITEMNo.

~L32~

RATINGSTOTALDIRECT

CURRENT

.250ADC

D. C.RESISTANCE

sen

INDUC(o aioai.'

Q) Drill one new mounting hole .

PTIONS (Continued)ont) COILS (cont)

RATING

OHMS

22KS2lOKn47KO180KS!6800S!91S! 5%470KS!12Kn22KS233KH100KS!330S!lOKn8. 2n

WATT

REPLACEMENT DATA

ZENITH

PART No.

63-184263-214563-185663-231363-182063-174463-189863-109163-95863-184963-187063-3162

IRCPART No.

BTS-22KBTB-10KBTS-47KBTA-180KBTS-6800BTS-91BTS-470KBTB-12KBTA-22KBTA-33KBTA-100KBT.A-330BTS-10K

NOTES

Note 4Note 4Note 4

>r in this application.T in this application,ir in this application.

its only.

>WER).ACEMENT DATA

lo

TriadPART No

RCATYPE No.

HalldorsonPART No. PART No.

26R33

CIRCUITS)ACEMENT DATA

t

12®

TriadPART No.

DA-36 ®A-108X®

Y-17-1®

RCATYPE No.

2L1D2 (J)

HalldorsonPART No.

DF602 ®

PART No.

Y-7 ®

OUTPUT)

PART No. PART No.

Z1117 24S60

NOTES

,M NOTESNo.

CD Used in Models M2228RZ,M2229RZ, and M2229EZ(2 Used in Models M2250RZ, M2250EZ,M2250RU, M2250EU, M2252RZ, and M2252EZ

DATA

MERITPART No.

MILLERPART No.

NOTES

Channel 2

Channel 3

Channel 4

Channel 5

Channel 6

Channel 7

Channel 8

ITEMNo.

H

I

J

K

L

L8L9L10L11A

B

C

D

E

F

G

H

I

J

K

L

L12

L13L14

L15L16L17L18L19L20L21L22L23

L24

L25

L26L27

L28L29

L30•LSI

USE

AnL , RFGrid CoilAnt., HFGrid CoilA n L , RFGrid CoilAnL , RFGrid CoilAnL, RFGrid CoilFil. ChokeNeut. CollRF CoilRF, MixerGrid, Osc.CoilRF, MixerGrid, Osc.CoilRF, MixerGrid, Osc.CoilRF, MixerGrid, Osc.CoilRF, MixerGrid, Osc.CoilRF, MixerGrid, Osc.CoilRF, MixerGrid, Osc.CoilRF, MixerGrid, Osc.CoilRF, MixerGrid, Osc.CoilRF, MixerGrid, Osc.CoilRF, MixerGrid, Osc.CoilRF, MixerGrid , Osc.CoilMixer GridCoilMixer CoilOsc. TrimmaCoilIF CoilConv. Plate1st Video IFAdj. Sound IF39. 75MCTrap2nd Video IF3rd Video IF4th Video IFSeries Peak-ing CoilShunt Peak-ing Coil

Series Peak-ing Coil4. SMC TrapSeries Peak-ing Coil

Sound IFQuadratureCoilHoriz. Osc.Anti-ringingcoil

DC RES.

PRI.

on

on

on

on

Onononon

on

on

on

on

on

on

OS!

OS!

OS!

on

on

on

onon

ononon. in.inon.in.in.2n

5. 5n

5. 5S!

l. toI2n

sn

.30

4. enI48n

47n

SEC.

.in

.in

.2n

1. 2n

.3S!

REPLACEMENT DATA

ZENITHPART No.

S-19849

S-19850

S -198 51

S-19852

S-1985320-39120-43120-484

S-19862

S-19863

S-19864

S-19865

S-19866

S-19867

S-19868

S-19869

S -19870

S-19871

S-19872

S-19873

20-485S-20181

20-447S-18859S-20902S-21019S-18210S-20622S-17907S-19952S-20623

S-17912

S-21562

5-15128S-21492

S-21563

S-20219

S-19020S-19743

S-21012

MEISSNERPART No.

