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SERVICE MANUAL VGA MONO MONITOR

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1. FULL CROSS HATCH PATTERN or FULL H PATTERN same condition as the adjustment method sequence 4 Center position detent of VR502 EXT BRT Set FULL WHITE PATTERN MODE3 Next set VR102 CONTRAST to max FULL H PATTERN order to make the total focus of the screen to optimal status ALIGNMENT INSTRUCTIONS Alignment Parts and Locations VR204 ae MODE V SIZE VR203 MODE V SIZE 2 WR202 MODE V SIZE 3 VR205 IC30 V LIN VR20 V HOLD IC302 T 501 H WIDTH FOCUS VR503 SUB BRIGHT L302 H LIN TSOI VR30 H HOLD VR40 C404 DC24V CONTROL TROUBLE SHOOTING 1 NO POWER No raster appears and power indicator is not ON in spite of supplying rated AC power input NO POWER Does 32VAC appear bet ween the secondary leads of T401 Check power cord SW401 F401 C401 C402 C403 Check T401 Does line voltage appear between the primary leads of T401 Does 24V appear between NO J401 and ground Check D401 4 C404 C405 Does 38V appear between the 1 pin of IC401 and ground Check IC401 D405 L401 C411 C412 C413 C420 YES Does the output pulse of IC302 appear at the 1 pin of IC302 Does 9 3V appear between the 6pin of IC302 and ground Check R324 R325 C303 C304 Check IC302 Does drive pulse appear at the base of T305 NO Check Q30
2. 110 120VAC 60HZ USA version 2 220VAC 50HZ Europe version Power consumption 1 AC 0 6A MAX USA version 2 AC 0 4A MAX Europe version Input 0 7Vp p Separate ANALOG signal Band width 30 MHZ at 3dB Video gain 20 Vp p min e Synchronous Type Separate TTL level 3 Mode Input synchronizing signals Horizontal 1 Frequency kHz 2 Polarity Vertical 1 Frequency 2 Polarity Resolution H X V ML2671 ML4671 e Cathode ray tube specification CRT size Face radius Remark ML2671 1200mm ML4671 1524mm ML2671 309X251X307 7 5 W STAND ML4671 320X308 4X326 8 3 W STAND Deflection angle 90 Implosion protection Shrinkage band with mounting lug Phosphor WD paper white Face Direct etched High voltage Anode voltage 12 KV 0 5KV at 1K 0 UA Voltage regulation 300V max 1K 0 to 40uA e Tilt 1 max e Picture linearity Horizontal 6 max Vertical 696 max e Geometric distortion Any horizontal and vertical lines should be within the horizontal and vertical 3 0mmi slits e Brightness Max brightness 80 F L USA 60 F L EUROPE e Contrast gain 12dB min e Signal cable pin connection Signal connector 15 pin miniature D shell type Connection Pin 1 no pin Pin 9 no Pin Pin 2 video signal Pin 10 no pin Pin 3 no pin Pin 11 no pin Pin 4 no pin Pin 12 digital ground Pin 5 self test Pi
3. CONTRAST D101 D102 D104 G1G2G4 H V C101 IN SIGNAL PCB Q101 Q102 Q103 Q104 Q104 Q104 R101 R102 R103 R104 R105 R106 R107 R108 R109 R110 R111 R115 R116 R117 R118 1419 204 820 1419 106 250 1419 901 100 3344 153 010 2169 301 410 2169 301 410 2169 406 020 3344 120 810 7108 530 061 2109 104 610 3344 120 060 3006 300 340 2139 401 750 2139 301 070 2149 301 360 4543 704 210 5684 706 310 2149 302 300 1018 277 561 1018 277 121 1018 277 302 1018 277 332 1018 277 222 1018 277 333 1018 277 472 1018 277 222 1018 277 102 1018 277 222 1018 277 471 1018 277 472 1018 277 470 1018 277 470 1018 277 560 C CERAMIC HK CK45 50V 0 1M Z C CERAMIC HK CK45 B 500V 0 01M K C CERAMIC HK CK45 B 1KV 0 01M K CONNECTOR PIN BASE B2B XH A JST DIODE 1N4148 DIODE 1N4148 DIODE ZENER 1N4741A 11V PIN BASE JST RTB 1 5 3 VO WHT SCREW TAP PH 2S 3x6 FE FZY IC M51392P CONNECTOR PIN BASE B8B XH A PCB CRT ML4671 105x67x1 6T TRANSISTOR 2N3906 SST TRANSISTOR 2N3904 TRANSISTOR 2N2369 SHIELD B VIDEO SPTE T0 306 HEAT SINK VIDEO SBC 1 T1 0 FE FT 2 TRANSISTOR MPS U06 R CARBON RD 1 4T 560 J R CARBON RD 1 4T 120 J R CARBON RD 1 4T 3K J R CARBON RD 1 4T 3 3K J R CARBON RD 1 4T 2 2K J R CARBON RD 1 4T 33K J R CARBON RD 1 4T 4 7K J _ 1 4T 2 2K J R CARBON RD 1 4T 1K J R CARBON RD 1 4T 2 2K J R CARBON RD 1 4T 470 J R CARBON RD 1 4T 4 7K J R CARBON RD 1 4T
4. R520 R521 R530 T301 TR TR TR TR V DY VR201 VR202 VR203 VR204 VR205 VR301 VR401 VR501 VR503 1018 277 182 1018 277 125 1018 277 225 1018 277 823 1018 277 103 1049 427 221 2849 031 611 7304 701 110 7208 113 001 7048 130 121 7304 700 920 3344 127 710 1241 110 010 1241 110 014 1241 110 006 1241 110 006 1241 110 005 1241 108 003 1241 108 011 1241 108 012 1241 108 010 0509 400 116 1509 121 260 1609 401 680 1609 401 480 1419 204 820 1419 204 820 1609 402 230 1419 109 140 1417 318 101 1609 403 090 Description R CARBON RD 1 4T 1 8K J R CARBON RD 1 4T 1 2M J R CARBON RD 1 4T 2 2M J R CARBON RD 1 4T 82K J R CARBON RD 1 4T 10K J R METAL OXIDE RS1P 220 J TRANS H DRIVE 19x7 6MM WASHER REC SBC 1 T1 5NI NUT HEX 1 M3 FE FZY SCREW RH M3Z12 FE FZY WASHER PLAIN 954810 FE PZW CONNECTOR PIN BASE JST RTB 1 5 2F VR SEMI CET 117A B100K VR SEMI CET 117A B200K VR SEMI CET 117A B500K VR SEMI CET 117A B500K VR SEMI CET 117A B50K VR SEMI CET 92A B5K VR SEMI CET 92A BIK VR SEMI CET 92A B2 5M VR SEMI CET 92A B250K PCB CRT FILTER WIRE SO COPPER TA 0 6 SN C POLVESTER CQ921M 100V 0 01M J C ELECTROLYTIC CEOAW 25V 10M C ELECTROLYTIC CEO4W 16V 220M C CERAMIC HK CK45 50V 0 1M Z C CERAMIC HK CK45 F 50V 0 1M Z C ELECTROLYTIC CEO4W 50V 3 3M C CERAMIC HK CK45 B 50V 0 01M Z C CERAMIC HK CK45 T 50V 100 K C ELECTROLYTIC CEO4W 100V 47M 29 Remark C112 C510 C511
