Sony DCR-TRV738E Service Manual page 104

DCR-TRV738E/TRV740/TRV740E/TRV840
5. Contrast Adjustment (PD-160 board)
Set the level of the VIDEO signal for driving the LCD to the specified
value. If deviated, the screen image will be blackish or saturated
(whitish).
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Note1: NTSC model: DCR-TRV740/TRV840
PAL model: DCR-TRV740E
Note2: The data of page: 0, address: 10 must be "00".
Adjusting method:
Order Page Address Data
1 0 01
2 C 69
3 C 69
4 0 01
100 IRE
A
Pedestal
VTR stop
No signal
Pin 3 of CN5502 (VG)
Ext. trigger: Pin 4 of CN5502
(PSIG)
Oscilloscope
C
69
NTSC 2.5 LCD:
A = 2.72 ± 0.05V
NTSC 3.5 LCD:
A = 2.60 ± 0.05V
PAL 2.5 LCD:
A = 3.19 ± 0.05V
Procedure
01 Set the data.
Change the data and set the
voltage (A) between the 100 IRE
and 0 IRE (pedestal) to the
specified value.
(The data should be "00" to "7F".)
Press PAUSE button.
00 Set the data.
2H
Fig. 5-1-23.
6. Center Level Adjustment (PD-160 board)
Set the video signal center level of LCD panel to an appropriate
level.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Note: The data of page: 0, address: 10 must be "00".
Adjusting method:
Order Page Address Data
1 0 01
2 C 6A
3 C 6A
4 0 01
5-38
VTR stop
No signal
Pin 3 of CN5502 (VG)
Digital voltmeter
C
6A
A = 7.00 ± 0.03Vdc
Procedure
01 Set the data.
Change the data and set the DC
voltage (A) to the specified value.
(The data should be "00" to "7F".)
Press PAUSE button.
00 Set the data.