Sony HANDYCAM DCR-TRV230, Service Manual

Page: 180 / 248

5-49
3-4. VIDEO SYSTEM ADJUSTMENTS
1. 27MHz Origin Oscillation Adjustment
(VC-254 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 IC1502
Measuring Instrument Frequency counter
Adjustment Page F
Adjustment Address 4D
Specified Value f=13500000 ± 68Hz
Adjusting method:
Order Page Address Data Procedure
1 0 01 01 Set the data.
2 F 4D Change the data and set the
frequency (f) to the specified
value.
3 F 4D Press PAUSE button.
4 0 01 00 Set the data.
2. Chroma BPF fo Adjustment (VC-254 board)
Set the center frequency of IC3701 chroma band-pass filter.
Mode VTR stop
Signal No signal
Measurement Point CH1: Chroma signal terminal of S
VIDEO OUT jack (75
Ω
terminated)
CH2: Y signal terminal of S VIDEO
OUT jack (75
Ω
terminated)
Measuring Instrument Oscilloscope
Adjustment Page C
Adjustment Address 28
Specified Value A = 100mVp-p or less
B = 200mVp-p or more
Adjusting method:
Order Page Address Data Procedure
1 0 01 01 Set the data.
2 D 11 10 Set the data, and press PAUSE
button.
3 Check that the burst signal (B) is
output to the chroma signal
terminal of S VIDEO OUT jack.
4 3 0C 04 Set the data, and press PAUSE
button.
5 C 28 Change the data for minimum
amplitude of the burst signal
level (A).
(The data should be “00” to “07”.)
6 C 28 Press PAUSE button.
7 3 0C 00 Set the data, and press PAUSE
button.
8 Check that the burst signal level
(B) satisfies the specified value.
9 D 11 00 Set the data, and press PAUSE
button.
10 0 01 00 Set the data.
When the data of page: 3, address: 0C, is 04:
When the data of page: 3, address: 0C, is 00:
Fig. 5-3-9.
Fig. 5-3-8.
CH1
CH2
A
H
CH1
H
B
VC-254 board
IC1502
1
13 24
48 37
12
36
25