AOC S792-3 Series, Руководство по обслуживанию, Страница: 4 / 51

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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. B + ADJ PCB - MAIN VR902
2. SCREEN ADJ FLY BACK TRANS T402
3. FOCUS ADJ FLY BACK TRANS T402
4. ABL ADJ PCB - MAIN VR701
5. SUB-BRIGHTNESS ADJ PCB - MAIN VR702
-MENU PCB - MAIN SW103
-UP PCB - MAIN SW105
6. FUNCTION ADJ -DOWN PCB - MAIN SW104
-EXIT PCB - MAIN SW102
4-3 ADJUSTMENT METHOD
1. B + & HV voltage adjustment and hold down circuit confirmation:
A. Chrome-2000 Signal generator or PC equivalent set mode 2, VGA 640 X 480 pattern 1.0 .
B. Connect a DC Volt meter between TP902 or D925 cathode and ground, then adjust VR902 to be
61.0VDC(B+).
C. Connect a DC Volt meter between TP701(G1) and ground, Brightness set to max. Then adjust VR702 to
be–-50 VDC.
D. Connect a 22k
Ω
resistor in parallel with R419 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 control. Then press
the Up/Down Key to adjust it's value for the optimum picture.
080
FACTORY PRESET
H: 36.51kHz
V: 51.34Hz
Vc Vs
Tm
9300
6500
CONTRAST H-MOIRE REDUCE
BC
BC BC
BC
TC
TC TC
TC
BI BI BI BI
HS HP
H: 68.8KHz V: 85Hz
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