XAV-77 - Sony Car Audio Service Manual (repair manual). Page 17

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17
XAV-77
A
γ
0 ADJUSTMENT
Connection:
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:
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.
+
–
degital
voltmeter
NTSC/PAL pattern
generator
TP152 (GND)
TP65
set
(XAV-77)
connection box
(XA-114)
INPUT1
VIDEO jack
+
–
NTSC/PAL pattern
generator
TP152 (GND)
TP77
set
(XAV-77)
connection box
(XA-114)
osclloscope
INPUT1
VIDEO jack
BRIGHT ADJUSTMENT
Connection:
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:
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.
B
+
–
NTSC/PAL pattern
generator
TP152 (GND)
TP77
set
(XAV-77)
connection box
(XA-114)
osclloscope
INPUT1
VIDEO jack
+
–
NTSC/PAL pattern
generator
TP152 (GND)
TP108
set
(XAV-77)
connection box
(XA-114)
osclloscope
INPUT1
VIDEO jack
C
0V
D
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