Dual 502 - Cue Control Assembly Replacement; Detailed Replacement Steps; Starting and Shut-off Mechanism; Automatic Shut-off Operation

Fig.
9
Replacement of Cue Control Assembly
1.
Secure unit in
repair jig, and
lock to—
nearm.
2.
Move unit into head
position.
3. Disengage
compression
spring (199)
an
bearing yoke
(198). Turn
bearing
section
(177)
by 90 0 and
remove it. Also
detach
slide bar
(176).
4. Disengage
tension spring
(185), loosen
lockwasher (192)
and skating
lever (191).
5.
Remove lockwasher
(189) and slide
washer
(188). Remove
shut—off bar (160)
from
segment
(184).
6. Loosen hex
nuts (187). Remove segment
(184).
7. Remove
lockwasher
(166) and washer
(165),
disengage
catch (164).
8.
Remove
machine screw
(181). Hold
tonearm
bearing.
Unscrew hex nut
(180) and
com—
plete cue control
assembly
(178).
9.
Secure
tonearm against
dropping out
using
hex nut (206).
For
installation of the
cue control
assembly
(178)
proceed in the
reverse order.
When
mounting
the segment
(184) make
sure that
it is properly
adjusted as
described
below.
Starting and
Shut - off
Turning the tonearm (49) rotates the segment
(184) thus
actuating the power
switch (127)
via pawl
(164) and shift arm (170) and start—
ing motor (123) and platter (10) rotating.
The shut—off cycle after
playing a record is
initiated by the dog (M) of the platter (10)
and shut—off
lever (34).
The shut—off lever (34) is
guided onto the
dog by the
movement of the tonearm when play—
ing the record with the aid of the
shut—off
bar (160) proportionate to the groove lead.
The eccentrically mounted dog forces the
shut—off lever (34) back with each revolu—
tion as long as the advance of the tonearm
only amounts to the width of one groove (Fig.
17
a). Only the run—out groove with its in—
creased lead guides the shut—off lever (34)
onto the dog at a higher rate so that the
shut—off lever is
picked up and moves along
(Fig. 17 b).
As a result, the shift arm im brought into
its neutral position, the power switch inter—
rupting power supply. Simultaneously, the
lift actuating lauer (170) coupled to the
shift arm (170) is actuated and the tonearm
(49) lifted.
Adjustment
Points
1.
Segment
a)
Lock tonearm
(49). Move
unit into head
position. The center
hole (0 of segment
(184) should be
centrically above
the
frame
axis (46). The
play between
the
pawl
(164) and the
stop (A) of
segment
(184) should be
0.3 to 0.5
mm. This is
adjustable
after loosening
hex nuts (187)
and
by moving
the segment
(184).
b)
The shut—off point
can be changed
by the
eccentric pulley
an the segment
(184).
(Fig. 11).
Fig. 10
10
Fig.
11
34
37 160
7