5. 47 J R CARBON RD 1 4T 47 J R CARBON RD 1 4T 56 J 30 Ref No _ Description Remark R119 R120 R121 R122 R123 R125 R130 R509 R510 R511 R512 R501 505 502 503 504 SOCKET VIDEO VR101 PCB R401 C401 C402 C403 C415 GND F401 F401 F401 1018 277 101 1018 277 102 1018 277 820 1045 527 471 1045 527 471 1045 427 680 1018 277 102 1045 427 680 1018 377 102 1018 377 473 1018 377 102 2029 010 010 2029 010 010 4569 001 110 4569 001 110 4569 001 110 3353 700 910 3344 153 020 1241 110 004 POWER PCB 3006 300 350 3344 131 020 1018 377 684 1565 523 224 1461 137 806 1461 137 806 _ 1565 523 473 3124 700 810 3364 700 210 4709 088 050 4709 060 010 2429 646 510 R CARBON RD 1 4 100 J R CARBON RD 1 4T 1K J R CARBON RD 1 4T 82 J R METAL OXIDE 2P 470 J R METAL OXIDE 2P 470 J R METAL OXIDE RS 1 68 J R CARBON RD 1 4T 1K J R METAL OXIDE RS 1P 68 J R CARBON RD 1 2T 1K J R CARBON RD 1 2T 47K J R CARBON RD 1 2T 1K J LAMP NEON DMS 90 130V DC LAMP NEON DMS 90 130V DC SPARK GAS S 23 1KV SPARK GAS S 23 1KV SPARK GAS S 23 1KV SOCKET CRT 7PIN CONNECTOR PIN BASE B3B XH A JST VR SEMI CET 117A B200 PCB POWER AC ML4671 62 5x50x1 6T ONNECTOR WAFER B3P VH 3P 3 96 R CARBON RD 1 2T 680K J C M POLYESTER AC CQS 922M 250V 0 22M M C CERAMIC AC DE 7100F 222 MVAI C CERAMIC AC DE 7100F 222 MVAI C M POLYESTER AC CQS922M 250 0 04
6. CONNECTOR DY ASSY CONNECTOR V DY CONN HORZ DY ASSY 2x22AWG CAT MONOCHROME 12ABV ML2671 ONLY CRT MONOCHROME 14HBY WDN ML4671 ONLY TRANS POWER ASSY P 115V S 30V TRANS POWER ASSV P 230V S 30V FOR EUROPE VERSION LUG TERMINAL ASSV AWG 18 BLK L 150 POWER CORD AC ASSY K0101A5213 POWER CORD AC ASSY LP34 H05 FOR EUROPE VERSION GND WIRE ASSY BLK L 150MM 1015 18 T 32 _ SEMICONDUCTOR IDENTIFICATION IC101 IC302 lC301 9 D 7 MC1391P 51392 0305 0101 0102 0201 Q301 en Q302 Q303 0304 Q501 203904 232369 233906 KSC1008 SGSF461 num 0 0 6 H WAVEFORMS Waveform Measurement Conditions 1 The voltage level and waveform at each point are given below on the rated input power when this set 25 Vp p H is connected to a personal computer with a video signal input at a white pattern with contrast 2 indicates the waveform check points In the chart waveforms are measured from the point u indicated to chassis ground por Leu 9 22 MW 2 2 H 1 Vp p H 4 6 5 5 210 J H 2 4 40 33 3410 SCHEMATIC DIAGRAM MODEL NO ML4671 ML2671 GND CHASSIS NO GSI 1 GND WARNING THIS NONITOR CONTAINS SAFETY CRITICAL COMPONENTS ALL PARTS SHOWN IN THE SHADED AREAS OF THE SCHEMATIC ARE SAFETY CAITICAL FOR CONTINUED SAFETY REPLACE SAFETY CRITICAL COMPONENTS ON
7. R314 R320 R321 R322 R323 R324 R325 R326 R327 8328 R329 R330 R331 R355 R403 R404 R405 R406 R410 R411 R502 R503 R504 R505 R506 Part No 1018 277 331 1018 277 103 1018 277 222 1018 277 273 1018 277 272 1018 277 472 1018 277 472 1018 277 102 1018 277 182 1018 277 102 1018 277 153 1018 277 104 1018 377 331 1018 277 331 1018 277 123 1018 277 332 1018 277 103 1016 377 829 1018 277 101 1018 277 471 1045 527 391 1018 277 152 1018 277 153 1018 277 392 1018 277 122 1018 277 331 1018 277 102 1018 277 103 1018 277 472 1018 277 685 1018 277 124 1018 277 334 rm R CARBON TD 1 4T 330 J R CARBON RD 1 4T 10K J R CARBON RD 1 4T 2 2K J R CARBON RD 1 4T 27K J R CARBON RD 1 4 2 7K J R CARBON TD 1 4T 4 7K J R CARBON TD 1 4T 4 7K J R CARBON TD 1 4T 1K J R CARBON RD 1 4T 1 8K J R CARBON RD 1 4T 1K J R CARBON RD 1 4 15K J R CARBON TD 1 4T 100K J R CARBON RD 1 2T 330 J R CARBON RD 1 2T 330 J R CARBON RD 1 4T 12K J R CARBON RD 1 4T 3 3K J R CARBON RD 1 4T 10K J R CARBON RD 1 2T 8 2 J R CARBON RD 1 4T 100 J R CARBON RD 1 4 470 J R METAL OXIDE RS2P 390 R CARBON RD 1 4T 1 5K J R CARBON RD 1 4T 15K J R CARBON RD 1 4T 3 9K J R CARBON RD 1 4T 1 2K J 1 4 330 J R CARBON RD 1 4T 1K J R CARBON RD 1 4T 10K J R CARBON RD 1 4T 4 7K J R CARBON RD 1 4T 6 8M J R CARBON RD 1 4T 120K J R CARBON RD 1 4T 330K J 28 R507 R515 R516
