Read Sony DSC-U20 (serv.man4) Service Manual online
DSC-U20
6-24
3.
VG Center Adjustment
Set the center of VG signal for driving the LCD to the specified
value.
value.
Mode
PLAY
Signal
Arbitrary
Measurement Point
Data of page: 50, address: 82, 83,
8A and 8B (2byte data) (Note 1)
8A and 8B (2byte data) (Note 1)
Adjustment Page
4F
Adjustment Address
89
Specified Value
VG = 1FC to 204
Note 1:
2byte data is upper 1byte data and lower 1byte data.
XX XX
Lower 1byte data
(Page: 50, address: 83 or 8B)
Upper 1byte data
(Page: 50, address: 82 or 8A)
(Page: 50, address: 83 or 8B)
Upper 1byte data
(Page: 50, address: 82 or 8A)
Adjusting method:
Order Page Address
Data
Procedure
1
Perform “Data setting
during LCD system
adjustment”
(Refer to page 6-22)
during LCD system
adjustment”
(Refer to page 6-22)
2
40
89
03
[Set]
3
4F
89
33
[Write]
4
50
90
01
[Set]
5
50
90
00
[Set]
6
50
82
[Read]
Read the data
(Upper 1byte).
(Upper 1byte).
7
50
83
[Read]
Read the data
(Lower 1byte).
(Lower 1byte).
8
This 2byte data (Note
1) is named VG1.
1) is named VG1.
9
50
8A
[Read]
Read the data
(Upper 1byte).
(Upper 1byte).
10
50
8B
[Read]
Read the data
(Lower 1byte).
(Lower 1byte).
11
This 2byte data (Note
1) is named VG2.
1) is named VG2.
12
Calculate VG using
following equations.
(hexadecimal calcula-
tion)
following equations.
(hexadecimal calcula-
tion)
VG = (VG1 + VG2)
÷
2
13
Check that the VG
satisfies the specified
value. (Note 2)
satisfies the specified
value. (Note 2)
Note 2:
When VG does not satisfy the specified value, select page:
4F, address: 89, and write the different data (refer to the
following table), then retry the procedure from 4 to 13.
4F, address: 89, and write the different data (refer to the
following table), then retry the procedure from 4 to 13.
VG is smaller than the specified value
Increase the data
VG is larger than the specified value
Decrease the data
Processing after Completing Adjustment:
Order Page Address
Data
Procedure
1
40
89
00
[Set]
2
Release “Data setting
during LCD system
adjustment”
(Refer to page 6-22)
during LCD system
adjustment”
(Refer to page 6-22)
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