Sony GV-D200 Service Manual page 72

6. COM AMP Adjustment (PD-130 board)
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 ± 0.05Vdc
Adjusting method:
Order Page Address Data
1 0 01 01
2 D A7
3 D A7
4 0 01 00
2H
Fig. 5-3-22.
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.
7. V-COM Adjustment (PD-130 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: Perform "RGB AMP Adjustment", "Contrast Adjustment" and
"COM AMP Adjustment" before this adjustment.
Adjusting method:
Order Page Address Data
1 0 01
2 D A4
3 D A4
4 D A4
5 0 01
A
5-37
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.
Subtract 8 from the data.
Press PAUSE button.
00 Set the data.
B A
A
B
B A
A B
Fig. 5-3-23.