MODEL:C5GS
SERIES
Low Radiation Extended VGA
PLUG & PLAY COLOUR MONITOR
SERVICE MANUAL
Page 1: ...MODEL C5GS SERIES Low Radiation Extended VGA PLUG PLAY COLOUR MONITOR SERVICE MANUAL...
Page 2: ...ions 5 4 Disassembly Instructions 7 5 General Connection Applications 9 6 Electronic Circuit Description 10 7 Adjustment 19 8 Troubleshooting Flow Chart 22 9 Block Diagram 28 10 PCB Layout 29 11 Circu...
Page 3: ...t 300 microamperes anode current For continued protection use the recommended replacement tube only and adjust the voltage so that the designated maximum rating at the anode will not be exceeded 5 Bef...
Page 4: ...se of substitute replacement parts which do not have the same safety characteristics as specified in the parts list may create shock fire X Ray radiation or other hazards 1 3 Service Notes 1 When repl...
Page 5: ...Vertical 768 Lines Non Interlaced Input Signals Video Analog 0 7 Vp p 75 ohm Positive Separate Sync TTL Level Horizontal Positive Negative Vertical Positive Negative Synchronization Horizontal 30KHz...
Page 6: ...2 18 Hz Positive Positive 8 1024 x 768 48 36 kHz 60 00 Hz Negative Negative 9 800 x 600 53 67 kHz 85 00 Hz Positive Positive Preset Timing Table II for others Mode Resolution H Freq V Freq Hs pol Vs p...
Page 7: ...the entire screen image PINCUSHION If the vertical sides of the screen image curve in or bulge out you can correct the pincushion distortion using this adjustment TRAPEZOID If the picture is wider at...
Page 8: ...en it will degauss the display 3 3 Power Switch and LED Push to power on the monitor and push again to power off The indicator LED will be green when the power switch is ON and the power cord is prope...
Page 9: ...2 3 Back Cover Removal Remove 4 screws A Fig 4 3 and B Fig 4 4 from the back cover Then remove the back cover 4 PCB Assembly Removal CAUTION When serving or replacing the CRT disconnect the anode and...
Page 10: ...the CRT grounding connector from the FBT shield d Discharge the remaining static electricity by shorting CRT anode and ground then remove the FBT anode connector f Press two clips D from left and righ...
Page 11: ...color display shield signal cable to the video adapter output on your computer then lock both screws to ensure proper grounding The connector information is as follows PIN Description 1 Red 2 Green 3...
Page 12: ...ch is determined by the timing components R822 and C813 C813 is charged to 2 8V via the 5V reference voltage at pin8 of I801and discharged to 1 2V during the discharged time interval The oscillator ge...
Page 13: ...ers into Stand By or Suspend state of power saving with either H Sync or V Sync off the voltage at pin29 of I201 is low both Q808 and Q809 are switched off to block the 16V voltage supply thereby shut...
Page 14: ...r the display is powered on the voltage at pin26 of I201 is HIGH then Q803 ON and RL01 triggered a large AC current flows through the posistor into the degaussing coil for demagnetization Meanwhile th...
Page 15: ...d the power saving function will be enable the CPU can generate a power saving signal control voltage at pin29 and pin28 of I201 Note that the Self Test Pattern will not appear once the signal cable i...
Page 16: ...positive polarity 13 HREF Horizontal Section Reference Voltage to be filtered 14 COMP B error amplifier output for frequency compensation and gain setting 15 REGIN Regulation input of B control loop...
Page 17: ...8 of I401 via R427 C475 This produces a sufficient voltage to T401 snubber network R448 C410 compensates for leakage inductance in T401 and shapes the base drive waveform The drive signal is fed to Q4...
Page 18: ...width automatically So that dynamic pincushion correction DPC and trapezoid distortion correction are achieved 6 11 Spot Killer Circuit The spot killer circuit is included in order to prevent CRT fro...
Page 19: ...e fed to a comparator in I401 to generate a PWM Pulse Width Modulation control signal at pin6 of I401 this square waveform control signal is then fed to Q413 via buffer Q412 Q413 is designed as a step...
