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  9. Dual 1224 User manual

Dual 1224 User manual

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ition
May
1974
Technical
data
Current
type
Line
voltage
Drive
Dual
1224
Drive
Dual
1225
Power
consumption
Current
requirements
Dual
1224
Current
requirements
Dual
1225
Platter
Platter
speeds
Pitch
control
Wow
and
flutter
Signal-to-noise
ratio
Dual
1224
Signal-to-noise
ratio
Dual
1225
Tonearm
Pick-up
head
(cartridge
holder)
Stylus
pressure
Pick-up
cartridge
Dimensions
Weight
Dual
1224
Weight
Dual
1225
Dual
1224
Dual
1225
Service
Manual
AC
50
or
60
cycle,
with
appropriate
motor
pulleys
110/130
V
and
220/240
V
selector
Two-pole
Dual
single-phase
asynchronous
motor
Four-pole
asynchronous
motor
<
10
Watt
approx.
60
mA
at
220
V
50Ocycle,
approx.
115
mA
at
110
V
60
cycle
approx.
64
mA
at
220
V
50
cycle,
approx.
115
mA
at
110
V
60
cycle
1.45
kg,
270
mm
@
33
1/3
and
45
rom,
automatic
tonearm
setdown
coupled
to
speed
selector
Adjustment
of
approx.
1
semi-tone
(6
%)
at
both
platter
speeds
<+
0.15
%
rated
in
accordance
with
DIN
45
507
Rumble
signal-to-noise
ratio
>
55
dB
Rumble
unweighted
signal-to-noise
ratio
>
35dB
in-accordance
with
DIN
45'500
Rumble
signal-to-noise
ratio
>
56dB
Rumble
unweighted
signal-to-noise
ratio
>
37
dB
in
accordance
with
DIN
45
500
Torsionally-rigid
tubular
aluminium
arm
with
vertical
pivot
mounting,
horizontal
self-adjusting
pivot
mounting
Removable,
suitable
for
acceptance
of
all
(Dual
1224
all
piezo
electric)
cartridges
having
1/2”’
mounting
and
a
deadweight
of
2
—
10
grams
(including
mounting
fixtures)
Continuously-adjustable
from
O
—
8
p,
reliable
as
from
1
p
stylus
pressure
See
separate
data
sheet
329
x
274
mm
(+
2
mm
tonearm
overhang)
3.9
kg
4kg
Dual
Gebriider
Steidinger
-
7742
St.
Georgen!/Schwarzwald
Fig.
1
Pick-up
Connection
Diagram
right
channel
left
channe!
a
1
Da
3
-——|
>
|
re
i
I
t
gfe
=
———__-¢
q
:
|
1
s--s
ee
at
a1
fiettos
7
ao
Lm
oe
Ss
TR
~
|
\
C1
|
!
|
'—~
Tonearm
audio
cable
The~
=
—-471
°
i
me
3
|
I
dl
an
a)
with
miniature
plug
5-pin
|
he
+
;
Q,
rey
Q9
3
Muting
switch
i
ft
c
oa
|
right
channel
!
:
red
lead
|
1
|
left
channel
:
|
white
lead
|
|
|
|
|
|
b)
with
phono
plug
|
{
|
i
1!
TT]
{
!
:
ot
|
|
black
1
fl
white
L
ee
(red)
(yellow)
black
right
channel
left
channel
red
white
‘Mass
right
channel
Mass
left
channe!
green
blue
Qo
|
en
een
ren
eee
Mass
sheet
Foto
rey
heres
et
ee
a
“”
oan
ee
ne
a
a
4
SSS
oe
a
a
ae
ae
|
Contact
plate
at
tonearm
head
!
