Sony FD Mavica MVC-FD75, Service Manual

Page: 71 / 90

5-20
7. V-COM Adjustment (PK-59 Board)
This adjustment corrects the DC bias of common electrode drive
signals of the LCD panel. If shifted, the LCD screen will be coarse,
or flicker, or vertical streaks will appear.
Mode PLAY
Signal Alignment disk: 50% white
signal
Measurement Point
Check on the LCD screen
Measuring Instrument
Adjustment Page F
Adjustment Address 37
Specified Value The brightness difference
between the section A and B is
minimum.
Note: “Contrast Adjustment” and “Bright Adjustment” must be
already finished.
Adjusting method:
Order Page Address Data Procedure
1 0 01 01
2 3 02 01
3 3 18 10 Press PAUSE button.
4 F 37 Change the data so that the
brightness of the section A
and section B is equal.
5 F 37 Press PAUSE button.
Processing after Completing Adjustment:
Order Page Address Data Procedure
1 3 18 00 Press PAUSE button.
2 3 02 00
3 0 01 00
8. White Blance Adjustment (PK-59 Board)
This adjustment corrects the white balance.
If disordered, the colors on the LCD screen will not be reproduced.
correctly.
Mode PLAY
Signal Alignment disk: 50% white
signal (with burst)
Measurement Point
Check on the LCD screen
Measuring Instrument
Adjustment Page F
Adjustment Address 33, 34
Specified Value LCD screen must not be colored
Note: Check the white balance only when replacing the following
parts. If necessary, adjust them.
1. LCD panel
2. Light induction plate
3. IC802
Adjusting method:
Order Page Address Data Procedure
1 0 01 01
2 3 02 01
3 3 17 01 Press PAUSE button.
4 3 18 00 Press PAUSE button.
5 F E0 15 Press PAUSE button.
6 F 33 Change the data and so that
34 the LCD screen is not
colored.
7 F 33 Press PAUSE button.
34
Processing after Completing Adjustment:
Order Page Address Data Procedure
1 F E0 1B Press PAUSE button.
2 3 17 00 Press PAUSE button.
3 3 02 00
4 0 01 00
A
A
A
A
B
B
B
B
Fig. 5-1-19