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L-PDl U
7. MECHANICAL
ADJUSTMENTS
AND CHECKS
.
The items discussed
here relate to general on-site servicing (field servicing). Adjustments
and replacements
that require
sophisticated
facilities,
jigs and technology
are omitted.
In addition, in order to maintain the characteristics
that the unit has when it is new, not only are inspection and maintenance
necessary, but it is absolutely
necessary that, for example, the tape not be damaged, and always use jigs for adjustments
that require them.
<Precautions>
(1) Always set the power supply and state of the unit as follows for mechanism
adjustments
and checks.
AC adapter used, with cassette controller
assembly
1
07-l Checking the playback (recording)
winding torque
07-4 Back tension torque check and adjustment
in record (playback)
mode
1 AC adapter used, without cassette controller
assembly
(independent
Mechanism)
1
07-2 Checking the rewinding
playback
(VS-REW) winding torque
DC3V, without cassette controller
assembly
(Independent
Mechanism)
07-3 Checking of reel base height
07-5 Checking and adjustment
of tension roller position in record (playback)
mode
07-6 Checking of supply S reel base no-load torque
07-7 Checking
of loading back tension
07-8 Checking of winding Tu reel base ratchet torque
07-9 Checking of rewinding
playback (VS-REW)
back tension
l 7-10 Checking of pinch pressing force
(2) When performing
checks with a DC3V power supply and independent
mechanism,
disconnect
the loading motor
FPC from the connector.
(3) Always run the tape with the cassette controller
assembly
attached.
7-1. Checking the ptayback (recording)
winding torque
(l)Set
the torque cassette
with the cassette
controller
assembly attached, then, in SP recording mode (playback mode
if a signal has already been recorded in SP mode on the tape), confirm that the torque on the winding side is within the
standard.
Winding torque standard-in
record (playback)
mode
0.70 * 0.35mNm
(7.0 + 3.5gfcm),
ripple 0'.2mN*m (2gfcm)
or less
(If there is torque ripple, read the center value.)
7-2. Checking. the rewinding playback (VS-REW) winding torque
(1) Remove
the cassette
controller
assembly,
press the
DOWN switch., using the adhesive tape and referring to 9-
3, operate in the TEST mode (TOl) to rewind, and set the
rewinding
playback (VS-REW)
mode.
(2) Set the torque gauge on the S reel base, press the front
end of tension post with your finger in the arrow A direction
so as to ascertain that the winding torque is as specified.
(Check without rotating the torque gauge.)
Fig. 1. Removal of tension band when measur-
ing the rewinding
playback
(VS-REW)
winding torque
7-l
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