<REW back tension standard>
(If the tension fluctuates, read its center value.)
15 + i: mN (1.5 + i$gf )
7-8. Checking of winding Tu reel base ratchet torque
(1
(2
DC3V, without cassette controller assembly (Independent
Mechanism)
)
Remove the cassette controller assembly, then apply DC3V to the
loading
motor
and put the system
into standby mode.
(refer to 9-1)
Move the swing arm toward the
S reel base side.
Be careful not to prevent damage to the gears and other
parts all this while.
(Fig. 8)
Set
a back tension measurement reel hub on the Tu reel base.
1
1
(4) Using a dial tension gauge, pull the string in
the A direction,
then
confirm that
the tension is within the standard.
<Winding Tu reel base ratchet torque standard >
(If
the
tension fluctuates, read its center value.)
90mN or less
(9gf or less
)
7-9. Checking of rewinding playback (VS-REW) back
tension
DC3V, without cassette controller assembly (Independent
Mechanism)
(1) Remove the cassette controller assembly, then apply DC3V to the loading
motor and put the system into rewinding playback (VS-REW)
mode.
(refer to
9-l)
(2) Move the swing arm toward the S reel base side.
Be careful not to prevent damage to the gears and other parts all this while.
(3) Set a torque gauge on the Tu reel base.
(4)Turning the torque gauge to counterclockwise (1 turn for 3 seconds), then
confarm that the torque is within the standard.
<Rewinding playback (VS-REW) back tension standard value>
(If the tension fluctuates, read its center value.)
0.70 + 0.35mN=m (7.0 + 3.5gfcm)
7-1O:Checking of pinch pressing force
1 DC3V, without cassette controller assembly (Independent Mechanism)
(l)Set the pinch roller pressing force measuring thread on the pinch lever
(position A
,
Fig. 9).
(2) Set the mechanism to the playback mode, press the pinch roller against the
capstan axis.
(3) Fit the tension gauge to the pinch roller pressing force measuring thread, pull
in the arrow B direction shown in Fig. 11 to separate a little the pinch roller from
the capstan axis.
(4) Gradually return the pinch roller, and when the pinch roller contacts parallel
the capstan axis, read the value (see Fig. 10) to make sure that the value
conforms to the standard shown below.
<Standard>
1.8 + 0.3N (180 + 30gf)
<Caution>
After making this measurement, quickly release the system from playback
mode and remove the pinch roller from the capstan shaft. (If the pinch roller
is left fitted onto the capstan shaft for a long time, the pinch roller will be
deformed.)
Q
A-
Fig. 9
Fig. 10
NG
Fig. 7. Loading back tension measurement
method
Mcve the swing arm
toward the S reel base
side.
Fig. 8. Winding Tu reel base ratchet torque
measurement method
Fig. 11
7-3
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