Vectrex Trouble Shooting Guide

8/4/2019 Vectrex Trouble Shooting Guide

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GENERAL CONSUMER ELECTRONICS, INCVECTREX TROUBLE-SHOOTING GUIDE

- ., .........


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The folowing t roub le - shoo t ing guide assumes a genera lunders tanding o f T.V. e l e c t ron ic s and d i g i t a l techniques . Aswith a l l Consumer r epa i r , a complete explanat ion of the problemcan prove invaluable in determining the problem.Timely r e pa i r s can be accomplished with a "GCE" maintenance Tes tCart r idge ( l a t e s t Revision) , Vectrex Service Manual and t h i sTrouble-Shoot ing Guide.A ll repa i r s w i l l r equ i re the removal of the r e a r cover! CAUTION,the re ta in ing screws are f ine - th readed metr ic (# .7) and are ,sub jec t to easy cross - th read ing when r ep laced .Most repa i r s w i l l be PCBA replacement a t f i r s t , but with a littleexper ience , component l e ve l r e pa i r s can be made. Replacingcomponents w i l l r equ i re exper t so lder ing t echniques to insurec or r e c t opera t ion .


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REQUIRED TOOLSAND

TEST EQUIPMENT\

1. Tes t Car t r idge (La tes t Revis ion)2. Maintenance Manual (VECTREX )3. Sta r t -up Par t s K it (VECTREX )4. Temperature Contro l led Solder Sta t ion5. General Hand Tools6. Osci l loscope (2 CHAN.)7. DVM/DMM8. High Voltage Probe Meter9. General T.V. Adjustment Tools


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T EST C A R T RID G E

PRO C E D U R E


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TEST CARTRIDGE DESCRIPTIONS

TEST #1Descr ip t ion : GCE Ti t l e Page(F ig . 1 )1. Insure th e fol lowing ev en t s happen uponPower-up o f u n i t with Tes t Car t r idge inp lace .

A. VECTREX Announcement:

B.

1. Border l i n e s p a r a l l e l witheach othe r & s i d e s o f t ube .2. Pr in t ing comple te and s t r a i g h to r with only s l i g h t s l a n t .In t roduc to ry Tune:1 . Sounds are c l e a r .

TEST #2Descr ip t ion: Ca r t r idges T i t l e Page

(F ig . 2 )1. Afte r 10 seconds , +/-5%, second titlepage w i l l be displayed au to ma t i ca l l y .Also, any t ime you h i t r e - s e t withu n i t on and Tes t Car t r idge in p lace ,T es t title page w i l l be di sp layed .

,, ,

I . ,

~ - - - - - --,1,------ ,_- I I 1I I Y . ~ T " r l I 1I I I II I I III I II I I II I GeE I 1I I ENTERTAINING I II I NEW I D ~ . u I II L _ .-. _ __ J IL ________

FIGURE -1

o

TEST ftfV. 4@ GeE 19a1

FIGURE 2 -


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-.

IITEST #3D esc r i p t i o n : Linear i ty Pa t te rn(F ig . 3)1 . Afte r 5 seconds , t h i s di sp lay w i l l

appear au toma t i ca l ly .2. The p a t t e r n i s used to check th efo l lowing :

A.B.C.D.

Pic tu re Geometr ica l D is to r t i o nV er t i c a l SizeH o r i zo n t a l SizeCenter ing

3 . Press But ton #4 to move to th e nex t t e s t .Do not depress Button #3 or the c o n t ro l -l e r t e s t (#13) w i l l be disp layed andBut ton #1 and #3 o r #4 must be d ep res seds imul taneously to e x i t .

TEST #4Desc r ip t ion : DAC O ff s e t Adjus tment

(F ig . 4)1 . This t e s t i s used in con junc t ion with a

DVM or scope to s e t th e DAC o f f s e t p o t 'R302. See t e s t procedure in l a t e r s ec -t i on of t h i s manua l .2 .

3.

This t e s t w i l l d i s p l ay th e s t a t ement ,"ADJUST DAC OFF- SET", fo r a s h o r t t imeeach 6 seconds . The ad jus tment R302must only be done when t h e se words a reo ff th e sc reen .To move to an o th e r t e s t when d isp lay i s"on" , h i t c o n t o l l e r But ton #3 o r Button#4 to move to T e s t #3 o r T es t #5 r e s p e c -t i v e l y . Rese t maybe h i t a t anyt ime tor e tu r n to title page .

