Dual 1229 Q - Automatic Cycling and Shut-off; Shut-off Mechanism Operation Guide

Record
Drop Fig.20 Record drop
Insert the appropriate spindle — AU 3 for
standard records (7 mm or 1/4" center
hole)
or AS
12 for 45 rpm records (38 mm or 1 1/2"
center hole).
To prevent faulty
operation, automatic re—
cord—changing operation is possible only
when the mode selector is in the
"multi"
position.
Record drop is
initiated by the rotation of
cam (165), whose cam surface
(AK) guides the
cam rocker (173), pushing the
change actator
stud (206) and
releasing a record by means
of the
automatic spindle. The main cam is
designed so that a record can drop
only when
the tonearm is above the
tonearm rest and
thus out of the
reach of the
largest possible
record (12" diameter).
Shut -
oft
and
Change
Cycle
The dog (M) on the
turntable platter gear
(PR) and the shut—off
lever (162) actuate
both the
change cycle at the end of
the
record as well as
the shut—off after the
last record in a stack is played.
At the end of a record, the tonearm
moves
towards the
center at an accelerated rate
due to the increased pitch of the
grooves.
This motion carries the
shut—off
lever
(162)
towards the dog by means of the shut—off
slide (253). The eccentric dog pushes the
shut—off lever (162)
back at each revolut—
ion as long as the tonearm advance is only
one normal record groove.
The run—out
groove
with its steeper pitch
moves the shut—off lever against the dog
with greater force, engaging the shut—off
lever
(162) and causing the main cam (165)
to be driven out of
its neutral position
by the turntable platter gear.
Shut-oft
Mechanism
Shut—off and
change functions are deter—
mined by the position of the cam
follower
lever (207). After every start or record
drop, the cam follower lever is
brought
to its stop
position by the main lever (184)
(longer end towards the center of the main
cam).
171
177
165 173 AK
172 151 212
Fig.21
Actuating change
or
shut—off
operations
PR M 163 162 253
195
255
188
270
234
184
203
13