Psig Gray Adjustment (Sw-368 Board); V-Com Adjustment (Sw-368 Board) - Sony Cyber-shot DSC-P2 Service Manual

7. PSIG Gray Adjustment (SW-368 Board)

Set the common electrode drive signal level of LCD to the speci-
fied value.
Mode PLAY
Signal Arbitrary
Measurement Point Pin 8 of CN706 on SY-77 board
(PANEL COM)
Measuring Instrument Oscilloscope
Adjustment Page A
Adjustment Address 87
A = 5.0 ± 0.1 Vp-p
Specified Value
Adjusting method:
Order Page Address Data
1 0 01 01
2 A 02 03
3 4 F1 02
4 A 87
5 A 87
Note: Adjust it between data 00 and 7F.
Processing after Completing Adjustment:
Order Page Address Data
1 A 02 00
2 4 F1 00
3 0 01 00
Fig. 5-1-22
Procedure
Press PAUSE button
Change the data and set the PSIG
signal level (A) to the specified
value. (Note)
Press PAUSE button.
Procedure
Press PAUSE button
2H

8. V-COM Adjustment (SW-368 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
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Note 1: Perform "Bright Adjustment" and "Contrast Adjustment"
before this adjustment.
Adjusting method:
Order Page Address Data
1 0 01
2 A 02
3 4 F1
4 A 84
5 A 84
6
7
8
A
9 A 84
Note 2: Refer to table 5-2-2. "Hexadecimal-decimal conversion
table".
Note 3: Adjust it between data 00 and 3F.
Processing after Completing Adjustments:
Order Page Address Data
1 A 02
2 4 F1
3 0 01
5-37
PLAY
Arbitrary
Check on the LCD screen
A
84
The brightness difference
between the section-A and
section-B is minimum
Procedure
01
03 Press PAUSE button
82
Change the data so that
brightness of the section A
and section B is equal.
Read the data and this data is
named Dref.
Convert Dref to decimal
notation, and obtain Dref'.
(Note 2)
Calculate D ' using
84
following equations.
(decimal calculation)
D ' = Dref' – 02
84
Convert D ' to a hexadeci-
84
mal number, and obtain D
(Note 2)
D Press PAUSE button. (Note 3)
84
Procedure
00 Press PAUSE buttton
00
00
A
B
A
B
B A
A
B
Fig. 5-1-23
DSC-P2
.
84