Sony XAV-7W Service Manual page 17

γ 0 ADJUSTMENT
Connection:
INPUT1
VIDEO jack
PAL pattern
generator
connection box
(XA-114)
(XAV-7W)
Adjusting Procedure:
1. Connect a digital voltmeter to the TP65 on the MONITOR
board.
2. Adjust the RV212 so that the reading of digital voltmeter is
2.51 ± 0.04 V.
RGB AMP ADJUSTMENT
Connection:
INPUT1
VIDEO jack
PAL pattern
generator
connection box
(XA-114)
(XAV-7W)
Adjusting Procedure:
1. Connect an oscilloscope to the TP77 on the MONITOR board.
2. Adjust the RV208 so that the A level of the waveform on the
oscilloscope is 4.80 ± 0.04 V.
TP65
degital
voltmeter
set
+
–
TP152 (GND)
TP77
osclloscope
set
+
–
TP152 (GND)
A
BRIGHT ADJUSTMENT
Connection:
INPUT1
VIDEO jack
PAL pattern
generator
connection box
(XA-114)
(XAV-7W)
Adjusting Procedure:
1. Connect an oscilloscope to the TP77 on the MONITOR board.
2. Adjust the RV201 so that the B level of the waveform on the
oscilloscope is 4.20 ± 0.04 V.
V COM, V COM CENTER ADJUSTMENT
Connection:
INPUT1
VIDEO jack
PAL pattern
generator
connection box
(XA-114)
(XAV-7W)
Adjusting Procedure:
1. Connect an oscilloscope to the TP108 on the MONITOR board.
– V COM ADJUSTMENT –
2. Adjust the RV210 so that the C level of the waveform on the
oscilloscope is 8.40 ± 0.05 V.
– V COM CENTER ADJUSTMENT –
3. Adjust the RV211 so that the D level of the waveform on the
oscilloscope is –2.40 ± 0.05 V.
XAV-7W
TP77
osclloscope
set
+
–
TP152 (GND)
B
TP108
osclloscope
set
+
–
TP152 (GND)
C
0V
D
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