Adjustment - ViewSonic P95f+-1 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. HV ADJ
2. 180V ADJ
3. SCREEN ADJ
4. FOCUS ADJ
5. ABL ADJ
6. SUB-BRIGHTNESS ADJ
7.
FUNCTION ADJ
4-3 ADJUSTMENT METHOD
1. 180V, Sub-Brightness & HV voltage adjustment:
A. Chroma-2225 Signal generator or PC equivalent set mode 1, VGA 1024X768 pattern 1.0.
B. Connect a DC Volt meter between TP901 or D918 cathode and ground, then adjust VR901
to be 180VDC.
C. Connect an accurate, high impedance, HV meter between second anode lead and CRT
dag grounding device. Then adjust VR703 to be 26.0KVDC.
D. Connect a DC Volt meter between TP701(G1) and ground, Brightness and contrast set to
50DAC. Then adjust VR702 to be -10 VDC.
E. Connect a 20kΩ resistor in parallel with R403 to increase the HV, the hold down circuit will
operate and the display will disappear. Then disconnect this resistor to bring the unit to
normal condition.
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
controls. Then press the Up/Down Key to adjust it's value for the optimum picture.
ViewSonic Corporation
4.

ADJUSTMENT

LOCATION
PCB - MAIN
PCB - MAIN
FLY BACK TRANS
FLY BACK TRANS
PCB - MAIN
PCB - MAIN
PCB - MAIN
-MENU
2
-UP PCB - MAIN
-DOWN PCB - MAIN
PCB - MAIN
-EXIT
1
SBQ SELECT
6
DESIGNATION
VR703
VR902
T402
T402
VR701
VR702
<SW103>
<SW105>
<SW104>
<SW102>
(SW104)
Confidential – Do Not Copy
P95f+/B-1