4. But ton #4 must be depressed to advanceto the nex t t e s t and But ton #3 t o r e tu r n _to the p rev ious t e s t .Anytime T e s t #13, th e Hand C o n t r o l l e rT es t i s d , i sp layed , But to!!. #1 and e i t h e r ,But ton #3 or. # 4 mus t be depressed toe x i t t h a t Tes t .

l-HORIZ. SIZELOCATION LINE2-VERT. SIZELOCATION LINE

-..r

.....

2

2FIGURE 3

-

..J

A D ~ U " T DAC OF,..5IT

fIGURE 4


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TEST #5Descr ip t ion: In t e g ra t o r O f f se t(Fig. 5 )1. A ll l i ne s must meet and be con t inuous .

2.NOTE: Please use bottom d i s p l ay f o rchecking.Allowable Offse t o th e r than bottom d i s -plays can be 1/2 o f a l i n e o f f s e t .Refer below.

GOOD UNACCEPTABLE

TEST #6Desc r ip t ion : Check Sum

1.

(Test C ar t r i d g e Rev. 4)(F ig . 6)

During performance of forming checksum,d isp lay #1 i s near cen t e r of tube and i sf l a sh i n g . Display #2 comes l a t e r (5se c . ) and s t ays . To do another check-sum, s e l e c t an ad j acen t t e s t then im-media te ly r e tu rn to t e s t #6.Please note the Checksum B796 i s th eDomestic Checksum. It w i l l appear fo rth e In t e rna t iona l Execut ive I or fo r th eIn t e rna t iona l Execu t ive I I in newer p ro -duc t ion .

r

,.,

INTEGRATOR OFFSET

FIGURE 5- .......

FOAMING CHECK"UH(DISPLAY 1)

CHE'CKSU" I : 8'196(DISPLAY 2)

FIGURE 6


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TEST #7Descr ip t ion : Def lec t ion P r o t ec t(Fig . 7)1. When se l e c t e d th e words "Def l ec t ion Pro

t e c t " w i l l appear then t he sc reen w i l lbe blank fo r 6 seconds , the d i sp lay w i l ls t a r t a t ha l f s i zean d grow to f u l ls i z e . Insure p a t t e rn #2 does n o t s t a r tas a d o t and grow; it should s t a r t a t1/2 f u l l - s i z e . NOTE: In t e n s i t y a d j u s t ment w i l l e f f e c t d isp lay . Please r e f e rto T es t #9.

TEST #8Descr ip t ion : Sound T e s t

(Fig . 8)1 . Words "CHANNEL A" w i l l appear on bottomo f th e s c r een , a t th e same t ime a tonegoing from low to high , smooth ly and

con t inuously w i l l be aud ib le .2.

3.

4.

Words, "CHANNEL B" wi 11 appear in th emiddle o f the sc reen and th e sameaudible tone w i l l be heard ."CHANNEL C" w i l l be displayed a t the topo f th e d isp lay with th e same tone as in#1 and #2.Words w i l l nex t appear in the cen t e r ofth e d isp lay "NOISE ALL CHANNELS". Therew i l l be sound l i k e s t a t i c or "gun shot"fo r a sh o r t d u r a t i o n , then the sc reenw i l l go blank fo r a few seconds . Twoo ther sounds w i l l be heard , which areCPU gene ra t ed . This t e s t runs over andover withou t Opera to r i n t e rv e n t i o n .

FIGURE 7 ,

C H A ~ " ' r L cCWANN

NO . . . . ALL. CHAHNn.

CHANNI'L A

- .

FIGURE 8


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TEST #9Descr ip t ion : In t e ns i ty Adjus t

(F ig 9)1 . The word .. INTENSITY" wi 11 appear with 1 7

equa l ly spaced l i n e s running hor i zon-t a l l y acros s t he s c reen . The 2nd, 3rd ,and 4th l i ne from the top should no t beseen , but the 5 th l i n e , j u s t on top ofthe word, "INTENSITY" must be v i s a b l e .Adjus t br igh tness i f necessa ry to meetthe requi rements above.

