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VL-RDl U
8-4. Running rough adjustment
(Since this adjustment is performed without cassette controller, put a proper weight so that the cassette does not rise ,
and make an adjustment.)
Adjustment item
I
Method and description
Su, Tu guide roller height adjustment
Turn to 180"
L-5
T roller
Fig. 1.
Check of V/SR envelope wave form
(l)Loosen
the guide roller lock screw, then tighten loosely so that
the roller turns easily.
(2)Replay an alignment tape, and adjust the Su, Tu guide roller so
that the envelope sides of entrance and exit are flat.
(3)Perform a l/4 shift, then, as in the above case, adjust until the
envelope becomes flat.
*
If running is difficult for the entrance changed, turn the T roller to
180". (refer to Fig. 1)
Entrance side
Exit side
Normal
I
I
(l)Confirm
that the envelope waveform peaks in V/SR mode are
uniform.
(2)If they are not uniform, fine-adjust the guide roller and the Tu
guide.
'
A
I
B
'
Adjust so that A % B.
Check of tape wrinkles
(l)Make
sure that the S guide flange tape is free from creases
in the PB mode and V/SR mode.
Qlf crease is found, make an adjustment in the range of +180°.
QAfter
adjustment apply Screw Lock.
(2)Check that the tape is not distorted between the Tu guide and
pinch in the PB mode and the V/SR mode.
Qlf crease is found, make an adjustment in the range of f180".
QAfter
adjustment apply Screw Lock.
Deformation
T roller
Pinch
Check the rising time of the envelope wave
form
(1)Check the rising time of the envelope when switching from V/
SR mode to PB mode. (Within 5 set)
(2)Check the rising time of the envelope when switching from
STOP mode to PB mode. (Within 5 set)
8-3
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