8. corresponds to 0 5milliamp AC or more is excessive and indicates a potential shock hazard which must be corrected before returning the display monitor to the user SAFETV NOTICE Manv electrical and mechanical parts in this chassis have special characteristics often pass unnoticed and the protection afforded bv them can not necessarilv be obtained using replacement components rated for higher voltage wattage etc Replacement parts that have these special safetv characteristics are identified in this manual and its supplement electrical components having such fea tures are identified bv a l in the Parts List and Schematic Diagrams Before replacing anv of these components read the Parts List in this manual carefully The use of sub stitute replacement parts that do not have the same safetv characteristics as specified in the Parts List mav create shock fire or other hazards 0 15MF TEST PROBE TO EXPOSED TO KNOWEN METAL PARTS EARTH GROUND Figure 1 Leakage Current Test Circuit THEORV OF OPERATION GENERAL This is a high resolution monochrome displav monitor using a paper white phosphored CRT with etched faceplate It uses one video signal input and separated sync signals It can operate in all of the VGA modes DESCRIPTION 1 Main Board 1 1 Power Supply This is a constant frequency switch mode power supply using L4960 monolithic integrated circuit The output voltage regulation is achieved b
9. replaced ML2671 1 FRONT VIEW 1 Power Switch 2 REAR VIEW SIGNAL CABLE POWER CORD 2 Power Indicator 3 Brightness Control 4 Contrast Control 5 Signal Cable 6 Power Cord MAJOR OPERATING COMPONENTS POWER SWITCH POWER INDICATOR Push the power switch to turn the unit ON TIN m AL When the monitor is on the power indicator Green will light go on Turning this control adjusts the overall brightness Turning this control adjusts this displav contrast Connector to the terminal of CPU Connect with specified outlet ML4671 1 FRONT VIEW 1 Power Switch 2 REAR VIEW BRIGHTNESS CONTRAST 2 Power Indicator 3 Brightness Control 4 Contrast Control 5 Signal Cable 6 Power Cord MAJOR OPERATING COMPONENTS r POWER SWITCH z IK Z POWER INDICATOR TA Push the power switch to turn the unit ON FI i ll SIGNAL CABLE POWER CORD When the monitor is on the power indicator Green will light go on Turning this control adjusts the overall brightness Turning this control adjusts this displav contrast Connector to the terminal of CPU Connect with specified outlet DISASSEMBLY INSTRUCTIONS 1 Fig A CABINET Loosen two screws A holding Cover Rear and Cover Front and the screw B in order to release the
10. 01 R200 R201 R202 R203 R204 R205 R206 R207 R208 R209 R210 R215 R216 R217 R218 R219 R220 R221 R225 R226 R227 R240 R300 R301 2149 301 437 2149 304 120 3914 700 410 3934 103 110 4542 707 110 2859 129 010 2139 204 070 1018 277 331 1018 277 273 1018 277 331 1018 277 274 1018 277 103 1018 377 100 1018 277 563 1018 277 304 1018 277 274 1018 277 125 1018 277 563 1018 277 823 1018 277 272 1018 277 273 1018 277 473 1018 277 339 1018 277 123 1018 377 109 1018 277 222 2028 377 182 1018 277 100 1018 277 683 1018 277 331 1018 277 273 Description Remark TRANSISTOR 2N3904 TRANSISTOR KSC1008 Y T TRANSISTOR SGS F461 PLATE MICA 3M PC 22x28 50 INSULATOR TR 4 5 8D 2 2H N66 C 0 SHIELD FBT SBC 1 SN ML4671 TRANS FBT FMG 1235EL TRANSISROR MPS A45 R CARBON RD 1 4T 330 J R CARBON RD 1 4T 27K R CARBON RD 1 4T 330 J R CARBON RD 1 4T 270K J R CARBON TD 1 4T 10K J R CARBON RD 1 2T 10 J R CARBON RD 1 4T 56K J R CARBON RD 1 4T 270K J R CARBON RD 1 4T 270K J R CARBON RD 1 4T 1 2M J R CARBON RD 1 4T 56K J R CARBON RD 1 4T 82K J R CARBON RD 1 4T 2 7K J R CARBON RD 1 4T 27K J R CARBON RD 1 4T 47K J R CARBON RD 1 4T 3 3 J R CARBON RD 1 4T 12K J R METAL FILM RM 1 2T 1 J R CARBON TD 1 4T 2 2K J R CARBON TD 1 4T 1 8K J R CARBON RD 1 4T 10 J R CARBON RD 1 4T 68K J R CARBON RD 1 4T 330 J R CARBON RD 1 4T 27K J 27 Ref No R302 R303 R304 R305 R310 R312 R313
11. 2 0503 0504 0530 G1G2G4 H IC H DV HM XIC201 C301 1C302 XIC401 IC401 1302 1 303 L401 LED PCB Q201 Q301 2169 206 100 2169 301 410 2169 403 697 2169 206 190 2169 206 100 2169 201 240 2169 201 240 2169 201 240 2169 201 240 2169 219 330 2169 206 020 2169 206 170 2169 206 170 2169 206 100 2169 403 557 3344 153 010 3054 614 910 7108 530 061 3344 112 010 3344 153 040 2119 101 270 2109 104 700 2119 103 130 2119 601 900 5682 702 710 2449 733 210 2449 433 310 2429 060 110 3344 153 010 3006 300 310 2139 301 070 2139 301 070 2139 301 070 DIODE RGP10G DIODE 1N4148 DIODE ZENER RD 6 8EB1 T DIODE RGP30G DIODE RGP10G DIODE 1N5402 200V 3A DIODE 1N5402 200V 3A DIODE 1N5402 200V 3A DIODE 1N5402 200V 3A DIODE RG2Y BYW 100 100 DIODE RGP 01 12 RGPO2 12 DIODE RGP 15J DIODE RGP 15J DIODE RGP 10G DIODE ZENER RD 5 1EB1 T CONNECTOR PIN BASE B2B XH A JST CONNECTOR 3P ASSY JST HOUS 3P SVF 300MM SCREW TAP 25 3 6 FZY CONNECTOR WAFER 5273 02A MOLEX CONNECTOR PIN BASE B5B XH A JST IC TDA1170N 2136 IC XS74HCTLS86N IC MC1391P IC POWER L4960 HEATSINK IC A1050S H14 2 0 WHT COIL H LINEARITV 5 0 18 3UH COIL H WIDTH 7 0 29 9UH COIL CHOKE 200UH CONNECTOR PIN BASE B2B XH A JST PCB MAIN ML4671 197x153x1 6T TRANSISTOR 2N3904 TRANSISTOR 2N3904 TRANSISTOR 2N3904 26 2139 301 070 Q303 Q304 Q305 Q305 0305 0305 1302 Q5
