HP D8911A Service Manual
  1. Manuals
  2. Brands
  3. HP Manuals
  4. Monitor
  5. D8911A
  6. Service manual
HP D8911A Service Manual

HP D8911A Service Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual

SERVICE MANUAL


COLOR MONITOR
HP D8911A


Advertisement

Table of Contents
loading

Related Manuals for HP D8911A

Summary of Contents for HP D8911A

  • Page 1: Service Manual

    SERVICE MANUAL COLOR MONITOR HP D8911A...

  • Page 2: Table Of Contents

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

  • Page 3: Specifications

    1. SPECIFICATIONS FOR C993 SERIES COLOR MONITOR CRT : 48.2CM(19") 90 Deflection, 29mm Neck, 0.26mm Dot Pitch, Non-Glare Screen Viewable image Size: 45.7CM (18") diagonal Display Color: Unlimited Colors External Controls: Power On/Off, OSD key, Function knob: Contrast, Brightness, H-Size, H-Center, V-Size, V-Center, ZOOM, Pincushion, Trapezoid, Pin-Balance, Parallelogram, Rotation, Moire Reduce, Recall, Degaussing, Color Temperature.
  • 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 Weight: 20.0 Kgs(Net), 23.8Kgs(Gross) • Dimensions Monitor: Carton: 574(W) × 537(H) × 594(D) mm 460(W) ×...

  • Page 5: Precaution And Notices

    2. PRECAUTIONS AND NOTICES SAFETY PRECAUTIONS 1. 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. Exercise care when servicing this chassis with power applied.

  • Page 7: Operating Instructions

    3. OPERATING INSTRUCTIONS This procedure gives you instructions for installing and using the C993 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 FACTORY PRESET H: 36.51kHz V: 51.34Hz 6500 9300 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 TOP COMER R-BIAS BOTTOM COMER COLOR TEMPERATURE 9300 PINCUSHION 6500 COLOR TEMPERATURE TRAPEZOID DEGAUSS PIN-BALANCE OSD EXIT PARALLELOGRAM RETURN ROTATION...
  • Page 10 G. The setting data of the CONTRAST, BRIGHTNESS, PIN-BALANCE, PARALLELOGRAM, ROTATION, COLOR TEMPERATURE are common mode saved in the memory. Don't needed adjust it individual at every timing Mode and save in the memory. Model select: for factory only, service engineer can't changed. 3.

  • Page 11: Circuit Description

    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 On Screen Display Controller The IC103 is designed for display the built-in characters or fonts onto monitor screen. The display operation is by transforming data and control information from micro controller to RAM through a serial data interface. Pin2 is used to control the internal oscillator frequency by DC voltage input from external low pass filter (R125, C114, R161) and filter (R126, C115) is used to regulate the appropriate bias current for internal oscillator the resonate at specific dot frequency.
  • Page 13 5-3 TRANSISTOR & DIODE CIRCUIT LOCATION FUNCTION AL DESCRIPTION D101 For C102 Discharge Q101 For LED Indicator Control D418 Protection Diode for Snubber Clip Diode ZD401 D431 Protection Diode for B+ Control D405, D424 Speed up for Q403 D406, D407 Supply a bias for D408 D408 Damping Diode and Modulation Diode...
  • Page 14 LOCATION FUNCTION AL DESCRIPTION D706,D708 Rectifier for -200V Supply Q707 Picture Mute Control AMP Q703, Q706 Brightness Control CKT Q708 Vertical Dynamic Focus Control AMP D901 ~ D904 Bridge Rectifier for AC Source D909 Rectifier for Start Power Supply D910 Clip Diode for Snubber CKT D911 IC901 VCC Supply...

