AOC Spectrum 7V Series Service Manual
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AOC Spectrum 7V Series Service Manual

AOC Spectrum 7V Series Service Manual

Color monitor spectrum 7v series
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SERVICE MANUAL

COLOR MONITOR

SPECTRUM 7V SERIES
(S761U/V)
41AS761-E11

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Summary of Contents for AOC Spectrum 7V Series

  • Page 1: Service Manual

    SERVICE MANUAL COLOR MONITOR SPECTRUM 7V SERIES (S761U/V) 41AS761-E11...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS PAGE 1. SPECIFICATIONS ..................... 2. PRECAUTION AND NOTICES ................2-1 SAFETY PRECAUTIONS ................2-2 PRODUCT SAFETY NOTICE ............... 2-3 SERVICE NOTES ................... 2-4 HIGH VOLTAGE WARNING ............... 3. OPERATING INSTRUCTIONS ................4. ADJUSTMENT ......................4-1 ADJUSTMENT CONDITIONS AND PRECAUTIONS ....... 4-2 MAIN ADJUSTMENTS .................

  • Page 3: Specifications

    1. SPECIFICATIONS FOR 7V SERIES COLOR MONITOR CRT : 43.2CM(17") 90 Deflection, 29mm Neck, 0.27mm Dot Pitch, Non-Glare Screen Viewable image Size: 40.6CM (16") diagonal Display Color: Unlimited Colors External Controls: Power On/Off, OSD key, Function knob: Contrast, Brightness, H-Size, H-Center, V-Center, V-Size, ZOOM, Pincushion, Trapezoid, Pin-Balance, Parallelogram, Rotation, Color Temperature, Degaussing, Moire Reduce, Recall, Language.
  • Page 4 11. Power Source: Switching Mode Power Supply AC 100 ~240V, 50/60Hz Universal Type 12. Operating Temperature: 0°C to 40°C Ambient 13. Humidity: 10% to 85% Relative, Non-Condensing 14. Weight: 15.5 Kgs(Net), 17.5Kgs(Gross) 15. Dimensions Monitor: Carton: 495(W) × 455(H) × 525(D) mm Monitor: 410(W) ×...

  • Page 5: Precaution And Notices

    2. PRECAUTIONS AND NOTICES SAFETY PRECAUTIONS Observe all caution and safety related notes located inside the display cabinet. Operation of the display with the cover removed, may cause a serious shock hazard from the display power supply. Work on the display should not be attempted by anyone who is not thoroughly familiar with precautions necessary when working on high voltage equipment.

  • Page 6: High Voltage Warning

    HIGH VOLTAGE WARNING Operation of monitor outside of cabinet or with back removed may cause a serious shock hazard. Work on this model should only be performed by those who are thoroughly familiar with precautions necessary when working on high voltage equipment.

  • Page 7: Operating Instructions

    3. OPERATING INSTRUCTIONS This procedure gives you instructions for installing and using the Color display. Position the display on the desired operation and plug the power cord into a convenient AC outlet. Three-wire power cord must be shielded and is provided as a safety precaution as it connects the chassis and cabinet to the electrical conduit ground.

  • Page 8: Adjustment

    4. ADJUSTMENT 4-1 ADJUSTMENT CONDITIONS AND PRECAUTIONS Approximately 30 minutes should be allowed for warm up before proceeding. Adjustments should be undertaken only on those necessary elements since most of them have been carefully preset at the factory. 4-2 MAIN ADJUSTMENTS FUNCTION LOCATION DESIGNATION...
  • Page 9 H:31.4KHZ V:59.8HZ Factory Preset 9300 6500 CONTRAST H-MOIRE REDUCE BRIGHTNESS V-MOIRE REDUCE H-CENTER R-GAIN H-SIZE G-GAIN V-CENTER B-GAIN V-SIZE R-BIAS ZOOM G-BIAS PINCUSHION R-BIAS TRAPEZOID 9300 COLOR TEMPERATURE PIN-BALANCE COLOR TEMPERATURE 6500 PARALLELOGRAM DEGAUSS ROTATION OSD EXIT CORNER RETURN...
  • Page 10 D. To switches the input signal to the other Timing Mode. Please follow step A ~ C to get the optimum picture. E. Select the " " RETURN function and press the MENU Key, then the Factor Preset window will be returned to the original OSD window.(user's operating condition) F.
  • Page 11 RELATIVE PLACEMENT OF TYPICAL COMPONENTS Purity Magnets 6-pole Convergence Magnets 4-pole Convergence Magnets Deflection Yoke 6. Convergence adjustment A. Produce a magenta crosshatch on the display. B. Adjust the focus for the best overall focus on the display. Also adjust the brightness to the desired condition. C.

