HP D8911A Service Manual

SERVICE MANUAL

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HP D8911A

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TABLE OF CONTENTS

PAGE

1. SPECIFICATIONS ..................................................................................................... 3-4

2. PRECAUTION AND NOTICES ................................................................................ 5

2-1 SAFETY PRECAUTIONS .............................................................................. 5

2-2 PRODUCT SAFETY NOTICE ....................................................................... 5

2-3 SERVICE NOTES ........................................................................................... 5

2-4 HIGH VOLTAGE WARNING ....................................................................... 6

3. OPERATING INSTRUCTIONS ................................................................................ 7

4. ADJUSTMENT .......................................................................................................... 8

4-1 ADJUSTMENT CONDITIONS AND PRECAUTIONS ............................... 8

4-2 MAIN ADJUSTMENTS ................................................................................. 8

4-3 ADJUSTMENT METHOD ............................................................................. 8-10

5. CIRCUIT DESCRIPTION .......................................................................................... 11

6. TROUBLE SHOOTING CHART .............................................................................. 15

6-1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS .............................. 15

6-2 ABNORMAL DISPLAY ................................................................................. 17

6-3 NO BLANKING ........................................................................................... 18

6-4 HOR. /OSC /DEF /HV CIRCUIT FAULT ...................................................... 18

6-5 ABNORMAL HORIZONTAL DEFLECTION .............................................. 19

6-6 ABNORMAL VERTICAL SCANNING ........................................................ 20

6-7 SIDE-PIN CUSHION DISTORTION ............................................................. 20

6-8 POOR FOCUS ................................................................................................. 20

6-9 POWER SUPPLY TROUBLE SHOOTING CHART .................................... 21

7. MECHANICAL OF CABINET FRONT DIS-ASSEMBLY...................................... 22

8. PARTS LISTING ....................................................................................................... 23

9. BLOCK DIAGRAM (DEFLECTION) ....................................................................... 44

10. IC BLOCK DIAGRAMS............................................................................................ 45

11. PCB LAYOUT ............................................................................................................ 49

12. SCHEMATIC DIAGRAM ......................................................................................... 51

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1. SPECIFICATIONS FOR C993 SERIES COLOR MONITOR

1. CRT : 48.2CM(19") 90 Deflection, 29mm Neck, 0.26mm Dot Pitch, Non-Glare Screen

2. Viewable image Size: 45.7CM (18") diagonal

3. Display Color: Unlimited Colors

4. External Controls: Power On/O ff, OSD key, Fu nction knob: Co ntrast, Bright ness, H-Size, H- Center, V-Siz e, V-Center, ZO OM, Pincushion, Trapezoid, Pin-Balance, Parallelogram, Rotation, Moire Reduce, Recall, Degaussing, Color Temperature.

5. Input Video Signal

Mode 1 Mode 2 Mode 3 Mode 4 Mode 5

RGB Analog RGB Analog RGB Analog RGB Analog RGB Analog

Horiz. Sync: TTL Level TTL Level TTL Level TTL Leve l TTL Level

Negative Negative Positive Positive Positive

Vert. Sync : TTL Level T TL Level TTL Level TTL Level TTL Level

Positive Negative Positive Positive Positive

Horizontal: 640 (H) 720 (H) 800 (H) 800 (H) 1024 (H) Vertical : 480 (V) 400 (V) 600(V) 600 (V) 768 (V) Fh (kHz) : 31.47 31.47 46.875 53.67 60.02 Fv (Hz) : 60 70 75 85 75

Mode 6 Mode 7 Mode 8 Mode 9

RGB Analog RGB Analog RGB Analog RGB Analog

Horiz. Sync: TTL Level TTL Level TTL Level TTL Level

Positive Positive Positive Positive

Vert. Sync : TTL Level TTL Leve l TTL Level TTL Level

Positive Positive Positive Positive

Horizontal: 1024 (H) 1280 (H) 1280 (H) 1600 (H) Vertical : 768 (V) 1024 (V) 1024 (V) 1200 (V) Fh (kHz) : 68.6 79.6 91.1 93.8 Fv (Hz) : 85 75 85 75