Page 20: ...ontrast control voltage from R584 is applied to pin9 of I501 which varies the AC gain of all three R G B channel amplifiers simultaneously C582 added at pin9 of I501 to prevent noise entering into the...
Page 21: ...3 CRT DRIVE BOARD Component Side View PWB 0239 FOCUS SCREEN R503 R Drive R910 R Cut off R533 G Drive R940 G Cut off R563 B Drive R970 B Cut off SCREEN G2 D201 D206 Display LED s D891 Power LED R420 H...
Page 22: ...st the H Position H Width V Position and V Height to the optimized position for each mode according to the specification e Switch off the power then switch on again The monitor will revert to its norm...
Page 23: ...kground pattern to the unit b Set BRIGHTNESS control to 0 06FL c Apply a VGA signal with full white pattern to the unit d Use a photo meter to set the screen center brightness up to 20 FL by adjusting...
Page 24: ...up No voltage at C808 16V and Operation Voltage at C808 10V Yes Yes No Power start NG Check power socket copper and plug D811 D814 R804 Check Q801 I801 Check R828 R831 R856 R857 R859 Q813 D828 D808 R8...
Page 25: ...of I501 normal No Is the Yes voltage at pin 8 Yes 19 of I501 normal Are No the waveforms at cathode R G B of CRT normal No Yes No No data appear CRT is defective Check signal cable C501 C531 C561 Chec...
Page 26: ...normal Yes No Is the voltage at C409 normal Yes No Is the No Is the voltage at G1 Yes H V protection normal Circuit active Yes No No raster appear Check brightness circuit Q402 Q406 Check spot killer...
Page 27: ...4 17 20 of I501 normal Yes Is the Is the waveform at No waveform at No pin 40 of I201 KR KG KB of CRT normal normal Yes Yes Check signal cable C501 C531 C561 R G B is Missing I501 is defective CRT is...
Page 28: ...pin 1 10V and pin 4 10V Yes Is the waveform at No Are the pin39 of I201 waveforms at Yes normal pins 6 7 of I301 normal Yes No Are the waveforms Yes at pin 12 13 of I401 normal No No vertical scanning...
Page 29: ...t adjustment No 9 Horizontal Width Control Abnormal Is H size No control function working Is the voltage at No Yes the base of Q418 normal Yes H Size Abnormal Micro Control Abnormal Check R230 R231 R2...
Page 30: ...1 Q932 G Video Output Q961 Q962 B Video Output R413 R414 C407 X Ray Protection Q412 L417 D440 DC DC Converter D891 Power LED I202 EEPROM Q807 R806 D802 Q804 D825 D201 D206 Function LED 9 BLOCK DIAGRAM...
Page 31: ...301 5231322291 CAPACITOR CERAMIC 50V 2200 00PF K C303 5275133491 CAPACITOR METALLIZED 63V 0 33MF J C304 5236310491 CAPACITOR BARRIER LAYER 50V 0 10UF Z C305 5275147491 CAPACITOR METALLIZED 63V 0 47MF...
Page 32: ...C 25V 22 00UF M C480 5276110491 CAPACITOR METALLIZED 100V 0 10UF J C489 5232347191 CAPACITOR CERAMIC 500V 470 00PF K Optional C801 RA 5230105001 CAPACITOR CERAMIC 400V 4700 00PF M C801 RB 5230105501 C...
Page 33: ...02 DIODE LED CSL H410G3DTB D205 6618010702 DIODE LED CSL H410G3DTB D206 6618010702 DIODE LED CSL H410G3DTB D208 6613003032 DIODE SWITCHING HIT 1N4148 TD 75V 50MA D209 6613003032 DIODE SWITCHING HIT 1N...
Page 34: ...3002249 DIODE SWITCHING LIT PR1003G D810 6615023730 DIODE ZENER HIT HZ15 3 TD D811 6611007944 DIODE RECTIFIER PAN PG206 D812 6611007944 DIODE RECTIFIER PAN PG206 D813 6611007944 DIODE RECTIFIER PAN PG...
