Read Sony DCR-TRV738E / DCR-TRV740 / DCR-TRV740E / DCR-TRV840 (serv.man2) Service Manual online
5-54
DCR-TRV738E/TRV740/TRV740E/TRV840
3-4.
VIDEO SYSTEM ADJUSTMENTS
Note1:
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.
Note2:
NTSC model: DCR-TRV740/TRV840
PAL model: DCR-TRV738E/TRV740E
PAL model: DCR-TRV738E/TRV740E
1. 54MHz/66MHz Origin Oscillation Adjustment
(VC-278 board)
Set the frequency of the clock for synchronization.
If deviated, the synchronization will be disrupted and the color will
become inconsistent.
If deviated, the synchronization will be disrupted and the color will
become inconsistent.
Mode
Camera
Subject
Not required
Measurement Point
Pin qh of IC1502
Measuring Instrument
Frequency counter
Adjustment Page
F
Adjustment Address
10
Specified Value
f = 33000000 ± 166Hz (NTSC)
f = 27000000 ± 134Hz (APL)
f = 27000000 ± 134Hz (APL)
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
F
10
Change the data and set the
frequency (f) to the specified
value.
frequency (f) to the specified
value.
3
F
10
Press PAUSE button.
4
0
01
00
Set the data.
2. S VIDEO OUT Y Level Adjustment (VC-278 board)
Mode
VTR stop
Signal
No signal
Measurement Point
Y signal terminal of S VIDEO jack
(75
(75
Ω terminated)
Measuring Instrument
Oscilloscope
Adjustment Page
C
Adjustment Address
25
Specified Value
A = 1000 ± 20mV
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
A
12
10
Set the data, and press PAUSE
button.
button.
3
3
0C
02
Set the data, and press PAUSE
button.
button.
4
C
25
Change the data and set the Y
signal level (A) to the specified
value.
signal level (A) to the specified
value.
5
C
25
Press PAUSE button.
6
3
0C
00
Set the data, and press PAUSE
button.
button.
7
A
12
00
Set the data, and press PAUSE
button.
button.
8
0
01
00
Set the data.
VC-278 board
IC1502
37
48
24
36 25
1
12
13
Fig. 5-3-7.
H
Center of luminance line
A
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