  • Page 12: Circuit Description

    5. CIRCUIT DESCRIPTION 5-1 MICRO CONTROLLER CIRCUIT MICRO Controller The IC101 contains a 6502 8-bit CPU core, 512 bytes of RAM, 16K bytes of ROM,14 channel 8 bit PWM D/A converters, 2 channel A/D converters for key detection, one 8 bit pre-loadable base timer, internal H-sync and V-sync signals processor providing mode detection, watch- dog timer preventing system from abnormal operation, and an I²C bus interface.

  • Page 13: Deflection Circuit

    DEFLECTION CIRCUIT The deflection circuit is achieved by a high performance and efficient solution IC 401 (TDA9111) for this monitor. The concept is fully DC controllable and can be used in applications with a micro-controller solutions. The TDA9111 provides sync. Processing with full auto sync. Capability, a flexible SMPS block and an extensive set of geometry control facilities.

  • Page 14: Transistor & Diode Circuit

    5-3 TRANSISTOR & DIODE CIRCUIT LOCATION CIRCUIT FUNCTION DESCRIPTION D901 ~ D904 Bridge Rectifier for AC Source D910 Clamp Diode for Snubber CKT D918, D919 Rectifier for Output Voltage D922 Rectifier for Output Voltage D923 Rectifier for Output Voltage D925 Rectifier for B+ Supply D929 B+ Feed Back Rectifier from F.B.T Pulse...

  • Page 15: Trouble Shooting Chart

    6.TROUBLE SHOOTING CHART 6-1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS CHECK MAIN PCB POWER SUPPLY 53V, 14V, 78V CHECK POWER SAVING CIRCUIT, H-SYNC, V-SYNC SIGNAL Q909, Q910 CHECK THE HIGE VOLTAGE OF CRT ABOUT 24.5+-1.0KV CHECK THE HIGE VOLTAGE REFER ITEM S.M.P.S. OF CRT ABOUT 24.5 ~ 25.5KV CHECK FAILSAFE CKT IC401 PIN 25 RELATIVE CKT.
  • Page 16 2.ABNORMAL VIDEO LEVEL ON SCREEN CHECK THE VOLTAGE OF IC801 PIN 2, 16 ABOUT 8V CHECK 8V RELATIVE CIRCUIT CHECK THE SIGNAL INPUT OF R.G.B. ABOUT 0.7Vpp CHECK SIGNAL CABLE OR INTERFACE CARD. CHECK IC801 PIN 11 CLAMP PULSE CHECK THE IC801 PIN 11 RELATIVE CIRCUIT CHECK THE VIDEO OUTPUT OF IC801 PIN 13, 15, 18 ABOUT 4Vpp,...

  • Page 17: Abnormal Display

    6-2 ABNORMAL DISPLAY 1.NO SIGNAL ON SCREEN CHECK VIDEO IC801 VCC ABOUT 8V CHECK THE 12V PIN OF P802 CONNECTOR CHECK THE OUTPUT VOLTAGE OF IC801 PIN 13, 15, 18 ABOUT 3Vpp CHECK THE RELATIVE CIRCUIT OF IC801 PIN 2/PIN 16 Vcc CIRCUIT CHECK THE B+ VOLTAGE OF VIDEO PCB ABOUT 78V CHECK THE 78V RELATIVE CIRCUIT...

