Mechanism Adjustment; Flywheel Loose Play Adjustment; Winding Torque Measurement In Each Mode; Pinch Roller Pressure Measurement - Akai UC-K2 Service Manual

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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 %.
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