Sony CD Mavica MVC-CD250, Service Manual

Page: 97 / 125

5-41
MVC-CD250/CD400
7. V-COM Level Adjustment (PK-65/66 Board)
Set the common electrode drive signal level of LCD to the speci-
fied value.
Mode PLAY
Signal Arbitrary
Measurement Point Pin
8
of CN714 on SY-76 board
(PANEL_COM)
Measuring Instrument Oscilloscope
Adjustment Page A
Adjustment Address 87
Specified Value A = 6.14 ± 0.05 Vp-p
(MVC-CD400)
A = 5.42
±
0.05 Vp-p
(MVC-CD250)
Adjusting method:
Order Page Address Data Procedure
1 0 01 01
2 A 02 03 Press PAUSE button.
3 4 F1 03
4 A 87
Change the data and set the
voltage (A) to the specified
value.
5 A 87 Press PAUSE button.
Processing after Completing Adjustments:
Order Page Address Data Procedure
1 A 02 00 Press PAUSE button.
2 4 F1 00
3 0 01 00
Fig. 5-1-21
A
2H
8. V-COM Adjustment (PK-65/66 Board)
Set the DC bias of the common electrode drive signal of LCD to
the specified value.
If deviated, the LCD display will be move, producing flicker and
conspicuous vertical lines.
Mode PLAY
Signal Arbitrary
Measurement Point Check on LCD screen
Measuring Instrument
Adjustment Page A
Adjustment Address 84
Specified Value The brightness difference between
the section-A and section-B is
minimum
Note:
Perform “Contrast Adjustment” before this adjustment.
Adjusting method:
Order Page Address Data Procedure
1 0 01 01
2 A 02 03 Press PAUSE button.
3 4 F1 82
4 A 84
Change the data so that
brightness of the section A
and section B is equal.
5 A 84 Press PAUSE button.
Processing after Completing Adjustments:
Order Page Address Data Procedure
1 A 02 00 Press PAUSE button.
2 4 F1 00
3 0 01 00
Fig. 5-1-22
A
A
A
A
B
B
B
B