TEST #10Descr ip t ion : Focus Tes t

(F ig . 10)1 . The l i ne packe ts in th e c e n t e r of the

screen should be sharp wi th a wel l d e-f ined space between each l i n e . Four (4)corner l i ne packe t s should e x h i b i tminimum unfocus .

TEST #1 1Descr ip t ion : Dis to r t ion T e s t One(F ig . 11)1. A boarder of t r i a n g l e s w i l l appear on

th e sc reen wi th th e work "DISTORTION"in th e cen t e r . Check t h a t a l l t r i a n g l e sare symmet r i ca l in appearance .

INTENSITV -------

FIGURE 9

FIGURE 10

FIGURE 11


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#12D is to r t i o n T e s t Two(F ig . 12). The words "DISTORTION 2" w i l l be d i s -

played in th e cen t e r o f 16 p r o g r e s -s i v e l y l a rg e r r ec t an g l e s t r aced aroundit.

The spac ing o f each s ide must be th esame fo r each succeed ing r ec tang leand th e o v e ra l l p a t t e rn must be sym-m e t r i c a l .

#13Key panel T e s t(F ig . 13) I. NOTE: When you have en te red t h i s l a s tT e s t P a t t e rn , you must h i t "Reset" tochange t e s t , o r hold down #1 keybut ton and h i t #3 key b u t to n to moveback to T es t #12 o r #4 key b u t t o n tojump to T es t #3.

. A f te r t e s t i ng c on t ro l l e r in plug #1,

KEY 1

* 0th e r i g h t c o n t r o l l e r p o r t , move to **plug #2, th e l e f t c o n t r o l l e r p o r t andr e t e s t c o n t r o l l e r .

. Press Buttons 1 th ru 4 consecu t ive ly :The

symbol must appear as each but tonpushed in th e ap p r o p r i a t e squa re . e;11 I

FIGURE 12KEY 2 KEY 3

0 00 0*Le f t Cont ro l l e r

**Right Cont ro l l e r

0 00 00 0 DO0 00 0

FIGURE 13

KEY 4

00

0 0

,,

tII'I

r,

1

,,i

,IIIt


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4. Displace the j oys t i ck 90 degrees to ther i g h t s lowly . The symbol as above mustappear f i r s t in th e box c l o s e s t to thecente r , then disappear and the ou te r boxmust ind ica te the symbol. There w i l l bea l i ne t h a t extends from the center ofthe diagram in the d i r e c t ion the joys t i ck i s pushed. Check a l l four (4)d i r e c t ions and check t h a t the appro-pr i a t e box l i gh t s up.Remove th e hand c o n t ro l cord from r i g h tp o r t and move it to the l e f t p o r t . Re-peat the above t e s t .NOTE: I f the l e f t joys t ick i s not p lugged in , one of the inner boxes w i l ll i g h t because of the lMEG pul l -up re s i s t o r i n t e r n a l to th e VECTREX. Noboxes should l i g h t on e i t h e r p o r t fo rwhich a con t ro l l e r i s plugged i n to whenth e joys t i ck i s a t r e s t .


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'SYMPTON TOOLS/EC. NEEDED,Unit wi 11up. not Power YOMPhilips Scredriver

GCETROUBLESHOOTING GUIDEVECTREX SYSTEMNOTE: VECTREX Orientation is frothe Rear Left to Right.

TEST PROCEDURE- Measure resistance at A/C plug (set YOM to OHMS scale IX)should read 10 to 21 OHM +/- 5%.- CAUTION: AC Switch SW301 is located on secondary sideside of nOl.- Remove rear cover - REF. Pg. 11, Service Manual HP3000.

P'ROBABLE CAUT101 PRIMARYopen or shorte

- Check Fuse F101. F101 Open.- Check SW301 - Turn unit onside (CAUTION: Damage can be SW301 open or done) and make a continuity check of the A/C switch.

- - - - - - - - - - - - - - - ~ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ~ - - - - - - - - - - No Vector YOMIntermitten Vector DMM/DVMIntensity bad Scope

Shop ToolsTest Cartridge

I I I I I I I I I I I I I , , , , , ,

- Select Test #3.- Check for +/- 5 VDC and -13 VDC at connector J204Left to Right -5, GND, +5, -13.- Measure AC input voltage to power supply PCB.- EP105 (center tap) to EP106 = 8.6 VAC.- EP105 (center tap) to EP104 - 8.6 VAC.- CAUTION: When replacing Power Supply wires, insure youcheck continuity on both sides of P/$ PCB.- Check that there are no shorts between the +9 and -9

power supply to GND. (T503 (IN) - T401 (IN) ).- Remove T401 or T503_ and check that t h e ~ e are no shortsto GND.- Check for short between heat sink (on Power Board) andIC401 heat sink.