6. Display Size Horizontal: 346 mm Vertical: 260 mm

7. Scanning Frequencies Horizontal: Vertical:

8. Factory Preset Timings: 9 User Timings: 20

9. Misconvergence Center: 0.3 mm Max. Corner: 0.4 mm Max.

10. Video Dot Rate: 202 MHz

30KHz ~ 96KHz 50 Hz ~ 160 Hz

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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)

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15 Dimensions Monitor:

Carton:

Monitor:

16. External Connection :

15 Pin D-type Connector AC Power Cord

17. Regulations: T ÜV/ERGO, TÜV/GS, CE, NEMKO

574(W) × 537(H) 460(W)

466(H)

TCO’99

594(D) mm

470(D) mm

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2. PRECAUTIONS AND NOTICES

2-1 SAFETY PRECAUTIONS

1. Observe all caution and safety related notes located inside the d isplay cabinet.

2. 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.

3. Do not install, remove or handle the picture tube in any manner unless shatter-proof goggles are worn. People who are not so equipped should be kept away while handling picture tube. Keep picture tube away from the body while handling.

4. The picture tube is constructed to limit X-RAY radiation to 0.5 mR/HR. For continued protection, use the designated replacement tube only, and adjust the voltages so that the designated maximum rating at the anode will not be exceeded.

5. Before returning a serviced display to the customer, a thorough safety test must be performed to verify that the display is safe to operate without danger or shock. Always perform an AC leakage current check on the exposed metallic parts of the cabinet, such as scre w heads. Test method for current leakage is described as follow. (a) P lug the AC line cord directly into rated AC outlet (do not use a line isolation transformer during this

check).

(b) Use an AC voltmeter having 5000 ohms per volt or with more sensitivity in the following manner:

Connect a 1500 ohms 10 Watt resistor, paralleled by a 0.15UF, AC type capacitor between a known good earth ground (water pipe, conduit, etc.) and the exposed metallic parts simultaneously. Measure the AC voltage across the combination of 1500 ohms resistor and 0.15UF capacitor.

part.

(d) Voltage measured must not exceed 0.5 volts RMS. This corresponds to 0 .35 milliamp AC. Any value

exceeding this limit constitutes a potential shock hazard and must be corrected immediately.

2-2 PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in this chassis have special safety visual inspections and the protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. 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 ma y create shock, fire, X-RAY radiation or other hazards.

2-3 SERVICE NOTES

1. When replacing parts or circuit boards, clamp the lead wires around terminals before soldering.

2. When replacing a high wattage resistor (more than 1/2W of metal oxide film resistor) in circuit board, keep the resistor about 10mm (1/2 in) away from circuit boa r d.

3. Keep wires away from high voltage or high temperature components.

4. Keep wires in their original position so as to re duce interference.

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 vo l tage equi pment. Exercise care when servicing this chassis with power applied. Many B plus and high voltage terminals are exposed which, if carelessly contacted, can cause serious shock or result in damage to the chassis. Maintain interconnecting ground lead connections between chassis and picture tube dag when operating chassis. Certain HV failures can increase X-ray radiation. Monitor should not be operated with HV levels exceeding the specified rating for the chassis type. The maximum operating HV specified for the chassis used in this monitor is

26KV ± 1KV

with a line voltage of 120/240 VAC. Higher voltage may also increase possibility of failure in HV supply. It is important to maintain specified values of all components in the horizontal and high voltage circuits and anywhere e lse in the monitor that coul d cause a rise in high volta ge or opera ting supply vo ltages. No cha nges should be made to the original design of the monitor. Components shown in the shaded areas on the schematic should be replaced with exact factory replacement parts. The use of unauthorized substitute parts may create a shock, fire or other hazard. To determine the presence of high voltage, use an accurate, high impedance, HV meter connected between second anode lead and CRT dag grounding device. When servicing the High Voltage System, remove static charge from it by connecting a 10K ohm resistor in series with an insulated wire (such as a test probe) between picture tube dag and 2nd anode lead.(AC line cord disconnected from AC power outlet.) The picture tube used in this monitor employs integral implosion protection. Replace with tube of the same type number for continue safety. Do not lift picture tube by the neck. Handle the picture tube only after discharging the high voltage completely.

