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SERVICE MANUAL
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1. 3 liege ee pcc pu 1 EEUU NO PICTURE AND NORMAL SOUND NTSC COMPOSITE Touch ground lead of volt ohm meter ohm range for very short time to pin 6 of Q501 A click noise appears Connect positive lead to chassis ground Yes Turn contrast control Check Replace Signal Input Board Circuit Q124 Q125 Q126 Screen brightness varies Yes Short for a moment between emitter and base of Q208 e ears Measure voltage at pin 6 of Raster appears Q501 2 3V No Yes Check Replace Check Replace Check Replace Video amp circuit Q126 D122 Q208 Q501 Connect capacitor 0 047 uF between pin 6 and pin 4 of Q501 Picture appears No Yes Check Replace Connect capacitor 0 047 uF between pin 7 and pin 4 of Q501 Picture appears Q501 No Y es Check Replace Check Replace X201 Q501 NO PICTURE RGB NTSC COMPO OK Check the DC voltages at 5V line Check the DC voltages at the emitter of Q104 0105 0106 4 6 Check the voltages at 8 10 12 of Q108 Changing the input signal from White to Black change the voltages Check Replace Q109 Q114 Q115 Q116 NO RASTER RGB NTSC COMPO OK Turn RGB Sub Brightness R256 Check the DC voltages at 12V line Check the DC voltages at 14 17 20 of 0121 6 7 Ly NG Check Replace 0111 0117 NG Check Replace
2. 2SC2229 x3 eSA949 x3 INV 25 7526 or O AMP J CLAMP 2SCIBISY or O VIDEO 405 M K BP BUFFER 2SAIOI5Y or O BUFFER x O escigisy BSCIBIEY Yo or O or O CONT o RG8 Sub BRT Sub BRT BRIGHT VER OUT 2SCI8I5 Y DRIVE 254940 2SCI815 Y or O 25 2230 SITO P 22 E 2SA 1206 x 2 BUFFER oe 2SC752GTMY dus at Our COMP SYNC C 25 815 Y x4 er 25 2482 FA 1 i SYNC CHANGE OVER ON HEIGAT SCREEN REGU 250880Yx2 2SCIBISY 5 elle or 16 5V oc TFB5OI7AD 2SAIOISY 25 223 SP TRANS VR AMP OprYx2 TsPI042 25 1 815 sP 1079 BUFFER 25 1815 O DRIVE 2SCI815Y CONVERTER TRANS TPW3055A 115 PWM 2SAIOISY ERROR AMP EA m zc ze cd uc xp cg lI 10 PARTS LAYOUT MAIN BOARD PW5253 Figure 3 P101 RGB IN SW TERMINAL BOARD PW5252 3 Figure 4 VIDEO BOARD PW5252 1 Figure 6 3 R5 R Cut LO LO CRT DRIVE BOARD PW5252 2 Figure 5 P661 HEADPHONE BOARD PW5252 4 Figure 7 0820 LED PW5252 5 Figure 8 24 zd xp IX 2 1 WARNING BEFORE SERVICING THIS CHASSIS READ THE X RAY RADIATION PRECAUTION SAFETY PRECAUTION AND PRODUCT SAFETY NOTICE ON PAGE 2 OF THIS MANU
3. a SERVICE MODEL 1080 A MONITOR PN 314041 02 _ i MODEL 1080 A MONITOR PN 314041 02 NM _ Jj Commodore Amiga Inc 1200 Wilson Drive West Chester Pennsylvania 19380 U S A Commodore Amiga makes no expressed or implied warranties with regard to the information contain ed herein The information is made available sole ly on an as is basis and the entire risk as to quality and accuracy is with the user Commodore Amiga Inc shall not be liable for any consequential or in cidental damages in connection with the use of the information contained herein The listing of any available replacement part herein does not con stitute in any case a recommendation warranty or guaranty as to quality or suitability of such replace ment part Reproduction or use without express ed permission of editorial or pictorial content in any matter is prohibited 221 j _ I This manual contains copyrighted and proprietary information No part of this publication may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic mechanical photocopying recording or otherwise without the prior written permis sion of Commodore Amiga Inc Copyright 1986 by Commodore Amiga Inc d All rights reserved em ee 35 DU de SPECIFICATIONS X RAY RADIATION PRECAUTION SAFETY PRECAUTION PRODUCT SAFETY NOTICE
4. VIDEO BOARD PW5252 1 HEADPHONE JACK BOARD PW5252 4 LED BOARD PW5252 5 9922 Commodore Business Machines Inc 1200 Wilson Drive West Chester PA 19380 Commodore Business Machines Ltd 3470 Pharmacy Avenuc Agincourt Ontario MIW 3G3
5. Q104 Q105 Q106 NG Check Replace Q101 Lead Wire 108 109 OK Adjust RGB Sub Brightness R256 Check Replace Q118 D112 D124 D125 D126 D127 Check Replace Q121 Q119 Q120 I l j 45221 X m rl iy 221 uc 1 Ec J4 d 2252 Ed NO COLOR NTSC COMPOSITE Short between Pin 13 of Q501 and 12V line Normal color Abnormal Check the voltage at each Pin of Q501 Connect capacitor 0 047 uF between 41 TP42 Normal Abnormal No signal Check Color Sync Circuit Replace Q501 Check Replace Horiz Pulse Circuit No color Abnormal Normal Replace Q501 Check Replace Check Replace R239 C204 Check Replace Color Control C215 L 204 Color Sync Circuit Circuit Q122 Q123 Adjust Color Sync with C551 Replace Q501 SPECIFIC TINTED COLOR NTSC COMPOSITE Check the voltages at Pins 19 20 and 21 of Q501 Normal Abnormal Adjust C551 Detach the connection of Demod Output Leads Adjustment cannot be done Normal Check Replace Q121 and the parts in CRT DRIVE Circuit and adjustment of it Cut off and Drive Check Replace Q501 Adjustment of C551 Check Replace was not proper X501 C551 NO SOUND NORMAL PICTURE No Defective W661 Faulty sound output circu
6. TS 602082 10 PART NUMBER PART NUMBER 602081 13 602081 20 602081 04 602081 11 602081 09 602081 12 602082 00 602082 01 602081 14 602081 12 602082 06 602081 03 602080 92 602080 64 602082 14 602081 08 602081 03 602082 15 602081 20 602080 74 602081 64 602080 07 602080 18 602080 19 602080 09 602080 84 602081 10 602082 48 602081 24 602082 06 602081 67 602082 13 602082 12 602080 69 602081 09 602081 06 602081 15 602081 16 602081 99 602082 10 602081 66 602081 23 602082 01 602081 66 602081 74 602081 17 602081 74 602082 15 602081 14 602081 22 602081 03 602081 71 602081 07 602082 10 602081 26 602080 63 602081 07 602082 10 602081 03 602081 98 1 n 24366182 24366223 24366103 24366161 24366152 24366162 24366332 24366333 24366183 24366162 24366392 24366102 24360623 24360124 24366562 24366151 24366102 24366563 24366223 24360224 24552471 24060353 24066890 24066891 24060498 24360471 24366153 24941562 24366682 24366392 24552911 24366561 24366560 24360202 24366152 24366112 24366201 24366202 24366331 24366472 24552821 24366244 24366333 24552821 24554472 24366203 24554472 24366563 24366183 24366243 24366102 24366303 24366472 24553821 24366123 24366472 24366822 24360123 24366123 24366472 24366102 DESCRIPTION CF 1800 ohm 1 6W CF 22k ohm 1 6W CF 10k ohm 1 6W CF 160 ohm 1
