VG 978 SERVICE MANUAL ( ) TV MONITOR DISPLAV FOR VIDEOGAMES VG CHASSIS CODE N VG " DISPLAY CODE N GENERAL DESCRIPTION

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VG 978 TV MONTOR DSPLAV FOR VDEOGAMES SERVCE MANUAL ( ) VG 978 - CASSS CODE N 083000 VG 978-20" DSPLAY CODE N 083001 GENERAL DESCRPTON The VG 978 TV MONTOR have been designed to give you the best

1 VG 978 TV MONTOR DSPLAV FOR VDEOGAMES SERVCE MANUAL ( ) VG CASSS CODE N VG " DSPLAY CODE N GENERAL DESCRPTON The VG 978 TV MONTOR have been designed to give you the best performances and reliability. Our Display Monitor is build up on strong metal frame and the circuits are all solid state in order to insure long life. t is containing: 1 - POWER SUPPLY TRANSFORMER with very low stray flux, low power consumption and it works at 50 z or 60_z (on demand) 16 - SLCON DODES 1 - V SLCON DODE 12 - SLCON TRANSSTORS 2 - NTEGRATED CRCUTS All the others components are very good selected.

2 TV MONTOR DSPLAY - Mains Specifications - - POWER SUPPLY NPUT. - POWER CONSUMPTON - VDEO NPUT - NPUT MPEDANCE - BANDWDT - SENSTVTY - VDEO AMPLFER - SYNC NPUT - SCANNNG FREQUENCY - PCTURE TUBE - G VOLTAGE - ORZONTAL RETRACE TME - RESOLUTON - CONTROL POSSBLTY - ADJUSTMENTS 110 V.ac/220 V.ac - 50 z ± 10% 35 Watts Composite Video o,5 --;- 3 Vpp (70% video - 30% Sync) Non Composite. Video 0,35 --;- 5 Vpp- Terminated 470 Ohm Unterminated 10 Kohm 7 Mhz --;- 12 Mhz at - 1 db adjustable 0,3 Vpp (Non Composite Video) for 50 Vpp on CRT- DC Restored - Composite Sync 1 --;- 5 Vpp negative input impedance 10 Kohm - orizontal Sync 2 --;- 5 Vpp positive input impedance 20 Kohm - Vertical Sync 2 --;- 5 Vpp positive input impedance 20 Kohm orizontal z - Vertical 50 z orizontal z - Vertical 60 z 20BM6 (A50-120W) 20" deflection 24BM1 (A61-120W) 24" deflection 17 KV rated voltage at O microampere of picture tube current 12 microseconds maximum 560/800 lines minimum at picture centre Scanning phase control with reference to signal video input - Power supply voltage de - Brightness - Contrast - Vertical frequency - Vertical amplitude - Vertical linearity - orizontal frequency - orizon ta phase - orizontal linearity - orizontal amplitude - Focus - ENVRONMENT OPERATON Maximum ambient temperature 50 C - AUDO (TONE BURST AMPLFER) Optional

3 VG CASSS CODE CODE VG " DSPLA V TOP VEW TOP VEW REAR VEW FRONT VEW 454 ' U'> "' + Cl) ~. 414 SDE VEW SDE VEW

4 ( VG DSPLAY - REAR VEW VG CASSS - TOP VEW

5 WRNG DAGRAM BLACK T100 CBL9-78 RED WTE YELLOW YELLOW --~~~~~~~~~~~~~ BLACK 10 RED RED BLACK BOTTOM VEW TO CRT GROUND

,--------=--=--1 NOTES: 1) UNLESS OTERWSt= NDCATED, ALL RESSTORS ARE N OMS, 0.25 W/J AND CERAMC CAPACTORS ARE N PCOFARADS, TE OTER CAPACTORS ARE N MCROFARDS. REFER TO PARTS LST FOR COMPLETE DESCRPTON.