Tonearm
head
|
plug-in
cartridge
|
|
ep
ef
:
Spring
contacts
between
|
head
and
tonearm
t
red
i
white
|
(}
green
|
M,
l
blue
Cartridge
Pa
|
Record
Q
SS
inner
side
of
groove
1
outer
side
of
groove
left
channel
right
channel
Contents
Technical
Da
Pick-up
Conn
Motor
and
Dr
ta
ection
Diagram
ive
Pitch
Control
Tonearm
and
Replacing
th
Replacemagnt
Tonearm
Anti
Tonearm
Guid
Tonearm
lift
Start
Cycle
Manual
Start
Stop
Switchi
Platter
does
not
run
when
unit
is
plugged
in
and
start
Switch
operated
Platter
does
not
reach
required
speed
Rumble
in
reproduction
Correct nominal
speed
obtained
only
at
extreme
settings
of
pitch
control
Suspension
e
Complete
Tonearm
and
Bearing
Assembly
of
Tonearm
-skating
Device
Pick-up
head
not
parallel
to
platter
e
Mechanism
Tonearm
misses
edge
of
record
Tonearm
strikes
record
during
change
cycle
Tonearm
does
not
move
onto
record
when
drop
cycle
ist
started
Tonearm
lowers
too
quickly
when
drop
cycle
is
started
Tonearm
returns
to
rest
immediately
after
being
placed
on
record
manually
|
Ng
Muting
Switch
Record
Drop
Shut-off
and
Change
Cycle
Shut-off
Mechanism
Spare
Parts
Lubrication
Platter
stops
after
automatic
set-down
of
tonearm
The
last
record
of
a
stack
keeps
repeating
After
adjusting
the
tonearm
set-down
point
for
7"
records
the
set-down
point
is
not
correct
for
12"
records
Record
drops
when
unit
is
switched
to
"stop"
Records
do
not
drop
Stylus
slips
out
of
playing
groove
Vertical
tonearm
movement
restricted
during
set-—down
Disturbing
noises
during
change
operation
No
sound
Motor
does
not
shut
off
Acoustic feedback
with
Exploded
Views
ai
oa
owwo
wo
wo
Oannt
aan
wm
10
10
11
17
4
12
AZ
12
13
13
13
14
14
14
14
14
14
15
21
20
Figve
2
1
Hida
ee
RRS
EPR
AGEGOOOOL
CODD
BGO
11
104
10
109
126
108
130
152
Fig.
3
Motor
suspension
and
platter
drive
Dual
|
AMMA
MMEM
Rs
oe
a
ad
1224
———
[|
EE
ive
a
1
‘Tl
ee
77,
tt
139
125
156
Motor
suspension
and
platter
drive
Dual
7225
11
104
10
109
126
108
130 152
Motor
and
Drive
The
platter
and
associated
mechanism
are
driven
on
the
Dual
1224
by
a
two—pole
asyn-
chronous
motor
(125)
and
on
the
Dual
1225
by
a
four-pole
asynchronous
motor
(150).
Both
motors
have
a
rotor
balanced
at
two
levels,
polished
bearing
surfaces
and
en-
Sure
vibrationfree
running.
In
addition,
the
four-pole
motor
is
distinguished
by
an
extremely
small
stray
magnetic
field.
The
speed
of
the
motors
is
constant
over
a
supply
voltage
range
of
+
10
%.
Deviations
in
speed
depend
on,
and
are
proportional
to,
the
line
frequency.
Adaptation
of
the
motor
to
50
or
60
Hz
power
is
accomplished
by
changing
the
motor
pulley
(137/139).
Two-pole
motor
(Dual
1224):
Pulley
for
50
Hz
ATG,
NOx.
292:
69:6
Pulley
for
60
Hz
Art.
No.
2342897
Four=pole
motor
(Dual
1225):
Pulley
for
50
Hz
Art.
No.
232
898
Pulley
for
60
Hz
Art.
No.
232
899
137
150
156
The
motor
pulley
is
secured
to
the
motor
shaft
by
a
setscrew.
When
a
pulley
is
re-
placed
or
exchanged
it
must
be
set
at
the
correct
height
(see
Fig.