7. 602080 06 602081 75 602082 03 602081 60 602082 02 602081 02 602082 55 602080 49 602081 31 602080 05 602082 02 602081 03 602082 10 602081 06 602082 07 602081 62 602080 55 602081 69 602082 50 COILS AND TRANSFORMERS 602083 40 602083 41 602083 37 602083 27 602083 28 602083 31 602083 32 SEMICONDUCTORS 602082 61 602082 61 602082 61 602082 70 602082 98 602082 67 602082 65 602082 71 602082 77 602082 61 602082 69 602082 79 602082 52 24942335 3 3 ohm 1 2W 24554563 24366362 24552100 24366361 24366100 24982159 24327154 24378334 24007842 24366361 24366102 24366472 24366302 24366112 24366393 24552202 24327561 24553473 24942182 23283300 23283820 23237977 23221026 23221061 23222694 23224988 A6317440 A6317440 A6317440 A6509140 23114544 A6325010 A6319550 A6532320 A6734590 A6317440 A6330000 A6868700 24007942 DESCRIPTION Cement 180 ohm 5W OMF 56k ohm 2W CF 3600 ohm 1 6W OMF 10 ohm 1 2W CF 360 ohm 1 6W CF 10 ohm 1 6W MF 1 5 ohm 1 2W 150k ohm 1 1 4W CF 330k ohm 296 1 8W Cement 12 ohm 5W CF 360 ohm 1 6W CF 1000 ohm 1 6W CF 4700 ohm 1 6W 3000 ohm 1 6W CF 1100 ohm 1 6W CF 39k ohm 1 6W OMF 2000 ohm 1 2 560 ohm 196 1 4W OMF 47k ohm 1W CC 1800 ohm 1 2W Coil TRF4300JG Peaking Coil TRF4820JG Peaking Coil TRF46
8. H drive normal amp Yes Check H osc and H drive Qu cJ zc 1 J j a m 2 4 d HORIZONTAL SYNC Is picture stabilized by rotating R451 Is sync pulse 10Vp p presented at 437 of Q501 Check Sync Circuit and Q501 NO VERTICAL SWEEP No Is power 42V applied Is sawtooth waveform presented at 30 of 0501 Is sawtooth wave form presented at 28 of Q501 Y es Check Vert out circuit de c Check Hold circuit and Q501 Check AFC circuit and Q501 No Check V HOLD circuit and Q501 No Check Height circuit and Q501 NO RASTER SOUND OK NTSC COMPOSITE Heater Elements of CRT are lit Yes Check H V at 2nd Anode of CRT OK No Check the DC voltages Check Replace Horiz at 16 5V line Output Trans T461 Check Replace Check the DC voltage D403 D409 at the pin 19 20 21 of R428 R438 Q501 TYP 7V No OK Check Replace Q505 Q506 Q507 Check Replace Q508 0509 0510 Q501 Q511 0512 0513 0514 0515 0516 Check pulse at 9 of T461 No Check Replace Horiz Output Trans 461 OK Check Replace Wiring and Fusible Resistor R920 Still no raster Replace CRT V901 heater open D 2 F j d d sd x A
9. 08 602080 08 602082 10 602081 04 602081 18 602081 96 602080 14 602080 13 602080 02 602080 52 602082 03 602082 04 602081 30 24366434 24060427 24366472 24366103 24366204 24366273 24063990 24061768 24003989 24327273 24366362 24366363 24378154 DESCRIPTION CF 430k ohm 1 6W VR 10k ohm 2W CF 4700 ohm 1 6W CF 10k ohm 1 6W CF 200k ohm 1 6W CF 27k ohm 1 6W VR 200k ohm 0 15W VR 100k ohm 0 3W MF 3900 ohm 2 1 4W MF 27k ohm 196 1 4W CF 3600 ohm 1 6W CF 36k ohm 1 6W za x 602081 33 24383122 OMF 1200 ohm _ 602080 03 _MF ohm t 296 1 4w _ 602081 05 24366104 CF 150k ohm iia 2 602081 57 24532332 CF 100k ohm 10ko hm 1 6W CF 33k ohm 1 6W 24982109 MF 1ohm 1 28 1500 ohm 296 6800 ohm 2W CF 120 ohm 2 1 6W OMF 560 ohm 1 2W 24327303 MF out ohm 21 24327562 MF 5600 ohm 196 1 4W MF 6800 ohm diu 1 4W 24321339 OMF 3 3 1 20 R416 602081 04 24366103 R417 602082 01 24366333 18 602082 54 R419 602081 29 24367152 R420 602081 34 24383682 R421 602081 28 24367121 R422 602081 65 24552561 R423 602080 53 R425 602080 56 R426 602080 57 RAO 2082 5 R429 _ 602081 35 24383750 Cx R431 602081 70 24553561 R432 602082 06 24366392 R451 602080 17 24066889 R452 602080 16 24063996 R501 602081
10. 1 8W CF 68 ohm 1 8W OMF 3300 ohm 3W CF 68 ohm 1 8W 3300 ohm 3W CF 68 ohm 1 8W 3300 ohm 3W CC 680 ohm 1 2W Coil TRF4220AC Peaking Transistor 2SC388ATM Transistor 2SC 2068 Transistor 2SC388ATM Transistor 2SC 2068 Transistor 28C388ATM Transistor 2SC 2068 Transistor 2SC2229 Y Transistor 2SA949 Y Transistor 28C2229 Y Transistor 254949 Transistor 28C2229 Y Transistor 2SA949 Y LOCATION COMMODORE VENDOR NUMBER PART NUMBER PART NUMBER MISCELLANEOUS BAS U901 U901 Wu MICE LLAN EQUS DESCRIPTION TERMINAL BOARD 23331518 24633100 24633101 24636478 24436301 24212102 24636010 24633100 24360222 24360820 24360563 24360153 24360223 24360562 24552101 24360562 24360331 24360471 24360303 24360331 24360303 24360332 23103929 B0470532 A6317440 23901787 23166235 23166233 23166234 23145453 _ Terminal Board Assembly PW5252 3 EL 10uF 16V EL 100uF 16V EL 0 47uF 50V CD 300pF CD 1000pF EL 1uF 50V EL 10uF 16V CF 2200 ohm 1 8W CF 82 ohm 1 8W CF 56k ohm 1 8W CF 15k ohm 1 8W CF 22k ohm 1 8W CF 5600 ohm 1 8W OMF 100 ohm 1 2W CF 5600 ohm 1 8W CF 330 ohm 1 8W CF 470 ohm 1 8W CF 30k ohm 1 8W CF 330 ohm 1 8W CF 30k ohm 1 8W CF 3300 ohm 1 8W Ferrite Choke IC TC4053BP Transistor 28C1815 Y Plug 9P Phono Jack Red Phono Jack Yellow Phono Jack White Slide
11. 25 24366683 R502 602081 27 24366913 R503 602082 13 24366561 R504 602081 07 24366123 R506 602081 49 24941565 R507 602081 03 24366102 R508 602081 09 24366152 R509 602082 11 24366473 R510 602081 21 24366224 R514 602082 06 24366392 R517 602081 10 24366153 R518 602081 03 24366102 R525 602082 17 24366681 R526 602082 09 24366471 R541 R542 602081 19 24366222 R543 R544 R545 602082 05 24366391 R546 R551 602080 09 24060498 R553 ii 602080 10 24061656 R651 602080 15 24063994 75 ohm 2W 2 802080 45 24321829 8 2 ohm 1 2W CF 3900 ohm 1 6W VR 10k ohm 0 3W VR 2k ohm 0 15W CF 68k ohm 1 6W CF 91k ohm 1 6W CF 560 ohm 1 6W CF 12k ohm 1 6W CC 5 6M ohm 1 4W CF 1000 ohm 1 6W CF 1500 ohm 1 6W CF 47k ohm 1 6W CF 220k ohm 1 6W CF 3900 ohm 1 6W CF 15k ohm 1 6W CF 1000 ohm 1 6W CF 680 ohm 1 6W CF 470 ohm 1 6W CF 2200 ohm 1 6W CF 390 ohm 1 6W VR 10k ohm 0 15W Center Click VR 10k ohm 0 125W VR 10k ohm 0 15W m 2 b i R805 R807 R808 R809 R810 R811 R812 R816 R817 R823 R824 R826 R827 R828 R830 R831 L202 L203 L204 L801 L802 Q201 Q202 Q203 Q204 Q205 Q206 Q207 Q208 Q301 Q302 Q303 Q304 Q305 Q306 Q307 Q403 0404 0406 0501 0802 0803 NUMBER 602081 97 LOCATION COMMODORE VENDOR PART NUMBER PART NUMBER