I I I I

0101 - 0104IC 101, 102IC 207T101Fl01

Q502IC 401T502


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.SYMPTONNo VectorIntermitten VectorIntensity bad

TOOLS/EC. NEEDEDVOMDMM/DVMScopeShop ToolsTest Cartridge

I I I I I I I I I I I I

- ... '

GCETROUBLESHOOTING GUIDE NOTE: VECTREX Orientation is frothe Rear Left to Right.VECTREX SYSTEMTEST PROCEDURE

- C e c k S gna1 Wave orm (X, Y, & Z ax s- See A t t a c h . 1)(Red Blue Yellow)

at J402 on Logic PCB. Refer to Page 15, WAVE FORMS"A".Also check these same signals at EP401-404 (Y,Y,)and EP506 on Power PCB same Waveforms as above.Connect scope: EXT. SYNC to PIN 9 of lC302, setscope CHAN. A to .2 volts/Div. and Time/Div. to Ims.

- Select TEST #4.

plROBABLE CAUIC303IC302IC301IC401IC501

- Check Signal Waveform at PIN 7 and PIN 8 of IC401 (no DClevel is carried) Refer to Page 15, WAVEFORMS "B". IC 401Set Scope: Same as above except Volts/DIV. = .02Time/DIV - 2 ms.NOTE: Waveform is seen only when "DAC OFFSET" isdisplayed.

- Check supply voltage at CRT PCB PINS 2 (+40), 3 (+.3 mv), No Z axis is a5 (-29 to +3 brightness control) and 6 (+135).(A11 + - 10%)- Check Z Axis Waveform at PIN 2 of CRT socket (EP505)Page 15.- Connect Scope: Ext.-SYNC. to PIN 9 of lC303.- SET Scope: Volts/Div. = 2 and Time/Div. - Ims.

, , ,

Intermittent ocontact of CRTP501.Q503Q505Open CableIC303IC302

I I I I I I


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'SYMPTONNo sound,Abnormal sound onCHAN. A, B or C&CPU.Weak sound, distor-ted sound, ornoisey sound.

I I I I I I I I I I I I I I I

TOOLS/EQ. NEEDEDVOM, ScopeTest Cartridge

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GCETROUBLESHOOTING GUIDEVECTREX SYSTEM

NOTE: VECTREX Orientation is frothe Rear Left to Right."

TEST PROCEDURESELECT TEST #8- Check for signal on IC 208 PINS 1, 4, and 5.

NOTE: Chan. A = PIN 5, Chan. B = PIN 4 andChan. C = PIN 1.- Set Scope: VOLTS/Div. - .5V Time/Div. = 5 ms.- Check continuity between J302 on Logic PCB & 302 onPower PCB.

NOTE: Black audio cable can notloss of audio will occur.make continuity check youinside connectors.be inverted end for end,Also insure, when youdo not bend contacts

- Check signal Waveform at PIN 8 of IC103 and PIN 1 ofJ103 (Speaker Cable), both should be the same.NOTE: The Waveforms will be different for each sound.

- Set Scope: Volts/Div. = .02; Time/Div. = 5 ms.- When checking volume control, place scope probe onPIN EP108 and turn volume control up to see same Waveforms as above, also check wave forms at J103 'PIN 1.

NOTE: Check that audio cables are routed away fromyoke and al l IC areas when possible.-

I I I I

P'ROBABLE CAUIC 208IC 302IC 207R341 - R346C-224Volume ControlSpeakerCable


15/18

'SYMPTON TOOLS/EC. NEEDEDRipple in Picture YOM

haking or Flashing DMM/DVMScope

Picture distortionPincushioning,Barreling andkeystoning.

Abnormal sound &pi cture whil etapping.

Test Cartridge

Shop toolsTest Cartridge

Shop toolsMeter

, , , , , ,

GCETROUBLESHOOTING GUIDEVECTREX SYSTEMNOTE: VECTREX Orientation is frothe Rear Left to Right.