  • Page 18: No Blanking

    6-3 NO BLANKING CHECK THE RELATIVE CIRCUIT OF BLANKING CHECK THE RELATIVE CIRCUIT OF Q705, Q708 CHECK THE RELATIVE CIRCUIT OF Q601, Q707 CHECK R858 ON VIDEO PCB, CHECK G1 CHECK R859 ON VIDEO PCB, RELATIVE CIRCUIT FBT PIN 5 ON MAIN CHECK G1 RELATIVE CIRCUIT PCB.

  • Page 19: Abnormal Horizontal Deflection

    6-5 ABNORMAL HORIZONTAL DEFLECTION 1. ABNORMAL HORIZONTAL WIDTH OF VIDEO READJUST H-WIDTH FUNCTION CHECK THE RELATIVE CIRCUIT OF Q404, Q405, & Q406 CHECK FBT B+ VOLTAGE ABOUT 60V AT FH=31KHz CHECK THE RELATIVE CIRCUIT OF SMPS. CHECK THE HV OF CRT ABOUT CHECK THE HV OF 24.5KV CRT ABOUT 25KV...

  • Page 20: Abnormal Vertical Scanning

    6-6 ABNORMAL VERTICAL SCANNING 1. ABNORMAL VERTICAL SIZE READJUST V-SIZE FUNCTION VALUE CHECK THE IC601 PIN 2 ABOUT 11.8V PIN 4 ABOUT -12V CHECK D601, C605 RELATIVE CIRCUIT CHECK VERT. OSC CIRCUIT CHECK THE VOLTAGE OF IC101 RELATIVE CIRCUIT READJUST V-SIZE FUNCTION VALUE CHECK IC401 PIN 20, 21, 22, 23 RELATIVE CIRCUIT 2.

  • Page 21: Power Supply Trouble Shooting Chart

    6-9 POWER SUPPLY TROUBLE SHOOTING CHART BEFORE CHECK SW.REG. PLEASE REFER TO THE POWER SUPPLY BLOCK DIAGRAM POWER SUPPLY OUTPUT: (A) VARIABLE OUTPUT : 60.5V - 145V (DEPENDING EPENDING UPON H.SYNC FREQUENCY) CONSTANT OUTPUT : 6.3V, 14.5V, -12V, 80V BEAD SET ABNORMAL VARIABLE OUTPUT MAKE SURE THAT CHECK AC LINE...

  • Page 23: Parts Listing

    8. PARTS LIST OF CABINET LOCATION S761U SPECIFICATION (LOW RADIATION 220V) CMS761U2N CHAS ASS'Y CK761U2N KEPC BOARD 1A 503- 5T- 47 SCREW FOR CRT 5A 38- 8 RUBBER WASHER 11A 112- 1 WIRE MOUNTS 11A 112-500 WIRE MOUNT 11A 115- 1 FBT CLIP 19A 403- 7 STEEL...
  • Page 24 LOCATION PARTS No. SPECIFICATION 715A 757- 1 P.C.BRD E601 77A 700- 1- F ENCODER H601 95A8013- 4- 16 HARNESS 4P-4P 230MM R191 61A 602-202-52T CFR 2K OHM+-5% 1/6W PARTS LIST OF CHAS LOCATION CMS761U2N SPECIFICATION AMS761U MAIN PC BOARD ASS'Y CRS761U CRT BOARD ASS'Y...
  • Page 25 LOCATION CMS761U2N SPECIFICATION...
  • Page 26 LOCATION CMS761U2N SPECIFICATION LOCATION CMS761U2N SPECIFICATION...
  • Page 27 PARTS LIST OF MAIN PC BOARD LOCATION AMS761U SPECIFICATION LOCATION AMS761U SPECIFICATION...
  • Page 29 LOCATION AMS761U SPECIFICATION LOCATION AMS761U SPECIFICATION...
  • Page 30 LOCATION AMS761U SPECIFICATION...
  • Page 31 LOCATION AMS761U SPECIFICATION...
  • Page 32 LOCATION AMS761U SPECIFICATION...
  • Page 34 LOCATION AMS761U SPECIFICATION...
  • Page 35 LOCATION AMS761U SPECIFICATION LOCATION AMS761U SPECIFICATION...
  • Page 36 LOCATION AMS761U SPECIFICATION...
  • Page 37 LOCATION AMS761U SPECIFICATION...
  • Page 39 LOCATION AMS761U SPECIFICATION PARTS LIST OF CRT PC BOARD LOCATION CRS761U SPECIFICATION ARS761U CRT BOARD...
  • Page 40 PARTS LIST OF CRT AUTO INS. PC BOARD LOCATION ARS761U SPECIFICATION LOCATION ARS761U SPECIFICATION...
  • Page 42 LOCATION ARS761U SPECIFICATION...