17-450217-4501 »

19-3160

19-3160 «

19-1005

19-3125 t

16-3445

20-100419-1577

19-3160 .

MERITPART No.

TV-184

TV-184 •

TV-151

TV-184 .

MILLERPART No.

6232

6232 m6233 •6219

4644

4644 .

4612

6153 t

1470

6180 .

NOTES

Channel 9

Channel 10

Channel 11

Channel 12

Channel 13

Channel 2

Channel 3

Channel 4

Channel 5

Channel 6

Channel 7

Channel 8

Channel 9

Channel 10

Channel 11

Channel 12

Channel 13

Includes trap

145 Microhenries

159 Microhenries;wound on 2. 7Knresistor

12 Microhenries

136 Microhenriesjwoundon 5. 6Kn resistor

Tapped Q 58n

163 Microhenries; woundon . 01 cap; used inchassis I9M20Z, 19M21Z,19M20UZ, 19M21UZ,19M20, 19M21, 19M20U,19M21U, 20M21, 20M21U,20M21Z

* Use trap winding and drill mounting hole. ' '

V)—01

«oK)O

NmZ

«O

K)

C

N

Detune trap.• Series with a 5. 6KS2 resistor.t Parallel with a 5. 6KSi resistor.* Parallel with a . 01 capacitor.

FILTER CHOKE

ITEMNo.

L32

RATINGSTOTALDIRECT

CURRENT

.250ADC

D. C.RESISTANCE

66n

INDUCTANCE[0 CURRENT

1000 'XJ

1.7 Hy.

REPLACEMENT DATA

ZENITHPART No.

95-1376

PART No.

C-23260)

MeritPART No.

C-2996Q)

TriadPART No.

C-23X

HalldorsonPART No.

C5037 CD

ThordarsonPART No.

26C44{$) Drill one new mounting hole .

PAGE 17

PARTS LIST AND DESCRIPTIONS (Continued)FUSES

ITEMNo.

Ml

TYPE

3AGSlo-Blo

RATING

.175A125V

REPLACEMENT DATAZENITH

PART No.

FUSE

136-21

HOLDER

83-1883

LITTELFUSEPART No.

FUSE

313. 175[175MA-3AG

Slo-Blo)

HOLDER

357001

BUSSPART No.

FUSE

MDL 1751000

HOLDER

4405

CRYSTAL DIODES

ITEMNo.

M2

ORIG.TYPE

1N60

REPLACEMENT DATA

ZENITH

PART No.

103-1

SYLVANIAPART No.

1N60 or1N132

FEDERALPART No.

1N60 or1N64A

NOTES

Video Detector

MISCELLANEOUSITEMNo.

M3M4

M5M6M7M8M9M10Bl

PART NAME

Dial LightTunerTunerTunerTunerTunerVideo Del. Assy.SwitchCentering DeviceIon TrapIntegratorWidth AdjustmentTrimmer Cap.Cabinet

Cabinet

CabinetCabinetCabinet

Cabinet

CabinetCabinetCabinetCabinetCabinetCabinetCabinetCabinetCabinetCabinetCabinetCabinetCabinetCabinetCabinetCabinetCabinetCabinetSafety Glass

Safety Glass

Safety Glass

Safety Glass

Safety Glass

Safety GlassSafety GlassSafety GlassMask

MaskMask

ZENITHPART No.

