Sony DSC-P92 (serv.man4) Service Manual ▷ View online
6-35
DSC-P92
6. Bright Adjustment (SY-93 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).
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 251
Adjusting method:
Order Page Address Data
Procedure
1
00
01
01
Set the data.
2
40
F1
08
Write the data.
3
4F
02
03
Write the data.
4
40
10
00
Write the data.
5
40
10
90
Write the data.
6
40
11
Read the data, and this data is
named D
named D
11A
.
7
40
12
Read the data, and this data is
named D
named D
12A
.
8
40
10
91
Write the data.
9
40
11
Read the data, and this data is
named D
named D
11B
.
10
40
12
Read the data, and this data is
named D
named D
12B
.
11
Calculate D
A
and D
B
using
following equation.
(Hexadecimal calculation.)
(Note1)
(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
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.
specified value proceed to step 16,
in case of others proceed to step
14.
14
4F
85
Change the data. (Note2)
15
4F
85
Write the data, and return to step
4.
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.
6-2. Adjustment Using Oscilloscope
Mode
PLAY (
)
Signal
Arbitrary
Measurement Point
CL803 (Pin ws of IC801) (VG)
Measuring Instrument
Oscilloscope
Adjustment Page
4F
Adjustment Address
85
Specified Value
A = 7.92
±
0.05V
Adjusting method:
Order Page Address Data
Procedure
1
00
01
01
Set the data.
2
40
F1
08
Write the data.
3
4F
02
03
Write the data.
4
4F
85
Change the data and set the
voltage (A) between the reversed
waveform pedestal and non-
reversed waveform pedestal to
the specified value.
voltage (A) between the reversed
waveform pedestal and non-
reversed waveform pedestal to
the specified value.
5
4F
85
Write the data.
6
4F
02
00
Write the data.
7
40
F1
00
Write the data.
8
00
01
00
Set the data.
2H
A
Pedestal
Pedestal
Fig. 6-1-17.
6-36
DSC-P92
7. Contrast Adjustment (SY-93 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).
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”.
7-1. Adjustment without Using Oscilloscope
Mode
PLAY (
)
Signal
Arbitrary
Measurement Point
Data of page: 40, address: 11, 12
Measuring Instrument
Adjustment Page
4F
Adjustment Address
8A
Specified Value
0D6 to 0DE
Adjusting method:
Order Page Address Data
Procedure
1
00
01
01
Set the data.
2
40
F1
01
Write the data.
3
4F
02
03
Write the data.
4
40
10
00
Write the data.
5
40
10
90
Write the data.
6
40
11
Read the data, and this data is
named D
named D
11A
.
7
40
12
Read the data, and this data is
named D
named D
12A
.
8
40
10
91
Write the data.
9
40
11
Read the data, and this data is
named D
named D
11B
.
10
40
12
Read the data, and this data is
named D
named D
12B
.
11
Calculate D
A
and D
B
using
following equation.
(Hexadecimal calculation.)
(Note1)
(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
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.
specified value proceed to step 16,
in case of others proceed to step
14.
14
4F
8A
Change the data. (Note2)
15
4F
8A
Write the data, and return to step
4.
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, decrease the
data. (The data should be “00” to “7F”.)
7-2. Adjustment Using Oscilloscope
Mode
PLAY (
)
Signal
Arbitrary
Measurement Point
CL803 (Pin ws of IC801) (VG)
Measuring Instrument
Oscilloscope
Adjustment Page
4F
Adjustment Address
8A
Specified Value
A = 2.94
±
0.05V
Adjusting method:
Order Page Address Data
Procedure
1
00
01
01
Set the data.
2
40
F1
01
Write the data.
3
4F
02
03
Write the data.
4
4F
8A
Change the data and set the
voltage (A) to the specified
value. (Note)
voltage (A) to the specified
value. (Note)
5
4F
8A
Write the data.
6
4F
02
00
Write the data.
7
40
F1
00
Write the data.
8
00
01
00
Set the data.
Note: The data should be “00” to “7F”.
2H
A
White (100%)
White (100%)
Fig. 6-1-18.