TEST PROCEDURESELECT TEST #3- Check ripple on + and - 9VDC and 5 VDC power suppliesat T503 (IN), should be less than .05V.- Set Scope: Volts/DIY. = .01 Time/DIV. 5 ms (AC)- Check AC voltage between GND and EP104 and EP106.

EP104 = 8.5 VAC +/- 10%EP106 = 8.5 VAC +/- 10%- Set Scope: Volts/DIY. 1 Time/DIV. 5 ms

Internal SYNC.- Check Waveform at PIN 7 of T502, Refer to Page 15 ofmanual.- Check ripple Waveform at G1 (PIN 5) CRT. PCB.(Maximum 400 mv).- Check output Waveform at PIN 10 and PIN 5 of IC401 -These waveforms should be the same.- Set Scope: Volts/DIV. = .05 Time = Sync externalSELECT TEST #1- Loosen yoke clamp, push yoke tight against CRT bell.-Orient yoke to correct axis; tighten clamp. If dis-tortion is still not acceptable, inspect yoke magnets.- Do visual inspection of unit taking careful note of al lconnectors, IC sockets and areas previously repaired.

I I I I I I I

plROBABLE CAUD101 - D104C111 & C110T101C514, C515IC401

Yoke magnets mBad yoke wind


16/18

SYMPTONicture off-center

incorrect

Poor letteringDi s play, i. e. ,Tilt & size

Picutre sizechanged andunstable wheninput voltageis normal

I I I I I

TOOLS/EC. NEEDED

Shop toolsScope

Shop tool s-ScopeDMM/DVMVOMTest Cartridge

ScopeDMM/DVMTest Cartridge

. .

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GCETROUBLESHOOTING GUIDEVECTREX SYSTEM

TEST PROCEDURE

NOTE: VECTREX Orientation is fromthe Rear Left to Right.

plROBABLE CAUSELECT TEST #3 Adjustments in- Refer to Page 12 of manual - ilLogic Board- Refer to Page 15 of manual - "Power Board

SELECT TEST # 4. -" - . .~ - ' l x i DAC 0 l\djusblent'- . ,

- Do i n t e r g r a t o r OFF - SET a d j u s tmen tpage 15 of manua l .

- SELECT TEST #5SELECT TEST #3- Check voltage at PIN 5 and PIN 8 of IC501

PIN 5 = 5VDC +/- 5%PIN 8 = 3VDC +/- 5%

Adjustments".Adjustments".

(Refe r to

- Check waveform at PIN 7 of T502 and base of Q502,these should be the same.- Disconnect C504, check waveform at PIN 3 of IC501,adjust R 525 and R 526 to conform to display on wave-forms section (Refer to Waveforms, C) Page 15.- Set Scope: Volts/DIV. = 1 Time/DIV. = .1 msinternal.

, , , , , ,

IC305IC303IC301IC401Q301

IC305IC303IC301R 333R 335C501, C517IC501R 505T 501R 527T 502


17/18

,

SYMPTONSlanting ofannouncementand sub-titledisplay.

Picture dis-tortion - longand short ofpicture.

TOOLS/EQ. NEEDEDShop toolsTest Cartridge

ScopeDMM DVM Test Cartridge

I I I I I I I I I I I I I I I I I I I I I I

GeETROUBLESHOOTING GUIDE

VECTREX SYSTEMNOTE: VECTREX Orientation is fromthe Rear Left to Right.

TEST PROCEDURESELECT TEST #1- Display of Title Paqe tilted, replace IC302.S'.- Print inq- inside Title Page is slanted, replace IC301.

.

SELECT TEST #3Check Si nal waveform at J301 X Y, )I\Compare these to Signalr2spectively (return to at R413 and R406 onsignal).

/,.

Power PCB

P'ROBABLE CAUS

IC302IC301

Q 01I\ IC401Mounting methodIC401.

I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I


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ATTACHMENT 1

VECTREX ft

WAVEFORMS

x Y

X =A

Y =.. . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . .Z =

IC 401..

PIN 7B

IN 8

IC 501 n'OJJ$PIN 3 I I I~ 5 0 P S J301

D II f I:::C PCB1X(R) Y(BL) Z(Y)

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Vectrex Trouble Shooting Guide