Dual 621 - Stopping and Muting Mechanisms; Tonearm Set-down Point Adjustment

Stopping
When control lever is set to "stop position the start slide (38)
which is pulled towards the cam by means of tension (34), be-
comes free. As a result, the shut-off lever is moved into the range
of dogs cam. The lever remains in its stop position.
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 camwheel.
With the unit in neutral state the short circuit of the pick -up
leads is eliminated.
Adjustment
In zero position of the cam there should be a clearance of ap-
proximately 0.5 mm between the contacts of the muting switch.
This clearance should be adjusted by bending the muting switch
contacts. The contacts should be sprayed with a suitable cleaning
agent.
Shut-off
The shut-off and
stop functions depend on the Position of the
guide lever (U). The guide
lever (U) is brought to stop position
by the main
lever (183) after every
Start (
longer end of the guide
lever towards
cam wheel centre).
The shut-off
bar
(161) is
guided along in proportion to the mo-
vement of the
segment (208).
The
shut-off
procedure is
imitated
after
a
record
has
been
played
by
the dog
(M) of
the
platter
and the
shut-off lever (A).
The
shut-off
lever (A)
is
moved
towards
the
dog
(M)
of the plat-
ter
within
the
shut-off
range
(record
diameter
116
mm
to
122 mm)
(Fig.
16 a).
The
dog
engages
the
shut-off lever
(A).
The
cam
wheel
(16) is
moved
from
0
position
and
engage
with
the
drive
pinion
of
the
platter
(Fig.
16 b).
The
main
lever
(183)
guides
the
tonearm
back
and
effected
the
tonearm to
return to
its
rest
position.
During
the
running
in of
.
the
cam
wheel
into 0
position
the
roll
(42) of
the
switch
arm
(41)
can
run
into the
cut-out
provided at
the
cam
wheel and
achate
the
power
switch
(116).
Adjustment
Points
Tonearm
set-down point
The set-down
point can be varied with
the eccentric bolt
(176).
if the
stylus sets down onto the
record too far inside or
outside
turn
eccentric bolt (176) in left
or right direction.
Fig.
15
Fig. 16
a.)
b.)
Fig
17
45 U/min 50Hz
45
U/m
in
60Hz
33
U/min50Hz
33U/min
60Hz
11