Read Sony DSC-S75 (serv.man4) Service Manual online
5-32
5. Bright Adjustment (SY-68 Board)
Set the level of the VIDEO signal for driving the LCD to the speci-
fied value.
If deviated, the LCD screen image will be blackish or saturated
(whitish).
fied value.
If deviated, the LCD screen image will be blackish or saturated
(whitish).
Mode
PLAY
Signal
Arbitrary
Measurement Point
Pin 9 of CN401 (VG)
External trigger: Pin 8 of CN401
(PANEL_COM)
External trigger: Pin 8 of CN401
(PANEL_COM)
Measuring Instrument
Oscilloscope
Adjustment Page
D
Adjustment Address
D0
Specified Value
A = 1.32
±
0.05 Vp-p
A
2H
GAMMA1 limiter level
Pedestal
A: Between the pedestal and GAMMA1
limiter level
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
2
4
10
01
3
4
F1
03
4
D
D0
Change the data and set the
voltage (A) to the specified value.
voltage (A) to the specified value.
5
D
D0
Press PAUSE button.
6
D
D0
Read the data and this data is
named Dref.
named Dref.
7
Convert Dref to decimal
notation, and obtain Dref’.
(Note)
notation, and obtain Dref’.
(Note)
8
Calculate D
CE
’ and D
DE
’ using
following equations.
(decimal calculation)
D
(decimal calculation)
D
CE
’ = Dref’ – 11
D
DE
’ = Dref’ + 24
9
Convert D
CE
’ and D
DE
’ to
hexadecimal numbers, and
obtain D
obtain D
CE
and D
DE
. (Note)
10
D
CE
D
CE
Press PAUSE button.
11
D
DE
D
DE
Press PAUSE button.
Note:
Refer to table 5-2-2. “Hexadecimal-decimal conversion
table”.
table”.
Processing after Completing Adjustment:
Order Page Address Data
Procedure
1
4
F1
00
2
4
10
00
3
0
01
00
Fig. 5-1-21
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