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3. OPERATING INSTRUCTIONS

This procedure gives you instructions for installing and using the C993 color display.

1. Position the display on the desired operation and plug the power cord into a convenient AC outlet. T hreewire power cord must be shielded and is provided as a safety precaution as it connects the chassis and cabinet to the electrical conduit ground. I f the AC outlet in your location d oes not have provisions for the grounded type plug, the installer should attach the proper adapter to ensure a safe ground potential.

2. Connect the 15-pin color display shielded signal cable to your signal system device and lock both screws on the connector to ensure firm grounding. The connector information is as follow:

15 - Pin Color Displa y Signal Cable

PIN NO.

DESCRIPTION

PIN NO.

DESCRIPTION

1. RED 9. NC

2. GREEN 10. GND

3. BLUE 11. SYNC. GND

4. GND 12. SDA

5. GND 13. HORIZ. SYNC

6. GND-R 14.

VERT. SYNC (VCLK)

7. GND-G 15. SCL

8. GND-B

3. Apply power to the display by turning the power switch to the "ON" position and allow about thirty seconds for display tube warm-up. The Power-On indicator lights when the display is on.

4. With proper signals feed to the display, a pattern or data should appear on the screen, adjust the brightness and contrast to the most pleasing display.

5. T his monitor has po wer saving function following the VES A DPMS. Be sure to connect the si gnal cable to the PC.

6. If your C993 Series color display requires service, it must be returned with the power cord.

11 15

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4. ADJUSTMENT

4-1 ADJUSTMENT CONDITIONS AND PRECAUTIONS

1. Approximately 30 minutes should be allowed for warm up before proceeding.

2. Adjustments should be undertaken only on those necessary elements since most of them have been carefully preset at the factory.

4-2 MAIN ADJUSTMENTS

NO. FUNCTION LOCATION DESIGNATION

1. 14.5V ADJ PCB - MAIN VR901

2. B + ADJ PCB - MAIN VR902

3. SCREEN ADJ FLY BACK TRANS T402

4. FOCUS ADJ FLY BACK TRANS T402

5. ABL ADJ PCB - MAIN VR701

6. SUB-BRIGHTNESS ADJ PCB - MAIN VR702

-MENU

PCB - MAIN SW103

-UP

PCB - MAIN SW105

7. FUNCTION ADJ -DOWN

PCB - MAIN SW104

-EXIT

PCB - MAIN SW102

4-3 ADJUSTMENT METHOD

1. 14.5V, B + & HV voltage adjustment:

A. Chrome-2000 Signal generator or PC equivalent set mode 1, VGA 640X480 pattern 1.0 . B. Connect a DC Volt meter between TP901 or D922 cathode and ground, then adjust VR901 to be 14.5VDC. C. Connect a DC Volt meter between TP902 or D925 cathode and ground, then adjust VR902 to be 60.5 VDC. D. Connect a DC Volt meter between TP701(G1) and ground, Brightness set to max. T hen adjust VR702 to

be -50 VDC.

2. Factory preset Timings Adjustment:

A. Press MENU Key to show OSD window press Up or Down Key to switch the functional controls. B. Press the Up Key to select the "ZOOM" function, then press the MENU Key. While do not release the

MENU Key until the OSD window changed to the Factory preset window.

C. The Factory preset window contains the following functional controls. Select one of the control. Then press

the Up/Down Key to adjust it's value for the optimum picture.

