Tatung VM7K9, Руководство по обслуживанию

Страница: 8 / 50

8
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. 14.5V ADJ PCB - MAIN VR901
2. B + ADJ PCB - MAIN VR902
3. SCREEN ADJ FLY BACK TRANS T402
4. FOCUS ADJ FLY BACK TRANS T402
5. ABL ADJ PCB - MAIN VR701
6. SUB-BRIGHTNESS ADJ PCB - MAIN VR702
-MENU
2
PCB - MAIN SW103
-UP PCB - MAIN SW105
7. FUNCTION ADJ -DOWN PCB - MAIN SW104
-EXIT
1
PCB - MAIN SW102
4-3 ADJUSTMENT METHOD
1. 14.5V, B + & HV voltage adjustment:
A. Chroma-2000 Signal generator or PC equivalent set mode 1, VGA 640
X
480 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 controls. Then
press the Up/Down Key to adjust it's value for the optimum picture.