(Vc-235 Board); Hi8/Standard 8 Mm Switching Position Adjustment (Vc-235 Board); Cap Fg Duty Adjustment (Vc-235 Board) - Sony DCR-TRV120 Service Manual

7. Hi8/standard 8 mm Switching Position Adjustment

(VC-235 board)

If deviated in this case causes switching noise or jitter on the Hi8/
standard 8 mm mode played back screen.
Mode Playback
Signal Hi8/standard 8 mm alignment tape:
For tracking adjustment
(WR5-1NP(NTSC))
(WR5-1CP(PAL))
Measurement Point CH1: Pin 8 of CN1108
(VC RF SWP)
CH2: Pin 5 of CN1108 (PB RF)
Measuring Instrument Oscilloscope
Adjustment Page F
Adjustment Address 62, 63
Specified Value t1=0 ± 10 µsec
Adjusting Method:
1) Select page: 0, address: 01, and set data: 01.
2) Select page: F, address: 22, set data: C0, and press the PAUSE
button of the adjustment remote commander.
3) Select page: 2, address: 2E, and set data: 02.
4) Set to the playback mode.
5) Select page: F, address: 62, change the data and minimize "t1",
and then press the PAUSE button. (Coarse adjustment)
6) Select page: F, address: 63, change the data and adjust so that
the switching position (t1) becomes the specified value. (Fine
adjustment)
7) Press the PAUSE button.
8) Select page: F, address: 22, set data: 80, and press the PAUSE
button.
9) Select page: 2, address: 2E, and set data: 00.
10) Select page: 0, address: 01, and set data: 00.
CH1
CH2
Enlargement
CH1
CH2
Fig. 5-3-7
t1=0 ± 10 µsec
5-46

8. CAP FG Duty Adjustment (VC-235 board)

Improve the capstan servo characteristic. If it is not correct. jitters
will increase.
Mode Playback
Signal Hi8/standard 8 mm alignment tape:
For checking operation
(WR5-5NSP(NTSC))
(WR5-5CSP(PAL))
Measurement Point Pin qg of CN1108 (CAP FG)
Measuring Instrument Oscilloscope
Adjustment Page F
Adjustment Address 64
Specified value Duty=50 ± 1%
Adjusting method:
1) Select page: 0, address: 01, and set data: 01.
2) Select page: 2, address: 2E, and set data: 02.
3) Set to the playback mode.
4) Select page: 6, address: 01, set data: 81, and press the PAUSE
button of the adjustment remote commander. (to start up
automatic CAP FG offset adjustment.)
5) Select page: 6, address: 02, and check that the data is "01".
6) Check that Duty of CAP FG signal satisfies the specified value.
If not, select page: 6, address: 01, set data: 00, and press the
PAUSE button, and then, repeat steps 4) to 6).
7) Select page: 6, address: 01, set data: 00, and press the PAUSE
button.
8) Select page: 2, address: 2E, and set data: 00.
9) Select page: 0, address: 01, and set data: 00.
Center of movement
A
B
Fig. 5-3-8
Duty = A/B × 100 [%]