Page 35: ...4A 5056208101 EYELET 2 4x3 0 2 4x3 0x2 L806 5062124407 CORE CHOKE CHK 244G P401 5056407801 BASE PIN 4P 2 36MM P402 5056203901 PIN 1P RT 01N 2 3A Optional P801 5056203901 PIN 1P RT 01N 2 3A P802 505641...
Page 36: ...0 TRANSISTOR NPN HF HIT 2SC458C TZ Q813 RA 6621040700 TRANSISTOR NPN HF PHI MPSA44 Q813 RB 6621032131 TRANSISTOR NPN HF HSMC HMPSA44 SD Q815 RA 6623002050 TRANSISTOR PNP HF TSB 2SA1015Y TPE2 Q815 RB 6...
Page 37: ...CARBON FILM 1 6W 470 00 J R255 5142110395 RESISTOR CARBON FILM 1 6W 10 00K J R256 5142147195 RESISTOR CARBON FILM 1 6W 470 00 J R257 5142147195 RESISTOR CARBON FILM 1 6W 470 00 J R258 5142147195 RESIS...
Page 38: ...N FILM 1 4W 1 00M J R437 5142447090 RESISTOR CARBON FILM 1 2W 47 00 J R439 5142847995 RESISTOR CARBON FILM 1 4W 4 70 J R441 5130510103 RESISTOR METAL OXIDE FILM 3W 100 00 J R442 5130482103 RESISTOR ME...
Page 39: ...SURGE PROTECTORS GC P 10D R804 RB 5101108400 THERMISTOR SURGE PROTECTORS 10 OHM L 3A R806 5142830195 RESISTOR CARBON FILM 1 4W 300 00 J R807 5142810195 RESISTOR CARBON FILM 1 4W 100 00 J R808 5130339...
Page 40: ...ON FILM 1 6W 100 00K J R855 5142110495 RESISTOR CARBON FILM 1 6W 100 00K J R856 5142815595 RESISTOR CARBON FILM 1 4W 1 50M J R857 5142810595 RESISTOR CARBON FILM 1 4W 1 00M J R858 5142468090 RESISTOR...
Page 41: ...0091 CAPACITOR ELECTROLYTIC 50V 10 00UF M C586 5213310191 CAPACITOR ELECTROLYTIC 16V 100 00UF M C587 5236310491 CAPACITOR BARRIER LAYER 50V 0 10UF Z C902 5242212191 CAPACITOR CERAMIC 50V 120 00PF J C9...
Page 42: ...HF HIT 2SC1906 TZ Q962 RA 6621003400 TRANSISTOR NPN HF SYO 2SC3953 Q962 RB 6621006301 TRANSISTOR NPN HF HIT 2SC4934E Q980 RA 6621026430 TRANSISTOR NPN HF TSB BF422 Q980 RB 6621026434 TRANSISTOR NPN H...
Page 43: ...FILM 1 4W 120 00 J R934 5142820295 RESISTOR CARBON FILM 1 4W 2 00K J R935 5130524203 RESISTOR METAL OXIDE FILM 3W 2 40K J R936 5130524203 RESISTOR METAL OXIDE FILM 3W 2 40K J R937 5142410390 RESISTOR...
Page 44: ...0MM P402A 5057401206 WIRE ASS Y W 01P CONN UL CSA1007 L750 Optional P502A 5057415169 WIRE ASS Y W 15P CONN UL CSA1007 L310 V901 5051286270 CCRT DY CPT glare VLMF M36AJA13X46 U Optional V901 5051286273...
Page 45: ...1 M8 SPONGE 5642018215 1 M9 BACK COVER 5642283200 HP 1 M9 BACK COVER 5642283201 1 M9 BACK COVER 5642283202 RM 1 M10 FBT SHIELD PLANE 5646439300 1 M11 CLAMP SIGNAL CABLE 5648006300 1 M12 BRACKET SIGNAL...
