Sony DCR-TRV25 / DCR-TRV27 Service Manual ▷ View online
5-33
DCR-TRV25/TRV27
2. RGB AMP Adjustment (VA-117 board)
Set the D range of the RGB driver used to drive the LCD to the
specified value. If deviated, the LCD screen will become blackish
or saturated (whitish).
specified value. If deviated, the LCD screen will become blackish
or saturated (whitish).
Mode
Camera
Subject
Arbitrary
Measurement Point
Pin 4 of CN1002 of VC-281 board
(EVF VG)
(EVF VG)
Measuring Instrument
Oscilloscope
Adjustment Page
C
Adjustment Address
54
Specified Value
A = 7.20 ± 0.10V
Note:
The data of page: 0, address: 10 must be “00”.
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
Set the data.
2
C
54
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.
3
C
54
Press PAUSE button.
4
0
01
00
Set the data.
3. Contrast Adjustment (VA-117 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).
value. If deviated, the screen image will be blackish or saturated
(whitish).
Mode
Camera
Subject
Arbitrary
Measurement Point
Pin 4 of CN1002 of VC-281 board
(EVF VG)
(EVF VG)
Measuring Instrument
Oscilloscope
Adjustment Page
C
Adjustment Address
58
Specified Value
A = 2.52 ± 0.10V
Note:
The data of page: 0, address: 10 must be “00”.
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
Set the data.
2
C
58
Change the data and set the
voltage (A) between the 100 IRE
and 0 IRE (pedestal) to the
specified value. (The data should
be “00” to “7F”.)
voltage (A) between the 100 IRE
and 0 IRE (pedestal) to the
specified value. (The data should
be “00” to “7F”.)
3
C
58
Press PAUSE button.
4
0
01
00
Set the data.
Pedestal
Pedestal
A
2H
3 steps peak
Pedestal
A
2H
Fig. 5-1-15.
Fig. 5-1-16.
5-34
DCR-TRV25/TRV27
4. White Balance Adjustment (VA-117 board)
Correct the white balance.
If deviated, the reproduction of the EVF screen may degenerate.
If deviated, the reproduction of the EVF screen may degenerate.
Mode
Camera
Subject
Arbitrary
Measurement Point
Check on EVF screen
Measuring Instrument
Adjustment Page
C
Adjustment Address
56, 57
Specified Value
The EVF screen should not be colored.
Note1:
Check the white balance only when replacing the following parts.
If necessary, adjust them.
1. LCD panel
2. Light induction plate
3. IC4201
If necessary, adjust them.
1. LCD panel
2. Light induction plate
3. IC4201
Note2:
The data of page: 0, address: 10 must be “00”.
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
Set the data.
2
C
56
80
Set the data, and press PAUSE
button.
button.
3
C
57
80
Set the data, and press PAUSE
button.
button.
4
C
57
Check that the EVF screen is not
colored. If not colored, proceed to
step 10.
colored. If not colored, proceed to
step 10.
5
C
56
Change the data so that the EVF
screen is not colored.
screen is not colored.
6
C
56
Press PAUSE button.
7
C
57
Change the data so that the EVF
screen is not colored.
screen is not colored.
8
C
57
Press PAUSE button.
9
C
57
If the EVF screen is colored,
repeat steps 5 to 9.
repeat steps 5 to 9.
10
0
01
00
Set the data.
5-35
DCR-TRV25/TRV27
1-5.
LCD SYSTEM ADJUSTMENT
Note1:
The back light (fluorescent tube) is driven by a high voltage AC
power supply. Therefore, do not touch the back light holder to
avoid electrical shock.
power supply. Therefore, do not touch the back light holder to
avoid electrical shock.
Note2:
When replacing the LCD unit, be careful to prevent damages
caused by static electricity.
caused by static electricity.
Note3:
Before performing the adjustments, check the data of page: 0,
address: 10 is “00”. If not, set data: 00 to this address.
address: 10 is “00”. If not, set data: 00 to this address.
Switch setting:
LCD BRIGHT(Menu setting) ............................................. Center.
LCD BRIGHT(Menu setting) ............................................. Center.
[Adjusting connector]
Most of the measuring points for adjusting the LCD system are
concentrated in CN1002 of the VC-281 board. Connect the
measuring instruments via the multi CPC-8 jig (J-6082-388-A). The
following table shows the Pin No. and signal name of CN1002.
Most of the measuring points for adjusting the LCD system are
concentrated in CN1002 of the VC-281 board. Connect the
measuring instruments via the multi CPC-8 jig (J-6082-388-A). The
following table shows the Pin No. and signal name of CN1002.
Table 5-1-14.
1. VCO Adjustment (PD-161 board)
Set the VCO free-run frequency. If deviated, the LCD screen will
be blurred.
be blurred.