12. 314 appear at the 12 pin of IC101 D302 VES IC1012 VES Check IC101 Is the waveform at the NO Check 0101 0103 0104 to cathode of D102 similar the waveform at the 8 pin of IC101 except blanking pulses Q201 D101 D102 R111 R116 R117 VES Does the proper video signal appear at the collector of Q104 NO Check Q104 R120 R122 R123 R130 Check 121 5501 CRT socket 15 4 IMPROPER HORIZONTAL OR VERTICAL SYNCHRONIZATION There is no stable It moves horizontal or vertical direction IMPROPER SYNC Do proper horz and vert svnc signals appear at the end of signal 2 NO Check signal cable Check IC301 D530 Does proper vert sync R530 C530 531 signal appear atthe 3 pin of IC301 Bene ee Zar rn KONOLKIC2O1 2202 C203 VR201 R206 Check IC301 0303 R303 R304 R305 C302 D530 R530 C530 C531 Does picture moves horz direction NO Does proper horz sync signal appear at the 3 pin of IC302 Check IC302 VR301 R322 C305 C306 C311 C312 5 BLANKING FUNCTION DEFECT Vertical retrace line appears on the screen when the external brightness control VR502 is set to the high range BLANKING FUNCTION DEFECT Does 5V appear between the cathode of D530 and ground Check R530 D530 C530 C531 NO Check Q201 R225 R226 R227 C215 16 Top View P C
13. 329 102 1417 318 331 1505 723 103 1603 905 471 1603 905 471 1417 344 104 1608 904 100 1603 905 471 1609 402 250 1505 723 104 1505 723 562 1517 353 223 1419 901 100 1609 403 100 1609 401 700 1609 403 180 1417 344 104 1608 903 101 2169 301 410 2169 301 410 Description Remark C POLVESTER CQ921M T 100V 0 001 C POLYESTER CQ921M T 100V 0 0033 K C ELECTROLYTIC CEO4W T 50V 1M C POLYESTER CQ921M 100V 0 1M J C POLYESTER CQ921M T 100V 0 01 J C POLYESTER CQ921M 100V 0 0027M J C POLYESTER CQ921M 100 0 1M J C POLYPROPYLENE CQ922M 630V 0 018M J C M PAPER CHO21H 250V 2 5M K C ELECTROLYTIC CEO4W 63V 2200UF 22X30 C CERAMIC HK CK45 T 50V 0 1M Z C POLVESTER CQ921M T 100V 0 0022 J C CERAMIC HK CK45 T 50V 1000 C CERAMIC HK CK45 T B 50V 330 K C POLVESTER CQ921M T 100V 0 01 J C ELECTROLYTIC CE04W 35V 470M C ELECTROLYTIC CEO4W 35V 470M C CERAMIC HK CK45 T F50V 0 1M Z C ELECTROLYTIC CEO4W T 25V 10M C ELECTROLYTIC CEO4W 35V 470M C ELECTROLYTIC CEO4W 50V 10M C POLYESTER CQ921M T 100V 0 1M J C POLVESTER CQ921M T 100V 0 0056M J C M POLYESTER CF922M 630V 0 022M J C CERAMIC HK CK45B 1KV 0 01M K C ELECTROLYTIC CEO4W 100V 100M C ELECTROLYTIC CEO4W 25V 330M C ELECTROLYTIC CEO4W 160V 2 2M C CERAMIC HK CK 45 T F 50V 0 1M Z C ELECTROLYTIC CE04W T 16V 100M DIODE 1N4148 DIODE 1N4148 25 Q302 D203 D301 D302 0303 0304 D401 D402 D403 D404 D405 0501 050
14. 4 R329 T301 Check Q305 D303 C315 T302 2 NO RASTER Power supplv and horizontal circuits operate normallv but there is no raster NO RASTER Is the heater of CRT bright reddish Does 12V appear between the 4 pin of CRT and ground2 Check R509 0503 Check CRT socket CRT Does 12 5KV appear NO between the anode of CRT and ground Check T302 Does 650Vp p flyback pulse appear between the 9 pin of T302 and ground Does 600V appear between the 6 pin of CRT and ground NO Check T302 VES VES Check 5503 511 511 0501 Is the voltage of G1 changed the position of brightness controls VR502 VR503 2 NO Check VR502 VR503 Brightness connector assy YES Does 60V appear between the cathode Check 0502 7302 of D502 and ground a Check CRT socket CRT 14 3 NO PICTURE No picture on screen video signal source is connected NO PICTURE Does 60V appear between NO the cathode of D502 and Check D502 T302 C111 ground C112 C516 YES Does proper video signal NO appear the 1 pin of Check signal cable VR101 IC101 C101 C102 VES Does proper video signal NO Does 12V appear between NO Check R125 0104 appear at the 8 pin of the 14 pin of IC101 06108 2104 16101 0 and ground Does 4 5Vp p flyback pulse Check R313 R
15. 4 ped C312 3 3K I GND 50 D D AGP 106 L401 AC 200UH R405 L 3 9K 0502 50444 AGP15J GND 25V VR401 C411 JhC412 C413 516 INE RC MEE a5 C V ADJST 3 0405 N 9406 1 2K 34 35 CIRCUIT DIAGRAM DISPLAV SVMBOLS 1 Resistor e Resistance value When no unit is provided Q K O Q e Rated permissible power capacitv When no displav is mode 1 4 W Others Displav are provided e Resistor type Under than 1 2 W Carbon resistor Over than 1 W Oxidized metal film resistor 2 Capacitor e Capacitance When no unit is provided 1 Electrolytic uF 2 E T C pF Others Display are provided e Withstand voltage No displav 1 Polyester DC 100 2 DC 50 V Others DC withstand voltage V AC display AC withstand voltage V e Capacitor type type display Ceramic and electrolytic capacitor P Polyester capacitor MP Metallized polyester capacitor PS Polystyrene capacitor 36 mode 3 RMS MEASUREMENT RESULTS OF THE IC S Measured with high impedance V T V M or circuit tester under the rated line voltage Voltage reading may vary 4109 Video signal is a white pattern and IC101 IC201 IC301 M51392P TDA1170N 74LS86 Unit Volts IC302 MC1391P ICS PIN NO 38 5 ON N IC401 L4960 Memo Printed in Korea Code No 8146 400 040
