Read Sony GV-D200 Service Manual online
5-25
3-5.
VIDEO SYSTEM ADJUSTMENTS
Switch setting:
DEMO MODE (Menu setting) ........................................ OFF
1. 27MHz Origin Oscillation Adjustment
(VC-250 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
VTR stop
Signal
Not required
Measurement Point
Pin 5 of IC1505
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.
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-250 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
VIDEO OUT jack (75
Ω
terminated)
CH2: Y signal terminal of S VIDEO
OUT jack (75
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
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.
button.
3
Check that the burst signal (B) is
output to the chroma signal
terminal of S VIDEO OUT jack.
output to the chroma signal
terminal of S VIDEO OUT jack.
4
3
0C
04
Set the data, and press PAUSE
button.
button.
5
C
28
Change the data for minimum
amplitude of the burst signal
level (A).
(The data should be “00” to
“07”.)
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.
button.
8
Check that the burst signal level
(B) satisfies the specified value.
(B) satisfies the specified value.
9
D
11
00
Set the data, and press PAUSE
button.
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. 5-3-10.
CH1
CH2
A
H
CH1
H
B
Fig. 5-3-9.
VC-250 board
IC1505
8
5
1
4
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