Sony CyberShot DSC-P72 Service Manual page 53

4. VG Center Adjustment (SY-85 board)
Set the VG signal center level of LCD panel to an appropriate level.
Note: Do either of "Adjustment without Using Digital Voltmeter" or
"Adjustment Using Digital Voltmeter".
4-1. Adjustment without Using Digital Voltmeter
Mode PLAY (
Signal Arbitrary
Measurement Point Data of page: 40, address: 11, 12
Measuring Instrument
Adjustment Page 4F
Adjustment Address 8B
Specified Value 205 to 20D
Adjusting method:
Order Page Address Data
1 00 01 01
2 40 F1 01
3 4F 02 03
4 40 10 00
5 40 10 90
6 40 11
7 40 12
8 40 10 91
9 40 11
10 40 12
11
12
13
14 4F 8B
15 4F 8B
16 4F 02 00
17 40 F1 00
18 00 01 00
Note1: When dividing D or D
12A
decimal point, truncate it.
Note2: When the signal level is smaller than specified value, increase the
data.
)
Procedure
Set the data.
Write the data.
Write the data.
Write the data.
Write the data.
Read the data, and this data is
named D .
11A
Read the data, and this data is
named D .
12A
Write the data.
Read the data, and this data is
named D .
11B
Read the data, and this data is
named D .
12B
Calculate DA and DB using
following equation.
(Hexadecimal calculation.)
(Note1)
× 4+ D
DA = (D / 40)
11A 12A
× 4+ D
DB = (D / 40)
11B 12B
Calculate the signal level using
following equation.
(Hexadecimal calculation.)
Signal level = (D + D ) / 2
A B
When the signal level satisfies
the specified value proceed to
step 16, in case of others
proceed to step 14.
Change the data. (Note2)
(The data should be "00" to
"7F".)
Write the data, and return to step
4.
write the data.
Write the data.
Set the data.
by 40. If there is a fraction below
12B
4-2. Adjustment Using Digital Voltmeter
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Adjusting method:
Order Page Address Data
1 00 01
2 40 F1
3 4F 02
4 4F 8B
5 4F 8B
6 4F 02
7 40 F1
8 00 01
6-33
DSC-P72
PLAY ( )
Arbitrary
CL803 (Pin ws of IC801) (VG)
Digital voltmeter
4F
8B
A = 7.00 ± 0.05V
Procedure
01 Set the data.
01 Write the data.
03 Write the data.
Change the data and set the DC
voltage (A) to the specified value.
(The data should be "00" to "7F".)
Write the data.
00 Write the data.
00 Write the data.
00 Set the data.