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4-3-5.CHECKING AFTER ADJUSTMENT
1) Play the alignment tape (NTSC: VHJ-0006, PAL: VHJ-
0009) and check that the envelope waveform is acti-
vated immediately and that there are no fluctuations
in the envelope waveform or the audio output wave-
form.
2) Load a cassette tape (NTSC: T-120, PAL: E-180) and
use it to record and replay. Check that the envelope
waveform is activated immediately and that there are
no fluctuations in the envelope waveform or the
audio output waveform. (When recording on the
tape, input 1kHz to the audio input terminal. Use a
scratch-free cassette tape (NTSC: T-120, PAL: E-180).)
Check that at the tracking centre, the front half down
and back half down are not more than 20% of the
value at the point where the envelope waveform
amplitude is at its maximum.
3) Check that the envelope waveform is activated
immediately when you switch from PLAY to REV or
from REV to PLAY. Check that there is no slack in the
tape next to the pinch roller.
4) Check that the envelope waveform is activated
immediately when you switch to PLAY from FF, REW,
CUE, REV or STOP mode. Check that there is no slack
in the tape next to the pinch roller.
5) Check that the tape is not curling or riding up on the
upper or lower flanges of the tape guides in PLAY, FF,
REW, CUE or REV modes.
6) Check that in PLAY mode, the tape runs as shown in
Fig.4-3-7.
7) Load a tape (NTSC: T-160, PAL: E-240) and play it
back. carry out the checks described in steps 3) to 5)
above.
S tape guide
No.0 tape
guide
Full erase
BT post
head
Cylinder
S guide
(drum)
roller
Audio R/P head assembly
(ACE head)
T guide roller
Pinch roller
–31–
Loading guide
T tape guide
post
Capstan shaft
Fig.4-3-7
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