12. 602081 95 C125 602081 88 C126 602081 95 C127 602081 86 C128 602081 84 C129 602081 86 C130 602082 21 131 602081 88 C132 602081 95 133 602081 89 C134 602080 43 C135 602083 89 136 602081 41 C142 602081 90 C603 602081 86 C604 602080 37 C605 602081 87 C606 602082 36 C607 602081 95 C608 602082 29 C609 602080 21 C610 602080 33 RESISTORS R114 602081 00 R115 602083 81 R116 602080 68 R117 R118 8119 602080 78 R120 R121 R122 2123 602080 84 R124 R125 2126 602081 00 R127 602080 96 R128 602080 59 R129 R130 R131 602080 69 R132 R133 602080 78 R134 602080 71 R135 602080 59 R136 602080 75 R137 602080 69 R138 602080 59 R139 602080 71 R140 602080 75 R141 R142 602080 91 R143 24436240 24436120 24636478 24232103 24635479 24232103 24635479 24636478 24633100 24636479 24636010 24232103 24636010 24633220 24636010 24633100 24632221 24633100 24636229 24633220 24636010 24633221 24232103 24436201 24436151 24633470 24633100 24212682 24633101 24693123 24636010 24642220 24085040 24212102 24360910 24360911 24360201 24360331 24360471 24360910 24360751 24360102 24360202 24360331 24360221 24360102 24360271 24360202 24360102 24360221 24360271 24360621 DESCRIPTION CD 24pF 0 25pF CD 12pF EL 0 47uF 50V CD 0 01uF 80 20 EL 4 7uF 35V 0 01uF 8096 20 EL 4 70 35 EL 0 47uF 50V EL 10uF 16V
13. CONTRAST and BRIGHTNESS controls to click position NTSC Composite 1 Set the switch S201 to COMP 2 Set the COLOR control to minimum 3 Adjust the COMPO SUB BRIGHTNESS R255 so that the raster is slightly visible RGB 1 Set the switch S201 to RGB and S101 to Analog RGB 2 Adjust the RGB SUB BRIGHTNESS R256 so that the raster is slightly visible 3 Connect the monitor to an H character signal 2000 cha 4 Mount a brightness meter to the center of display area 5 Adjust the SUB CONTRAST control R252 to obtain 38 ft L 6 Set the switch S101 to Digital RGBI 7 Connect the monitor to an H character signal 2000 cha 8 Mount a brightness meter to the center of display area 9 Adjust the SUB CONTRAST control R250 to obtain 38 ft L CONVERGENCE MAGNET ASSEMBLY POSITIONING Convergence magnet assembly and rubber wedges need mechanical positioning Refer to figure 9 COLOR PURITY ADJUSTMENT Allow the system to receive a white pattern signal Turn the CONTRAST and BRIGHTNESS controls to the maximum Preheat more than 30 minutes Using the degausser coil degauss the picture tube Loosen the clamp screw of the yoke and slide the yoke backward Remove the Rubber Wedges Slide yoke toward the picture tube Receive green raster pattern signal Rotate and spread the tabs of the purity magnet See Figure 11 around the neck of the picture tube until impuri
14. EL 4 7uF 50V EL 1uF 50V CD 0 01uF 8096 20 EL 1uF 50V 22uF 16V EL 1uF 50V EL 10uF 16V EL 220uF 10V EL 10uF 16V EL 2 2uF 50V EL 22uF 16V EL 1uF 50V EL 220uF 16V CD 0 01 80 20 CD 200pF CD 150pF EL 47uF 16V EL 10uF 16V CD 6800pF 10 EL 100uF 16V 0 012 100V EL 1uF 50V EL 22uF 160V EL 2 2uF 250V CD 1000pF 10 CF 91 ohm 1 8W CF 910 ohm 1 8W CF 200 ohm 1 8W CF 330 ohm 1 8W CF 470 ohm 1 8W 91 ohm 1 8W CF 750 ohm 1 8W CF 1000 ohm 1 8W CF 2000 ohm 1 8W CF 330 ohm 1 8W CF 220 ohm 1 8W CF 1000 ohm 1 8W CF 270 ohm 1 8W CF 2000 ohm 1 8W CF 1000 ohm 1 8W CF 220 ohm 1 8W CF 270 ohm 1 8W CF 620 ohm 1 8W LOCATION NUMBER R145 R146 R144 R147 R148 R149 R150 R151 R152 R153 R154 R155 R156 R157 R158 R159 R160 R161 R162 R163 R164 R165 R167 R168 R169 R170 R171 R172 R173 R176 R177 R178 R179 R180 R183 R184 R185 R186 R187 R188 R190 R191 R192 R193 R194 R195 R196 R197 R198 R199 R200 R201 R202 R203 R204 R212 R213 R214 R215 R217 R250 R252 R253 R271 R606 R607 R608 R609 25 V WF R251 COMMODORE PART NUMBER PART NUMBER 602080 94 602080 85 602080 75 602081 61 602080 78 602080 89 602080 73 602081 72 602080 66 602080 69 602080 71 602080 84 602081 64 602080 99 602080 72 6
15. R562 R563 R565 R566 R567 R590 R591 R592 R593 R594 R595 R596 R901 L592 L593 602080 59 602080 88 602080 70 602080 12 602080 11 602080 12 602080 11 602080 87 602080 62 602080 83 602080 93 602081 36 602080 93 602081 36 602080 93 602081 36 602082 53 602083 38 SEMICONDUCTORS 0505 0506 0507 0508 0509 0510 0511 0512 0513 0514 0515 0516 602082 76 602082 64 602082 76 602082 64 602082 76 602082 64 602082 66 602082 72 602082 66 602082 72 602082 66 602082 72 23331518 24214103 24633101 24212471 24692104 24212471 24436431 24212471 24692104 24436431 24692104 24436431 24095989 24642479 24360102 24360561 24360220 24061673 24061668 24061673 24061668 24360560 24360105 24360430 24360680 24384332 24360680 24384332 24360680 24384332 24942681 23237983 A6708870 A6319400 A6708870 A6319400 A6708870 A6319400 A6324940 A6532840 A6324940 A6532840 A6324940 A6532840 CRT Drive Board Assembly PW5252 2 CD 0 01uF 10 500V EL 100uF 16V CD 470pF 1096 PF O 1uF 470 1096 CD 430pF 10 CD 470pF 1096 PF O 1uF 430pF 1096 PF O 1uF CD 430pF 1096 PF 1000pF 1 6kV EL 4 7uF 160V CF 1000 ohm 1 8W CF 560 ohm 1 8W CF 22 ohm 1 8W VR 200 ohm 0 125W VR 10k ohm 0 125W VR 200 ohm 0 125W VR 10k ohm 0 125W CF 56 ohm 1 8W CF 1M ohm 1 8W 43 ohm
