Sony DCR-TRV738E Service Manual page 120

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.
Note2: NTSC model: DCR-TRV740/TRV840
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.
Mode
Subject
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Note: The data of page: 0, address: 10 must be "00".
Adjusting method:
Order Page Address Data
1 0 01
2 F 10
3 F 10
4 0 01
VC-278 board
36 25
37
48
1 12
Camera
Not required
Pin qh of IC1502
Frequency counter
F
10
f = 33000000 ± 166Hz (NTSC)
f = 27000000 ± 134Hz (APL)
Procedure
01 Set the data.
Change the data and set the
frequency (f) to the specified
value.
Press PAUSE button.
00 Set the data.
24
IC1502
13
2. S VIDEO OUT Y Level Adjustment (VC-278 board)
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Note1: The data of page: 0, address: 10 must be "00".
Adjusting method:
Order Page Address Data
1 0 01
2 A 12
3 3 0C
4 C 25
5 C 25
6 3 0C
7 A 12
8 0 01
5-54
VTR stop
No signal
Y signal terminal of S VIDEO jack
(75Ω terminated)
Oscilloscope
C
25
A = 1000 ± 20mV
Procedure
01 Set the data.
10 Set the data, and press PAUSE
button.
02 Set the data, and press PAUSE
button.
Change the data and set the Y
signal level (A) to the specified
value.
Press PAUSE button.
00 Set the data, and press PAUSE
button.
00 Set the data, and press PAUSE
button.
00 Set the data.
Center of luminance line
H
Fig. 5-3-7.
A