Check Switch Over From Rps To Playback Mode; Envelope Check; Tape Wrinkle Check - Samsung CXJ1331/TUCX Service Manual

Alignments and Adjustments (VCR)
3-2-4 Check Switch over from RPS to
Playback Mode
1. Check the transition from RPS to playback
mode using a pre-recorded SP tape.
Make sure that the leading edge of envelope
comes to an appropriate steady state within 3
seconds as shown in Fig. 3-15.
2. If the leading edge of envelope waveform
does not meet the specification within 3
seconds, make sure that there is no gap
between the S-roller lower flange and the
tape. If there is a gap, readjust the S-guide
roller.
3 Change operation from RPS to Play back
Mode, and make sure that the leading edge
ENTRANCE SIDE ENVELOPE
Fig. 3-15 Video envelope rise (when transiting from RPS to
Playback mode)
3-6

3-2-5 Envelope Check

1. Make recordings on T-120 and T-160 tapes,
and make sure that the playback output
envelope meets the specification show in Fig.
3-16.
2. Play back a self recorded tape (use a T-120).
The video envelope should meet the
specification shown in Fig. 3-16.
In SLP Mode, (A) should be the same as (B). If
the head gap is wide, check the cylinder
A
Fig. 3-16 Envelope Output and Output Level Difference
Playback mode)

3-2-6 Tape Wrinkle Check

1. Run the T-180 tape in playback, FPS, RPS and
the Pause Modes, and observe the tape
wrinkle at each guide.
2. If excessive tape wrinkle is observed during
the above modes, do the following
adjustments :
If tape wrinkle occurs at S, T-guide rollers, do
a linearity adjustment. If tape wrinkle exists
at the tape guide flange, do an A/C head
assembly adjustment.
B
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