Dual 1224 Manuel utilisateur

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1

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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.