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4-3-3.GUIDE ROLLER HEIGHT ADJUSTMENT
(See Figs.4-3-3 and 4-3-4)
1) Playback the Alignment Tape (NTSC: VHJ-0006, PAL:
VHJ-0009) and check that the envelope waveform is
at its maximum at the tracking centre. Then, after
loosening the S guide roller and the T guide roller by
rotating them counterclockwise, tighten them in turn
until the envelope waveform becomes flat. If the
envelope waveform is not at its maximum at the
tracking centre, refer to section 4-3-4 and carry out a
rough adjustment of the horizontal position of the
audio R/P head (ACE head) before adjusting the guide
rollers.
2) Adjust the S guide roller.
Playback the alignment tape (NTSC: VHJ-0006,
PAL: VHJ-0009). Press the tracking (–) button, and
check whether, when the envelope waveform has
reached 50% of its maximum, the front half of the
envelope waveform is flat. If not, fine-tune the S
guide roller as follows.
a. If the front half of the envelope waveform is as
shown in Fig.4-3-4 (a), this means that you have
pressed the S guide roller too far. Therefore, loosen
it slightly, and when it is in the state shown in Fig.4-
3-4 (b), tighten it again, stopping when the enve-
lope waveform is flat.
b. If the front half of the envelope waveform is as
shown in Fig.4-3-4 (b), this means you have not
pressed the S guide roller far enough. Therefore,
tighten it slightly, stopping when the envelope
waveform becomes flat.
c. If the front half of the envelope waveform is as
shown in Fig.4-3-4 (c), it may happen that when
you tighten the S guide roller, the wrapper wave-
form does not disappear, but sinks into the flat
part, as shown in Fig.4-3-4 (d). If this happens, the
status shown in Fig.4-3-4 (c) is normal, so loosen
the S guide roller, then tighten it again until the
envelope waveform is as shown in Fig.4-3-4 (c).
Check that at the tracking centre, the output of the
front half of the envelope waveform is not less than
80% of the maximum.
Rotate the S guide roller 20˚ counterclockwise.
3) Adjust the T guide roller.
Playback the alignment tape (NTSC: VHJ-0006,
PAL: VHJ-0009). Press the tracking (–) button and
check whether, when the envelope waveform is
50% of maximum, the back half of the envelope
waveform is flat. If not, loosen the T guide roller
slightly, then tighten it gradually until the back half
of the envelope waveform becomes flat.
Check that the output for the back half of the
envelope waveform is at its maximum at the
tracking centre.
4) Check that the envelope waveform does not fluctuate
when you switch from CUE to PLAY or from REV to
PLAY. If the front half of the envelope waveform does
fluctuate, tighten the S guide roller 1˚ to 20˚. If the
back half of the envelope waveform does fluctuate,
repeat steps 3) and 4).
If the envelope waveform
is at maximum at the
tracking centre, adjust to
flat.
(a) S guide roller
pressed too far
(c) Normal status for
wrapper waveform
–29–
In normal status, the waveform
will be flat even when the en-
velope waveform is reduced to
50%.
100%
(b) S guide roller not
pressed far enough
50%
(d) S guide roller
pressed too far
50%
Fig.4-3-3
50%
50%
50%
Fig.4-3-4
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