Mode
VTR stop
Signal
No signal
Measurement Point
Pin 9 of CN1002 of VC-281 board
(H START)
(H START)
Measuring Instrument
Frequency counter
Adjustment Page
C
Adjustment Address
61, 62
Specified Value
f = 15734 ± 30Hz
Note1:
The data of page: 0, address: 10 must be “00”.
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
Set the data.
2
C
61
Change the data and set the VCO
frequency (f) to the specified
value.
frequency (f) to the specified
value.
3
C
61
Press PAUSE button.
4
C
61
Read the data, and this data is
named D
named D
61
.
5
Convert D
61
to decimal notation,
and obtain D
61
’. (Note2)
6
Calculate D
62
’ using following
equations (Decimal calculation)
[DCR-TRV25]
[DCR-TRV25]
When D
61
’ 229
D
62
’ = D
61
’ + 26
When D
61
’ > 229
D
62
’ = 255
[DCR-TRV27]
When D
61
’ 246
D
62
’ = D
61
’ + 9
When D
61
’ > 246
D
62
’ = 255
7
Convert D
62
’ to a hexadecimal
number, and obtain D
62
. (Note2)
8
C
62
D
62
Set the data, and press PAUSE
button.
button.
9
0
01
00
Set the data.
Note2:
Refer to “Table 5-4-1. Hexadecimal-decimal Conversion Table”.
Pin No.
1
3
5
7
9
11
13
15
17
19
Signal Name
LANC SIG
N.C.
EVF VCO
PANEL VG
H START
PANEL COM
N.C.
N.C.
SWP
GND
Pin No
.
2
4
6
8
10
12
14
16
18
20
Signal Name
N.C.
EVF VG
GND
PD VCO
XHD/PSIG
TMS (MAKER CHECK)
N.C.
GND
RF IN/LANC JACK IN
RF MON
CN1002
1
2
19
20
Remove the
CPC lid.
CPC lid.
Fig. 5-1-17.
5-36
DCR-TRV25/TRV27
2. RGB AMP Adjustment (PD-161 board)
Set the D range of the RGB decoder used to drive the LCD to the
specified value. If deviated, the LCD screen will become blackish
or saturated (whitish).
specified value. If deviated, the LCD screen will become blackish
or saturated (whitish).
Mode
VTR stop
Signal
No signal
Measurement Point
Pin 7 of CN1002 of VC-281 board
(PANEL VG)
Ext. trigger: Pin qa of CN1002 of VC-
281 board (PANEL COM)
(PANEL VG)
Ext. trigger: Pin qa of CN1002 of VC-
281 board (PANEL COM)
Measuring Instrument
Oscilloscope
Adjustment Page
C
Adjustment Address
64
Specified Value
A = 3.52 ± 0.05V (TRV25)
A = 3.66 ± 0.05V (TRV27)
A = 3.66 ± 0.05V (TRV27)
Note:
The data of page: 0, address: 10 must be “00”.
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
Set the data.
2
C
64
Change the data and set the
voltage (A) between the reversed
waveform pedestal and non-
reversed waveform pedestal to the
specified value. (The data should
be “00” to “3F”.)
voltage (A) between the reversed
waveform pedestal and non-
reversed waveform pedestal to the
specified value. (The data should
be “00” to “3F”.)
3
C
64
Press PAUSE button.
4
0
01
00
Set the data.
3. Contrast Adjustment (PD-161 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).
value. If deviated, the screen image will be blackish or saturated
(whitish).
Mode
VTR stop
Signal
No signal
Measurement Point
Pin 7 of CN1002 of VC-281 board
(PANEL VG)
Ext. trigger: Pin qa of CN1002 of VC-
281 board (PANEL COM)
(PANEL VG)
Ext. trigger: Pin qa of CN1002 of VC-
281 board (PANEL COM)
Measuring Instrument
Oscilloscope
Adjustment Page
C
Adjustment Address
69
Specified Value
A = 3.00 ± 0.05V (TRV25)
A = 3.28 ± 0.05V (TRV27)
A = 3.28 ± 0.05V (TRV27)
Note:
The data of page: 0, address: 10 must be “00”.
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
Set the data.
2
C
69
Change the data and set the
voltage (A) between the 100 IRE
and 0 IRE (pedestal) to the
specified value. (The data should
be “00” to “7F”.)
voltage (A) between the 100 IRE
and 0 IRE (pedestal) to the
specified value. (The data should
be “00” to “7F”.)
3
C
69
Press PAUSE button.
4
0
01
00
Set the data.
Fig. 5-1-18.
Pedestal
Pedestal
A
2H
100 IRE
Pedestal
A
2H
Fig. 5-1-19.