  • Page 43: Ic Block Diagrams

    LOCATION ARS761U SPECIFICATION PARTS LIST OF IC802 ASS'Y LOCATION PARTS No. SPECIFICATION PARTS LIST OF IC601 ASS'Y LOCATION PARTS No. SPECIFICATION...
  • Page 44 PARTS LIST OF IC101 ASS'Y LOCATION PARTS No. SPECIFICATION PARTS LIST OF IC101 ASS'Y LOCATION PARTS No. SPECIFICATION PARTS LIST OF Q403/Q406/D408 ASS'Y LOCATION PARTS No. SPECIFICATION PARTS LIST OF Q901 ASS'Y LOCATION PARTS No. SPECIFICATION PARTS LIST OF Q911 ASS'Y...
  • Page 45 LOCATION PARTS No. SPECIFICATION PARTS LIST OF NR901 ASS'Y LOCATION PARTS No. SPECIFICATION PARTS LIST OF AC SOCKET ASS'Y LOCATION PARTS No. SPECIFICATION PARTS LIST OF D919 ASS'Y LOCATION PARTS No. SPECIFICATION PARTS LIST OF Q431 ASS'Y LOCATION PARTS No. SPECIFICATION PARTS LIST OF Q428 ASS'Y...
  • Page 46 LOCATION PARTS No. SPECIFICATION PARTS LIST OF CRT ALTERNATION LOCATION PARTS No. SPECIFICATION PARTS LIST OF CRT ALTERNATION LOCATION PARTS No. SPECIFICATION...
  • Page 47 IC801 IC802 IC802 SIGNAL LM1279N LM2439 25KV CABLE LM2438 O/P PRE.AMP. FOCUS FUNCTION ON SCREEN CONTROL DISPLAY IC105 IC101 UM68P61A WT62P1 IC401 Q402,T401 Q403,T402(FBT) TDA9111 CRYSTAL 8M HOR. DRIVER HOR.O/P VERT.&HOR.OSC Q907,Q908 Q909,Q910 X-RAY PROTECTION POWER SAVING Q404,Q405,Q406 IC601 PINCUSHION & TDA9302H H-SIZE CONTROL VERT.O/P...

