Dual CS 731 Q - Automatic Play and Control Functions; Continuous Automatic Play Setup; Muting Switch Functionality

The
automatic
set
down
point
is
designed
for
30
ст
and
17
ст
records
and
is
coupled
to
the
platter
speed
changeover.
Set
down
points
of
the
tonearm
are
determined
by
means
of
stop
of
spring
bolt of segment
(124) at the adjusting
bar (168). Limitation
of
the
horizontal
movement
of
the
tonearm
is
produced
by
stop
of
segment
on
adjusting
bar
(168)
which
is
lifted
off
only
during
set
down
by
the
main
lever
(167)
and
reaches
the
swivel
range
of
the
spring
bolt
on
the
segment.
On
completion
of
set
down
(lowe-
ring
of
the
tonearm
onto
the
record)
slide
bar
(168)
is
released
again
and
returns
to
its
neutral
position.
As
a
result,
this
is
out-
side
the
range
of
the
spring
bolt
so
that
unimpeded
horizontal
movement
of
the
tonearm
is
possible
for
playing.
Continuous automatic play
The
continuous
automatic
play
is
operated
by
turning
knob
(84)
to "00".
Switch
bracket
(179)
is actuated
by knob
(84).
Switch
rod
(180)
keeps
change
lever
(165)
in start
position.
After playing the record the tonearm returns automatically to
the
lead
in
groove
of
the
record.
This
process
will
be
repeated
until knob (84) is in position “17.
Adjustment point
Withdraw power plug. Remove turntable (3). Bring knob (84) to
position “оо”, Turn cam wheel to center position. The change-
over lever deflects the cam follower lever (U). By this means the
cam follower lever tip must be brought at least to the cam track
center. Adjustment by bending the switch rod (189).
Starting
Operation of push-button (59) “start” results in the following
functions:
a) The right hand pull magnet (142) operates cam followerlever
(165). At the same time the power switch (106) is operated
by the contact arm (127) coupled to the switching arm (78)
and the motor and turntable start to rotate.
b) This operation also releases start slide (39) which is drawn in
the direction of the cam wheel by means of the tension spring
(38). By this means the shut-off lever (8) on the cam wheel
(25) is brought into the range of the follower (M) (plate cone
22) and the cam wheel driven by this means.
Manual start
The detent (126) coupled to control arm (78) engages in the
square plate (125) when the tonearm is moved inward by hand
and retains the tonearm in this position. The power switch is
operated by the control arm and thus the motor and platter
start to rotate. After reaching the run-out groove of the played
record return of the tonearm and shut-off of the unit take place
automatically. If, on the other hand the tonearm is lifted off the
record
before
playing
is
completed
and
moved
onto
the
rest
by
hand, the pin of segment (124) disengages the detent (126) so
that
the
control
arm
is
returned
to
its
starting
position.
As
a
result, the power switch shuts off the power supply.
Muting switch
To prevent disturbing noises during automatic operation of the
tonearm the unit is fitted with a muting switch. Control of the
switch springs for both channels is effected by the cam wheel.
With the unit in neutral state the short-circuit of the pick-up
leads is eliminated.
Adjustment point
In neutral position of the cam wheel a contact distance of ap-
proximately 0.5 mm should be present between contact springs
(F) and short-circuit strips (L). If necessary bend short-circuit
strips.
Spray contact springs with suitable means.
167 91 124 134
Fig. 11
22M 25 A 37 128 36
Stopping
When
push-button
(59)
"зор"
is
operated
the
changeover.lever
(165)
is
brought
into
stop
position
by
means
of
the
left
hand
pull
magnets
(142).
As
a
result
the
start
slide
is
released
which
is
drawn in the direction
of the cam wheel by means of tension
spring (38). By this means the shut-off
lever is brought
into the
range
of
the
follower
on
the
platter
pinion
(PR)
and
the
cam
wheel (25) is thus driven.