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3-6. REMOVING THE CAM WHEEL AND POSITION POTENTIAL VOLUME
1) Remove the motor block from the mechanism block.
(See section 3-3, “Removing the motor block”) Also
remove the motor PCB, the capstan belt and the fly-
2) Remove the stopper ring from the capstan holder. Pull
off the cam wheel. (Refer to Fig. 3—12.)
3) Remove capstan holder securing screws 0, 0, 0 and
0. Remove the capstan holder.(Refer to Fig. 3—18.)
4) Remove the potentio gear. Unscrew the position
potential volume securing nut. (Refer to Fig. 3—14.)
5) To vreassemble, follow the directions in section
3-7,“Reassembling the cam wheel and position poten—
POTENTIAL GEAR I I
POTENTIAL VOLUME CAPSTAN HOLDER
3-7. REASSEMBLING THE CAM WHEEL AND POSITION POTENTIAL VOLUME
1) Attach the position potential volume to the capstan
holder and attach the potention gear. Attach the cap-
stan holder to the motor biock and tighten the secur«
ing screws. Align the mark on the potention gear with
the groove in the motor chassis as shown in Fig. 3—15.
2) Slide the cam wheel onto the capstan holder and po-
sition it so that the eject lever fits into the slot in the
cam wheel and the center of the mark on the cam
wheel aligns with the center of the chassis groove.
MARK IA) MARKIB)
Take care not to scratch the gear. When replacing
with a new partuapply molybdenum grease to the por-
tion of the capstan holder indicated by the slanted
lines and the cam portion of the cam wheel before as—
3) After confirming that the positions of the marks on the
potention gear and cam wheel are aligned with the
groove in the motor chassis, attach the stopper ring.
MARK tCl VVVV‘I o-mssrs \
IV. MECHANICAL ADJUSTMENT
: 4-1. POTENTIAL VOLUME PRESET VOLTAGE ADJUSTMENT (Refer to Fig. 4-1, 4-2)
PRE- SET VOLTAGE
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 the A direction.
b. Connect the digital voltmeter as shown in Fig. 4—1.
0. With power ON, adjust VR2‘so that the voltage
reading on the Digital DC Voitmeter is 1.13V.
2) HIGH VOLTAGE ADJUSTMENT
a. With power OFF, turn the OPERATE PULLEY fully
with your fingers in B direction. (PLAY DIRECTION)
‘b. With power ON, adjust VR1 so that the voltage
reading on the Digital DC Voltmeter is 9.08V.
_.' M3,). Repeat step t) and 2).
._ 4) With power OFF, connect the connecting cord of the
M” T A [IllllllllIIIILllIIlIIIlIlI CAM WHEEL
GMARK OMAR“ CHASSIS
5) Remove the Cassette lid, Front panel and Bottom
(Refer to l. DISASSEMBLY)
6) a. Turn the power ON
b. Adjust VR1 slightly so that the center of marker 9
coincides with the center of marker 0 in the STOP
mode as shown on Fig. 4-2. (The marker 0 on the
CAM WHEEL can be seen clearly by lighting it from
c. Set the IPLS switch to ON.
d. 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 clock-
wise and the supply reel does not rotate counter