Akai GX-F51

GX-F71
DIGITAL
VOLTMETER
DC
DISCONNECT
POTENTIOMETER
PRE- SET VOLTAGE
.---+--o+
PCB
i
OPERATE
PULLEY
REEL MOTOR
4. POTENTIOMETER PRESET VOLTAGE
ADJUSTMENT (Refer
to Fig. 4)
1) LOW VOLTAGE ADJUSTMENT
a. With power OFF, remove the connecting cord
of the cam motor and turn the operate pulley
fully with your fingers in A direction.
b. Connect the digital voltmeter as shown in
Fig. 7-1.
c. With power ON, adjust VR2 so that the voltage
reading
will be 0.78V (OC).
2) HIGH VOLTAGE ADJUSTMENT
a. With power OFF, turn the operate pulley fully
with your fingers in B direction.
b. With power ON, adjust VRI so that the voltage
reading will be 6.73V (OC).
3) Repeat Items 1) and 2).
4) a. With Power OFF, connect the connecting cord
of the motor.
b. Remove the digital voltmeter.
V
FRONT
CAPSTAN MOTOR
FLYWHEEL
OPERATE
PULLEY
Fig. 7-1
CAM MOTOR
~ ~
I
VR2
VRI
0
a
MOTOR PCB
I
\
I
\
I
I
I
I
\
WINDOW
I
\
J_ ✓,,/
I
"
I
Fig. 7-2 Position of Operate Pulley in STOP Mode
S) a. Set power to ON.
b. Adjust
VRI slightly so that a center line
between windows of the operate pulley will
face directly above during STOP Mode.
(Fig. 7-2)
c. Remove the cassette lid and set
the AUTO
SYSTEM switch
to IPLS Mode.
d. Confirm that the head and pinch roller do
not
move up and down when the FF and REW
switches are. alternately depressed.
e. Turn the reel with fingers in STOP Mode to
check that the brake works sufficiently.
When the brake acts normally, the take-up reel
does
not turn clockwise while the supply reel
does
not rotate counterclockwise.
4-9