  • Page 48: Pcb Layout

    -12V Q909 Q921 OUTPUTS RECTIFIED Q910 T901 DEGAUSSING RECTIFIED & & C.K.T Q907 SMOOTHED 6.3V SMOOTHED 6.3V Q908 POWER TRANSFORMER R963 START Q913 RECTIFIED C.K.T R122 RY901 & LED1 Q923,R932 L906 SMOOTHED D911,D917 FROM IC101 CPU VARI. TRANSFORMER POWER Q901 IC101 CONTROL ON/OFF...
  • Page 49 IC101 IC104 UM6861/WT62P1 74LS14 DAC2 VSYNC1/INTV DAC1 HSYNC1 DAC0 DAC3 RESET_ DAC4 DAC5 DAC6 OSC0 DAC7 OSC1 P07/HSYNC0 P06/VSYNC0 [CE]P14 P05/DAC13 P13/HALFH1 P04/DAC12 P12/HALFH0 P03/DAC11 P11/AD1 P02/DAC10 P10/AD0 P01/DAC9 P16/INTE P00/DAC8 P31/SCL P30/SDA...
  • Page 51 IC105 MTV016 8 DATA DATA CCS0 DISPLAY & ROW CCS1 SERIAL DATA DAEN CONTROL BLINK INTERFACE 2 RAEN CAEN REGISTERS CRADDR VDDA LUMA VSSA CHARACTER ROM BORDER 5 RCADDR ARWDB ADDRESS BUS HDREN 9 DADDR LUMINANCE & VDREN BORDGER ADMINISTRATOR VCLKS 5 WADDR NROW...
  • Page 52 IC102 24C04 HV GENERATOR MEMORY EEPROM ARRAY CONTROL CONTROL (128X8) LOGIC LOGIC XDEC PAGE LATCHES YDEC SENSE AMP R.W CONTROL IC601 TDA9302H FLYBACK GENERATOR POWER AMPLITIER THERMAL PROTECTION IC802 LM2438 Vin 1 Vin 2 Vin 3 Vout 3 Vout 2 Vout 1...
  • Page 53 IC901 3842 SET/ Vref Vref RESET U.V.L.O. INTERNAL LOGLC BIAS 1/2 Vref C.S. COMP COMP. LATCH OSCILLATOR Ct/Rt IC801 LM1279AN RED OSD IN GREEN OSD IN BLUE OSD IN CONTRAST 12dB DRIVE ATTENUATOR ATTENUATOR RED VIDEO IN RED OUT R CLAMP CAP RED DRIVE 1.35V CONTRAST...
  • Page 55 FB815 IC802 FB ROGOBO GNDRD GDBDRBGBBB R833 J807 P804 C832 R832 D842 R831 D841 C820 R840 J808 R888 R824 R887 L810 R886 C829 C841 R855 L805 R857 SG804 R849 D809 SG805 C814 C831 C815 D814 L806 C821 C823 D808 R815 R856 D813 R817...
  • Page 56 H804B P601 CMPC--S761V-2A 10 11 P804 H802 E601 G/D B/D 715A883-XX 81A10-1 CRPC-S761V-2A R198 R199 C820 R847 715A793-1A R866 R849 R844 220K P801 220K 100V 1/4W 1/4W 1/4W R137 R192 SW602 R-BIAS Q130 R191 SW601 R886 R887 EXIT STAND R801 C812 R888 R146...
  • Page 57 H804B P601 CMPC--S761V-2A H802 E601 G/D B/D 715A883-XX 81A10-1 R199 R198 R137 R192 SW602 Q130 R191 SW601 STAND EXIT R146 C140 R134 D134 10UF C133 H-OUT SENSE V-OUT CONT C103 R771 C104 JUMPER R102 R120 R172 R119 100UF C770 R166 R132 R770 JUMPER...
  • Page 58 10 11 P804 CRPC-S761V-2A C820 R847 R849 715A793-1A R866 R844 220K P801 220K 100V 1/4W 1/4W 1/4W R-BIAS R886 R887 R801 C812 R888 Q821 C811 C813 D814 470UF Q831 R831 57A493-500-T BAV20 BF423 BF422 R891 IC801 C831 R867 R802 C870 LM1279AN 1000 100V...
  • Page 59 T901 80A761-1-L D918 R912 L903 93A2040 95A90-23 C907 D912 93A64-11H-52T 220UF UF2004 C929 D901 D904 1N4148 400V 47UF C950 93C52-55P-52T L906 Q923 FB905 73A253-117-L 1N5408 57A498-1-T RY901 R927 95A90-23 100UH CN902 C900 D902 D903 R917 R928 77A260-5-1 C915 4700 TP902 470K 0.01 D919...
  • Page 60 V-OUT D601 93A52-47P-52T D603 1N4004 93A64-11H-52T 1N4148 R747 R608 R746 C740 R741 D607 C606 D741 1/2W R740 93A64- R616 470UF R613 1/2W 450V UF2004 1/2W 11H-52T C605 1/2W 47UF 1/4W 1/4W 13.1 12.7 R612 D602 C615 D740 93A64- R601 1000 UF2004 11H-52T 1/4W...

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S761uS761v

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