Sony DCR-TRV725E Service Manual page 166

3-4. VIDEO SYSTEM ADJUSTMENTS
1. 54/66MHz Origin Oscillation Adjustment
(VC-262 board)
Set the frequency of the clock for synchronization.
If deviated, the synchronization will be disrupted and the color will
become inconsistent.
Mode Camera
Subject Not required
Measurement Point Pin qh of IC1503
Measuring Instrument Frequency counter
Adjustment Page A
Adjustment Address 12
Specified Value f=33000000 ± 166Hz (NTSC)
f=27000000 ± 134Hz (PAL)
Adjusting method:
Order Page Address Data
1 0 01 01
2 A 12
3 A 12
4 0 01 00
24 13
25 12
36 1
37 48
VC-262 board
Fig. 5-3-8.
Procedure
Set the data.
Change the data and set the
frequency (f) to the specified
value.
Press PAUSE button.
Set the data.
IC1503
2. Chroma BPF fo Adjustment (VC-262 board)
Set the center frequency of IC3701 chroma band-pass filter.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Adjusting method:
Order Page Address Data
1 0 01
2 D 11
3
4 3 0C
5 C 28
6 C 28
7 3 0C
8
9 D 11
10 0 01
When the data of page: 3, address: 0C, is 04:
A
CH1
CH2
When the data of page: 3, address: 0C, is 00:
CH1
5-51
VTR stop
No signal
CH1: Chroma signal terminal of S
VIDEO OUT jack (75Ω terminated)
CH2: Y signal terminal of S VIDEO
OUT jack (75Ω terminated)
Oscilloscope
C
28
A = 100mVp-p or less
B = 200mVp-p or more
Procedure
01 Set the data.
10 Set the data, and press PAUSE
button.
Check that the burst signal (B) is
output to the chroma signal
terminal of S VIDEO OUT jack.
04 Set the data, and press PAUSE
button.
Change the data for minimum
amplitude of the burst signal
level (A).
(The data should be "00" to "07".)
Press PAUSE button.
00 Set the data, and press PAUSE
button.
Check that the burst signal level
(B) satisfies the specified value.
00 Set the data, and press PAUSE
button.
00 Set the data.
H
H
Fig. 5-3-9.
B