4).
The
platter
is
driven
by
the
idler
wheel
(152)
which
is
automatically
disengaged
From
the
motor
pulley
when
the
unit
is
shut
off
in
order
to
protect
its
driving
surface.
Platter
speeds
of
33
1/3
and
45
rpm
are
se-
lected
by
raising
or
lowering
the
idler
wheel
(152)
to
the
appropriate
step
on
the
motor
pulley.
When
the
selector
lever
(33)
is
moved,
the
selector
segment
(108)
rotates.
This
causes
the
lever
(130)
fitted
in
the
slot
of
the
selector
segment
to
move
in
a
vertical
di-
rection.
The
idler
wheel
(152)
mounted
on
the
swinging
arm
(155)
is
lifted
off
the
mator
pulley
and
set
down
again
on
the
mo-
tor
pulley
step
for
the
appropriate
speed.
Pitch
Control
For
platter
speeds
of 33
1/3
and
45
rpm
the
unit
incorporates
a
power-—independent
pitch
control
which
permits
a
platter
speed
variation
of
up
to
6
&
(approximately
one
semi-tone).
When
the
pitch
control
knob
(10)
is
turned,
the
switch
segment
(108)
and the
switch
lever
(130)
attached
to
it
are
moved
up
or
down.
This
vertical
displacement
changes
the
position
of
the
idler
wheel
on
whatever
step
of
the
motor
pulley
it
has
been
placed,
by
the
speed
selector,
and
due
to
the
ta-
pered
shape
of
the
pulley
effects
approxi-
mately
+
3
%
variation
in
speed.
Trouble
Cause
Platter
does
not
a)
Current
path
to
motor
run
when
unit
is
interrupted
plugged
in
and
b)
Idler
wheel
(152)
not
start
switch
in
contact
with
platt-
Operated
er
es
Motor
pulley
loose
Platter
does
not
a)
Motor
pulley
is
not
reach
required
correct
for
local
speed
line
frequency
b)
Slip
between
idler
wheel
(152)
and
motor
pulley
or
platter
c)
Excessive
friction
in
motor,
idler
wheel
or
platter
bearings
Rumble
in
re-
Worn
idler
wheel
production
Idler
wheel
does
not
contact
motor
pulley
cor-
rectly
Correct
nominal
speed
obtained
only
at
extreme
settings
of
pitch
control
Fig.
5
Motor
field
connec—
tions
(less
voltage
selector)
Coil
II
not
in
2-pole
motor
which,
according
to
model,
can
only
be
used
for
220
y
or
110
V
or
150
¥
Position
of
idler
wheel
Fig.
4
Remedy
a)
Check
connection
at
switch
plate
and
voltage
selector
b)
Check
switch
lever
assembly
(130)
°
Tighten
motor
pulley
a)
Change
motor
pulley
b)
Clean
friction
surfaces
of
idler
wheel,
motor
pulley
and
turntable
platter.
If
necessary,
replace
idler
wheel.
Once
the
drive
surface
of
the
platter
has
been
cleaned
do
not
touch
it
with
your
fingers
c)
Clean
and
oil
bearings
Replace
idler
wheel
(152),
clean
platter
drive
surface
and
motor
pulley
with
grea-
seless
solvent.
(Once
surfaces
are
cleaned
do
not
touch
them
with
your
fingers).
Adjust
position
of
idler
wheel
by
turning
adjustment
screw
(12)
so
that
the
fine
speed
adjustment
knob
(10)
is
in
the
center
position
by
correct
nominal
(Fig.
4).
Fig.
6
Motor
field
connec-
tions
(with
voltage
selector)
(ON
pee
GC
|
CSW
eee
|
Tonearm
and
Tonearm
Suspension
The
tonearm
of
the
Dual
1224
and
1225
is
counter
balanced
and
pivot
mounted
verti-
cally
and
horizontally.
