•
•
VI.
MECHANISM
ADJUSTMENT
ADJUSTMENT SCREW
FLYWHEEL
t
CAPSTAN
Fig. 5
Flywheel Loose Adjustment
1. FLYWHEEL LOOSE PLAY
ADJUSTMENT (Refer to Fig. 5)
Adjust by turning flywheel loose play adjustment
screw to obtain a 0.1 to 0.2 mm
of
loose play when
the flywheel
is
moved
as
indicated
by
the arrow
mark. Paint lock the adjustment screw after adjust-
ment.
2. WINDING TORQUE MEASUREMENT
IN EACH MODE
Insert cassette torque meter and measure in each
mode.
For fast forward and rewind measure at the end
of
the tape when the tape has stopped running. The
specified torque is:
Playback : 35 to 70
g-cm
Fast Forward, Rewind : 70 to 150
g-cm
3.
PINCH ROLLER PRESSURE
MEASUREMENT (Refer to Fig. 6)
At Playback mode, push the pinch roller with a
spring gauge until the pinch roller separates from the
capstan by about 1 mm to 2 mm and then gently
return. Take a reading
of
the spring gauge indication
at the moment the pinch roller touches the capstan
and begins to rotate.
Specified Pinch Roller Pressure : 300 to 400 grams
In
case specified pressure cannot be attained, replace
the pinch roller spring.
PINCH
ROLLER
Pl
NCH
ROLLER SPRING
Fig. 6 Pinch Roller Pressure Measurement
MOTOR
Fig. 7 Tape Speed Adjustment
4. TAPE SPEED ADJUSTMENT
(Refer
to
Fig. 7)
Connect the frequency counter
to
the line
output
terminals. Playback a 1,000
Hz
pre-recorded test
tape and adjust tape speed adjustment volume to
obtain a tape speed
of
1,000
Hz
± 1
%.
35
To Next Page
Loading...
