Sony DVCAM DSR-25, Service Manual

Page: 154 / 238

5-29
DSR-25
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-6) runs in the PLAY mode.
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-6) 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 fluc-
tuation of waveform amplitude.
• If not flat
If the waveform at the entrance is bad, rotate TG3. If the wave-
form at the exit is bad, rotate TG6 to flatten the waveform.
RV1
RV3
RV2
RV4
TG3
(adjustment of entrance) TG6
(adjustment of exit)
C
C
0.65 A A
A : 100 %
C
C
A C
8
1
Tracking waveform check -1
Tracking waveform check -2
The waveform should not change sharply.
A
Emin
(Emin - Emax) 30% or ( A)
10
3
Emax
A : 100%
[Waveform in CUE or REV mode]
[Waveform in FWD mode]
Emin: Minimum value
Emax: Maximum value
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.
Exit side Entrance side
Normal waveform