Sony DCR-TRV240 Service Manual page 133

DCR-TRV240/TRV340
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
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.
7. V-COM Adjustment (PD-160 board)
Set the DC bias of the common electrode drive signal of LCD to the
specified value.
If deviated, the LCD display will move, producing flicker and
conspicuous vertical lines.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Note1: This adjustment should be carried out upon completion of the
following adjustments.
RGB AMP Adjustment
Black Limit Adjustment
Contrast Adjustment
Center Level Adjustment
Note2: The data of page: 0, address: 10 must be "00".
Adjusting method:
Order Page Address Data
1 0 01
2 C 63
3 C 63
4 C 63
5 0 01
5-32
VTR stop
No signal
Check on LCD display
C
63
The brightness difference between the
section A and section B is minimum.
Procedure
01 Set the data.
Change the data so that the
brightness of the section A and
that of the section B is equal.
(The data should be "00" to "3F".)
Subtract 2 from the data.
Press PAUSE button.
00 Set the data.
A
B
A
B
B A
A B
Fig. 5-1-21.