100-166S-21060S-20989S-19970S-21000S-19670S-2104285-546S-19898S -1716487-1

22-239814-1648E

14-1648R

14-1650R14-1651E14-1651R

14-1652R

14-1652E14-1655E14-1655R14-1710R14-1740E14-1740R14-1773E14-1773R14-1742E14-1742R14-172914-173014-173114-173214-175014-175114-1741E14-1741H192-176

192-168

192-175

192-178

192-154

192-91 or 192-77192-188192-190196-248

196-259196-261

NOTES

Not used in all models.VHF-UHF - Chassis 19M20, 19M21VHF- Chassis 19M20U, 19M21UVHF-UHF - Chassis 19M20Z, 19M21Z, 19M21UZUHF - Chassis 19M20U, 19M21UUHF - Chassis 19M21UZIncludes M2, L22, L23, L24, C81, C82UHF-VHF changeover - Chassis 19M20U, 19M21UIncludes yoke cover

Horiz. DriveBlonde - Models M1800EZ, M1800E, M1800EU, R1800EZ,RI800EUZ, M2229E, M2230E, M2249E, M2250E, M2252EMahogany - Models M1800RZ, M1800R, M1800RU, R1800RZ,R1800RUZ, M2228R, M2229R, M2230R, M2249R, M2250H,M2252RMahogany - Models M2228RZ, M2228RUBlonde - Models M2229EZ, M2229EU, M2230EZ, M2230EUMahogany - Models M2229RZ, M2229RU, M2230RZ,M2230RUMahogany - Models M2250RZ, M2250RUZ, M2250RU,M2249RZ, M2249RUBlonde - Models M2250EZ, M2250EU, M2249EZ.M2249EUBlonde - Models M2252EZ, M2252EUMahogany - Models M2252RZ, M2252RUMahogany - Model M2230RZ2Blonde - Models H2258EUZ, R2258EZMahogany - Models R2258RUZ, R2258RZBlonde - Models H2257EZ, R2257EUZMahogany - Models R2257RZ, S2257RUZBlonde - Models R1812EZ, R1812EUZMahogany - Models R1812RZ, R1812RUZMetal - Models H2229RZ, R2229RUZMetal - Models H2229EZ, R2229EUZMetal - Models R2230RZ, R2230RUZMetal - Models R2230EZ, R2230EUZModels R2249HZ, R2249RUZModels R2249EZ, R2249EUZBlonde - Models S2250EZ, R2250EUZMahogany - Models R2250RZ, R2250RUZModels M1800E, M1800R, M1800RZ, M1800EZ,M1800HU, M1800EU, R1800EZ, R1800EUZ, R1800RZ,R1800HUZModels M2228H, M2228RZ, M2229E, M2229R, M2229RZ,M2229EZ, M2228RU, M2229RU, M2229EU, R2229EZ,R2229RZ, R2230EZ, R2230RZ, H2249EZ, R2249HZ,R2229RUZ, R2229EUZ, R2230RUZ, R2230EUZ.R2249RUZ,R2249EUZModels M2250RZ, M2250EZ, M2250RU, M2250EU, M2252E,M2252R. M2252HZ, M2252EZ, M2252RU, M2252EUModels M2230RZ2, M2230E, M2230R, M2250E, M2250R,M2230HZ, M2230EZ, M2230RU, M2230EUModels M2249E, M2249R, M2249RZ, M2249EZ,M2249RU, M2249EUModels R1812EZ, RZ, R1812RUZ, EUZModels R2250EZ, RZ, R2258EZ, HZ, R2258RUZ, EUZModels R2257EZ, HZ, EUZ, RUZModels R2250EZ, RZ, R2258EZ, RZ, R2230RUZ,EUZ, R22b8RUZ, EUZModels R2257EZ, RUZModels H2257EZ, EUZ

PAGE 18

CHASSIS BOTTOM VIEW-TRANS., INDUCTOR AND ALIGNMENT IDENTIFICATION

TROUBLE SHOOTING AIDS (cont)

HIGH VOLTAGE

LOSS OF HIGH VOLTAGE

Check by substitution V13, V14, V15, V16 and V17. Check waveform W17.Check Ml fuse.

INSUFFICIENT HIGH VOLTAGE

Check by substitution V14, V15, V16 and V18. Check C77, R94 and otherassociated components.

If Satisfactory

Check T2, T4A, R2, R94, R95, C78,C79 and other associated components.

If Unsatisfactory

Check L30, C74, C72, C73 C78,C77, C71, R86 and other associatedcomponents.

