Dual 1229 Q - Manual Operation and Switching Functions; Stop Switching and Muting Switch

Fig. 18
Stop
position
173
165
234
Fig.
19 Muting
switch
270 262 255
Cam
wheel at
zero:
Contacts
of
muting
switch
opened
Cam
wheel is
turning:
Contacts
of
muting
switch is
closed
207
168
192
248
195
196
252
276
To
prevent
malfunctioning, the operating
switch
is locked during the start cycle
(that
is, while the main cam is
turning).
Just
before the main cam reaches
its
neutral position (at the end
of the chan—
ge cycle), the
start lever (248) is pus—
hed
clear of the main cam by the
angular
part of the main cam. This
restores the
switch lever
and operating
switch
to their
original positions.
After installation
and also
after moving the changer, the
unit should be started with the tonearm
locked on the rest. This will automatically
readjust the shut—off lever, which may
haue shifted out of position.
Manual Start
When the tonearm is
swung inward by hand,
the pawl (273) on the switch arm
(188) drops
into a sciare bolt on the
base plate, holding
the switch arm in this positions and
the
ilder wheel (131) in contact with the plat—
ter.
The slide (167) linked with the switch
actuates
the power switch and starts the
turntable platter rotating.
On reaching the run—out groove, the tone —
arm automatically returns to its rest po—
sition and the unit shuts
itself off. How—
over, if
the tonearm is lifted off the
record manually and returned to the rest,
the tabs of the arm segment (201) release
the pawl (273). The torsion spring (187) then
returns the switch arm to its initial po—
sition,
opening
the
power
switch and dis—
engaging the
idler wheel.
Stop
Switching
When the operating lever is moved to "stop",
the starting lever is pushed forward. As a
result, the shut—off linkage comes into con—
tact
with the gear pinion on the turntable,
and the
cam is
rotated.
The swinging lever
remains in its stop
position. When the
tone —
arm is
on its reist and
the operating
lever
is
pushed to
"stop", the
operating lever
must
not jam.
Short Circulter
To prevent the noise of
the change and start/
stop cycles from being sent through the audio
system,
the apparatus is fitted with a short—
circuitin (muting) switch. The switch springs
for both channels arm actuated by the main
cam. In the tonearm rest position, the mut—
ing switch is opened.
12