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FACTORY PRESET

H: 36.51kHz

V: 51.34Hz

VcVs

9300

6500

080

CONTRAST

BRIGHTNESS

H-CENTER

H-MOIRE REDUCE

V-MOIRE REDUCE

R-GAIN

Vs Vc

H-SIZE

V-CENTER

V-SIZE

ZOOM

TOP COMER

BOTTOM COMER

PINCUSHION

TRAPEZOID

PIN-BALANCE

PARALLELOGRAM

ROTATION

SUB-V-SIZE

SUB V-CENTER

9300

6500

G-GAIN

B-GAIN

R-BIAS

G-BIAS

R-BIAS

COLOR TEMPERATURE

DEGAUSS

OSD EXIT

RETURN

Vs LINEAR

Vc LINEAR

MENU Key to Quit the OSD window. Mean while the new setting data will be saved in t he memory.

E. To switches the input signal to the other Timing Mode. Please follow step C ~ D to get the optimum picture.

F. Select the "

returned to the original OSD window.(user's operating condition)

" RETURN function and press t he MENU Key, then the Factor P reset windo w will be

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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. White Balance, Luminance adjustment: A. B ias (Low Luminance) adjustment:

(a) Set mode 2 640 X 480 Fh: 31KHz full white pattern. (b) To make the adjustment condition is under the Factory preset window.

Same as step 2-C.

set to maximum. Co ntrast set to min. full white pattern, the n adjust FBT screen

VR to make Y= 1.0FL ± 0.2FL

(e) Brightness set to raster just cutoff, adjust con t rast to be 4FL, the n adjust G-Bias

R-Bias

, to make the setting value is( 20), then adjust the R.G.B Bias individual to the colo r

, B-Bias ,

temperature x= 281 ± 10, y= 311 ± 10.

B. Gain (High light) adjustment:

(a) Set mode 2 640 X 480 Fh: 31.5KHz full white pattern. (b) Brightness set to raster just cutoff and set the contrast to max.

10.

, B-Gain , R-Gain , to make color temperature x=283 ± 10, y=293

C. Recheck item A&B to make sure both of them in spec. Finally select OSD function to the 9300°K function,

then press the MENU Key. To make the setting data saved in the memory. D. The adjustment of 6500°K white Balance, May follow step A ~ C , with the x=313 ± 10, y=329 ± 10. E. Full white luminance:

(a) Set mode 2 640 X 480 Fh: 31.5KHz full white pattern.

(b) Image Size : H:346±4mm V:260±4mm.

(d) Adjust VR701 to the luminance at 30 FL ± 2FL.

4. Focus Adjustment: A. Set mode 2 640 X 480 Fh: 31.5KHz with character full page. B. Adjust brig ht nes s to center an d contrast to max. C. Then adjust focus VR1 to a fine vertical line. D. Adjust focus VR2 to a fine horizontal line. E. Repeat step C & D..

5. Purity Adjustment A. Be sure that the display is no t being exposed to any external magnetic fields. B. Ensure that the spacing between the Purity, Convergence, Magnet, (PCM), assembly and the CRT stem is

29mm .(See below diagram)

C. Pr oduce a complete, red pattern on the displa y. Adjust the purity magnet rings o n the PCM assembly to

obtain a complete field of the color red. This is done by moving the two tabs in such a manner that they advance in an opposite direction but at the same time to obtain the same angle between the two tabs, which should be approximately 180'.

D. Check the complete blue and complete green patterns to observe their respective color purity. Make minor

adjustments if needed.

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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 brigh tness to the desired condition.

C. Vertical red and blue lines are converged by varying the angle between the two tabs of the 4 pole magnets

on the PCM assembly. (See above diagrams)

D. Horizontal red and blue lines are converged by varying the two tabs together, keeping the angle between

them constant. E. Produce a white crosshatch pattern on the display. F. Vertical gree n and magenta lines are converged by varying the angle between the two tabs of the 6-pole

magnets. G. Horizontal green and magenta lines are converged by varying the two tabs together, keeping the angle

between them constant.

5. CIRCUIT DESCRIPTION

5-1 MICRO CONTROLLER CIRCUIT

MICRO Controller

The IC101 contains a 6502 8-bit CPU core, 256 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.

