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CcxX-631
3.2 CHECK POINTS OF CASSETTE MECHANISM
Confirm the following items when
replacing parts of the cassette mecha-
nism.
,
@ Fast forward and rewinding time:
100-120 seconds
Using a C-60, set to fast forward and
rewind, and measure the time with a
stop watch.
Mi REW torque:
More than 50 g-cm
Using a cassette type torque meter
(130 g-cm), measure the value when
the tape stops in the REW mode.
IB Tape speed deviation:
3,000Hz +90Hz, -30Hz
(4.76cm/s +3%, -1%)
Using an NCT-111, measure the speed
at the start and end of winding and
take the maximum
values.lf values
indicated by the pointer vary consider-
ably, adjust to 70% of the minimum
and maximum values. Measuring time
shall be 5-6 seconds.
§ Winding torque:
45-70 g-cm
Using a cassette type torque meter
(100 g-cm), measure the minimum
value
while
in
the
play
mode.
Measuring time shall be 2.5-6 sec-
onds.
W@ Back tension torque:
1.5-5.5 g-cm
After setting the REW mode without
loading a cassette tape for 5 minutes,
measure the back tension torque in
the play mode, using a cassette type
torque meter.
Wow
and flutter:
Less than 0.15%(WRMS)
Using the NCT-111, measure the wow
and flutter at the start and end of
winding
and take the
maximum
value. If values indicated by the point-
er very considerably, adjust to 70 % of
the minimum
and maximum
values.
Measuring time shall be 5-6 seconds.
FF torque:
More than 50 g:cm
Using a cassette type torque meter
(130 g-cm), measure the value when
the tape stops in the F.F. mode.
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