Read Sony DSC-U20 (serv.man4) Service Manual online
DSC-U20
6-27
6.
PSIG Adjustment
Set the amplitude of the pre-charge pulse for driving the LCD to
the specified value.
the specified value.
Mode
PLAY
Signal
Arbitrary
Measurement Point
Data of page: 50, address: 86, 87,
8E and 8F (2byte data) (Note 1)
8E and 8F (2byte data) (Note 1)
Adjustment Page
4F
Adjustment Address
85
Specified Value
VP = 14C to 154
Note 1:
2byte data is upper 1byte data and lower 1byte data.
XX XX
Lower 1byte data
(Page: 50, address: 87 or 8F)
Upper 1byte data
(Page: 50, address: 86 or 8E)
(Page: 50, address: 87 or 8F)
Upper 1byte data
(Page: 50, address: 86 or 8E)
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
85
38
[Write]
4
50
90
01
[Set]
5
50
90
00
[Set]
6
50
86
[Read]
Read the data
(Upper 1byte).
(Upper 1byte).
7
50
87
[Read]
Read the data
(Lower 1byte).
(Lower 1byte).
8
This 2byte data (Note
1) is named VP1.
1) is named VP1.
9
50
8E
[Read]
Read the data
(Upper 1byte).
(Upper 1byte).
10
50
8F
[Read]
Read the data
(Lower 1byte).
(Lower 1byte).
11
This 2byte data (Note
1) is named VP2.
1) is named VP2.
12
Calculate VP using
following equations.
(hexadecimal calcula-
tion)
following equations.
(hexadecimal calcula-
tion)
VP = VP1 – VP2
(VP: absolute value)
13
Check that the VP
satisfies the specified
value. (Note 2)
satisfies the specified
value. (Note 2)
Note 2:
When VP does not satisfy the specified value, select page:
4F, address: 85, and write the different data (refer to the
following table), then retry the procedure from 4 to 13.
4F, address: 85, and write the different data (refer to the
following table), then retry the procedure from 4 to 13.
VP is smaller than the specified value
Increase the data
VP 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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