Adjustment; Adjustment Conditions And Precautions; Main Adjustments; Adjustment Method - AOC 7Alr Series 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-2000 Signal generator or PC equivalent set mode 1, VGA 1024X768 pattern 1.0.
B. Connect a DC Volt meter between D918 cathode and ground, then adjust VR902 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 25.0KVDC.
D. Connect a DC Volt meter between TP701(G1) and ground, Brightness set to center and contrast set to max. 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.
D. Press MENU Key to Quit the OSD window. Mean while the new setting data will be saved in the memory.
E. To switches the input signal to the other Timing Mode. Please follow step C ~ D to get the optimum picture.
F. Select the "
to the original OSD window.(user's operating condition)
G. The setting data of the CONTRAST, BRIGHTNESS, PIN-BALANCE, PARALLELOGRAM, ROTATION,
COLOR TEMPERATURE are common mode saved in the memory. Don't needed adjust it individual at every
timing Mode and save in the memory.
H Model select: for factory only, service engineer can't changed.

4. ADJUSTMENT

2
-MENU
-UP
-DOWN
1
-EXIT
" RETURN function and press the MENU Key, then the Factor Preset window will be returned
LOCATION
PCB - MAIN
PCB - MAIN
FLY BACK TRANS
FLY BACK TRANS
PCB - MAIN
PCB - MAIN
PCB - MAIN
PCB - MAIN
PCB - MAIN
PCB - MAIN
8
DESIGNATION
VR703
VR902
T402
T402
VR701
VR702
SW4
SW5
SW6
SW7