H/V sync signals proce ssor

The functions of the sync processor include polarity detection, H-SYNC & V-SYNC signals counting, Programmable SYNC signals output, free running signal generator. Pin39/Pin40 are for the H-SYNC and V-SYNC input, Pin32/Pin33 will output the same signal as input sync signal without delay, and the polarity are setting in the positive. Whe n no signal input, the Pin32 wil l output a 61HZ V- SYNC free run si gnal. The Pin33 will output a 62.5KHz H-SYNC free run signal. for the monitor testing use.

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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. Pin5 is input the horizontal fly back pulse, for PLL generator tracking. Pin6 is left floating, I2C bus is enabled. Otherwise the SPI bus is enabled. Pin7 the external data transfer through this pin to internal display registers and control registers Pin8 the clock-input pin is used to synchronize the data transfer. Pin10 is input the vertical flyback pulse for synchronizing the vertical position. Pin12 is output a blanking signal to cut off external R.G.B signals of VGA while this chip is displaying characters or windows. Pin13, Pin14, Pin15 is used to output the OSD (B.G.R) video signal.

5-2 DEFLECTION CIRCUIT

The deflection circuit is achieved by a high performance and efficient solution IC 401 (TDA4856) for this monitor. The concept is fully DC controllable and can be used in applications with a micro-controller solutions. The TDA 4856 provides sync. Processing with full auto sync. capability, a flexible SMPS block and an extensive set of geometry con trol facilities. Further t he IC generates the dr ive wavefor ms for DC coupled vertical boosters to the TDA 4866 [ref Page-28].

Horizontal Oscillator

The oscillator is of the relaxation type and requires a capacitor of 10nF C403 at pin 29. The maximum oscillator frequency is determined by a resistor R403 form pin 28 to ground. A resistor R402 from pin27 to pin28 defines the frequency range.

PLL 1 Phase Detector

The phase detector is a standard one using switched current sources. It compares the middle of H-sync. with a fixed point on the oscillator saw-tooth voltage. The PLL loop filter c401, R401, C402 is connected to Pin26.

PLL2 Phase Detector

This phase detector is similar to the PLL1 detector and compares the line flyback pulse at pin 1 with the oscillator saw-tooth voltage. The PLL2 detector thus compensates for the delay in the external H-deflection circuit by adjusting the phase of the HDRV output pulses. The phase between H-flyback and H-sync can be controlled at pin30.

X-ray Protection

The X-ray protection input pin2 provides a voltage detector with a precise threshold. If the voltage exceeds this threshold for a certain time, an internal latch switches the whole IC into pro tectio n mode. In this mode several p ins are forced into defined states: Pin7 (HDRV) is floating Pin6 (B DRV) is floa t ing Pin12, 13 ( VOUT 1, 2) are floating Pin16 (CLBL) provides a continuous blanking signal.

Vertical Oscillator

The vertical free –running frequency is determined by the resistor R608 at pin23 and capacitor C604 at pin24. Usually t he free-running frequency should be lower than the minimum trigger freque ncy.

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5-3 TRANSISTOR & DIODE CIRCUI T

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 Q416 B+ MUTE D414~ D417,D419 Buffer Diode for IC403 D421 ~ D423 Detected for Q406 Q401 B+ Mute Control Q402 Horizontal Driver Q403 Horizontal Out Put Q404, Q406 A differential Amp for Drive Q405 Q405 DarlingtonTransistor for H-Size Control Q407 Horizontal Linearity Correction Control Q410, Q412, Q417 Horizontal S-Correction Control Q418, Q420 Horizontal S-Correction Control ZD601,ZD602 VF Voltage Divider D707 Mixing Diode D703 Buffer Diode D704 Rectifier for 250V Supply D705 Protection Diode for Q708

