Sony DCR-TRV230E Service Manual page 175

9. COM AMP Adjustment (PD-138 board)
(DCR-TRV430E)
Set the common electrode drive signal level of LCD to the specified
value.
Mode VTR stop
Signal No signal
Measurement Point Pin 4 of CN5502 (PANEL COM)
Measuring Instrument Oscilloscope
Adjustment Page D
Adjustment Address A7
Specified Value A = 6.33 ± 0.05V
Adjusting method:
Order Page Address Data
1 0 01 01
2 D A7
3 D A7
4 0 01 00
2H
Fig. 5-1-23.
Procedure
Set the data.
Change the data and set the
PANEL COM signal level (A) to
the specified value.
Press PAUSE button.
Set the data.
10. V-COM Adjustment (PD-138/139 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
Note: This adjustment should be carried out upon completion of the
following adjustments.
[PD-138 board]
RGB AMP Adjustment
Contrast Adjustment
COM AMP Adjustment
[PD-139 board]
RGB AMP Adjustment
Black Limit Adjustment
Contrast Adjustment
Center Level Adjustment
Adjusting method:
Order Page Address Data
1 0 01
A
2 D A4
3 D A4
4 D A4
5 0 01
5-34
VTR stop
No signal
Check on LCD display
D
A4
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.
[PD-138 board]
The data should be "00" to "FF".
[PD-139 board]
The data should be "00" to "3F".
[PD-138 board]
Subtract 8 from the data.
[PD-139 board]
Subtract 2 from the data.
Press PAUSE button.
00 Set the data.
A
B
A
B
B A
A B
Fig. 5-1-24.