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JVC QL-A2 Service Manual

JVC QL-A2
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Page #5 background image
5.
Operation
of
Automatic
Mechanism
Change
cycle
mechanism:
projection
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
3.
The
engagement
is
very easy
to
move
as
it
simply
rests
Platter
gear
on
the
lower
trip.
On
the
music
section
of
the
record
groove
the
engagement
moves
so
slightly
that
it
is
Fig.
2
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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JVC QL-A2 Specifications

General IconGeneral
Drive SystemDirect Drive
MotorDC servo motor
Speeds33 1/3 and 45 rpm
PlatterAluminum die-cast
Wow and Flutter0.03% WRMS
Effective Length220 mm
Overhang15 mm
TonearmStatic balance S-shaped tonearm

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