3. Check for transitional operation from
R.P.S
to
play
Check transition from
R.P.S
mode to play mode, using
a prerecorded SP tape, make sure the entrance side of
envelope comes to an appropriate steady state within 3
seconds as shown in Fig. 14.
If the envelope wavdorm does not reach
specified
peak-to-peak amplitude within 3 seconds, adjust
as follows
:
1.
Make sure there is no gap between the supply roller
lower flange and the
tape.lf
there is a gap, adjust the
supply guide roller again.
2. Change operation mode from the
R.P.S
to the play
mode again and make sure entrance side of envelope
rises within 3 seconds.
Fig. 14
Video envelope rising when operation mode
is switched from
RPS
to play mode.
4. Envelope check
1.
Make recordings on T-l 20 and T-l 60 tapes, and make
sure the playback output envelope meets the
specification as shown in Fig. 15.
2. Playback a self recorded tape (recording made on this
unit), (with a T-l
20)
the video envelope should meet the
specification as shown in Fig. 15. In SLP mode,
(A)
should be same as
(B).
If the head gap is wide,
the upper cylinder should be checked.
5 Tape wrinkle check
1. Run T-l 60 tape in playback, FPS, RPS and
the pause mode and observe tape wrinkle at each
guide.
2. If excessive tape wrinkle i‘s observed in the mode shown
below, perform the associated adjustment shown below.
a. Playback mode
-Tape wrinkle at the S,T-guide roller section
:
Linearity
adjustment.
-
Tape wrinkle at tape guide flange : A/C head assembly
coarse adjustment.
B/A2
0.55
Bl
g
150mV
Fig. 15 Envelope Output and-output Level Difference
3-7
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