Sony CyberShot DSC-P72 Service Manual page 55

6. Bright Adjustment (SY-85 board)
Set the level of the VIDEO signal for driving the LCD to the specified
value. If deviated, the screen image will be blackish or saturated
(whitish).
Note: Do either of "Adjustment without Using Oscilloscope" or
"Adjustment Using Oscilloscope".
6-1. Adjustment without Using Oscilloscope
Mode PLAY (
Signal Arbitrary
Measurement Point Data of page: 40, address: 11, 12
Measuring Instrument
Adjustment Page 4F
Adjustment Address 85
Specified Value 249 to 252
Adjusting method:
Order Page Address Data
1 00 01 01
2 40 F1 08
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 85
15 4F 85
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 D and D using
A B
following equation.
(Hexadecimal calculation.)
(Note1)
× 4 + D
D = (D / 40)
A 11A 12A
× 4 + D
D = (D / 40)
B 11B 12B
Calculate the signal level using
following equation.
(Hexadecimal calculation.)
When D D
A B
Signal level = D – D
A B
When D < D
A B
Signal level = D – D
B A
When the signal level satisfies the
specified value proceed to step 16,
in case of others proceed to step
14.
Change the data. (Note2)
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
6-2. Adjustment Using Oscilloscope
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 85
5 4F 85
6 4F 02
7 40 F1
8 00 01
Pedestal
6-35
DSC-P72
PLAY ( )
Arbitrary
CL803 (Pin ws of IC801) (VG)
Oscilloscope
4F
85
A = 7.92 ± 0.05V
Procedure
01 Set the data.
08 Write the data.
03 Write the data.
Change the data and set the
voltage (A) between the reversed
waveform pedestal and non-
reversed waveform pedestal to
the specified value.
Write the data.
00 Write the data.
00 Write the data.
00 Set the data.
Pedestal
2H
Fig. 6-1-17.
A