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10. ADJUSTMENTS
10.1
MECHANICAL
ADJUSTMENTS
Prior to Adjustment
Clean the both
reel base, the capstan and the
pinch roller with an alcohol moistened swab.
Pinch Roller Pressure Adjustment
1. Put the tape deck into the playback mode.
2. Gently push against the pinch roller arm with
the tension gauge and separate the pinch roller
slightly from the capstan.
3. Then
the pinch roller back onto the capstan,
and read the value when the pinch roller starts
to rotate.
If the
reading
faiis to lie within
300 ~ 500g, replace the pinch pressure spring.
Tension gauge
Pinch roller
Fig. 10-1
Pinch roller pressure adjustment
Reel Base Torque Adjustment
Measure
the
torque
with
the
torque
meter
during
playback,
fast forward
(FF) and rewind
(REW) modes. The measured values should normal-
ly lie within
the
allowably
ranges
listed in the
table 1.
If the measured values lie outside the relevant
ranges, replace the TU (take-up) reel base assembly
and/or
supply
reel
base
assembly,
TU
idler, or
drive arm full assembly.
Table 1
TU reel base
Playback mode
" — 57g.cm
Supply reel base
FF mode
75 — 135g.cm
*
1.5 — 5g.cm
* 1.5 — 5g.cm
75 — 135g.cm
*Denotes back tension torque.
CT-660,CT-S!!1
Tape Speed Adjustment
1. Connect
the frequency
counter to the DOL.L
terminal on the deck assembly.
2. Playback
the
38kHz
portion
of the
STD-301
test
tape.
At
the
beginning,
the
frequency
should
be
lie
within
the
3000Hz~3010Hz
range,
and
may
be
adjusted
by turning
the
semi-fixed resistor located in the capstan motor
adjustment hole as shown in Fig. 10-2.
Decrease
oN
Increase
Fig. 10-2
Tape speed adjustment
REC Joint Check and Adjustment
Move
the REC joint mechanism
catching posi-
tion if the slide switch is not fully switched when
the tape transport unit is in recording mode.
Fig. 10-3
REC joint check and adjustment
25
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