Akai GX-F25

Fig. 7 AKAI Head Projection Gauge
PINCH ROLLER SPRING
HZ
SNE
CY
im
1. FLYWHEEL LOOSE PLAY ADJUSTMENT
(Refer to Fig. 5)
Adjust the screw (a) so that the flywheel moves 0.1 —
0.2 mm in the direction indicated by the arrow.
. PLUNGER POSITIONING
(Refer to Figs. 6, 7)
1) Play Plunger Adjustment
Set the Akai Head Projection Gauge. Adjust the
screws (a) and (b) so that when PAUSE mode is
engaged, the Head Projection Gauge indicates to
2.5 mm + 0.05 mm.
2) Brake Plunger Adjustment
Set the Akai Head Projection Gauge. Adjust the
screws (c) and (d) so that when play mode is en-
gaged, the Head Projection Gauge indicates to
3.5 mm + 0.15 mm.
. PINCH ROLLER PRESSURE
MEASUREMENT (Refer to Fig. 8)
At playback mode, push the pinch roller with a
ty to 4209
Fig. 8
spring gauge until the pinch roller separates from
the capstan by about 1 mm to 2 mm and then gen-
tly return. Take a reading of the spring gauge in-
dication at the moment the pinch roller touches
the capstan and begins to rotate
Specified Pinch Roller Pressure: 320 — 420 g
In case specified pressure cannot be attained, re-
place the pinch roller spring.
. VARIOUS TORQUE MEASUREMENT
Use the Cassette Torque Meter to confirm that the
value of each mode is as follows:
Take-up Torque 35 ~50¢-cm
Back Tension 2~4¢-cm
FF/RWD Torque 85 ~ 130 g-cm
. TAPE SPEED ADJUSTMENT
(Refer to Fig. 6)
Playback a 1,000 Hz pre-recorded test tape and adjust
the tape speed adjustment volume to obtain a tape
speed of 1,000 Hz + 5 Hz.