JVC QL-A2 Service Manual page 5

Quartz auto-return turntable
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1. During
playing,
the notch
of the main
gear position
relative to the turntable spindle gear is as shown in Fig.
2. As the projection
is away from the engagement, the
main gear does not rotate even though the turntable.
2. As playing
proceeds,
the trip slide moves toward the
center of the turntable following the movement of the
tonearm as shown in Fig. 3.
Engagement
Platter spindle gear
returned by the tip of the projection. Censequently, the
turntable spindle gear does
not engage with the main
gear and thus does not trigger the auto-return operation.
4. When
playing ends and the pick-up cartridge enters the
lead-out groove which
is spaced
out, the engagement
advances more then it is returned by the projection.
Because
of this, the
engagement
is pressed
by the
projection as shown in Fig. 4, causing the main gear to
turn and engage with the turntable spindle gear. Thus
the change cycle is started.
5. During the return operation the engagement and lower
trip which
have moved
are returned
to their original
position by the reject lever coming into contact with the
Fig. 3
Fig. 4
bottom
of the lower trip. At this moment the switch
lever operates with the
help of the main
gear
cam,
switching off the power just before the rotation should
stop.
This completes the automafic cycle.
Tonearm lift and return mechanism:
1. When
the main
gear starts to rotate
at the end of
playing, the return lever rotates under the action of the
main gear cam to press the elevator cam. The upward
movement of the elevator cam is directly converted into
movement
ofthe elevator, lifting up the tonearm. (Fig.
5)
2. The tonearm
is returned by the arm
lever the end of
which presses it as the main gear rotates. (Fig. 6)
Return lever
Trip Slide
Elevator cam
Fig. 5
Arm
Lever
Fig. 6
QL-A2
=4s
No. 244

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