V-Com Adjustment (Pd-126 Board); White Balance Adjustment (Pd-126 Board) - Sony DCR-VX2000 Service Manual

6. V-COM Adjustment (PD-126 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 VTR stop
Signal No signal
Measurement Point Check on LCD display
Measuring Instrument
Adjustment Page D
Adjustment Address A4
Specified Value The brightness difference between the
section A and section B is minimum.
Note: Perform "Bright Adjustment", "Black Limit Adjustment", "Contrast
Adjustment" and "Center Level Adjustment" before this adjustment.
Adjusting method:
Order Page Address Data
1 0 01 01
2 D B0
3 D B0 CA
4 D A4
5 D A4
6 D A4
7 D B0
8 D B0
9 0 01 00
B
A
B
A
Fig. 5-1-24.
Procedure
Set the data.
Write down the data.
Set the data, and press PAUSE
button.
Change the data so that the
brightness of the section A and
that of the section B is equal.
(The data should be "80" to
"BF".)
Subtract 2 from the data.
Press PAUSE button.
Write the data that was written
down in the step 2.
Press PAUSE button.
Set the data.
A
B
A
B

7. White Balance Adjustment (PD-126 board)

Correct the white balance.
If deviated, the reproduction of the LCD screen may degenerate.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Note1: Check the white balance only when replacing the following parts.
If necessary, adjust them.
1. LCD panel
2. Light induction plate
3. IC2101
Note2: Use the AC power adaptor.
Adjusting method:
Order Page Address Data
1 0 01
2 D A8
3 D A9
4 D A9
5 D A8
6 D A8
7 D A9
8 D A9
9 D A9
10 0 01
5-36
VTR stop
No signal
Check on LCD screen
D
A8, A9
The LCD screen should not be
colored.
Procedure
01 Set the data.
85 Set the data, and press PAUSE
button.
75 Set the data, and press PAUSE
button.
Check that the LCD screen is
not colored. If not colored,
proceed to step 10.
Change the data so that the LCD
screen is not colored.
Press PAUSE button.
Change the data so that the LCD
screen is not colored.
Press PAUSE button.
If the LCD screen is colored,
repeat steps 5 to 9.
00 Set the data.