This
provides
ex-
tremely
favourable
tracking
characteristics.
The
tonearm
head
is
removable.
To
aid
in
replacing
or
adjusting
the
tonearm
head
a
hole
is
provided
in
the
chassis
to
facili-
tate
adjustment
of
the
tonearm
head
witheut
first
removing
the
tonearm.
Before
setting
the
correct
stylus
force
for
the
cartridge
which
has
been
installed
the
tonearm
should
be
balanced
with
the
stylus
force
setting
at
zero.
It
is
recommended
that
balancing
should
be
carried
out
in
the
direct
vici-
nity
of
the
tonearm
rest.
This
is
carried
out
by
rotating
the
counterweight.
Fig.
7
Tonearm
bearing
assembly
Fig.
8
Tonearm
bearing
assembly
(view
from
underneath)
68
58
55
241
245
212
225
223
The
counterweight
is
designed
so
that
it
can
balance
cartridges
weighing
1
-—
10
gq.
For
shock
absorption
(absorption
of
brief
shocks)
the
counterweight
is
flexibly
moun-
ted
on
the
tonearm
and
secured
to
prevent
unintentaional
rotation.
The
tonearm
head
is
designed
to
accept
all
cartridges
with
internationally
standard
1/2"
mounting
cen-
ters
and
weighing
not
more
than
10
gq.
Sty-
lus
force
is
set
by
rotating
the
graduated
spring
housing
(ses
and
thus
tensioning
or
slackening
the
coil
spring
contained
the-
rein.
The
scale
is
calibrated
for
an
ad-
justment
range
of
O
-
5
p,
permitting
ac-
curate
setting
within
that
range
in
0.5
p
steps.
Replacing
the
Complete
Tonearm
and
Bearing
Assembly
To
replace
the
complete
tonearm
and
bearing
assembly
we
recommend
proceeding
as
follous:
1.
Tighten
unit
in
repair
jig,
set
stylus
force
scale
to
zero
and
lock
the
tonearm
in
position
2.
Turn
unit
upside
down,
remove
retainer
spring
(188)
and:
unsolder
tonearm
leads
3.
Remove
main
lever
(223),
disengage
spring
(256)
4.
Remove
lock
washer
(227)
and
skating
disc
(226),
remove
shut-off
slide
(225)
from
eccentric
pin
on
segment,
ensure
ball
(224)
does
not
drop
out
5.
Slacken
hexagon
nuts
(244),
remove
seg-
ment
(245),
then
remove
tonearm,
ensu-
ring
that
bearing
pivot
(39)
and
compres-
sion
spring
(40)
do
not
drop
out.
Tonearm
complete
with
bearing
frame
assem-
bly
should
be
refitted
in
reverse
order.
The
unit
is
in
normal
position.
Insert
tonearm
complete
with
bearing
frame
assembly
and
lock
in
rest.
With
tonearm
held
in
place
turn
unit
upside
down.
Place
segment
(245)
in
position
and
fit
hexagon
nuts.
Replacement
of
Tonearm
To
remove
the
tonearm
from
the
bearing
fra-
me
unsolder
the
tonearm
leads
and
set
the
tonearm
tracking
force
scale
to
zero.
Uns-~
creu
locknut
(65)
with
setscrew
(64)
and
bearing
screw
(68)
(left-hand
thread).
Care-
fully
remove
tonearm
from
bearing
frame.
Tonearm
Anti—skating
Device
The
geommetrically
caused
skating
force
ac-
ting
on
any
tonearm
is
eliminated
to
a
lar-
ge
extent
in
the
case
of
the
Dual
1224
and
1225
by
means
of
a
precision
antiskating
de-
vice.
The
skating
force
is
dependent
on
the
tone-
arm
geometry,
on
the
stylus
force
and the
tip
radius
of
the
cartridge
stylus.