16. RADIATION To avoid such hazards the high voltage must not be above the specified limit The nominal value of the high voltage of this color monitor is 26 5 kV at zero beam current minimum brightness under a 120V AC power source The high voltage must not under any circumstances exceed 27 5 kV Each time a color monitor requires servicing the high voltage should be checked following the HIGH VOLT AGE CHECK procedure on page 13 of this manual It is recommended that the reading of the high voltage be recorded as part of the service record It is important to use an accurate and reliable high voltage meter 2 This color monitor is equipped with a Fail Safe FS circuit which prevents the color monitor from produc ing an excessively high voltage even if the B voltage increases abnormally Each time the color monitor is serviced the FS circuit must be checked to determine that the circuit is properly functioning following the FS CIRCUIT CHECK procedure on page 13 of this manual The only source of X RAY RADIATION in this color monitor is the picture tube For continued X RAY RADIATION protection the replacement tube must be exactly the same type tube as specified in the parts list Some parts in this color monitor have special safety related characteristics for X RAY RADIATION protec tion For continued safety parts replacement should be undertaken only after referring to the PRODUCT SAFETY NOTICE below 3 SAFETY PRE
17. SERVICE NOTES LOCATION FOR USER CONTROLS CHASSIS VIEW MECHANICAL DISASSEMBLY BLOCK DIAGRAM PARTS LAYOUT INSTALLATION AND SERVICE ADJUSTMENTS HIGH VOLTAGE CHECK FS CIRCUIT CHECK TROUBLESHOOTING CHARTS CHASSIS REPLACEMENT PARTS LIST PRINTED CIRCUIT BOARD VIEW SCHEMATIC DIAGRAM Casto Do Um S TABLE OF CONTENTS 1 SPECIFICATIONS CRT Power Input Power Consumption Input Signals Input Levels Audio Input Audio Output Video Bandwidth Scanning Frequency Display Format Display Size Resolution Dimensions Weight 13 90 0 39 mm Dot Nonglare grey AC 120V 60 Hz 70W Typ NTSC Comp Sep video Digital RGBI Analog RGB Comp 1Vp p 75 ohms Termination Digital RGBI TTL levels Analog RGB 0 7 1 0Vp p 1 0W NTSC 4 2 MHz Digital 15 32 MHz Analog RGB 10MHz Horizontal 15 75 KHz Vertical 60Hz mode 2000 Characters 80 col x 25 lines 6 x 7 dot array Video mode 1000 Characters 40 col x 25 lines 6 x 7 dot array mode Horizontal 250mm Vertical 182mm mode 2000 Characters Horizontal 640 dots Vertical 400 lines interlaced Video mode 1000 Characters Horizontal 320 dots Vertical 400 lines interlaced 360 W x 327 5 H x 376 D mm 11 5 kg 121 JJ J 1x 2 X RAY RADIATION PRECAUTION 1 Excessive high voltage can produce potentially hazard ous X RAY
18. 00 ohm resistor and 0 15 mfd capacitor Reverse the AC plug at the AC plug at the AC outlet and repeat AC voltage mea surements for each exposed metallic part Voltage measured must not exceed 1 5 volts RMS This corre sponds to 1 0 milliamp AC Any value exceeding this limit constitutes a potential shock hazard and must be corrected immediately AC VOLTMETER Place this probe on each exposed metallic part Good earth ground such as a water pipe conduit etc 1500 ohm 10 watts J Lip Il d Iy 4 PRODUCT SAFETY NOTICE Many electrical and mechanical parts in this chassis have special safety related characteristics These characteristics are often passed unnoticed by a visual inspection and the protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage wattage etc Replacement parts which have these special safety characteristics are identified in this manual and its supplements electrical components having such features are identified by shading on the schematic diagram and the parts list Before replacing any of these components read the parts list in this manual carefully The use of substitute replacement parts which do not have the same safety characteristics as specified in the parts list may create shock fire X ray radia tion or other hazards 5 SERVICE NOTES 1 When replacing parts or circuit boards clamp the lead wires to ter
19. 02080 99 602080 72 602080 58 602080 59 602080 94 602080 59 602080 85 602080 79 602080 94 602080 98 602080 87 602080 66 602080 86 602080 60 602080 81 602080 72 602080 79 602080 60 602080 96 602080 85 602080 72 602080 79 602080 61 602080 72 602081 64 602083 90 602080 59 602083 91 602080 19 602080 11 602080 63 602080 92 602080 59 602080 89 602080 85 VENDOR 24360681 24360472 24360271 24552101 24360331 24360562 24360223 24554151 24360152 24360202 24360221 24360471 24552471 24360822 24360222 24360822 24360222 24360101 24360102 24360681 24360102 24360472 24360331 24360681 24360821 24360560 24360152 24360512 24360103 24360362 24360222 24360332 24360103 24360751 24360472 24360222 24360332 24360104 24360222 24552471 24552361 24360102 24552112 24066891 24061668 24360123 24360623 24360102 24360562 24360472 DESCRIPTION CF 680 ohm 1 8W CF 4700 ohm 1 8W CF 270 ohm 1 8W OMF 100 ohm 1 2W CF 330 ohm 1 8W CF 5600 ohm 1 8W CF 22k ohm 1 8W OMF 150 ohm 2W CF 1500 ohm 1 8W CF 2000 ohm 1 8W CF 220 ohm 1 8W 470 ohm 1 8W OMF 470 ohm 1 2W CF 8200 ohm 1 8W CF 2200 ohm 1 8W CF 8200 ohm 1 8W CF 2200 ohm 1 8W CF 100 ohm 1 8W CF 1000 ohm 1 8W CF 680 ohm 1 8W CF 1000 ohm 1 8W CF 4700 ohm 1 8W CF 330 ohm 1 8W CF 680 ohm 1 8W CF 820 ohm 1 8W CF 56 ohm 1
20. 4360683 24360151 24360222 24360102 24532471 24552330 23237975 A6734590 A6317440 23119784 B0470532 A6734590 A6317440 A6534040 A6848520 A6534040 23119723 A6317440 A6534040 A6317440 A6325120 A7246711 A7110018 A7110311 A7246711 A7110410 A7240711 CF 100k ohm 1 8W CF 680k ohm 1 8W OMF 1100 ohm 1 2W OMF 36k ohm 1W CF 390k ohm 1 8W CF 68k ohm 1 8W CF 150 ohm 1 8W CF 2200 ohm 1 8W CF 1000 ohm 1 8W FR 470 ohm 1W OMF 33 ohm 1 2W Coil TRF4101AC Transistor 28C752GTM Y Transistor 28C1815 Y IC HD7407P IC TC4053BP Transistor 28C752GTM Y Transistor 28C1815 Y Transistor 28A1015 Y Transistor 28D880 Y Transistor 28A1015 Y IC AN5352 Transistor 28C1815 Y Transistor 28A1015 Y Transistor 25A1815 Y _ Transistor 28C2231 O Diode 181555 Zener Diode 0525 62 Zener Diode 05210 Diode 181555 Zener Diode 05212 Diode 181555 LOCATION COMMODORE VENDOR NUMBER D601 U901 PART NUMBER PART NUMBER DESCRIPTION 602082 86 47246602 Diode 181553 CRT DRIVE BOARD 602083 44 CAPACITORS C589 C590 C591 C592 C593 C594 C595 C596 C597 C598 C599 C902 C903 602080 38 602081 87 602080 36 602082 33 602080 36 602083 92 602080 36 602082 33 602083 92 602082 33 602083 92 602080 31 602082 31 RESISTORS R531 R532 R533 R534 R535 R536 R537 R538 R539 R555 R556 R557 R558 R559 R561
