Adjustment; Adjustment Conditions And Precautions; Main Adjustments; Adjustment Method - HP D8911A Service Manual

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
1. 14.5V ADJ
2. B + ADJ
3. SCREEN ADJ
4. FOCUS ADJ
5. ABL ADJ
6. SUB-BRIGHTNESS ADJ
7. FUNCTION ADJ

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. Then 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.

4. ADJUSTMENT

LOCATION
PCB - MAIN
PCB - MAIN
FLY BACK TRANS
FLY BACK TRANS
PCB - MAIN
PCB - MAIN
PCB - MAIN
2
-MENU
-UP PCB - MAIN
-DOWN PCB - MAIN
PCB - MAIN
1
-EXIT
DESIGNATION
VR901
VR902
T402
T402
VR701
VR702
SW103
SW105
SW104
SW102