6 , =--=--1 NOTES: 1) UNLESS OTERWSt= NDCATED, ALL RESSTORS ARE N OMS, 0.25 W/J AND CERAMC CAPACTORS ARE N PCOFARADS, TE OTER CAPACTORS ARE N MCROFARDS. REFER TO PARTS LST FOR COMPLETE DESCRPTON. 2) D.C. VOLTAGES TAKEN WT RESPECT TO CASSS GROUND.WT 1V. P-P MPUT COMPOSTE VDEO. VOLTAGE READNGS ARE ± 100/o. 3) FOR ORZONTAL FREQUENCY ADJUSTEMENT TO SORT CRCUT TP - AND TO REGULATE ORZONTAL-OLD TRMMER SO TAT TE MAGE SOULD APPEAR SETTLED ON TE SCREEN. 4) ARMONC CALBRATON N ORDER TO OBTAN BETTER PERFORMANCES YOU SOULD AVE TO MAKE A PRECSE TUNE COLS ALNEMENT ON T 302 TRANSFORMER ACCORDNG TO NEXT PONTS: a) execute every adjustment of sync, geometry, amplitude and linearity with your desired signal; b) connect the signal tracing probe of oscillograph on T 302 insulated terminal {see fig.) so that you can see wave form {Z); c) adjust the brigthness on minimum level so that to see the roster indistinctly; d) adjust L 308 up to reduce on minimum the oscillotion amplitude that you can see on wave form (Z). e) adjust L 306 up to obtain the maximum horizontal amplitude, thereafter to adjust again L 308 so that you should have obtain the smaller amplitude of above mentioned oscillations.. SCEMATC DAGRAM ~ /16 C200 VDEO cillj AMPLFER T 10/250+ C224 c o.: ; :50 C226 F lk R262 CRT200 20BM6 (A50-120W) 820 R208 24BM1 (A61-120W) lok R R212 ~---""11 4K7 R224 5th 1 4,7n/250 -,-~J R342 4K7 R346 R1~~. T300 0,22/100 ~302 C300 fill R330 4 TOA 1180 C /250 C320 t ORZ.!El BD441 TS300 DEFL. YOKE L310 VERT. ORZONTAL ----,i ORZ. OLD m:j + 470/16 C110 POWER SUPPLY!iED 220 R112 Z102 ZPV12 VERTCAL 0,63AM FlOO ,1/250 VAC C CN100 u z 00 DESGN AND SPECFCATONS ARE SUBJECT TO CANGE WTOUT NOTCE /4W -0-1/2 ~ w NW BC 237 BC 307 BC 337 A= 1 V PP CERAMC CAPACTORS L U1 n B= 0 36V PP 2N 3055 BU 6060 E LECTROLTC CAPACTORS SYNTETC FLM CAPACTORS ~ WAVEFORMS 0 -c:j- -ld- 75 RlOO E C B B0441 B0442 E C B BF 717 BF 757 LJ F= ev PP JL_J 6= V PP c = 1,i3 v pp = 44Y PP ~ Lil l) tu VL LJ E = i14 V PP A JU ru =?4.V PP = 9 V PP J=08VPP K = 46 V PP LJ P: 38 V PP L-0,62VPP LJ V Q=1.5VPP M=Z40VPP R= 2 6V PP v 0=22VPP v n L V1 v =.5VPP V 5=0.1VPP V T:?n V PC> "

7 OPERATNG NSTRUCTONS 1. The TV Monitor works normally at 220 Voe / 50 z and with CCR standard composite video signal. 2. f it is necessary connect 110 Vac, you must reverse the connections of T 100 as indicated on print circuit. 3. For horizontal frequency adjustment to short circuit TP - and to regulate horizontal-hold trimmer so that the image should appear settled on the screen. 4. S'h ARMONC CALBRATON n order to obtain better performances you should have to make a precise tune coils alinement on T 302 transformer according to next points: a) execute every adjustment of sync, geometry, amplitude and linea. rity with your desired signal; b) connect the signal tracing probe of oscillograph on T 302 insulated terminal (see fig.) so that you can see wave form (Z); c) adjust the brigth ness on minimum level so that to see the raster indistinctly; d) adjust L 308 up to reduce on minimum the oscillation amplitude that you can see on wave form (Z); e) adjust L 306 up to obtain the maximum horizontal amplitude, thereafter to adjust again L 308 so that you should have obtain the smaller amplitude of above mentioned oscillations. Z NPUT CONNECTONS Composite video input 0,5 -;- 2,5 Vpp. Connection for 470 Ohm input impedance Connection for 5 K Ohm input impedance. N:~1 <6 l N2. 3 V DE 0 4 V DE 0 ~1 5 Composite and non composite video input 0,5 -;- 2,5 Vpp. Composite negative sync input 1 --:- 5 Vpp. with 10 K Ohm input impedance 4<: Connection for 470 Ohm input impedance Connection for 10 K Ohm input impedance. VDEO N 3 ~ 1 4< 6 2 'SYNC N~. 5 Composite and no~ VDEON < composite video input 0,5 -;- 2,5 Vpp. 6 2e SYNCN1( 5 orizontal positive sync input 2 --:- 5 Vpp. with 40 K Ohm input impedance Vertical positive sync input 2--:- 5 Vpp. with 25 K Ohm input impedance Connection for 470 Ohm input impedance Connection for 10 K Ohm input V DE 0 3. OR ~ R impedance N 27 ~ e SYNC N. V DE 0 N e SYNC N.., VERT VERT... 5

8 REPLACEMENT PARTS LST POWER SUPPL V REF. PART N. REF. PART N. RESSTORS R100 Resistor 75 Ohm 15 W-J R212 Resistor 470 Ohm 0,25 W-J R102 Resistor 470 Ohm 1 W-J R214 Resistor 18K Ohm 0,25 W-J R104 Resistor 1 K Ohm 0,25 W-J R216 Resistor 47K Ohm 0,25 W-J R106 Resistor 2K2 0,5 W-J R218 Resistor 100 Ohm 0,25 W-J R108 Resistor 4K7 0,25 W-J R220. Resistor 270 Ohm 0,25 W-J R110 Resistor 1 K Ohm 0,25 W-J R222 Resistor 100 Ohm 0,25 W-J R112 Resistor 220 Ohm 4 W-J R224 Resistor 4K7 0,25 W-J R114 Resistor 0,39 Ohm 1 W-J 303E39 R226 Resistor 56K Ohm 0,25 W-J R228 Resistor 2K7 0,25 W-J R230 Resistor 33K Ohm 0,25 W-J CAP,ACTORS R232 Resistor 4K7 0,25 W-J R234 Resistor 10 Ohm 0,25 W-J C100 Film capacitor 0,1MFD 250VAC M-P R236 Resistor 220 Ohm 0,25 W-J C102 Electr. capacitor 2200 MFD 50V-AX R238 Resistor 1K Ohm 0,25 W-J C104 Electr. capacitor 10 MFD 35V - P.C R240 Resistor 47 Ohm 0,25 W-J C106 Film c~pacitor 0,047 MFD 250V P10-M R242 Resistor 680. Ohm 0,25 W-J C108 Electr. capacitor 1000 MFD 40V - P.C R244 Resistor 4K7 0,25 W-J C110 Electr. capacitor 470 MFD 16V - P.C R246 Resistor 1K Ohm 0,25 W-J R248 Resistor 1K Ohm 0,25 W-J DODES AND TRANSSTORS R250 Resistor 220 Ohm 0,25 W-J R252 Resistor 180 Ohm 0,25 W-J D100 Rectifier Diode BY251 F. 3A VR 200V R254 Resistor 22 Ohm 0,25 W-J D102 Rectifier Diode BY251 F. 3A VR 200V R256 Resistor 8K2 3 W-J D104 Rectifier.Diode BY251 F. 3A VR 200V R258 Resistor 1K5 0,25 W-J D106 Rectifier Diode BY251 F. 3A VR 200V R260 Resistor 1K5 0,25 W-J D108 Diode 1 N R262 Resistor 1K Ohm 0,25 W-J Z100 Zener 5,6V ZPD 5V6-0,5 W R264 Resistor 1K5 0,5 W-J Z102 Zener 12V ZPY 12-1,3 W R266 Resistor 1M Ohm 1 W-J TS100 Transistor 2N R268 Resistor.1 M Ohm 1 W-J TS102 Transistor BD R270 Resistor 22 Ohm 0,25 W-J TS104 Transistor BC ( CONTROLS AND TRANSFORMERS T100 Power Transformer P100 Carbon Trimmer 470 Ohm 0,25 W CONTROLS P200 Carbon Trimmer 470 Ohm 0,25 W P202 Carbon Trimmer 1K Ohm 0,25 W P204 Miniature Trimmer 470 Ohm 0,125 W CAPACTORS C200 Electr. capacitor 22 MFD - 16V - P.C , C202 Electr. capacitor 100 MFD - 16V - P.C C204 Electr. capacitor 22 MFD - 16V - P.C VDEO AMPLFER C206 Electr. capacitor 22 MFD - 16V - P.C C208 Electr. capacitor 220 MFD - 16V - P.C C210 Electr. capacitor 4E7 MFD - 16V - P.C C212 Electr. capacitor 100 MFD - 16V - P.C RESSTORS C214 Film 0,1 MFD - 100V - M - P C216 Ceramic capacitor 100 PF - 25V - M R202 Resistor 10K Ohm 0,25 W-J C218 Ceramic capacitor 470 PF - 25V - M R204 Resistor 100 Ohm 0,25 W-J C220 Electr. capacitor 22MFD - 16V - P.C R206 Resistor 56K Ohm 0,25 W-J C222 Film cap. 0,047 MFD - 250V - M - P R208 Resistor 820 Ohm 0,25 W-J C224 Electr. capacitor 10 MFD - 250V - AX R210 Resistor 220 Ohm 0,25 W-J C226 Film cap. 0,1 MFD - 250V - M - P

9 ., REF. PART N. REF. PART N. DODES, TRANSSTORS AND C.R.T. CAPACTORS D200 Silicon diode 1 N C300 Ceramic capacitor 120 PF 50V-K D202 Silicon diode 1 N C302 Film capacitor 0,22 MFD 100V-M-P D204 Silicon diode 1 N C304 Film capacitor 0,47 MFD 100V-M-P D206 Silicon diode 1 N C306 Film capacitor 0,1 MFD 100V-M-P D208 Silicon diode 1 N C308 Film capacitor 0,68 MFD 63V-M-P D210 Silicon diode 1 N C310 Electr. capacitor 4E7 MFD 16V - P.C TS200 Transistor BC C312 Film capacitor 0,1 MFD 100V-M-P TS202 Transistor BC C314 Film capacitor 4E7 nf 630V-J-P TS204 Transistor BC C316 Film capacitor 0,22 MFD 100V-M-P15 TS206 Transistor BC C318 Electr. capacitor 100 MFD 16V - P.C TS208 Transistor BC C320 Film capacitor 10 nf 250V-M-P TS210 Transistor BC C322 Film capacitor 0,22 MFD 100V-M-P TS212 Transistor BF C324 Film capacitor 0,033 MFD 400V-J CRT200 Cathode ray tube 20BM6/ A50-120W C326 Film capacitor 2E7 MFD 250V-K-P27, or 24BM1/ A61-120W C328 Ceramic capacitor 470 PF 500V-M C330 Electr. capacitor 100 MFD 63V-AX C332 Electr. capacitor 10 MFD 250V-AX C334 Film capacitar 22 nf 630V-M-P C336 Film capacitor 0,1 MFD 630V-M-P22, C338 Film capacitor 47 nf 250V-M-P ORZONTAL DODES - TRANSSTORS AND l.c. D300 Fast recovery diode RGP RESSTORS or 2X 8A D302 Fast recovery diode BA R300 Resistor 2K7 0,25 W-J TS300 Transistor R302 Resistor 1K5 0,25 W-J TS302 Transistor 8406-D R304 Resistor 1 M5 0,25 W-J C300 ntegrated circuit-tda R306 Resister 1 M5 0,25 W-J R308 Resistor 4M7 0,25 W-J R310 Resistor 820 Ohm 0,25 W-J R312 Resistor 2K7 0,25 W-J R314 Resistor 4K7 0,25 W-J TRANSFORMERS AND COLS R316 Resistor 1K2 0,25 W-J L300 Chocker 50 u R318 Resistor 100K Ohm 0,25 W-J L302 Linearti-or ( R320 Resistor 82K Ohm 0,25 W-J L304 oriz. Width R322 Resistor 10K Ohm 0,25 W-J T300 oriz. Dryver R324 Resistor 22K Ohm 0,25 W-J T302.V. Transformer R326 Resistor 56K Ohm 0,25 W-J Deflection Yoke R328 Resistor 560 Ohm 0,25 W-J R330 Resistor 82 Ohm 10 W-J R332 Resistor 22 Ohm 0,5 W-J R334 Res.istor OE5 Ohm 0,5 W-J 3020E5 R336 Resistor 39 Ohm 0,5 W-J R338 Resistor 1K Ohm 0,5 W-J R340 Resistor 1M Ohm 1 W-J R342 Resistor 47 Ohm 0,25 W-J R344 Resistor 47K Ohm 0,25 W-J VERTCAL R346 Resistor 4K7 0,25 W-J R348 Resistor 470 Ohm 0,5 W-J RESSTORS CONTROLS R400 Resistor 8K2 0,25 W-J R402 Resistor 8K2 0,25 W-J R404 Resistor 150K Ohm 0,25 W-J R406 Resistor 330K Ohm 0,25 W-J P300 Carbon trimmer 220K Ohm - 0,25 W R408 Resistor 33K Ohm 0,25 W-J P302 Carbon trimmer 22K Ohm - 0,25 W R410 Resistor Ohm 0,25 '!'J-J 3011EO P304 Carbon trimmer 4M7 Ohm - 0,5 w R412 Resistor 47K Ohm 0,25 W -J

10 REF. PART N. REF. PART N. DODES AND l.c. R414 R416 R418 R420 R422 R424 R426 P400 P402 P404 C400 C402 C404 C404 C406 C408 C410 C412 C414 C416 C418 C240 C424 Resistor 120K Ohm 0,25 W-J Silicon diode 1 N W02 Resistor 3E3 Ohm 0,25 W-J 3013E3 C400 ntegrated circuit - TOA Resistor 5K6 0,25 W-J C400 ntegrated circuit - TDA Resistor 12K Ohm 0,25 W-J Resistor 12K Ohm 0,25 W-J Resistor 180K Ohm 0,25 W-J Resistor 100 Ohm 4 W-J MECANCAL PARTS CN100 Mate-N-Lock AMP / PN 1/2/3/4/5/6 - AMP / CONTROLS PTF100 Fuse holder 5 x 20 - P.C F100 Fuse 0,63 A-M Carbon trimmer 220K Ohm 0,25 W CN300-M Male Connector PCP-CFM Carbon trimmer 100K Ohm 0,25 W CN300-F Female Connector CFF Carbon trimmer 100K Ohm 0,25 W CRT Socket - CN CRT Socket - PCB Trimmer Schatt 0 4 L20 mm Lateral C.R.T. support right CAPACTORS Lateral C.R.T. support 'left Spring for Resistor R Ceramic capacitor 4E7 nf 50V-M C. 16 PNS Socket AMP / Ceramic capacitor 4E7 nf 50V-M DS100 eat Sink TS Film capacitor 0,1 MFD 160V-J-P DS300 eat Sink TS Film capacitor 0,1 MFD 160V-J-P Frame Film capacitor 0,1 MFD 160V-J-P Support for CN Film capacitor 0,1 MFD 160V-J-P PCB 9-7a Ceramic capacitor 220 PF 50V-K Film capacitor 0,22 MFD 100V-M-P Electr. capacitor 22 MFD 16V-P.C., Electr. capacitor 1000 MFD 25V-P.C. " Electr. capacitor 100 MFD 25V-P.C Electr. capacitor 1000 MFD 16V-P.C Ceramic capacitor 470 PF 50V-M Giessener Str LC Germany ~ / Telex games Technical Service ~ 06404/2073 a>,.... <r- (Y)

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