The
in-
ward
pull
of
the
tonearm
caused
by
the
skating
effect
leads
not
only
to
undesirab-
le
jumping
of
the
tonearm
when
set
down
on
the
record
but
also
unequal
forces
on
the
two
opposite
groove
walls
with
resultant
unfavourable
effects.
These
can
be
correc=
ted
with
the
aid
of
a
suitable
anti-skating
device.
By
turning
the
knob
(69)
of
the
an-
ti-skating
device
located
on
the
cover
the
asymmetrical
plate
cam
(238)
is
moved.
This
plate
cam
has
tuo
different
curvatures
which,
according
to
the
different
scales
used,
for
spherical
and
elliptical
tip
styli
and
for
CD
4
pick-up
cartridges,
move
the
skating
lever
(241)
out
of
its
position
of
rest
and
transmit
the
counter
force
to
the
tonearm
by
means
of
the
tension
spring
(256).
Skating
adjustment
is
set
at
the
works
for
conical
styli
with
a
tip
radius
of
15
+
2
um
and
for
elliptical
styli
with
measure
ments
of
5/6
and
18/22
um
and
also
for
CD
4
cartridges.
The
hexagon
nut
(239)
is
firmly
tightened
and
locked
with
paint.
Readjust-
ment
should
only
be
attempted
with
the
aid
of
the
Dual
Skate-O-Meter
and
the
L
096
test
record.
This
is
best
done
by
an
autho-
rised
Dual
service
station.
Trouble
Tonearm
head
not
located
parallel
to
plat-
ter
Cause
Shocks
incurred
during
transport
have
alte-
red
the
location
of
the
tonearm
head
on
the
tonearm
tube
Remedy
Remove
platter,
slacken
the
screw
on
the
tonearm
head
with
the
aid
of
a
screwdriver
inserted
through
the
hole
in
the
chassis
provided
for
this
purpose.
Retighten
screw
after
aligning
the
tonearm
head
(Fig.
10).
Fig.
9
Anti-skating
force
a)
Anti-skating
force
O-set-
ting.
No
compensation
of
the
skating
force
ta-
kes
place
as
a
result
of
the
action
of
the
tension
spring
at
the
fulcrum
of
the
tonearm.
Anti-skating
mechanism
set
to
“’1.5”’
on
the
scale
for
elliptical
styli.
Tone-
arm
on
tonearm
rest.
The
tension
spring
pro-
duces
the
anti-skating
force
which
is
transmit-
ted
to
the
tonearm
via
the
segment,
The
V-spring
presses
the
skating
lever
against
the
plate
cam.
b
—
c)
As
“b”
but
tonearm
abo-
ve
platter.
Fig.
17
Tonearm
guide
mechanism
199
173
132
A
193
180
223
202
212
245
Tonearm
Lift
(Cue
Control)
The
tonearm
lift
permits
the
tonearm
to
be
set
down
on
the
record
safely
at
any
desi-
Ted
point
outside
the
shut-off
area,
Moving
the
tonearm
lift
handle
(44)
for-
ward
causes
lift
cam
(235)
to
rotate.
This
movement
is
transmitted
via
positioning
slide
(212)
to
the
lift
pin
which
then
ralses
the
tonearm.
Fig.
12
Tonearm
lift
(tonearm
raised)
44
235
236
212
Tonearm
Guide
Mechanism
A
guide
groove
located
on
the
underside
of
the
main
cam
(193)
controls
the
automatic
lift
and
set-douwn
of
the
tonearm
as
the
cam
rotates
through
360.
Tonearm
lift
and
lowering
are
controlled
by
main
lever
(223)
and
lift
screw
(249).
Horizontal
movements
are
controlled
by
the
main
lever
(223)
and
the
segment
(240).
Automatic
tonearm
set-down
is
designed
for
12",
and
7"
records
and
is
coupled
to
the
platter
speed
selector.
Set-—down
points
are
determined
by
the
spring
pin
of
seg-
ment
(240)
contacting
the
positioning
slide
ee
which
is.
only
raised
by
the
main
lever
223)
during
the
change
cycle
and
thus
mo-
ves
within
reach
of
the
spring
pin
fitted
on
the
segment.
