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4. ADJUSTMENT
4-1ADJUSTMENT 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.
220V ADJ
PCB - MAIN
VR902
2.
HV ADJ
PCB - MAIN
VR703
3.
SCREEN ADJ
FLY BACK TRANS
T403
4.
FOCUS ADJ
FLY BACK TRANS
T403
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
-VIDEO 1/2
PCB - MAIN
SW102
4-3 ADJUSTMENT METHOD
1. 25V, HV voltage adjustment:
A. Chroma-2000 Signal generator or PC equivalent set mode 1, VGA 1024
X
768 pattern 1.0 .
B. Connect a DC Volt meter between D918 cathode and ground, then adjust VR902 to be 220VDC.
C.
Connect a DC Volt meter between TP701(G1) and ground, Brightness set to max. Then adjust
VR702 to be
-35 VDC(HM703*)/-55VDC (HA(F)703*)/-10VDC (HM704U*)
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 "Information" 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.
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