  • Page 15: Trouble Shooting Chart

    6.TROUBLE SHOOTING CHART 6-1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS CHECK MAIN PCB POWER SUPPLY 60.5V, 14.5V, 80V CHECK POWER SAVING CIRCUIT, H-SYNC, V-SYNC SIGNAL CHECK THE HIGE VOLTAGE REFER ITEM S.M.P.S. OF CRT ABOUT 25.5 ~ 26.5KV CHECK FAILSAFE CKT IC401 PIN 2 RELATIVE CKT.
  • Page 16 2.ABNORMAL VIDEO LEVEL ON SCREEN CHECK THE VOLTAGE OF IC801 PIN 6, 9, 22 ABOUT 12V CHECK 12V RELATIVE CIRCUIT CHECK THE SIGNAL INPUT OF R.G.B. ABOUT 0.7Vpp CHECK SIGNAL CABLE OR INTERFACE CARD. CHECK IC801 PIN 15 CLAMP PULSE PIN 16 BLANK PULSE CHECK THE IC105 RELATIVE CIRCUIT OR IC401 PIN 16 OUTPUT...

  • Page 17: Abnormal Display

    6-2 ABNORMAL DISPLAY 1.NO SIGNAL ON SCREEN CHECK VIDEO IC801 VCC ABOUT 12V CHECK THE 12V PIN OF P802 CONNECTOR CHECK THE OUTPUT VOLTAGE OF IC801 PIN 18, 20, 23 ABOUT 3Vpp CHECK THE RELATIVE CIRCUIT OF IC801 CHECK THE B+ VOLTAGE OF VIDEO PCB ABOUT 80V CHECK THE 80V RELATIVE CIRCUIT OF SMPS ON MAIN PCB...

  • Page 18: No Blanking

    6-3 NO BLANKING CHECK THE RELATIVE CIRCUIT OF BLANKING CHECK THE RELATIVE CIRCUIT OF C433, D410, R635, R636, IC105 ON MAIN PCB CHECK IC801 PIN 16 ON VIDEO PCB, CHECK G1 RELATIVE CIRCUIT Q705, R718, C707 ON MAIN PCB 6-4 HOR./OSC/DEF/HV CIRCUIT FAULT 1.

  • 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 60.5V AT FH=31KHz CHECK THE RELATIVE CIRCUIT OF SMPS. Q911, Q912, Q914, Q915 & IC401 PIN 4, 5, 6, VR 902 CHECK THE HV OF CRT ABOUT 26KV...

  • Page 20: Abnormal Vertical Scanning

    6-6 ABNORMAL VERTICAL SCANNING 1. ABNORMAL VERTICAL SIZE READJUST V-SIZE FUNCTION VALUE CHECK THE IC601 PIN 7 ABOUT 40V CHECK ZD601, ZD602 R626 & SMPS RELATIVE CIRCUIT CHECK VERT. OSC CIRCUIT CHECK IC401 PIN 22, 23, 24 CHECK IC601 PIN 6 OUTPUT ABOUT CHECK IC401 PIN 12, 13 38Vpp RELATIVE CIRCUIT...

  • Page 21: Poor Focus

    6-8 POOR FOCUS READJUST FOCUS CONTROL CHECK FOCUS CONTROL UNIT, FOCUS LEAD WIRE, CRT SOCKET & CRT 6-9 NO SOUND (FOR AUDIO MODEL ONLY) CHECK IC501 ADJUST VOLUME CONTROL PIN 14 ABOUT 14V CHECK POWER SUPPLY CIRCUIT ENSURE THE SOUND SOURCE IS POWER ON CHECK IC501 IC501 FAILURE...

  • Page 22: Power Supply Trouble Shooting Chart

    6-10 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, 55V, 80V BEAD SET ABNORMAL VARIABLE OUTPUT MAKE SURE THAT CHECK AC LINE...