On
completion
of
set—down
or
change
cycle
(tonearm
sets
down
on
the
record)
the
positioning
slide
(212)
is
released
again
and
returns
to
its
normal
position.
It
thus
moves
out
of
reach
of
the
spring
pin
permitting
the
tonearm
to
move
horizontally
without
hindrance
while
playing
the
record.
After
moving
the
tonearm
(by
hand)
to
the
desired
spot
on
the
record
the
tonearm
lift
handle
is
tapped
lightly
(to
the
rear)
to
release
the
mechanism.
The
positioning
slide
(212)
is
thus
relea-
sed
and the
tonearm
descends
slowly,
con-
trolled
by
the
viscosity
damped
lift
pin.
The
height
of
the
stylus
above
the
record
can
be
varied
from
zero
to
6
mm
by
turning
adjuster
screw
(43).
Turning
to
the
right
increases
the
height,
turning
to
the
left
reduces
the
height.
251
43
249
245
Trouble
Tonearm
misses
edge
of
record
Tonearm
strikes
re~,
cord
during
change
cycle
Tonearm
does
not
move
onto
record
when
drop
cycle
is
started
Tonearm
lowers
too
guickly
when
drop
cycle
is
started
Tonearm
returns
to
rest
immediately
af-
ter
being
placed
on
record
manually
Start
Cycle
Cause
a)
Record
setting
incorrect
b)
Set-down
point
incorrectly
adjusted
c)
Record
not
stan-
dard
size
d)
Friction
surfaces
of
tonearm
clutch
dirty
Tonearm
height
ad-
justment
incorrectly
set
Excessive
damping
caused
by
dirt
in
si-
licone
oil
in
lift
tube
Insufficient
damping
caused
by
improper
addition
of
lubricant
to
damping
compound
Shut-off
mechanism
has
shifted
out
of
position
during
shipping
Moving
the
start
switch
(33)
causes
change
lever
(209)
to
rotate
outwards.
This
ini-—
tiates
the
following
functions:
a)
A
lug
rotates
shift
arm
(180).
The
lat-
ter
in
turn
by
means
of
a
tension
spring
moves
the
change
lever
(130)
and
thus
the
idler
wheel
(152)
into
engagement
with
motor
pulley
(137/139)
and
platter
ye
At
the
same
time
the
power
switch
167)
is
actuated
by
the
switch
slide
(177)
coupled
to
the
shift
arm
and the
platter
starts
to
rotate.
b)
Change
lever
(209)
is
brought
within
reach
of
the
cam
follower
lever
(195)
so
that
the
latter
is
pushed
into
the
chan-
g&@
position
after
subsequent
rotation
of
the
main
cam.
.
Remedy
a)
Carry
out
necessary
adjustment
by
means
of
right-hand
selector
lever
(33).
b)
Set
right-hand
selector
lever
to
"45".
-
With
a
screwdriver
inserted
through
the
hole
exposed
turn
eccentric
pin
until
the
tonearm
sets
down
approximately
1.5
mm
from
the
edge
of
the
record.
(Ad-
justment
is
only
carried
out
for
7"
re-
cords
and
is
then
automatically
correct
for
12"
records.)
c)
Use
standard
record
d)
Clean
clutch
surfaces
Adjust
arm
height
with
adjuster
sleeve
(38).
Height
is
correct
when
stylus
tip
is
2
=
3
mm
above
selector
lever
(33)
when
arm
is
remo-
ved
from
rest.
Remove
tonearm
complete
with
bearing
assem-
bly
(described
on
page
6).
Remove
lock
was-
her
(37),
detach
adjuster
sleeve
and
remove
second
lock
washer
137).
Remove
lock
washer
(253)
on
adjuster
lever
(214).
