Pioneer KEH-P7020R X1B/EW Service Manual page 105

CX-1011
4.2 CHECK POINTS OF CASSETTE MECHANISM
Confirm the following
items when replacing
parts of the cassette
mechanism .
- Fast forward and rewinding time:
85–105 seconds
Using a C-60, set to fast forward and
rewind, and measure the time with a
stop watch.
- REW torque:
More than 50 g cm
•
(4.9mN•m more)
Using a cassette type torque meter
(130 g cm), measure the value when
•
the tape stops in the REW mode.
- 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.If values
indicated by the pointer vary consid-
erably, adjust to 70% of the minimum
and maximum values. Measuring
time shall be 5–6 seconds.
- Winding torque:
45–70 g cm
•
(4.41–6.86mN•m)
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.
- Back tension torque:
1.5–5.5 g cm
•
(0.15–0.54mN•m)
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.
- F.F. torque:
More than 50 g cm
•
(4.9mN•m more)
Using a cassette type torque meter
(130 g cm), measure the value when
•
the tape stops in the F.F. mode.