  • Page 24: Parts List Of Cabinet

    PARTS LIST OF CABINET LOCATION C993 SPECIFICATION (LOW RADIATION 220V) C995TSE CHAS ASS'Y 503- SCREW RUBBER WASHER 112- WIRE MOUNT 115- F.B.T CLIP 381- RUBBER FOOT 403- STEEL 506- STEEL WIRE SPRING 33A 3663- SUPPORT 33A 3726- POWER CAP 33A 3727- POWER ROD 33A 3790- POWER LED LENS...
  • Page 25 PARTS LIST OF CHAS LOCATION C993 SPECIFICATION AI995TSE MAIN BOARD ASS'Y CR995TSE CRT BOARD ASS'Y 421- SCREW 202- STAINLESS STEEL CLIP LOCK WASHER BRASS 203- BRASS PIN NYLON 127- PC SUPPORT 15A 5640- AL GND LUG 15A 5659- 500 - REAR BRACKET 581- 26 -...
  • Page 26 LOCATION C993 SPECIFICATION C902 107- 224 - 0.22Uf +-20% 250VAC C915 103 - 0.01Uf+-20% Z5U 2KV C922 65A 517K- 103 - 10000PF Z5F 500V C931 305- 101 - 100Uf +-20% 160V C934 215- 391 - 390Uf +-20% 80V C936 215- 102 - 1000Uf +-20% 25V C937...
  • Page 27 LOCATION C993 SPECIFICATION Q418 610- IRF640A Q908 690- PNP TRANSISTOR BD140 Q909 728- 2SB772 R426 61A 155M- 220 - 22 OHM +-5% 5W R428 61A 155M- 758 - 0.75 OHM +-5% 5W R456 61A 153M- 181 - 180 OHM +-5% 3W R469 208- 220 -...
  • Page 28 LOCATION C993 SPECIFICATION C120 309- 100 - 10uF +-20% 50V C121 309- 100 - 10uF +-20% 50V C122 309- 100 - 10uF +-20% 50V C123 309- 100 - 10uF +-20% 50V C124 309- 100 - 10uF +-20% 50V C125 309- 100 - 10uF +-20% 50V C126...
  • Page 29 LOCATION C993 SPECIFICATION C719 67A 215K- 828 - 0.82uF 100V C905 305- 229 - 2.2uF +-20% 50V C906 444- 681 - 680PF 10% 50V C914 305- 100 - 10uF +-20% 50V C916 305- 101 - 100uF +-20% 25V C918 64A 700J- 332 - 3.3uF +-5% 50V C919...
  • Page 30 LOCATION C993 SPECIFICATION D707 11 - DIODE IN4148 D708 93A 1060- BYV26C D905 31G - BAV20 D909 1P - IN4005 D910 93A 1060- F.R.D BYV26C D911 31G - BAV20 D912 31G - BAV20 D913 11 - DIODE IN4148 D914 11 - DIODE IN4148 D919 93A 1060-...
  • Page 31 LOCATION C993 SPECIFICATION J052 TIN COATED J053 TIN COATED J054 TIN COATED J055 TIN COATED J056 TIN COATED J057 TIN COATED J058 TIN COATED J059 TIN COATED J060 TIN COATED J061 TIN COATED J062 TIN COATED J063 TIN COATED J064 TIN COATED J065 TIN COATED...
  • Page 32 LOCATION C993 SPECIFICATION J115 TIN COATED J116 TIN COATED J117 TIN COATED J118 TIN COATED J119 TIN COATED J120 19 - BEAD J121 TIN COATED J122 TIN COATED J123 TIN COATED J124 TIN COATED J125 19 - BEAD J126 TIN COATED J127 TIN COATED J128...
  • Page 33 LOCATION C993 SPECIFICATION Q419 721- DTC114ES ROHM Q424 419- TR. 2SC945P/NEC Q426 419- TR. 2SC945P/NEC Q427 721- DTC114ES ROHM Q701 419- TR. 2SC945P/NEC Q702 420- TR. 2SA733P/NEC Q703 420- TR. 2SA733P/NEC Q704 419- TR. 2SC945P/NEC Q705 419- TR. 2SC945P/NEC Q706 498- TR.