Detach
posi-
tioning
slide
from
pin
on
adjuster
lever,
turn
slightly
until
lift
pin
(249)
is
relea-
sed.
Remove
lift
pin.
Clean
lift
tube
and
lift
pin.
Smear
lift
pin
evenly
with
"Wacker
Silicone
oil
AK
500
OOO".
Smear
lift
pin
evenly
with
"Wacker
silicone
oil
AK
500
O00".
Reassemble
components,
Remove
tonearm
complete
with
bearing
assembly
(described
on
page
6).
Remove
lock
washer
(37),
detach
adjuster
sleever
and
remove
se-
cond lock
washer
(37).
Remove
lock
washer
(253)
on
adjuster
lever
(214).
Detach
posi-
tioning
slide
from
pin
on
adjuster
lever,
turn
slightly
until
lift
pin
(249)
is
rele-
ased.
Remove
lift
pin.
Clean
lift
tube
and
lift
pin.
Smear
lift
pin
evenly
with
"Wacker
Silicone
oil
AK
500
O00".
Reassemble
com-
ponents.
Before
using
changer
after
moving,
run
it
through
start
cycle
with
tonearm
locked
on
rest
(selector
moved
to
"start")
|
225
223
193
212
180
209
183
214
157
|
i
193
180
212
209
183
214 157
Fig.
15
Muting
Switch
Cam
wheel
at
zero:
Contacts
of
muting
switch
opened
Cam
wheel
is
turning:
Contacts
of
muting
switch
is
closed
10
Moving
the
operating
switch
(33)
also
re-
leases
the
start
level
(208)
which
is
pul-
led
towards
the
main
cam
by
means
of
ten-
sion
spring
(207).
By
this
means
the
shut-
off
lever
7190)
is
moved
within
the
range
of
the
dog
on
the
platter
pinion
thus
dri-
ving
the
main
cam.
The
change
lever
(209)
is
also
locked.
To
prevent
malfunctions
the
operating
switch
is
locked
in
position
du-
ring
the
start
cycle
(rotation
of
the
main
aay
Just
before
the
main
cam
Teaches
neu-
tral
position
(at
the end
of
the
change
cy-
cle)
the
start
lever
is
pushed
clear
by
the
main
cam
and
thus
the
operating
switch
and
change
lever
are
returned
to
their
original
positions.
After
installation
and
after
mo-
ving
the
changer
the
unit
should
be
started
with
the
tonearm
locked
on
the
rest.
This
will
automatically
readjust
the
shut-off
lever
which
may
have
shifted
out
of
posi-
Lions
Manual
Start
When
the
tonearm
is
swung
inwards
by
hand
the
pawl
(202)
on
the
shift
arm
(180)
en-
Gages
on
a
square
end
pin
fitted
in
the
chassis,
retaining
the
shift
arm
in
this
position
and
thus
the
idler
wheel
(152)
in
engagement
with
the
platter.
The
slide
(177)
linked
to
the
shift
arm
actuates
the
power
switch
and
sets
the
plat-—
ter
in
motion.
On
reaching
the
run-out
groove
the
tonearm
automatically
returns
to
its
rest
position
and
the
unit
shuts
itself
off.
If,
however,
the
tonearm
is
lifted
off
the
record
before
completion
of
play
and
returned
to
the
rest,
the
pin
of
segment
(245)
releases
the
paul
(202).
The
tension
spring
then
returns
the
shift
arm
to
its
initial
position,
opening
the
power
switch
and
disengaging
the
idler
wheel.
Stop
Switching
When
the
operating
lever
is
moved
to
"stop"
only
the
starting
lever
(208)
is
drawn
for-
ward.
As
a
result,
the
shut-off
linkage
en-
gages
with
the
main
cam.
The
cam
follower
lever
remains
in
stop
position.
When
the
tonearm
is
on
its
rest
and the
operating
le-
ver
is
pushed
to
"stop",
the
change
lever
must
not
jam.