Pinch Roller Pressure Measurement; Winding Torque Measurement In Each Mode; Tape Speed Adjustment - Akai AC-M2 Service Manual

V. MECHANICAL ADJUSTMENT
5-1. PINCH ROLLER PRESSURE MEASUREMENT (Refer to Fig. 5-1)
PINCH ROLLER
Put in PLAY mode, push pinch roller arm down with
the spring gauge, push the pinch roller 1~2 mm from
the capstan and release slowly. Read the spring gauge
at the moment the pinch roller touches the capstan
5-2. WINDING TORQUE MEASUREMENT
IN EACH MODE (Refer to Fig. 5-2)
CASSETTE TORQUE METER
Fig.5-2 Cassette Torque Meter
Insert cassette torque meter (AJ-751179) and mea-
sure in each mode.
For fast forward and rewind measure at the end of
the tape has stopped running.
Forward play: 35 to 70 g-cm
Fast Forward, Rewind: 70 to 160 g-cm
SPRING GAUGE
} 300 to 500gtm
[4
TS PINCH ROLLER
SPRING
Fig. 5-1
and begins to rotate.
Specified, contact pressure measurement of 300 to
500 grm. If there is no measurement obtained,
replace the pinch roller spring.
5-3. TAPE SPEED ADJUSTMENT
(Refer to Fig. 5-3)
TAPE SPEED ADJUSTMENT VOLUME.
Fig. 5-3.
Connect a frequency counter to line output terminal.
Playback a 1,000 Hz pre-recorded test tape (AT-
750774) or a 3150Hz, Pre-recorded test tape
(AT-751263), and adjust the tape speed adjustment
volume to obtain a tape speed of 1000 + 1.0%, or
3150 + 1.0%.
SERVICE MANUAL AC-M2