16. 7 383 104 210 1608 904 470 211 1417 318 101 212 1608 905 220 C213 1505 723 104 C214 1609 401 510 C215 1608 908 068 C220 1417 318 221 C300 _ 1417 318 101 C301 1608 906 047 C302 1509 121 070 C303 1417 344 104 C304 1609 402 120 C305 1509 452 180 WIRE SO COPPER TA 0 6SN CONN 8P ASSY ML4671 C CERAMIC HK CK45 B 50V 470 C POLVESTER CQ921M 100V 0 1M J C POLVESTER CQ921M 100V 0 15M J C CERAMIC HK CK45 T F50V 0 1M Z C ELECTROLYTIC CEO4W 25V 1000M C ELECTROLYTIC CEO4W 35V 100M C POLVESTER CQ921M T 100V 0 0033 K C M POLVESTER CF922M 250V 0 1M J C POLVESTER CF922M 250V 0 1M J C ELECTROLYTIC CE04W T 25V 47M C CERAMIC HK CK45 T B50V 100 C ELECTROLYTIC CEO4W T 35V 22M C POLVESTER CQ921M T 100V 0 1M J C ELECTROLYTIC CEO4W 16V 1000M C ELECTROLYTIC CEO4W T 100V 0 68M C CERAMIC HK CK45 T B50V 220 K C CERAMIC HK CK45 T B50V 100 K C ELECTROLYTIC CE04W T 50V 0 47M C POLYESTER CQ921M 100V 0 0027M J C CERAMIC HK CK45 T F50V 0 1M Z C ELECTROLYTIC CE04W 35V 330M C POLYSYTRENE CQ09S 50V 1500 J 24 Ref No C306 C307 _ C308 C311 C312 C313 C314 C315 C316 C404 C405 C406 C407 C408 C409 C412 C413 C414 C420 C501 C502 C503 C504 C515 C516 C517 C518 C530 C531 D201 _ 0202 Part No 1505 725 102 1505 724 332 1608 906 109 1509 121 260 1505 723 103 1509 121 070 1509 121 260 1507 553 183 1539 001 250 1603 957 222 1417 344 104 1505 723 222 1417
17. 707 510 COVER REAR NORYL PX1005 VO BGE eo ad SSTGISTRAIS Ci IG IN ai 818 8 1218 a gt l gt Ni 5 EA B o 4 3 5682 702 710 HEATSINK IC AIOSOS HI4 T2 0 WHT 2149 202 330 TRANSISTOR 000033 7048 130 121 3 12 FE 304 701 110 BC I 5 NI 542 705 321 BC 1 SN 328 103 004 1 3 0 FE FZY o 8 7 6 934 103 110 2H N66 VO 208 113 001 l M3 FE FZV 7008 1 40 253 M4X25 FE FZB 7128 540 150 25 4 15 FE FZY 4 W 32 M904 000 4030 ASSY TRANS ML 4671A ASSY PCB POWER AC ML 4671 SCREW TH M4X8 FE FZY a gt n o lt 79 79 m gt o 9 8 7 6 S SCREW TAP PH 2S 3X8 FE FZY W WASHER SCREW TAP RH 25 3 8 FE FZY KD AIIN j QINDIi gt ojojo Oo 2S 3X8 FE L4960 SGS 25 3 8 FE FZY W WASHER LASSY PCB MAIN 4671A 4 3 es fee 88 8 18 18 8 je 8 18 18 8 Je 88 13 gt gt olnjola sjol jo ol lol 2 5684 701 710 HEATSINK IC 1170 5 TI O SN NORYL PX1005 VO BGE 20 6021 702 510 CHASSIS FRAME 5 M90 000 4020 455 28 4671A 7148 530 081 ScREW TAP PH FE Fav WWASHE
18. 7M M PIN GT 14 2MM 2 35PI HOLDER FUSE FC51E 20M M FUSE FUSE 518 250V 1A 20MM FUSE T250V 0 5A 20MM SEMCO COIL LINE FILTER 6MH 11x16MM 31 Ref No T401 CRT G CRT G VR102 CONTRAST CONTRAST VR502 BRIT LED LED LED LED LED SW401 SW401 SW401 SW401 SW401 DY V DY H DY CRT CRT T401 T401 Q104 AC AC GND Part No 3344 156 320 MISCELLANEOUS 3054 224 210 3054 224 220 1201 102 902 3054 617 620 4049 032 011 1201 102 961 3051 640 610 2309 110 090 0659 422 500 3054 640 810 0659 410 021 0659 410 621 3529 702 210 0659 422 500 3054 648 310 3054 617 040 0659 410 021 3054 402 040 2439 054 230 3054 613 750 3054 618 810 2019 125 410 2019 132 610 2869 298 030 2869 298 040 3054 223 730 3054 815 210 3054 812 310 3054 302 210 CONNECTOR WAFER B2P LV TN GND CRT ASSY ML2671 3 16 0 2 GND CRT ASSY ML4671 3 16 0 12 T815 VR ROUND 18SN 10SK B5K CONNECTOR 2P ASSY JST 2 2 5 L 340 FERRITE CORE RING 18 8 VR ROUND 18SNC1 10SK 50 CONNECTOR 2P ASSV JST HOUS XHP 2 2 5 BRT LED KLG 208E TUBE HISHI U C SUMITUBE F2 DIA 3 2 FD5 BLK CONNECTOR 2P ASSV JST XHP 2 B TUBE VINYL U C AWGO 300V 105 C C CLR TUBE VINYL U C AWG6 300V 105 C C CLR SWITCH PUSH ESB8213V TUBE HISHI U C SUMITUBE F2 DIA3 2 FD5 BLK CONN 2P ASSY H YHR 3N L 150M M CONNECTOR AC ASSY REP ASSY TUBE VINYL U C AWGO 300V 105 C C CLR _ CABLE SIGNAL ML4671 DEFL VOKE DMK 1294EL 3
19. ASSY CONTRAST VR MD 1267 xD 25 3 8 AIOBOS Hi4 T2 0 MHT FE FZY O 7304 701 110 WASHER REC 2159 401 020 TRANSISTOR 3914 700 410 PLATE MICA GHIELD FBT WASHER SPRING 3934 103 110 INSULATOR TR NUT HEX 7148 530 081 SCREW TAP RH 2119 601 900 IC POWER 7154 230 081 SCREW TAP PH ASSY PEB MAIN HEATSINK TC 1170 SCREW RH 21 7328 204 00 WASHER TOOTHED 20 6021 702 510 CHASSIS FRAME 267 iD MD i267 ESB 813 tM3X8 FE FZY PPO VO BGE iM905 000 2704 ASS Y BRIGHT VR MD 1267 SWITCH PUSH ESB 8213V is 7048 130 081 SCREW RH M3xe FE 115 7622 701 510 PPO VO BGE MLAG7IA 25 3X8 FE FZYW WASHER 11 4642 706 10 SHIELD VidEO stee Toss 6460 700 210 2 M804 000 3260 assy oy ML 257 Ta 701700 EARTH PLATE pass SP H TO3 6 7 28 540 201 SCREW TARTH 2s 4xzort rzv 5 7304 10 90 WASHER PLAN 6526 FE FZY 3 6674 715 210 2 908 000 2600 1 7622 701 810 KNOB POWER PPO vo BGE CODE NO DESCRIPTION SPECIFICATION 20 21 EXPLODED VIEW ML4671 3M PC 22X85 7048 140 081 ISCREW RH FE FZY 7328 204 00 B PI6X PI4XTO5 FE FZY 101 190 165216 FE FZV 054 811 810 POWER CORD 25 4040 202 010 STONAL CABLE 25 4040 77 8114 144 210 WHITE PAPER 120 6000
