Dual 521 Service Manual

Fig.
12
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B IENEN
WO min ..i.
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204 219
223
218
Tone
Arm
Lift
When
you
move the
lift
control bar
(218) to
the LIFT
position
V
, the
tone arm
will be
lifted
and in
position LOWERY
it will
be lowered
through the lift cam
(219)
and
the
setting bar
(204).
The
tone arm
lift has
priority
over the
set-down
mechanism.
When
the
record player
is started
with the
control
bar
(218) in
the
LIFT
position V
, the
set-down
mechanism
will
move the
tone arm
across
the record
in the
auto
mode.
Lowering of
the
tone arm
will take
place
only atter
you have
adjusted
the
control
bar (218)
to
the
POWER position
1.
The
height of lift
should be
3 to 5
mm; it can
be
adjusted by
the setscrew
(40).
To
Replace the Lift Plate (158)
1.
Remove the main lever (177) and
the lock washer (242).
Rotate
the
setscrew (42)
until guide
bearing (241) and set-
ting bar
(204) are
released.
Remove lock washer (228) and
setting bar
(204).
2. Unhook the tension spring
(212), loosen lock washer (216)
and remove
skating lever (215).
3. Remove lock
washer (206) and disk
(205). Detach the shut-
off bar (179) from segment
(200).
4.
Remove
hex. nuts (202) and
segment
(200).
5.
Remove the
screws (15) and
the lift plate
(158).
To reassemble, proceed in reversed
order.
Tone Arm
Control
The tone arm motions
for auto lowering and
lifting are con-
trolled
by cams under the
cam wheel (161) while
the wheel
rotates through 360 0 .
Lifting and
lowering motions are
controlled by the main
lever
(177)
and lifting bolt while
the horizontal motions of
the tone
arm are controlled by
lever (177) with the segment
(200).
The
lifting/lowering mechanism is
active for 30 -cm and 17 -cm re-
cords; it is coupled to the turntable-speed
change-over function.
The tone -arm set-down points are
determined by the spring pin
of segment (200) abutting against the
setting bar (204). The
horizon-
tal motion is limited by the segment
abutting against the setting
bar
(204) which is lifted only
during the set-down
Operation by
the main lever (177) and thus comes
into the sluing range of the
spring pin provided on the
segment.
After the
tone arm has been set
down on the record, the
setting
bar
(204) is released and
returns to its nromal
position, thus es-
caping
from the range of the
spring
rin.
The tone arm
is thus free
to move in horizontal direction
during the play-back.
Fig. 13
241
72
177
202 200
204
242
241
40
179
215

Dual 521 Specifications

General

Drive System	Belt drive
Speeds	33 1/3 and 45 RPM
Weight	5.5 kg
Anti-Skate	Yes
Stylus	Elliptical
Output	Depends on cartridge