HP MV7540 SERVICE MANUAL 17’’ CDT MONITOR MV7540 THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT GUARANTEE THE ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS LIABILITY FOR...
HP MV7540 1. Monitor Specifications CRT : 43.2CM(17") 90 Deflection, 29mm Neck, 0.27mm Dot Pitch, Pure Flat, Non-Glare Screen Viewable image Size: 40.6CM (16") diagonal Display Color: Unlimited Colors External Controls: Power On/Off, Power led, Function knob( Contrast, Brightness, H-Center, H-Size, V-Center, V-Size, Rotation, Pincushion, Trapezoid, Pin-Balance, Parallelogram, Color Temperature, Degaussing, Recall, Moiré,...
HP MV7540 11. Humidity: 20% to 80% Relative, Non-Condensing 12. External Connection: 15 Pin D-type Connector AC Power Cord 13. The rotation can’t be recall in user mode. 14. Press the “MENU”funtion and don’t release it,then press power swith on,the monitor will enter the burn- in mode if it is no signal input.
HP MV7540 2. Precautions And Notices 2-1 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.
HP MV7540 2-4 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.
HP MV7540 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.
HP MV7540 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.
HP MV7540 H-SIZE H-MOIRE REDUCE H-CENTER V-MOIRE REDUCE V-SIZE MOIRE DISABLE V-CENTER NO USE PINCUSHION NO USE PARALLELOGRAM NO USE PIN-BALANCE V-LINEARITY TRAPEZOID V-LINEARITY ROTATION TOP CORNER NO USE BOT CORNER ABL ADJUST FREQUENCY SELECT CONTRAST MAX-HSIZE MODIFY BRIGHTNESS MAX-VSIZE MODIFY...
HP MV7540 (d) Put the probe in the middle of screen, Brightness set to maximum. Contrast set to max. change to Raster pattern(No video)1024×768 @85Hz, set G-Bias 45,then adjust B-Bias , R-Bias and FBT screen VR, to make the color temperature x= 260 ±10, y= 290 ±...
HP MV7540 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. Vertical red and blue lines are converged by varying the angle between the two tabs of the 4 pole magnets on the PCM assembly.
HP MV7540 5. Circuit Description 5-1 Micro Controller Circuit MICRO Controller The IC101 contains a 6502/8051 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...
HP MV7540 5-3 Transistor & Diode Circuit Location Circuit Function Description D901~D904 Bridge Rectifier for AC Source D910 Clamp Diode for snub CKT 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...
HP MV7540 6.Trouble Shooting Chart 6-1 No Power Check the load first because it may be No raster, the indicator is caused by load short. not on. Check the load components as: IC901, Q911, Check the voltage across C907 is Q403, D922, D925, D919,D923.
HP MV7540 6-2. No Raster, No High Voltage, Indicator Is Orange (2)No signal is normal but it is orange when there is (1)Indicator is orange when there is signal input. no signal Abnormal Cut pin5 of IC101, then check if it is normal.
HP MV7540 6-3. No Raster, Indicator Is Green If the indicator of functional key is normal when there’s no signal. Check CPU control circuit 1. 5v power supply circuit 2. Rest circuit 3. oscillator C bus circuit. Connect with signal and check the voltage of G1 is between -25 and -65V.
HP MV7540 Section1 Enter into factory mode to adjust brightness, contrast and look if the picture is normal. If it can be adjusted to normal picture and stored. Check if the voltage of filament is normal. Replace IC102 Check the voltage of G2 is Check power-saving circuit and 6.3Vpower supply...
HP MV7540 Section2 Check if the voltage at base of Q403 is 0v Check if the voltage at pin29 of IC401 is 11.5V Check the voltage at pin26 of Cut pin29 and check if IC401 is normal when the voltage of circuit is H-frequency is 31KHZ.
HP MV7540 6-4 H-Size Fails To Be Adjusted The picture is too large and H-size can’t be adjusted The picture is too small and H-size can’t be adjusted Cut the collector of Q406 and look if the picture becomes Check if the voltage of H-size control smaller, then check the voltage of circuit is half of B+.