21. 470 24538474 24630991 24232103 24692303 24636479 24212102 24636010 24598142 24215181 24640972 24622101 24094819 24366223 24366202 24366103 24366123 24366472 24366123 EL 47uF 25V EL 33uF 160V EL 470uF 25V EL 22uF 25V PF 1500pF EL 1000uF 16V EL 0 47uF 50V CD 0 01uF 80 CD 1000pF 10 CD 33pF CD 10pF 0 25pF EL 0 47uF CD 0 01uF 80 20 0 039uF CD 82pF CD 910pF CD 12pF CD 330pF Variable Capacitor 2 5 23pF a 4 ASTRA y wy IK 1 SK pale M EL 470uF 200V PF 3300pF 1 6kV EL 47uF 50V 0 47uF EL 47uF 25V CD 0 01uF 80 20 PF 0 03uF EL 4 7uF 50V CD 1000pF 10 EL 1uF 50V 2400pF CD 180pF 10 1kV EL 33uF 160V EL 100uF 160V CD 4700pF 20 AC125V CD 22k ohm 1 6W CF 2000 ohm 1 6W CF 10k ohm 1 6W CF 12k ohm 1 6W CF 4700 ohm 1 6W CF 12k ohm 1 6W LOCATION COMMODORE VENDOR NUMBER R227 R228 R229 R230 R231 R232 R233 R234 R235 R236 R237 R238 R239 R240 R241 R242 R243 R244 R245 R246 R247 R248 R249 R254 R255 R256 R259 R260 R261 R262 R263 R264 R265 R266 R267 R269 R270 R301 R302 R303 R304 R305 R306 R307 R308 R309 R310 R311 R312 R313 R314 R315 R316 R317 R319 1320 2 321 R322 R323 R324 R325 R326 R327 R328 R329 R330
22. 5 602081 42 602081 95 602082 32 602081 86 602082 39 602081 39 602083 78 602081 95 602082 42 602081 43 602082 35 602081 93 602081 37 602080 34 602081 81 602082 43 602082 27 602080 41 602081 77 602082 19 602082 24 602081 81 602082 41 602080 39 602080 43 602082 22 602081 52 602082 46 602082 24 602082 45 602081 82 602081 80 602082 29 602082 25 602081 94 602081 85 602082 44 602081 79 602080 40 602081 41 602080 34 602082 37 e 7 A 4 I A i b lt w r Zw Ws 5 gt 7 i ban she eh eS be ES at ew 23331519 24633100 24436910 24232103 24436300 24436680 24633220 24636479 24436220 24636010 24692103 24633100 24794221 24436120 24795101 24636010 24797331 24436271 24692563 24635100 24435181 24212152 24617981 24828153 24640989 24214392 24577228 24636100 24635478 24617981 24797221 24214331 24232103 24636339 24436680 24867682 24636478 24867562 24617992 24598242 24642220 24636479 24635479 24632470 24828223 24598122 24214391 24436151 24212152 24792222 Main Board Assembly PW5253 EL 10uF 16V CD 91pF CD 0 014F 80 2096 CD 30pF CD 68pF EL 22uF 16V EL 4 7uF 50V CD 22pF EL 1uF 50V PF 0 01uF EL 10uF 16V EL 220uF 16V CD 12pF EL 100uF 25V EL 1uF 50V EL 330uF 50V CD 2
23. 6W CF 1500 ohm 1 6W CF 1600 ohm 1 6W CF 3300 ohm 1 6W CF 33k ohm 1 6W CF 18k ohm 1 6W CF 1600 ohm 1 6W CF 3900 ohm 1 6W CF 1000 ohm 1 6W CF 62k ohm 1 8W CF 120k ohm 1 8W CF 5600 ohm 1 6W CF 150 ohm 1 6W CF 1000 ohm 1 6W CF 56k ohm 1 6W CF 22k ohm 1 6W CF 220k ohm 1 8W OMF 470 ohm 1 2W VR 500 ohm 0 15W Center Click VR 5000 ohm 0 3W VR 2000 ohm 0 3W VR 10k ohm 0 15W Center Click CF 470 ohm 1 8W CF 15k ohm 1 6W CC 5600 ohm 1 4W CF 6800 ohm 1 6W CF 3900 ohm 1 6W OMF 910 ohm 1 2W CF 560 ohm 1 6W CF 56 ohm 1 6W CF 2000 ohm 1 8W CF 1500 ohm 1 6W CF 1100 ohm 1 6W CF 200 ohm 1 6W CF 2000 ohm 1 6W CF 330 ohm 1 6W CF 4700 ohm 1 6W 820 ohm 1 2W CF 240k ohm 1 6W CF 33k ohm 1 6W OMF 820 ohm 1 2W OMF 4700 ohm 2W CF 20k ohm 1 6W OMF 4700 ohm 2W CF 56k ohm 1 6W CF 18k ohm 1 6W CF 24k ohm 1 6W CF 1000 ohm 1 6W CF 30k ohm 1 6W R41 5 ZIN 42 NEC E 602081 73 prre OMF 1600 ohm 2W 7 24882439 4 3 ohm 1 2W CF 4700ohm 1 6W OMF 820 ohm 1W CF 12k ohm 1 6W CF 4700 ohm 1 6W CF 8200 ohm 1 6W CF 12k ohm 1 8W CF 12k ohm 1 6W CF 4700 ohm 1 6W CF 1000 ohm 1 6W LOCATION COMMODORE VENDOR NUMBER R331 R332 R333 R334 R336 R341 R342 R351 R352 R401 R402 R403 R404 R405 R406 8408 R409 0 NF 007 PART NUMBER PART NUMBER 602082
24. 70pF PF 0 056 EL 10uF 35V CD 180pF 500V CD 1500pF 10 EL 2 2uF 1096 50V PF 0 015uF 200V EL 4 7uF 160V CD 3900pF 1096 500V EL Tantalum 0 22uF 1096 35V EL 10uF 50V EL 0 47uF 50V EL 2 2uF 1096 50V EL 220uF 50V CD 330pF 10 500V CD 0 01uF 80 20 EL 3 3uF 50V CD 68pF PF 6800pF EL 0 47uF 50V 5600pF EL 2 2uF 2096 50V PF 2400pF EL 22uF 160V EL 4 7uF 50V EL 4 7uF 35V EL 47uF 10V PF 0 022uF 200V PF 1200pF CD 390pF 10 500V CD 150pF CD 1500pF 10 EL 2200uF 6 3V C809 C810 C811 C812 C813 C814 C815 C816 C817 C818 C819 C820 C821 C822 C823 C824 602081 92 602082 30 602082 40 602081 91 602081 78 602082 38 602082 24 602080 43 602080 33 602081 45 602081 38 602082 24 602080 43 602082 47 60208 1 54 602081 56 602081 39 602081 46 602080 23 2 602080 22 602080 30 602082 23 602081 59 602081 83 602080 43 602082 34 602082 25 602080 33 602081 95 602081 80 602080 42 602082 26 602082 28 602080 24 RESISTORS R220 R221 R222 R223 R224 R225 R226 602081 20 602081 16 602081 04 602081 07 602082 10 60208 1 07 24634470 24642330 24795471 24634220 24591152 24794102 24636478 24232103 24212102 24436330 24436100 24636478 24232103 24868393 24436820 24436911 24436120 24436331 24094541 24086961 24095977 24636
25. 80AC Coil AZ9004Y Choke Coil TLN1015F Choke Coil TLN2026 Transistor 28C1815 Y Transistor 25 1815 Transistor 2SC1815 Y Transistor 25 562 Transistor 2SA1206 Transistor 28C2230 Y Transistor 25 2073 Transistor 254940 Transistor 2SC752GTM Y Transistor 25 1815 Transistor 28C2482 F A 1 Transistor 2SD1427 FA 1 602082 77 A6734590 Transistor 25C752GTM Y 602082 95 B0356451 602082 63 A6319300 Transistor 28C1959 Y 602082 75 A6534125 Transistor 2SA1020 Y IC TA7644CP Transformer TLN1032 H Drive zx yd icm NUMBER D214 D301 D302 D303 D305 D308 D310 D401 D402 D805 D806 D807 D808 D809 D810 D811 D812 D813 D814 D815 D816 D817 D818 602082 74 A6534040 Transistor 2541015 602082 87 602082 86 602082 87 602082 86 602082 89 602083 00 602082 87 602082 82 602082 87 602082 87 602082 93 602082 87 602082 93 602082 88 602082 93 602082 87 602082 84 602082 87 602082 94 602082 92 602082 94 602082 86 602083 74 602082 81 602082 99 602082 87 602082 86 602082 91 MISCELLANEOUS X201 X501 S201 S202 U901 602083 39 602083 13 602083 08 602083 11 602083 43 CAPACITORS C104 C105 C106 C107 C108 C109 602081 90 602081 40 602081 86 602082 24 7246711 LOCATION COMMODORE VENDOR PART N
26. 8W CF 1500 ohm 1 8W CF 5100 ohm 1 8W CF 10k ohm 1 8W CF 3600 ohm 1 8W CF 2200 ohm 1 8W CF 3300 ohm 1 8W CF 10k ohm 1 8W CF 750 ohm 1 8W CF 4700 ohm 1 8W 2200 1 8W 3300 ohm 1 8W 100k ohm 1 8W 2200 ohm 1 8W 470 ohm 1 2W 3600 ohm 1 2W 1000 ohm 1 8W 1100 ohm 1 2W VR 2000 ohm 0 3W VR 10k ohm 0 125W CF 12k ohm 1 8W CF 62k ohm 1 8W CF 1000 ohm 1 8W CF 5600 ohm 1 8W CF 4700 ohm 1 8W ze 2 zo Ege x LOCATION COMMODORE VENDOR NUMBER PART NUMBER PART NUMBER DESCRIPTION R610 602080 61 R611 602080 94 R612 602081 32 R613 602081 68 R614 602080 82 R615 602080 95 R616 602080 65 R617 602080 72 R618 602080 59 R619 602081 58 R620 602081 63 COIL 1104 602083 36 SEMICONDUCTORS 0102 602082 77 0104 0105 902082 61 Q107 0108 602083 04 0109 602082 96 0110 0111 602082 77 0112 0113 602082 61 0114 0115 602082 74 Q116 0117 aide 602082 78 Q119 52 602082 74 0121 602083 03 0122 Q123 t 602082 61 0124 0125 602082 74 0126 0602 602082 61 Q603 Q604 602082 68 D101 D102 D103 D104 0105 602082 87 D106 D107 D108 D109 D110 D111 602082 81 0112 602083 77 D114 S5 602082 87 D119 D120 602082 83 0121 0122 0124 0125 0126 0127 602082 87 0128 0510 0511 0512 24360104 24360681 24381112 24553363 24360394 2
27. AL 11 INSTALLATION AND SERVICE ADJUSTMENTS HORIZONTAL HOLD ADJUSTMENT 1 Connect the color monitor to a white pattern signal 2 Set the brightness control to maximum 3 Using a short jumper connect terminal of the main board to terminal 4 Turn the H HOLD control R451 and set it where the white pattern picture stops i e there is no hori zontal bar b Remove the short jumper VERTICAL HOLD ADJUSTMENT 1 Connect the color monitor to a white pattern signal 2 Set the brightness control to click point 3 Turn V HOLD control R351 and set it to the center of vertical hold range HORIZONTAL POSITION ADJUSTMENT NOTE This adjustment must always be preceded by horizontal hold adjustment 1 Connect the color monitor to a white pattern signal 2 Set the brightness control to click point 3 Turn the H POSITION control R452 to ensure that an equal space can be obtained on the right and left sides of the screen VERTICAL POSITION ADJUSTMENT NOTE This adjustment must always be preceded by vertical hold adjustment 1 Connect the color monitor to a white pattern signal 2 Set the brightness control to click point 3 Turn the V POSITION control R353 to ensure that an equal space can be obtained at the top and bottom of the screen ox go HORIZONTAL AMPLITUDE ADJUSTMENT NOTE This adjustment must always be preceded by horizontal hold adjustment horizontal position a
28. CAUTION WARNING Service should not be attempted by anyone unfamiliar with the necessary precautions on this color monitor The following are the necessary precautions to be observed before servicing this chassis 1 Always discharge the picture tube anode to the CRT conductive coating before handling the picture tube The picture tube is highly evacuated and if broken glass fragments will be violently expelled Use shatter proof goggles and keep picture tube away from the un protected body while handling 2 When replacing a chassis in the cabinet always be cer tain that all the protective devices are put back in place such as non metallic control knobs insulating covers shields isolation resistor capacitor network etc 3 Before returning the set to the customer always perform an AC leakage current check on the exposed metallic parts of the cabinet such as terminals screwheads metal overlays control shafts etc to be sure the set is safe to operate without danger of electrical shock Plug the AC line cord directly into a 120V AC outlet do not use a line isolation transformer during this check Use an AC voltmeter having 5000 ohms per volt or more sensitivity in the following manner Connect a 1500 ohm 10 watt resistor paralleled by a 0 15 mfd AC type capacitor between a known good earth ground water pipe conduit etc and the ex posed metallic parts one at a time Measure the AC voltage across the combination of 15
29. Switch 6C3P HEADPHONE JACK BOARD 602083 46 23331518 Headphone Jack Board 602083 45 CAPACITORS C101 602081 86 102 602081 87 C103 602082 24 C138 C139 602083 80 C140 C141 602080 33 _ C601 602081 95 C602 602081 86 RESISTORS R101 102 602080 72 R103 E104 602080 97 105 E 6 602080 90 R107 i 602080 67 R109 TIO 602080 73 R111 602080 89 8112 602081 61 R113 602080 89 R205 R206 602080 78 R207 R208 205 602080 84 R601 602080 77 R602 602080 78 R604 602080 77 R605 602080 79 COILS L105 L106 L107 602083 79 L108 L109 SEMICONDUCTORS Q101 602082 96 Q601 602082 61 MISCELLANEOUS P101 602083 64 P102 602083 19 P103 602083 17 P601 602083 18 S101 602083 09 U901 SEMICONDUCTOR D820 Assembly PW5252 4 LED BOARD 602083 47 23331518 LED Board Assembly PW5252 5 602083 02 23118477 LED W661 LOCATION COMMODORE VENDOR NUMBER PART NUMBER PART NUMBER DESCRIPTION CRT BLOCK V901M 602082 97 23102989 E901 602083 94 23198812 E912 602083 60 23848937 Purity Magnet MAG1006 CRT Earth Lead Rubber Wedge OTHERS 602083 12 23151534 Speaker SPK1079 cp LL 16 PRINTED CIRCUIT BOARD VIEW ke MAIN BOARD PW5253 po 2722 27 J J L GOI i ec fed ee y or E wWV i ry H d paypi LU Y ii U U U Lh
30. UMBER PART NUMBER A7246602 A7246711 A6246602 A7568475 23115888 A7246711 A7110116 A7246711 A7568475 7978850 A7246711 A7978850 7568460 7978850 7246711 7110411 7246711 7978855 7800720 7978850 7246602 7568300 7110018 23115774 7246711 7246602 7580660 23250990 23153961 23145452 23145682 Diode 151555 Diode 151553 Zener Diode 0576 82 1 DESCRIPTION Diode 1S1555 Diode 1S1553 Diode TVR 2D Diode RU 1A Diode 1S1555 Diode 1S1555 Diode TVR 2D Diode S5295G Diode 1S1555 Diode S5295G Diode TVR 1B Diode 552950 Diode 181555 Zener Diode 05212 Diode 181555 Diode S5295J Thyristor SFOR1B41 Diode S5295G Diode 181553 Diode 181835 Zener Diode 0525 62 Zener Diode RD6 2bE FA 1 Diode 151555 Diode 181553 Diode 3JH61 Coil TRF2015 Crystal Slide Switch 2C3P Switch Lever 1C3P VIDEO BOARD 23331518 24633470 24436121 24633100 24636478 Video Board Assembly PW5252 1 EL 47uF 16V CD 120pF EL 10uF 16V EL 0 47uF 50V LOCATION COMMODORE VENDOR PART NUMBER PART NUMBER NUMBER C110 2 602083 88 C112 602081 39 C113 602082 24 C114 602080 43 C115 602081 94 C116 602080 43 117 602081 94 C118 602082 24 C119 602081 86 C120 602082 25 C121 602081 95 C122 602080 43 123
