Read Sony XTL-75V Service Manual online
13
γ
2 Adjustment
Adjustment Procedure:
1. Display the gray scale on the monitor screen.
2. Connect a oscilloscope to TP (G) on the G board.
3. Adjust RV408 so that the white level becomes 3.6 V.
1. Display the gray scale on the monitor screen.
2. Connect a oscilloscope to TP (G) on the G board.
3. Adjust RV408 so that the white level becomes 3.6 V.
R Sub Bright Adjustment
Adjustment Procedure:
1. Display the gray scale on the monitor screen.
2. Connect a oscilloscope to TP (R) on the G board.
3. Adjust RV403 so that the third step from the bottom becomes
1. Display the gray scale on the monitor screen.
2. Connect a oscilloscope to TP (R) on the G board.
3. Adjust RV403 so that the third step from the bottom becomes
1.2 V.
Adjsutment Location:
3.6 V
GND
1.2 V
GND
B Sub Bright Adjustment
Adjustment Procedure:
1. Display the gray scale on the monitor screen.
2. Connect a oscilloscope to TP (B) on the G board.
3. Adjust RV404 so that the third step from the bottom becomes
1. Display the gray scale on the monitor screen.
2. Connect a oscilloscope to TP (B) on the G board.
3. Adjust RV404 so that the third step from the bottom becomes
1.2 V.
Note:
After all adjustments finished, enter connect the PAL pattern generator to
check that a picture appears.
check that a picture appears.
1.2 V
GND
RV401
V COM
AMPLITUDE
Adjustment
RV404
B SUB
B SUB
BRIGHT
Adjustment
RV406
RGB
AMPLITUDE
Adjustment
RV409
V COM BIAS
Adjustment
RV403
R SUB BRIGHT
Adjustment
RV405
BRIGHT
Adjustment
RV407
γ
0
Adjustment
RV408
γ
2
Adjustment
– G BOARD (Side A) –
TP (BRIGHT)
C424
TP (R)
TP (COM)
TP (G)
TP (B)
– G BOARD (Side B) –
TP415
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