6-37
DSC-P92
8. V COM Adjustment (SY-93 board)
Set the DC bias of the common electrode drive signal of LCD to the
specified value.
If deviated, the LCD display will move, producing flicker and
conspicuous vertical lines.
Set the DC bias of the common electrode drive signal of LCD to the
specified value.
If deviated, the LCD display will move, producing flicker and
conspicuous vertical lines.
Mode
PLAY (
)
Signal
Arbitrary
Measurement Point
Check on LCD display
Measuring Instrument
Adjustment Page
4F
Adjustment Address
84
Specified Value
The brightness difference between the
section A and section B is minimum.
section A and section B is minimum.
Note: Perform “Bright Adjustment” and “Contrast Adjustment” before this
adjustment.
Adjusting method:
Order Page Address Data
Procedure
1
00
01
01
Set the data.
2
40
F1
82
Write the data.
3
4F
02
03
Write the data.
4
4F
84
Change the data so that the
brightness of the section A and
that of the section B is equal.
brightness of the section A and
that of the section B is equal.
5
4F
84
Subtract 2 from the data.
6
4F
84
Write the data.
7
4F
02
00
Write the data.
8
40
F1
00
Write the data.
9
00
01
00
Set the data.
9. White Balance Adjustment (SY-93 board)
Correct the white balance.
If deviated, the LCD screen color cannot be reproduced.
Correct the white balance.
If deviated, the LCD screen color cannot be reproduced.
Mode
PLAY (
)
Subject
Arbitrary
Measurement Point
Check on LCD display
Measuring Instrument
Adjustment Page
4F
Adjustment Address
88, 89
Specified Value
The LCD screen should not be colored.
Note1: Use the AC power adaptor during this adjustment.
Note2: Check the white balance only when replacing the following parts.
Note2: Check the white balance only when replacing the following parts.
If necessary, adjust them.
1. LCD panel
2. Light induction plate
3. IC801
2. Light induction plate
3. IC801
Adjusting method:
Order Page Address Data
Procedure
1
00
01
01
Set the data.
2
40
F1
0A
Write the data.
3
4F
88
8E
Write the data.
4
4F
89
77
Write the data.
5
4F
88
Check that the LCD screen is
not colored. If not colored,
proceed to step 11.
not colored. If not colored,
proceed to step 11.
6
4F
88
Change the data so that the LCD
screen is not colored.
screen is not colored.
7
4F
88
Write the data.
8
4F
89
Change the data so that the LCD
screen is not colored.
screen is not colored.
9
4F
89
Write the data.
10
4F
89
If the LCD screen is colored,
repeat steps 6 to 10.
repeat steps 6 to 10.
11
40
F1
00
Write the data.
12
00
01
00
Set the data.
Fig. 6-1-19.
A
A
A
A
B
B
B
B
6-38
DSC-P92
1-6.
SYSTEM CONTROL SYSTEM ADJUSTMENT
1. Battery End Check (SY-93 board)
Check the battery end voltage.
Check the battery end voltage.
Mode
STILL (
)
Subject
Arbitrary
Measurement Point
Data of page: 20, address: 9B
Measuring Instrument
Specified Value
56 to 60
Switch setting:
FOCUS (Menu setting) ................................................... 0.5m
Connection:
1)
1)
Connect the regulated power supply and the digital voltmeter
to the battery terminal as shown in Fig. 6-1-20.
to the battery terminal as shown in Fig. 6-1-20.
Preparations:
1)
1)
Adjust the output voltage of the regulated power supply so that
the digital voltmeter display is 4.2
the digital voltmeter display is 4.2
±
0.1Vdc.
Checking method:
Order Page Address Data
Procedure
1
Decrease the output voltage of
the regulated power supply so
that the digital voltmeter display
is 2.20
the regulated power supply so
that the digital voltmeter display
is 2.20
±
0.01Vdc.
2
20
9B
Read the data, and check it
satisfies the specified value.
satisfies the specified value.
Regulated power supply
Digital voltmeter
Fig. 6-1-20.
COVER
COVER
Click on the first or last page to see other DSC-P92 (serv.man4) service manuals if exist.