Check by substitution V15, V16, V17 and V18. Check resistance wire to V17filament. Check R94 and other associated components.

GENERAL

RASTER, SOUND, NO PICTURE

Follow procedure outlined under "Loss of Video".

RASTER, PICTURE, NO SOUND

Follow procedure outlined under "Weak or No Sound".

RASTER, NO SOUND, NO PICTURE

Check by substitution VI, V2, V3, V4, V5 and V6. Check video IFcomponents for failure or change of value.

NO RASTER, NO SOUND

Follow procedure outlined under "Dead Set".

KEYSTONE EFFECT

Check T4 and its associated components.

INTERMITTENT STREAKS

Check high voltage section for corona discharge and arcing.

Symptoms shown are assumed and are not indicative of the quality and workmanship of this equipment.

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10

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VHP TUNER TOP VIEW

PAGE 21

SERVICING IN THE FIELD

TUNER OSCILLATOR ADJUSTMENTS

For touch-up adjustment of the VHF tuner oscillator circuit, it is necessary to remove rear cover supply power

to set. Adjustments are made thru the hole marked "Bull's Eye Adjustment" and are accessible one at a time as

the selector switch is turned to each channel. (Fine tuning control must be set to its center of its range before

making adjustments). Use alignment wrench 68-21 for adjustments.

PICTURE TUBE SAFETY GLASS CLEANING

To clean safety glass, remove 2 control knobs from each side of front panel. Remove 2 screws located under

each knob. Remove both rings, then remove safety glass.

PICTURE TUBE REMOVAL

To remove picture tube it is necessary to remove safety glass, rear cover, tube socket, HV lead, ion trap and cen-

tering magnet. Remove 1 screw from top front of tube mount. Remove tube.

SERVICE ADJUSTMENT LOCATION

BULLSEYEADJ.

FRONT PANEL SERVICE CONTROLS

HORIZHOLD

HEIGHT BRIGHTNESS VERT VERT CONTRAST AGE FINEHOLD LINEARITY DELAY TUNING

REAR PANEL SERVICE CONTROLS

BUZZ FRINGELOCK

SPECIAL ADJUSTMENTS - AGO DELAY ADJUSTMENT

Turn the set on and tune in a TV signal and observe the picture. Starting from the full clockwise position turn

the AGC delay control slowly counter clockwise until picture distorts and buzz is heard in the sound. Then

turn control clockwise for clearest picture and best sound.

FRINGE LOCK ADJUSTMENT

Turn the fringe lock control to 1/4 turn from full clockwise position. Adjust the vertical and horizontal hold for

picture synchronization and check stability by switching off channel and back again.

Slightly retouch the fringe lock control adjustment, if necessary, for maximum stability while testing as above.

HORIZONTAL OSCILLATOR FIELD ADJUSTMENT

Adjustment of the horizontal oscillator circuit can be made from the front panel service control. Adjust the

horizontal hold control (L30) until picture synchronizes horizontally. If results cannot be obtained see horizontal

sweep circuit adjustments on page 11.

SOUND IF DETECTOR BUZZ ADJUSTMENT

Adjust the buzz control located on the rear apron of the chassis for maximum volume and minimum buzz. If results

are unsatisfactory see alignment instructions on pages 6 and 7.

FUSES

One fuse is used for horizontal sweep circuit protection. (For location see tube placement chart).

CENTERING

Centering is accomplished mechanically by adjusting two magnetic rings around the neck of the picture tube, located

flush against the deflection yoke. Rotate the two rings around the neck of the tube until the picture is properly centered.

DISASSEMBLY INSTRUCTIONS

1. Remove 5 push-on type control knobs from front panel.

2. Remove 5 wood screws. Remove rear cover.

3. Disconnect speaker leads, and remove 2 speaker nuts. Remove speaker.

4. Remove 4.chassis bolts. Remove chassis.

PAGE 22

SHATT IN MAXIMUM COUNTER CLOCKWISE POSITION.

DRIVE CORD STRINGING

PAGE 23