Dual 521 - The Starting Sequence; Manual Start; Continuous Play; Muting Switch

Fig. 15
230
225
204
Fig.
16
Fig.
17
196
207
161
195
186
192
193
247
248
A
179
164
PR
166
161
a.)
b.)
The
Starting Sequence
When you
adjust the START/STOP
lever to the START
position,
the turn-on
lever (207) is rotated to the
outside and will trigger
the following
functions:
a) The turn-on
lever (207) rotates the
shift links (193) seated
on the riffled pins (183). At
the same time, the power switch
is turned on (135) and both
the motor (132) and
turntable
start rotating.
b) The
shift link (193) enters the
range of the reversing lever
which is forced into its start
position by the subsequent ro-
tation of the cam
wheel (161).
c)
Operation of the START/STOP
lever (48) will also release
the
start angle (191) that is pulled
towards the cam wheel
by the tension spring (192). The shut-off
lever isthus brought
into the range of dog M on the turntable pinion (PR)
(Fig. 17)
and the cam wheel is driven.
Manual Start
When the tone arm
is guided towards the
record manually, the
pawl (236)
coupled to the shift
arm (186) will
engage with the
square bolt
mounted in the deck
plate and will keep the
shift
arm in this
position. Coupled to the
shift arm is the shut-off
lever (189) that will
turn on the power
switch and thus initiate
the turntable
rotation. When the run-out
groove of the record
played has
been reached, the tone arm
is restored and the record
player is turned off by
automatic means. If you lift the tone
arm
before the end of play
and put it back onto its support, the
bolt
of segment (200) will
release the engaged position
of the pawl
(236) so
that the shift arm is returned
to its initial position and
the power switch will turn off.
Continuous Play
This
mode is operative when
you have adjusted the
knob (69) to
00
. The knob (69)
will rotate the reversing
angle (231) and the
!atter
is forced into the starting
position by the turn-on lever (207)
at the end of
record, the tone arm is restored
to its rest position
on the
support near the record rim. This
procedure will be repea-
ted until the
START/STOP lever (48) is adjusted to
STOP or the
knob (69) is
adjusted to no. 1 position.
Muting
Switch
The
muting
switch is
provided to
avoid
noisy lifting
and
lowering
of
the
tone arm
in the
auto
made. The
contact
springs of
both
channels
are
controlled
by the
cam
wheel. The
resulting
short-cir-
cuiting
of the
pickup
leads is
ineffective in
the rest
state
of the
record
player.
Adjustment
In the
zero
position of
the cam
wheel, a
contact
separation
of
about 0.5
mm
should exist
between
the
contact
springs
(F) and
the
shorting
straps (L)
in Fig.
16. I f
necessary,
bend the
shorting
straps.
Maintain
contact
springs in
good state
by a
spraying
agent.
Final
Shutting-off
The
shutting-off
and stop
functions
are control
led by the
reversing
lever U. Lever
U is
brought into
the stop
position by
the main
lever
(177) (longer
leg of the
reversing lever
towards the
cam
wheel
center). The
shut-off bar
(179) is dragged
during the
play
in
proportion to the
motion of
segment
(200). The
shutting-off
operation after
the end of
record is
triggered by the
dog (M) of
the turntable
(7) and by
the
shut-off lever
(A) in Fig.
17.
In
the shut-off
range for
records
116— 122 mm
in
diameter, the
shut-off lever (A)
approaches
the dog
under control
of the
shut-
off bar
(179).
(See Fig. 17
a). The dog
(M)
engages with
lever (A),
which
will displace
the cam
wheel (161)
from its zero
position
and make it
engage with
the pinion
(PR) (Fig.
17 b). The
main
lever (177)
returns the
tone arm
that can then
lower itself
on its
support.
When the
cam
wheel runs up to
its
zero-engagement
position,
the
nose
(186) of the
shift arm can
run into
the recess
left in the
cam
wheel and
operate the power
switch (135).
8