Sony Cyber-Shot DSC-P72, Service Manual

Page: 54 / 74

6-34
DSC-P72
5. PSIG Level Adjustment (SY-85 board)
Set the PSIG signal level to an appropriate level.
Note:
Do either of “Adjustment without Using Oscilloscope” or
“Adjustment Using Oscilloscope”.
5-1. Adjustment without Using Oscilloscope
Mode PLAY ( )
Signal Arbitrary
Measurement Point Data of page: 40, address: 11, 12
Measuring Instrument
Adjustment Page 4F
Adjustment Address 87
Specified Value 170 to 178
Adjusting method:
Order Page Address Data Procedure
1 00 01 01 Set the data.
2 40 F1 02 Write the data.
3 4F 02 03 Write the data.
4 40 10 00 Write the data.
5 40 10 80 Write the data.
6 40 11 Read the data, and this data is
named D
11A
.
7 40 12 Read the data, and this data is
named D
12A
.
8 40 10 81 Write the data.
9 40 11 Read the data, and this data is
named D
11B
.
10 40 12 Read the data, and this data is
named D
12B
.
11 Calculate D
A
and D
B
using
following equation.
(Hexadecimal calculation.)
(Note1)
D
A
= (D
11A
×
4+ D
12A
/ 40)
D
B
= (D
11B
×
4+ D
12B
/ 40)
12 Calculate the signal level using
following equation.
(Hexadecimal calculation.)
When D
A
D
B
Signal level = D
A
- D
B
When D
A
< D
B
Signal level = D
B
- D
A
13 When the signal level satisfies the
specified value proceed to step 16,
in case of others proceed to step
14.
14 4F 87 Change the data. (Note2)
15 4F 87 Write the data, and return to step
4.
16 4F 02 00 Write the data.
17 40 F1 00 Write the data.
18 00 01 00 Set the data.
Note1: When dividing D
12A
or D
12B
by 40. If there is a fraction below
decimal point, truncate it.
Note2: When the signal level is smaller than specified value, increase the
data.
5-2. Adjustment Using Oscilloscope
Mode PLAY ( )
Signal Arbitrary
Measurement Point CL804 (Pin
ws
of CN702) (VCOM)
Measuring Instrument Oscilloscope
Adjustment Page 4F
Adjustment Address 87
Specified Value A = 5.00 ± 0.05V
Adjusting method:
Order Page Address Data Procedure
1 00 01 01 Set the data.
2 40 F1 02 Write the data.
3 4F 02 03 Write the data.
4 4F 87 Change the data and set the
signal level (A) to the specified
value.
5 4F 87 Write the data.
6 4F 02 00 Write the data.
7 40 F1 00 Write the data.
8 00 01 00 Set the data.
A
2H
Fig. 6-1-16.