20. BOARD VIEWS Main PCB 17 Video Top View Bottom View CAUTION CONTINUED PROTECTION AGAINST FIRE HAZARD REPLACE ONLY WITH SAME TYPE AND SAME RATING e 18 WIRING DIAGRAM BLACK ML2671 VR502 OF WHITE BLUE SHIELD YELLOW BLACK RED MAIN VR502 ji RED GREEN SW40I WHITE BLACK CRT PCB E EUROPE VERSION WHITE BLACK COAXIAL WHITE BRN BLACK SHIELD GND WHITE BLU GREEN SIGNAL CABLE Ib POWER CORD 19 EXPLODED VIEW A 543 704 210 SHELD B VIDEO SPTE TO306 402 040 CABLE SIGNAL ASSY ML 4671A 3053 815 210 POWER CORD AC ASSY 1256A 40 LABEL RATING POLYESTER 0166 ML267 709 COVER BACK PPO VO BGE MD 1267 2 SCREW TAP RH 25 3X12 FE FZY 3 SCREW PH M4X25 FE FZB 6601 703 010 HOLDER CORD L NORVL PX 1005 00 ML 4671 0 ASSY PCB POWER AC ML 4671 7028 140 081 SCREW TH M4X8 FE FZY 7154 230 081 SCREW TAP PH 2S 3X8 FE FZY W WASHER 7148 530 08 SCREW TAP RH 25 3X8 FE FZY 5682 702 710 HEATSINK IC 1050 HI4 T2 0 WHT 7048 130 121 SCREW RH 3MX12 FE FZY 5 8 8 9214 SIN 919 5 gt T a N x MAD ojo aje ojo ojo eje Qin a o 3 2 7 6 4 bie bla Olu gt to 0 lt gt 2 72 2
21. Cover Rear from the Chassis Frame and the screw C in order to release Cover Rear from the Back Holder Cord Remove the Cover Rear by pulling Cover Rear backward while pushing the inner latches in direction of E using two jigs D 2 Fig B PWB s 1 The CRT must be discharged firstly Refer to the high voltage discharge procedure for important safety precau tions 2 Remove the CRT s anode from the CRT 3 Disconnect the ground lead and remove the PWB CRT FIGURE A CABINET CRT FIG 1 LA ERRANS POWER PWB Ae from the Chassis Frame 4 Remove Chassis Frame from the Cover Front by loosen ing screws b 5 Loosen two screws c holding the Chassis frame and Back Holder Cord 6 Loosen five screws d from the Chassis Frame and remove PWB Main 7 loosen two screws e from the Chassis Frame and remove PWB Power 8 Loosen four screws f to remove Trans Power from the Chassis Frame 9 Remove the lug terminal from the Chassis Frame by unscrewing g FIGURE B PCB CHASSIS FRAME FIG2 Ol VIDEO INTERFACE 101 VIDEO OUTPUT 0105 0104 VIDEO DRIVE 0101 0102 VIDEO c SIGNAL BRIGHTNESS VR502 CONTRAST VRIO2 DY CRT CONTROL CIRCUIT SYNC VERT INTERFACE DRIVE 8 OUTPUT MSIDA I 301 1c 201 L201 1L301 HORZ DRI er ORZ DRIVE HORZ SYNC Q303 Q304 OUTPUT 1C302 T301 0305 NOISE POWE
22. LY WITH MANUFACTURER S RECOMMENDED PARTS REFER TO PARTS LIST FOR EXACT REPLACEMENTS AVERTISSMEN recerteur EST EQUIPE DE COMPOSANT CRITIQUES POUR LA SECURITE TOUTES LES PIECES INDIQUEES DANS LES ZONES OMBREES DU SCHEMA SONT CRITIQUES POUR LA SECURITE POUR MAINTENIA LE DERGE DE SECURITEDE L APPA REIL NE REPLACER LES V1 1 4HBYWDN COMPOSANTS DONT LEE FONCTIONNEMENT EST CRITIQUE POUR LA SECURITE QUE PAR DES PIECES VIDEO RECOMMANDEES PAR LE FABRICANT CONSULTER LA NOMENCLATURE DES PIECES POUR TROUVER LES PIECES DE RECHANGE EXACTES X N ilt E SA 4 RESISTANCE IS SHOW IN OHM 1 000 M 1 000 000 RATED POWER OF RESISTOR NOT NOTED IN SCHEMATIC DIAGRAM IS 1 4W su cont 0 04 2 CAPACITANCE IS SHOWN IN UF P UUF PICO FARAD RATED VOLTAGE IN SCHEMATIC DIAGRAM IS 507 3 ABBREVIATION MD R METAL FILM MO R METAL OXIDE C POLYESTER NP NON POLAR CAPACITOR B C POLYPROPYLENE MB C METAL POLYESTER P3 C POLYESTYRENE 4 VOLTAGE IS READ WITH SSVM FROM INDICATED POINT TO SIGNAL GROUND 5 THIS SCHEMATIC DIAGRAM IS SUBJECT TO CHANGE FOR FURTHER IMPROVEMENT SR Stace 45 GA D 9 D 8 Q Q La BSOK EXT BRT SR 1N4148 D202 1N4148 VS FBT FM6 1235FL 48 508 11 6UH H WIDTH H LIN HS i 7 10 7 8 TT GND 6 C302 8305 MC1394P 12 C300 R303 GI 100 10K 2700 27K E R320 342 RGP15J 226 47 2N390
23. R 16 4542 706 110 SHIELO videO ser 10 305 15 M904 000 3260 assy DY ML_2571A 4 4554 701 010 EARTH PLATE 853 5 TO 3 702 210 WASHER RUBBER C R BLK 7128 540 201 SCREW TAP TH 25 axa0 FE FLY 11 2019 132 610 CRT MONOCHROME 14HBYWDN M905 000 2580 ASSY BRIGHT VR 4671A 9 7622 701 610 KNOB VR PPO VO BGE 8 905 000 2590 ASSY CONTRAST VR ML 4671A NORYL PX1005 VO BGE 6 ms05 000 2600 Assy Led Im 5 3529 702 710 SWITCH PUSH Jess 82137 3 6000 706 010 COVER FRONT NORYL 1005 vo BGE 2 6674 713 710 SPRING COIL 515 302 WPA PIO 5 1 7622 701 610 KkNOB POWER NORYL __ wo DESCRIPTION SPECIFICATION CODE NO 5 g a 22 REPLACEMENT PARTS LIST PRODUCT SAFETV SHOULD BE CONSIDERED WHEN A COMPONENT REPLACEMENT IS MADE IN ANV AREA OF THIS UNIT WITH A COMPONENT INDICATED BY SAFETY CRITICAL MARK THIS PARTS LIST AND THE SCHEMATIC DIAGRAM SHOW COMPONENTS WHOSE VALUE HAVE SPECIAL _ SIGNIFICANCE TO PRODUCT SAFETY IT IS PARTICULARLY RECOMMENDED THAT ONLY PARTS _ SPECIFIED ON THE FOLLOWING PARTS LIST BE USED FOR COMPONENT REPLACEMENT POINTED OUT _ BY THE SAFETY CRITICAL MARK ASSY PWB MAIN 0509 400 116 8P 3053 605 310 C201 1416 318 471 C202 1509 121 260 203 1509 121 750 204 1417 344 104 205 1609 401 720 206 1609 402 100 207 1505 724 332 208 1517 383 104 209 151