31. appears 10 Adjust the first and second color CUTOFF controls so that the horizontal color bar will be white 11 If the white horizontal bar is glittering turn the SCREEN control counterclockwise until the bar glit ters slightly 12 Set the service switch at NORMAL position 13 Set the BRIGHTNESS and CONTRAST controls to maximum 14 Adjust the GREEN and BLUE DRIVE controls R555 R557 to obtain proper white balanced picture in high light area 15 Rotate the BRIGHTNESS and CONTRAST controls to obtain dark gray raster Then check the white balance in low brightness the white balance is not proper adjust the CUTOFF controls only two CUT OFF controls in the statement 10 to obtain proper white balanced picture in low light area 16 Check the white balance again If it s not good re touch the CUTOFF controls and DRIVE controls to obtain a good white balance in both low and high light areas RGB 1 This adjustment must always be preceded by white balance adjustment of composite 2 Set the switch S201 to RGB and S101 to Analog RGB 3 Connect the monitor to a white pattern signal of Analog 4 NA RGB Adjust the GREEN and BLUE CUTOFF controls R253 R251 so as a good white balance in both low and high light areas Deflection yoke 11 mm Purity convergence magnet assembly Figure 9 SUB BRIGHTNESS ADJUSTMENT 1 Connect the monitor to a black pattern signal 2 Set the
32. controls to obtain a good tint and color respectively 12 HIGH VOLTAGE CHECK CAUTION There is no HIGH VOLTAGE ADJUSTMENT on this chassis The 115 volt power supply must be properly adjusted to insure the correct high voltage 1 Connect an accurate high voltage meter to the second anode of the picture tube 2 Turn on the color monitor Set the BRIGHTNESS and CONTRAST controls to minimum zero beam current 3 High voltage shall be below 27 5kV 4 Rotate the BRIGHTNESS control to both extremes to be sure the high voltage does not exceed the limit 27 5kV under any conditions 13 FS CIRCUIT CHECK The Fail Safe FS circuit check is indispensable for the final check in the servicing Checking should be done following the steps below 1 Turn the power switch on and adjust customer controls for normal operation 2 Temporarily short TP 9 and 6 on Main board with a jumper wire Raster and sound will disappear 3 The color monitor must remain in this state even after removing the jumper wire This indicates that the FS circuit is functioning properly 4 To obtain a picture again temporarily turn the color monitor off and allow the FS circuit more than 30 seconds to reset Then turn the power switch on to produce a normal picture FS circuit The FS circuit samples horizontal pulses should the high voltage rise above normal limits The FS circuit activates and prevents excessive anode voltage from being develop
33. djustment 1 Connect the color monitor to an H character pattern signal 2 Set the brightness control to click point 3 Turn the H WIDTH coil L403 until H 250 6 mm VERTICAL AMPLITUDE ADJUSTMENT NOTE This adjustment must always be preceded by vertical hold adjustment and vertical picture position adjustment 1 Connect the color monitor to a white pattern signal 2 Set the brightness control to click point 3 Turn the V HEIGHT control R352 until the picture height equals 182 5 mm FOCUS ADJUSTMENT 1 Connect the color monitor to an H character signal 2 Turn the focus control to obtain the best focus in the portion between the center and the left top corner of the display area WHITE BALANCE ADJUSTMENT NTSC Composite Set the switch S201 to COMP Connect the monitor to a white pattern signal of composite Set the COLOR control to minimum Turn the SCREEN control on T461 fully counter clockwise Set the service switch at SERVICE Turn the RGB CUTOFF controls R556 R558 R559 to obtain each CRT cathode voltage KR KG KB will be 100V DC using a high impedance voltmeter 7 Slowly turn the SCREEN control clockwise until any two horizontal color bars appear 8 Turn the CUTOFF controls counterclockwise so that two horizontal color bars of RGB in the statement 7 disappear 9 Turn the SCREEN control clockwise again until the third horizontal color bar
34. ed Check that the monitor returns to normal operation when pin 23 of IC501 on the Main Board is grounded with jumper wire Check if the voltage across capacitor C407 exceed 24V Faulty Power Circuit or Horizontal Circuit Defective Fail Safe Circuit po wl EI 1 Xl 2 up xc POWER CIRCUIT Too low or too high Check Error Amp circuit Q804 D814 etc NG Check fuse F802 Replace fuse and turn power switch on OK Measure voltage of 115V on power board Check Horizontal circuit 14 TROUBLESHOOTING CHARTS OK Check AC fuse and R803 NG Check Replace 0801 0804 0801 OK Check if voltage of C809 is approx 160V Yes No Check Rectifier circuit and wiring 3 Voltage appears Check over voltage protector D806 D813 etc y Take away D806 and check voltage 0V Check D818 and PWM circuit Q802 Q803 etc NO RASTER Check focus pack and CRT NO VERTICAL SYNC Check if heater of No CRT is lighting Is pulse of approx Y es 25V p p presented at 9 of FBT No Is voltage at 2 of FBT 115V Yes Is voltage of CRT Gs approx 7kV Is R427 open Check CRT Check power circuit 15 picture stabilized by rotating R351 Check V HOLD circuit and Q501 Check sync circuit and Q501 E Yes Is H osc
