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Technics SL-BD21 - Page 11

Technics SL-BD21
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@
OPERATIONAL
DESCRIPTION
OF
MECHANISM
©
Manual
start
(Fig.
1)
1.
Shift
the
tonearm
to
the
turntable
side.
The
PU
board
rotates
and
the
pin
of
PU
board
applies
a
force
to
the
switch
control
piece
in
the
direction
of
arrow
@.
2.
The
switch
control
piece,
switch
levers
(A)
and
(B)
move
in
the
direction
of
arrow®.
3.
The
pin
Of
switch
lever
(B)
holds
the
contact
of
microswitch
(power).
Drive
circuit
power
supply
turns
ON
and
motor
starts
operating.
4,
When
the
pin
of
PU
board
moves
to
point
@,
the
switch
contro!
piece
moves
in
the
direction
of
arrow
@,
and
the
switch
control
piece
is
locked
by
the
lock
pin
of
the
mechanism
board.
Microswitch
keeps
turning
ON.
Cueing
up/down
(Fig.
2)
1,
When
the
cueing
knob
is
set
to
up/down
position,
the
cueing
lever
and
cueing
cam
rotate
via
the
cueing
rod.
Rotation
in
the
direction
of
arrow@:
Cueing
up
*Rotation
in
the
direction
of
arrow@:
Cueing
down
2.
The
lift
rod
is
pushed
up
or
down
by
the
cueing
cam
operation
Note:
The
cueing
cam
takes
about
6~8
sec.
to
move
from
point
@
to
point®.
(Cueing
up
to
cueing
down)
Auto
return
(Fig.
3,
4)
1.
Tonearm
moves
to
the
center
of
turntable.
PU
board
rotates
to
hold
the
actuating
rod.
(Arrow
@)
2.
Actuating
lever
rotates.
(Arrow
@)
Friction
link
and
actuating
link
are
pushed
out
(direcstion
@
and
@),
then
small
gear
engages
with
main
gear
to
rotate
the
latter.
3.
Main
gear
rotation
causes
the
drive
plate
to
move
in
the
direction
of
arrow@.
*The
projection
@
of
drive
plate
pushes
the
cueing
cam
to
rotate
it
for
cueing
up.
*The
projection
®
of
drive
plate
touches
the
pin
of
PU
board
to
rotate
it
in
the
direction
of
arrow@,
thereby
shifting
the
tonearm
back
to
the
rest
position
4.
As
the
main
gear
rotates
further,
drive
plate
moves
in
the
direction
of
arrow,
thereby
resetting
the
mechanism.
Pin
of
PU
board
Switch
control
piece
6
‘Switch
lever
(A)
\
Switch
lever
(B)
(Fig.
1)
Cueing
cam
Cueing
lever
Actuating
link
Friction
link
Actuating
lever
(Fig.
4)
ee
PU
board
\
Cueing
Actuating
rod
cam

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