24. R AC POWER REGULATOR INPUT O PILLEN TRANSFOR e C401 402 C403 MER C 401 140 INVHOVIG SEQUENCE 1 10 11 12 13 ADJUSTMENT METHOD ITEM ADJUSTED BY SUP VR401 PLY VOLTAGE V ADJST H HOLD VR301 H HOLD H LINEARITY 1302 H LIN H WIDTH L303 V HOLD VR201 V LINEARITY IVR205 V SIZE 1 VA202 V SIZE1 2 VR203 V SIZE2 3 VR204 V SIZE3 CENTERING JCENTERING MAGNET OF DEFLECTION YOKE TILT DEFLECTION VOKE GEOMETRIC G D COMPENSAT ION MAGNET BRIGHTNESS VR503 SUB BRT CONTRAST VR101 SUB CONT FOCUS VR501 GOAL 24 0 2V Adjust screen at horizontal center position of raster A same character size of horizontal axis Refer to the page 4 Vertical free run ning Frequency 54 2 2 same character size of Vertical axis Refer to the page 4 MODE3 same sequence 7 1 MODE2 A same sequence 7 1 MODE1 Adjust screen at central point Turn the DY in order to adjust within 1 deg of tilt Adjust G D by mag net in order to enter within overlay jig Adjust VR503 in order to instantly disappear the back raster Adjust VR101 in order to make brightness to 40 5F L VR501 in FOCUS 11 ADJ CONDITION REMARKS FULL CROSS HATCH PATTERN or FULL H PATTERN MODE et FULL WHITE PATTERN and bringhtness 30F L Next change to CROSS HATCH PATTERN No signal
25. SERVICE MANUAL VGA MONO MONITOR CONTENTS SPECIFICATIONS ii e ad ae 2 IMPORTANT SERVICE SAFETY IMPORMATION A 3 4 THEORY OPERATION 5 6 MAJOR OPERATING COMPONENTS 7 8 DISASSEMBLY INSTRUCTION 9 BLOCK DIAGRAM nee 10 ADJUSTMENT METHOD 11 ALIGNMENT INSTRUCTIONS 12 5 5250 db id 13 16 PRINTED CIRCUIT BOARD FEE 17 18 WIRING DIAGRAM aged ERE deo Ge a 19 EXPLODED VIEW NN 20 23 REPLACEMENT PARTS LIST AM 24 32 SEMICONDUCTOR IDENTIFICATION P m 33 WAVEFORMS ER ER 33 SCHEMATIC DIAGRAM bodega 34 35 CIRCUIT DIAGRAM DISPLAY SYMBOLS 86 RMS MEASUREMENT RESULTS OF THE IC S ee eee 36 SPECIFICATION 1 Monitor Descriptions This CRT displav monitor is operates in a separate drive mode input and is compatible with IBM PS 2 2 Displav Monitor Electrical Characteristics e AC power input Power supply 1
26. ate the display monitor longer than is necessary to locate the cause of excessive voitage BEFORE RETURNING THE DISPLAY MONITOR Fire and Shock Hazard Before returning the display monitor to the user per form the following safety checks 1 Inspect all lead dress to make certain that the leads are not pinched or that hardware is not lodged between the chassis and other metal parts in the display monitor 2 Inspect all protective devices such as metallic control knobs insulating materials cabinet backs adjustment and compartment covers or shields isolation resistor capacitor net works mechanical insulators etc 3 To be sure that no shock hazard exists checks for leakage current in the following manner Plug the AC line cord directly into a 120volt AC outlet Do not use an isolation transformer for this test e Using two clips leads connect 1 5 kohm 10 watt resistor paralleled by a 1 5uF capacitor in series with all exposed metal cabinet parts and a known earth ground such as electrical conduit electrical ground connected to earth ground e Use a SSVM or VOM with 1000 ohms per volt or higher sensitivity to measure the AC voltage drop across the resistor See Figure 1 Connect the resistor to all exposed metal parts having a return path to the chassis metal cabinet screw heads knobs and shafts escutcheon etc and measure the AC voltage drop across the resistor Any reading of 0 3volt RMS this
27. n 13 H sync Pin 6 no pin Pin 14 V sync Pin 7 video return Pin 15 no pin Pin 8 no pin 3 Mechanical Characteristics MODEL Dimensions Weight Remarks WxHxD MM Kg IMPORTANT SERVICE SAFETV IMPORMATION Service work should be performed only by qualified service technicians who are thoroughly familiar with all of the following safetv checks and servicing guidelines WARNING 1 For continued safety do not attempt to modify the circuit 2 Disconnect the AC power before servicing 3 Semiconductor heat sinks are potential shock hazards when the chassis is operating SERVICING THE HIGH VOLTAGE SYSTEM AND PICTURE TUBE When servicing the high voltage system remove the Static charge by connecting a 10kohm resistor in series with an insulated wire such as a test probe between the chassis and the anode lead The AC line cord should be disconnected from the AC outlet 1 The picture tube in this display monitor employs integral implosion protection 2 Replace with a tube of the same type and number for continued safety 3 Do not lift the picture tube by the neck 4 Handle the picture tube only when wearing shat ter proof goggles and after discharging the high voltage anode completely X RADIATION AND HIGH VOLTAGE LIMITS 1 Be sure all service personnel are aware of the procedures and instructions covering X radia tion The only potential source of X ray in a current solidstate display moni
