Sony GV-D1000E - Digital Video Cassette Recorder, Руководство по обслуживанию

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5-21
GV-D1000/D1000E
3-5. VIDEO SYSTEM ADJUSTMENTS
1. 40.5MHz/54MHz Origin Oscillation Adjustment
(MS-95 board)
Set the frequency of the clock for synchronization.
If deviated, the synchronization will be disrupted and the color will
become inconsistent.
Mode VTR stop
Signal Not required
Measurement Point Pin
8
of IC3302 on VC-275 board
Measuring Instrument Frequency counter
Adjustment Page F
Adjustment Address 12
Specified Value f=13500000
±
68Hz
Adjusting method:
Order Page Address Data Procedure
1 0 01 01 Set the data.
2 F 12 Change the data and set the
frequency (f) to the specified
value.
3 F 12 Set the data, and press PAUSE
button.
4 0 01 00 Set the data.
2. Chroma BPF fo Adjustment (VC-275 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 Check that the burst signal (B) is
output to the chroma signal
terminal of S VIDEO OUT jack.
3 3 0C 04 Set the data, and press PAUSE
button.
4 C 28 Change the data for minimum
amplitude of the burst signal
level (A).
(The data should be “00” to
“0F”.)
5 C 28 Press PAUSE button.
6 3 0C 00 Set the data, and press PAUSE
button.
7 Check that the burst signal level
(B) satisfies the specified value.
8 0 01 00 Set the data.
Fig. 5-3-7.
CH1
CH2
A
H
CH1
H
B
When the data of page: 3, address: 0C, is 04:
When the data of page: 3, address: 0C, is 00:
Fig. 5-3-6.
1
20
10
11
IC3302
VC-275 board