  • Page 34 LOCATION C993 SPECIFICATION R167 602- 105 - 1M OHM +-5% 1/6W R178 602- 101 - 100 OHM +-5% 1/6W R179 602- 101 - 100 OHM +-5% 1/6W R180 602- 101 - 100 OHM +-5% 1/6W R181 602- 101 - 100 OHM +-5% 1/6W R186 602- 103 -...
  • Page 35 LOCATION C993 SPECIFICATION R466 602- 104 - 100K OHM +-5% 1/6W R467 61A 175L- 681 - 680 OHM +-5% 1/2W R468 400- 47 - 2.87K OHM +-1% 1/4W R470 602- 222 - 2.2K OHM +-5% 1/6W R471 602- 222 - 2.2K OHM +-5% 1/6W R472 172-...
  • Page 36 LOCATION C993 SPECIFICATION R741 602- 103 - 10K OHM +-5% 1/6W R742 61A 175L- 154 - 150K OHM +-5% 1/2W R744 602- 102 - 1K OHM +-5% 1/6W R900 61A 175L- 106 - 10M OHM +-5% 1/2W R901 61A 175L- 474 - 470K OHM +-5% 1/2W R902...
  • Page 37 PARTS LIST OF CRT PC BOARD LOCATION C993 SPECIFICATION RAI995TSE CRT BOARD ASS’Y 581- 26 - LABEL 705A 995T R57 - Q802/Q803/Q804 ASS’Y 705A 995T R87 - CRT SOCKET ASS ‘Y C8010 444- 101 - 100PF 10% 50V C810 305- 470 - 47Uf 20% 100V C853...
  • Page 38 LOCATION C993 SPECIFICATION C825 450- 473 - 47000PF +80% -20% Z5V 50V C826 450- 473 - 47000PF +80% -20% Z5V 50V C827 450- 473 - 47000PF +80% -20% Z5V 50V C828 64A 176J- 104 - 0.1uF +-5% 100V C829 64A 176J- 104 - 0.1uF +-5% 100V C830...
  • Page 39 LOCATION C993 SPECIFICATION FB801 SHIELD BEAD FB802 SHIELD BEAD FB803 SHIELD BEAD FB804 SHIELD BEAD FB805 602- 560 - 56 OHM +-5% 1/6W FB806 602- 560 - 56 OHM +-5% 1/6W FB807 602- 560 - 56 OHM +-5% 1/6W FB808 SHIELD BEAD FB809 SHIELD BEAD...
  • Page 40 LOCATION C993 SPECIFICATION R815 602- 102 - 1K OHM +-5% 1/6W R816 602- 102 - 1K OHM +-5% 1/6W R817 602- 393 - 39K OHM +-5% 1/6W R818 602- 101 - 100 OHM +-5% 1/6W R819 602- 102 - 1K OHM +-5% 1/6W R820 602- 102 -...
  • Page 41 PARTS LIST OF Q802/Q803/Q804 ASS'Y LOCATION PARTS SPECIFICATION 32A 3028- MICA 361- HEAT SINK M1A 1730- 10 - SCREW Q802 509- TR. 2SC3953E Q803 509- TR. 2SC3953E Q804 509- TR. 2SC3953E PARTS LIST OF CRT SOCKET ASS'Y LOCATION PARTS SPECIFICATION 87A 3504- 17"...
  • Page 42 PARTS LIST OF Q425 ASS'Y LOCATION PARTS SPECIFICATION 32A 3028- MICA 360- HEAT SINK M1A 1730- SCREW Q425 728- HSB772P/HSB772E PARTS LIST OF Q420 ASS'Y LOCATION PARTS SPECIFICATION 2A 6003- SCREW NUT 90A 6015- HEAT SINK M1A 1730- SCREW Q420 600- MOS FET IRF630 PARTS LIST OF Q403/Q405/Q911/D408 ASS'Y...
  • Page 43 PARTS LIST CRT ALTERNATION LOCATION PARTS SPECIFICATION 750A 5455- M46QCG903*21(A)19” LG 500- CABLE TIE 52A 6000- COPPER FOIL ALUMINUM FOIL C498 151 - 1KV 150PF 95A 201F- 50 - WIRE ASS’Y TP498 95A 201M- 50 - WIRE ASS’Y PARTS LIST CRT ALTERNATION LOCATION PARTS SPECIFICATION...
  • Page 46 IC401 TDA4856/41...

  • Page 51: Schematic Diagram

    11-2 CRT BOARD LAYOUT 11-3 KEY BOARD LAYOUT...

Table of Contents