Track Adjustment And Check; (Checking The Rf Waveform); Track Check - Sony DSR-250 Service Manual

2-4-8.

TRACK ADJUSTMENT AND CHECK

(Checking the RF Waveform)

• Checking the RF waveform
Check that the RF waveforms at both the entrance and exit are flat
while the tracking tape (J-17) runs in the PLAY mode.
TG3
(adjustment of entrance)
RV3
RV1
RV4
RV2
2-4-9.

TRACK CHECK

• Check
The difference between the maximum value and minimum value of
the waveform amplitude during playback of the tracking tape (J-
17) in the FWD mode should be 30% or less of the waveform
amplitude during the CUE (or REV) mode (which is taken as 100%
as shown). At the same time, there must not exist too much
fluctuation of waveform amplitude.
Tracking waveform check -1
Tracking waveform check -2
C
C
The waveform should not change sharply.
TG6
(adjustment of exit)
0.65 A A
A : 100 %
C
A
1
C
C A
8
• If not flat
If the waveform at the entrance is bad, rotate TG3. If the waveform
at the exit is bad, rotate TG6 to flatten the waveform.
Normal waveform
Entrance side
[Waveform in CUE or REV mode]
[Waveform in FWD mode]
Emin: Minimum value
Emax: Maximum value
5-57
Exit side
If the waveform at
the entrance is bad,
rotate TG3 to adjust
the waveform.
If the waveform at
the exit is bad,
rotate TG6 to adjust
the waveform.
A : 100 %
Emin Emax
3
(Emin - Emax) 30% or ( A)
10