35. ee wedges recheck overall conver gence Tighten the screw firmly to hold the yoke tightly in place 8 Stick three glass cloth tapes on wedges as shown in figure 10 amp Adjust the angle Vertical lines 6 Pole Magnets Movement Fixed Rotate two tabs at the same time Horizontal lines Adjustment of magnets Figure 12 Tilt the Yoke right or left Tilt the Yoke up or down Circumference Convergence by DEF Yoke Figure 13 Dot Movement Pattern ees COLOR SYNC ALIGNMENT 1 Apply a color bar signal and warm up for five minutes 2 Connect a capacitor 0 47 mfd between terminal TP 42 and the junction of C204 and C205 3 Connect a resistor 1k ohm between pin 13 of IC501 and 11 volt source line 4 Set the controls as follows CONTRAST Minimum TINT Click COLOR Maximum 5 Adjust the color sync variable capacitor C551 on the Main Board so that the color bar pattern stands still or drifts slowly across the picture screen 6 Remove the capacitor and the resistor 7 Check that the color sync is stable with signal and power on off operation If the color is slow to appear or the color sync is out of order retouch the color sync variable capacitor C551 for proper color monitor SUB COLOR SUB TINT ADJUSTMENT 1 Apply a rainbow color signal of composite 2 Set the CONTRAST COLOR and TINT controls to click position 3 Adjust the SUB TINT R553 and SUB COLOR R554
36. een See figure 12 5 Adjust two tabs of 6 Pole Magnets to superimpose red blue line with green one Adjusting the angle affects the vertical lines and rotating both magnets affects the horizontal lines 6 Repeat adjustments 3 4 5 keeping in mind red green and blue movement because 4 Pole Magnets and 6 Pole Magnets interact and make dot movement complex 6 Pole magnets Purity magnet Convergence magnet assembly Figure 11 BLU RED RED BLU GRN 4 Pole Magnets Movement Center Convergence by Convergence Magnets m Circumference Convergence Adjustment NOTE This adjustment requires Rubber Wedges and Glass Cloth Tapes 1 Place a wedge as shown in figure 10 temporarily 2 Tilt front of the deflection yoke up or down to obtain better convergence of YH on top and bottom then ad just differential coil of deflection yoke to obtain better convergence of XV on left and right See figure 13 Push the mounted wedge into the space between the picture tube and the yoke to hold the yoke temporarily Place other wedge into bottom space Tilt front of the yoke right or left to obtain better con vergence in circumference See figure 13 5 Hold the yoke position and put another wedge in either upper space Place the wedge on the picture tube to hold the yoke 6 Detach temporarily mounted wedge and put it in another upper space Place it on the picture tube to fix the yoke 7 After placing thr
37. it Defective Q604 Q605 T601 R619 Check W661 pec Defective Q602 Q603 OK Connect capacitor 0 047 uF between pin 30 of Q501 and the base of Q605 Sound OK Yes Connect capacitor 0 047 uF between pin 30 of Q501 and the base of O 602 Sound OK Defective Q601 Sound VR R651 Connector P602 M111 15 CHASSIS REPLACEMENT PARTS LIST WARNING BEFORE SERVICING THIS CHASSIS READ THE X RAY RADIATION PRECAUTION SAFETY PRECAUTION AND PRODUCT SAFETY NOTICE ON PAGE 2 OF THIS MANUAL 15 a i e g ABBREVIATIONS Capacitors CD Ceramic Disk PF Plastic Film EL Electrolytic Resistors CF Carbon Film CC Carbon Composition MF Metal Film OMF Oxide Metal Film VR Variable Resistor FR Fusible Resistor All CD and PF capacitors are 5 50V and all resistors 596 unless otherwise noted LOCATION COMMODORE VENDOR NUMBER PART NUMBER PART NUMBER LOCATION COMMODORE VENDOR DESCRIPTION NUMBER PART NUMBER PART NUMBER DESCRIPTION MAIN BOARD p U902A 602083 42 CAPACITORS C201 C202 C203 C204 C205 C206 C207 C208 C209 C212 C213 C214 C215 C216 C301 C302 C303 C304 C305 C306 C307 C308 C309 C310 C311 C312 C313 C314 C315 C316 C317 C318 C319 C320 C325 C401 C402 C403 C404 C405 C406 C407 602081 86 602081 55 602080 43 602081 44 602081 52 602081 88 602082 2
38. minals before soldering 2 When replacing a high wattage resistor oxide metal film resistor on circuit board keep the resistor 10 mm 1 2 in away from circuit board 3 Keep wires away from high voltage or high temperature components 6 LOCATION FOR USER CONTROLS Eo Front View H Position Power Switch Contrast Volume Video Mode Switch Comp Sep RGB Rear View fw v DN s Headphone Jack AC Receptacle Audio Video Chroma IN RGB Mode Switch TERMINAL zs CRT DRIVE 8 MECHANICAL DISASSEMBLY A quuessesiq 71 2 anfi 5 jexeeds aui USL 1231 AY ANUBIS D g 5819s 34 Z M8J9S BU IWAOWSY H3AOO HV3H ux Ic lug IT l J p now 12220 Sy Figure 2 2 Mechanical Disassembly Video Terminal Boa rd 9 BLOCK DIAGRAM BUFFER 2SC752GYor O 2SCI8I5Yor Ox4 x M sw 2SC752GY K CONT VIDEO OUT 25 2068 3 25 388 3 2971822 E GTHT MI YZ DEF YOKE Sw E TOY 514 5 D Y 7 BUFFER 2SAIOI5Y or Ox 3 _ E A A A
39. ty area at four corners are equal Viewing the screen slide the yoke backwards until the complete screen presents a uniform green color With the yoke remaining in the position 10 check that the screen presents a uniform red color and a uniform blue color respectively by Red and Blue raster pattern signal 12 Viewing the screen turn the yoke and tighten the clamp screw of the yoke when the picture becomes horizontal 13 Proceed with convergence adjustment N O gt amp gt amd mounting Glass cloth Differential coil Rubber wedge Deflection yoke 1 Rubber wedge location Adhesive Figure 10 po quens d Wea WEIL ls clo dens n cR GM 4 24 4 2 CONVERGENCE ADJUSTMENTS NOTE Before attempting any convergence adjustments the color monitor should be operated for at least fifteen minutes m Center Convergence Adjustment 1 Allow the system to receive a crossbar pattern signal 2 Adjust the BRIGHTNESS and CONTRAST controls for well defined pattern 3 Adjust two tabs of the 4 Pole Magnets to change the angle between them See figure 12 and superimpose and blue vertical lines in the center area of the pic ture screen See figure 13 4 Turn both tabs at the same time keeping the constant angle to superimpose red and blue horizontal lines at the center of the scr
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