Contrast Adjustment (Vf-141 Board) - Sony MVC-FD97 Service Manual

4. Contrast Adjustment (VF-141 board)

Set the level of the VIDEO signal for driving the LCD to the speci-
fied value. If deviated, the screen image will be blackish or satu-
rated (whitish).
Mode CAMERA
Subject Arbitrary
Pin wa of CN803 (EVF_VG) on
Measurement Point
FC-85 board
Measuring Instrument Oscilloscope
Adjustment Page D
CA (NTSC)
Adjustment Address
CC (PAL )
A = 2.12 ± 0.1 Vp-p
Specified Value
Menu setting:
1) VIDEO OUT of SET UP menu
.................................. NTSC (NTSC mode)
(This adjustment must be performed in NTSC mode, so don't
set the menu setting to "PAL" )
Adjusting method (NTSC):
Order Page Address Data
1 0 01 01
2 5 F1 03
3 D CA
4 D CA
Adjusting method (PAL):
Order Page Address Data
1 0 01 01
2 5 F1 03
3 D CA
4 D CA
5
6
7
8 D CC D
CA
Note: Refer to table 5-2-2. "Hexadecimal-decimal conversion
table".
Processing after Completing Adjustment:
Order Page Address Data
1 5 F1 00
2 0 01 00
Procedure
Change the data and set the
voltage (A) to the specified value.
Press PAUSE button.
Procedure
Change the data and set the
voltage (A) to the specified value.
Read the data and this data is
named D .
CA
Convert Dref to decimal notation
and obtain D '. (Note)
CA
Calculate using following equations
(decimal calculation).
D '= D '– 4
CA ref
Convert D ' to a hexadecimal
CA
number, and obtain D . (Note)
CA
Press PAUSE button.
Procedure
A
A: Between the pedestal and 10 steps peak
5-40
10 steps peak
Pedestal
2H
Fig. 5-1-27