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5-4. CAPSTAN ASSEMBLY THRUST
1) Turn the thrust adjusting screw so that thrust
of the capstan shaft is within 0.05 mm
to
0.15 mm.
Theust
play
0.05 mm
to 0.15 mm
-_
Theust
adjusting
screw
5-5. TAKEUP TORQUE
Takeup torque.adjustment is. critical. to.stabilize
tape travel and reduce variations in tape speed.
1) Load a cassette torque meter (0 to 100 g-cm,
1.4 0z-inch) in the cassette holder.
2) Measure the toraue by running the tape of the
meter in the reproduce mode. The meter read-
ing should be 45 —65 g-cm (0.6—0.9 oz-inch).
3) If the reading is-outside this range, clean the
surface of the idler pulley in the reef table as-
sembly which comes
into contact with the
tape using cleaning
liquid.
Also check the
operation of the moving parts of the ree! table
assembly.
4) \f the reading is still unsatisfactory, replace
the ree! table.ass'y.
5-6. FAST FORWARD AND REWIND
TQRQUE
1) Load a cassette torque meter (0 to 160 g-cm,
22 02-inch).
2) With the deck in the fast. forward and rewind
'modes, read the meter. If the meter is provid-
ed with tape, note the readings with the tape
fully wound on the reel taking up the tape in
each mode
so that the measurement is not
influenced by the tape's inertia. The fast for-
ward torque must be in the range 90 — 160
g-cm (1.3 — 2.2 oz-inch) and the rewind tor-
que must be in the range 90 — 160 g-cm (1.3
— 2.2 02-inch).
3) lf the readings are outside these ranges, clean
the surface of the idler pulley with cleaning
liquid and check the operation of the moving
parts of the ree! table ass'y.
5-7. PINCH ROLLER PRESSURE
Pinch roller pressure must also be adjusted to
the correct value to stabilize tape travel and re-
duce variation in tape speed.
1) Remove the cessette door cover te install the
spring scale.
2) With the deck in the reproduce mode, attach
the scale near the shaft of the pinch roller,
being careful not to touch the pigeh roller.
See Fig. 6-6.
3) Move the scale gradually in the direction of
the arrow until the capstan shaft and pinch
roller are completely separated.
;
4) Gradually return the pinch roller and note the
reading on the scale when..the .pinch _roller
touches the capstan and starts rotating. The
reading should
be between
390 and 490g
(13.8 and 17.3 oz).
5) 1f the reading is outside this range, rep'
+
the pinch roller pressure spring or adjust wie
pressure by bending the spring as shown in
Fig. 5-6.
Bend here
to achust
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