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3 . T A P E S P E E D A D J U S T M E N T
Information
The cassette tape speed is usually said to be 4.8
cm/sec. However, the precise speed is 4.76 cm/sec.
Correct tape speed is a must for compatibility.
Tape speed is determined mainly by the capstan,
and the speed varies with the pinch roller pressure,
the tension or the line voltage variations. It is
inevitable that the take-up speed slows as the
diameter of the wound-up tape increases. The
speed difference between start and finish shall be
within !2-
37o with decks of ordinary grade and
within !0.2- 77o for those of high grade.
Tape speed deviation (7o) =
ftt
fo
x 100
r o
fo = Recorded signal frequency (Hz)
fr = Reproduced signal frequency (Hz\
Adj ustment
a.
Connect a frequency counter to the output of
the subject deck.
b.
Playback the center portion of the tape (3kHz)
on the subject deck.
c.
Adjust
the speed by turning
the semi-fixed
resistor provided for tape speed adjustment so
that
the
frequency
counter
shows a value
closest to 3kHz.
Photo 5
3 0
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