28. tor is the tube However the picture tube does not emit measurable X ray radiation if the high voltage is as specified in the high voltage check instruc tion It is only when high voltage is excessive that X radiation is capable of penetrating the shell of the picture tube including the lead in glass material The important precaution is to keep the high voltage below the maximum level specified 2 lt is essential that serviceman have available at all times an accurate high voltage meter The calibration of this meter should be checked periodically 8 High voltage should always be kept at the rated value no higher Operation at high voltages may cause a failure of the picture tube or high voltage circuitry and also under certain condi tions may produce radiation in excess of desirable levels 4 When the high voltage regulator is operating properly there is no possibility of an X radiation problem Everytime a color chassis is serviced the bright ness should be tested while monitoring the high voltage with a meter to be certain that the high voltage does not exceed the specified value and that it is regulating correctly 5 Do not use a picture tube other than that specified or make unrecommended circuit modifications to the high voltage circuitry 6 When troubleshooting taking test measurements on a display monitor with excessively high volt age avoid being unnecessarily close to the display monitor Do not oper
29. y ad justing L303 The high voltage of 12 5KV for CRT anode is also generated in the flyback transformer by use of the flyback pulse 1 4 Vertical processor IC 201 IC201 performs following functions Vertical oscillator Ramp generator Linearity control Output amplifier There are three vertical size controls VR202 VR203 and VR204 VR202 is for mode 3 VR203 for mode 2 and VR204 for mode 1 Each mode is automatically selected by IC301 1 5 Dynamic Focus Q501 is used to provide dynamic focus voltage which is added to G4 voltage of the CRT This voltage is needed to change G4 voltage according to the angle of the beam CRT Board IC101 M51392P contains wide bandwidth video amplifier gain control pedestal clamp and bright ness control circuit Q103 and Q104 from a cascade video amplifier circuit of which its output is applied to the cathode pin of the CRT 3 Line Filter Board This board contains fuse and EMI filter com ponents IMPORTANT When replacing the power supplv make sure that the black ground wire is properiv attached to the main chassis frame When replacing the fuse make sure that the fuse is of the same tvpe and rating as the original The adjustment requires the connection of a per sonal computer to the monitor Although the monitor is adjusted before it is delivered readjust ment mav be required when the setting position is changed or when a component is
30. y means of a variable duty cycle The output voltage of this power supply is fed back into the pin 2 of L4960 This voltage is compared to reference voltage in ternally The difference of these voltages control the duty cycle of output current D401 to D404 and C404 to C405 from input DC supplier C408 C409 R404 are the components for fre quency compensation R403 C406 are for oscilla tion of sawtooth wave C407 is for soft start of this circuit D405 is a flywheel diode for continuous flowing current Output voltage is varied by adjust ing VR401 potentiometer 1 2 Horizontal processor IC302 IC302 performs following functions Horizontal oscillator Phase locked loop for frequency and phase comparison Phase ocked loop to compensate various delay times of the horizontal output transistor The sync signal from Q303 is fed into pin 3 of IC302 and flyback pulse into pin 4 These two signals are compared and the circuit is locked to a correct frequency and phase 1 3 Horizontal output stage Q305 Q305 is a horizontal output switch which is closed during the scan period and opened during the flyback It sinks a driver signal from IC302 through Q304 The flyback period is determined by the resonance of C316 and deflection yoke C316 makes the necessary S correction Because of the losses in the deflection yoke a linearity correction is required This is achieved by L302 The horizontal screen size can be varied b

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