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44. POTENTIOMETER PRESET VOLTAGE ADJUSTMENT(Refer to fig.4—4 to 4-5)
OISCONNECT
CAM
MOTOR
OPERATE
PULLEY
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.
(EJECT
DIRESTION)
b. Connect the digital voltmeter as shown in Fig. 4-4.
c. With power ON, adjust VR2 so that the reading voltage
on the Digital DC Voltmeter is 1.15V (DC).
2) HIGH VOLTAGE ADJUSTMENT
a. With power OFF, turn the OPERATE PULLEY fully
with your fingers in B direction.
(PLAY
DIREC-
TION)
b. With power ON, adjust VR1 so that reading voltage
on the Digital DC Voltmeter is 9.08V (DC).
3) Repeart step 1) and 2).
4) With power OFF, connect the connecting cord of the
CAM MOTOR.
5) Remove the Cassette lid, Front panel and Bottom cover.
(Refer to 1. DISASSEMBLY)
POTENTIOMETER
PRE-SET
VOLTAGE
LOW
DIGITAL
VOLTMETER
DC
CAPSTAN
MOTOR
SERVICE MANUAL
FLYWHEEL
Fig.4-4.
Fig.4-5.
. Set to power ON.
. Adjust VR1 slightly so that the center of Marker (A)
coincides with the center of Marker (B) (should be
within the range between X and Y) at STOP Mode as
shown on Fig. 4-5. (The marker (A) on the CAM
WHEEL
can be seen clearly by lighting it from the
back.)
. Set the IPLS switch to ON.
. Confirm that head and pinch roller do not move up and
down when the FF and REW buttons are alternately
pressed.
. Tun 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.
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