Sony GV-A500E, Руководство по обслуживанию

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5-26
3. NTSC LP mode Switching Position Adjustment
(VC-197 board)
If deviated in this case causes switching noise or jitter on the LP
mode played back screen.
Mode Playback
Signal Alignment tape:
For tracking adjustment (WR5-1NP)
Measurement Point CH1: Pin
3
of CN207 (RF SWP)
CH2: Pin
6
of CN207 (PB RF)
Measuring Instrument Oscilloscope
Adjustment Page F
Adjustment Address 38, 39
Specified Value t1 = 0 ± 10
µ
sec
Adjusting method:
1)
Set page: 0, address: 01, data: 01.
2) Set page: F, address: 29, data: 40 and press the PAUSE button
of the adjusting remote commander.
3) Change the data of page: F, address: 39 and minimize “t1”,
and press the PAUSE button of the adjusting remote
commander. (Coarse adjustment)
4) Change the data of page: F, address: 38, and adjust so that the
switching position (t1) becomes the specified value. (Fine
adjustment)
5) Press the PAUSE button of the adjusting remote commander.
6) Set page: F, address: 29, data: 00 and press the PAUSE button
of the adjusting remote commander.
7) Set page: 0, address: 01, data: 00.
Fig. 5-3-8.
CH1
CH2
Enlargement
t1=0
±
10
µ
sec
CH1
CH2
3-4. VIDEO SYSTEM ADJUSTMENTS
Video system adjustments must be performed in the following order.
[Adjusting Order]
1. 28 MHz origin oscillation adjustment
2. Filter f0 adjustment
3. Y OUT level adjustment
4. C OUT level adjustment
5. RP filter f0 adjustment
6. AFC f0 adjustment
7. NTSC Hi8 REC Y current adjustment
8. PAL Hi8 REC Y current adjustment
9. NTSC Hi8 REC C current adjustment
10. PAL Hi8 REC C current adjustment
11. REC C current adjustment
1. 28 MHz Origin Oscillation Adjustment (VC-197 board)
Set the frequency of the clock for synchronization.
If deviated, the synchronization will be disrupted and the color will
become inconsistent.
Note 1 : If the x2 frequency is displayed, insert a 1 k
Ω
resistor
between the measuring point and probe.
Note 2 :
NTSC model : GV-A500
PAL model : GV-A500E
Mode VTR stop
Subject Arbitrary
Measurement Point Pin
6
of IC206
Measuring Instrument Frequency counter
Adjustment Page F
Adjustment Address 3B
Specified Value f = 14318181 ± 71 Hz (NTSC)
f = 14187500 ± 70 Hz (PAL)
Adjusting method:
1)
Set page: 0, address: 01, data: 01.
2) Set page: 3, address: 01, data: 41 and press the PAUSE button
of the adjusting remote commander.
3) Change the data of page: F, address: 3B, and set the oscillation
frequency (f) to the specified value.
4) Press the PAUSE button of the adjusting remote commander.
5) Set page: 3, address: 01, data: 00 and press the PAUSE button
of the adjusting remote commander.
6) Set page: 0, address: 01, data: 00.