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 D913 Speed UP for Q901 D914 Synchronous Trigger for Power Supply D918 ~ D919 Rectifier for Output Voltage Supply D921 ~ D923 Rectifier for Output Voltage Supply D924 Clip Diode for Trigger CKT D925 Rectifier for B+ Supply D926, D927 Raster Position Control D939 Clip Diode for Snuffer Pulse ZD901 Protection Diode ZD902 Protection Diode ZD903 Protection Diode Q901 MOS FET for Switching Power Control Q904, Q906 Start up CKT for IC901 Q908, Q916 To Turn 6.3V Supply Off when the Off Mode is Required Q909, Q910 To Turn 14.5V Supply Off when the Off or Suspend Mode is Required Q911 MOS FET for B+ Control Q912, Q915 Push Pull Driver for Q911 Q914 Pre-Amplifier for Q912, Q915 D817 ~ D819 DC Restoration for CRT Bias Adjustment D814 ~ D816 Protection Diode for Q808, Q809, Q810, Q811, Q812, Q813 Q801 A.B.L Control Q817 ~ Q819 DC Restoration for CRT Bias Adjustment

6.TROUBLE SHOOTING CHART

6-1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS

CHECK MAIN PCB POWER SUPPLY

60.5V, 14.5V, 80V

CHECK THE HIGE VOLTAGE OF CRT ABOUT 25.5 ~ 26.5KV

CHECK THE VOLTAGE OF CRT

HEATER ABOUT 6.3V

CHECK POWER SAVING CIRCUIT, H-SYNC, V-SYNC SIGNAL

REFER ITEM S.M.P.S.

CHECK FAILSAFE CKT IC401

PIN 2 RELATIVE CKT.

CHECK CRT'S HEATER RELATIVE CIRCUIT

CHECK SCREEN VOLTAGE ABOUT

400V TO 700V

LESS THAN 300V

BRIGHTNESS SET TO MAX. THEN CHECK CRT G1 VOLTAGE

CHECK VOLTAGE OF THE CRT

CATHODE ABOUT 60V TO 70V

CHECK FBT

CHECK BRIGHTNESS CIRCUIT Q703, Q706, Q707 RELATIVE CKT.

REFER ITEM 8-2 "ABNORMAL DISPLAY"

2.ABNORMAL VIDEO LEVEL ON SCREEN

CHECK THE VOLTAGE OF IC801

PIN 6, 9, 22 ABOUT 12V

CHECK THE SIGNAL INPUT OF R.G.B. ABOUT 0.7Vpp

CHECK IC801 PIN 15 CLAMP PULSE PIN 16 BLANK PULSE

CHECK THE VIDEO OUTPUT OF IC801

PIN 18, 20, 23 ABOUT 4Vpp,

CONTRAST SET MAX.

CHECK 12V RELATIVE CIRCUIT

CHECK SIGNAL CABLE OR

INTERFACE CARD.

CHECK THE IC105 RELATIVE CIRCUIT

OR IC401 PIN 16 OUTPUT

CHECK IC801 PIN 13 ABOUT 4V PIN 26, 27, 28 ABOUT 4V OR CHECK Q801 AND RELATIVE CKT

R.G.B. APPROACH STANDARD

3. ABNORMAL DDC (PLUG & PLAY)

CHECK IC101 PIN 5 VOLTAGE ABOUT 5V

CHECK SIGNAL CABLE OR H802 PIN 3, 4 DATA OUTPUT

CHECK Q102 GOOD OR FAIL

1.NO SIGNAL ON SCREEN

CHECK VIDEO IC801 VCC ABOUT 12V

6-2 ABNORMAL DISPLAY

CHECK THE OUTPUT VOLTAGE OF IC801 PIN 18, 20, 23 ABOUT 3Vpp

CHECK THE B+ VOLTAGE OF VIDEO PCB ABOUT 80V

CHECK THE VOLTAGE OF CRT CATHODE ABOUT 40Vpp

CHECK THE 12V PIN OF P802 CONNECTOR

CHECK THE RELATIVE CIRCUIT OF IC801

CHECK THE 80V RELATIVE CIRCUIT

OF SMPS ON MAIN PCB

CHECK THE VOLTAGE OF FBT SCREEN ABOUT 400V TO 700V

LESS THAN 400V

EXCEED 700V

CHECKTHE VQ802 ~ Q807 RELATIVE CIRCUIT

CHECK FBT RELATIVE CIRCUIT

CHECK FBT & CRT RELATIVE CIRCUIT OR REFER ITEM 7-1

+ 39 hidden pages

HP D8911A Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual