Pioneer KEX-900 Service Manual page 33

3.3 CHECK POINTS OF CASSETTE MECHANISM
Confirm the following items when re-
placing parts of the cassette mecha-
nism.
@ Fast forward and rewinding time:
95 ~ 115 seconds
Using a C-60, set to fast forward and re-
wind, and measure the time with a stop
watch.
@ REW torque:
67 ©\ 130g°cm
= =
pon
Using a cassette type torque meter (120
g'cm),
measure
the value when
the
tape stops in the REW mode.
@ Tape speed deviation:
3,000 * 8 Hz
(4.76 cm/s 73%)
Using an STD-301, measure the speed
at the start and end of winding and see
that a deviation remains within the limits
each time. If values indicated by the
pointer vary considerably, adjust to
70% of the minimum and maximum
values. Measuring time shall be 5~6
seconds.
B Winding torque:
37 \ 63gecm
Using a cassette type torque meter (100
g:cm), measure the minimum value
while in the play mode. Measuring time
shall be 5 ~ 6 seconds.
M™@ Back tension torque:
1.8% 4,2g +cm
After setting in 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 an STD-301, measure the wow
and flutter at the start and end of wind-
ing and take the maximum value. If
values indicated by the pointer vary
considerably, adjust to 70% of the mini-
mum and maximum values. Measuring
time shall be 5 ~ 6 seconds.
@ F.F. torque:
67 ~\ 130g-cm
Using a cassette type torque meter (120
g'cm), measure the value when the
tape stops in the F.F. mode.
@ Cassette loading force:
450 ~ 550g
Push the center of the cassette and
measure the force with a tension meter
(1 kg).
q
;
:
3
;
;
j :