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Dual

Edition

February

1978

60

1

1

Service

-

Manual

Dual

Gebrüder

Steidinger

•

7742

St.

Georgen/Schwarzwald

Download from www.dual.de

Not for commerical use

Contents

Page

2

3/4

5

6

6

6

7

7

7

7

8

8

8

8

9

9

9

9

10

10

10

10

11

11

11

11

11

11

11

11

—

17

18

Technical

data

Current

Line

voltage

Drive

Power

input

Power

consumption

Time

from

start

to

rated

speed

Platter

Platter

speeds

Pitch

control

Speed

control

(monitoring)

Technical

data

Wiring

diagram

Audio

connection

diagram

Dual

EDS

500

electronic

direct

drive

system

Replacement

of

motor

electronics

Replacement

of

motor

mechanic

Adjustment

of

nominal

speeds

Setting

78

rpm

nominal

speed

Stroboscope

Pitch

control

Tonearm

and

tonearm

suspension

Removal

of

tonearm

from

bearing

frame

Removal

of

tonearm

compl.

with

tonearm

suspension

Removal

of

spring

housing

Adjustment

of

tonearm

suspension

Antiscating

control

Cue

control

Replacement

of

cue

control

assembly

Tonearm

control

Adjustment

point

Muting

switch

Starting

and

shut-off

Adjustment

points:

Segment/power

switch

Pick

-up

head

not

parallel

Stylus

slips

out

of

playing

groove

Tonearm

does

not

set

down

or

lowers

onto

record

too

quickly

after

Tonearm

moves

at

zero

position

of

dials

Motor

does

not

shutt-off

when

setting

down

on

tonearm

rest

Acoustic

feedback

Replacement

with

exploded

views

Lubrication

Sensitivity

of

the

illuminated

strobe

(for

0.1

%

speed

deviation)

Total

wow

and

flutter

Rumble

laccording

to

DIN

45

5001

Tonearm

Effective

length

of

tonearm

Offset

angle

Tangential

tracking

error

Tonearm

bearing

friction

Stylus

pressure

Weight

AC

50

to

60

Hz

110

to

125V,

220

to

240V

electronically-regulated

direct-drive

system,

Dual

EDS

500

approximately

2

watts,

Motor

at

playing

Operation

<

50

mW

220

V

50

Hz:

at

start

25

mA

110

V

60

Hz:

at

play

15

mA

at

start

65

mA

at

play

approximately

25

mA

2

—

2.5

s

at

33

1/3

rpm

non-magnetic,

dynamically

balanced,

detachable

1

3

kg,

300

mm

diameter

33

1/3

and

45

rpm,

electronically

adjustable

Separate

for

both

speeds,

each

adjustable

by

means

of

variable

resistor,

with

calibration

scale;

range

of

regulation:

10%

with

illuminated

stroboscope

for

platter

speeds

33

1/3

and

45

rpm,

adjustable

to

50

or

60

Hz.

6

division

markings

per

minute

at

50

Hz,

7.2

division

markings

per

minute

at

60

Hz.

according

to

DIN

45

507

(German

Industry

Standard)

<

±

0.06

%

Unweighted:

>

45

dB

Weighted:

>

65

dB

Torsional

ly

rigid

tubular

aluminum

tonearm

in

low-friction

four-point

gimbal

suspension,

tonearm

counterbalance

with

two

mechanical

anti-resonance

filters.

222

mm

25

0

20'

0.16

0

/cm

vertical

<

0.07

mN

10.007

g)

horizontal

<

0.16

mN

)0.016g)

from

0

to

30

mN

10

to

3

g)

infinitely

variable

with

1

mN-

11/10

g)

calibrations

from

0

to

15

mN

10

to

1.5

g),

operable

from

2.5

mN

10.25

g)

stylus

pressure

up.

4.6

kg

Dimensions

and

Cutout

Required

refer

to

Installation

Instructions.

(related

to

stylus

tip)

2

D

1

(

-

1

—

ZPD

7,5

cl

47

p

2

•

66

2/3

Hz

(33

minl)

C

2

220

p

R2

10

k

C4

0,47

p

+

R

1

1

M

C

0,47

/I

Ti

R5

1

M

1—*

G

1

BC

172

R3

68

k

n

33

—t•

4

•

G2

R6

R4

22

k

82

k

C

5

—

10

n

C6

in

G3

—C

7

n

G4

R8

—

A

9

—10

k

22k

R7

47

k

R

10

24

k

T2

BC

172

B

—C8

0,22

p

Transistoren

von

der

Anschlußseite

gesehen

Transistors

as

seen

from

the

connecting

side

Transistors

vus

du

cöte

des

connexions

• •

e

BC

172

BC

238

C

IC

von

der

Bestückungsseite

gesehen

as

seen

from

the

top

side

vu

du

cöte

el6ments

555

EBC

4069

BD

415

1

4

2

3

1

2

3

R

16

8.2

•

7

15

2

8

4

6

IC

2

—

555

—

3

3

7

1

5

R

11

110k

6

R

19

2,5k

1

2

•

G5

G6

14

in

_C9

—

20

n

560

R

13

15

k

D2

1

N

4148

V

R

15

C

10

—

0,47

p

10

k

R

14

220

k

C

13

47

p

12

—

0,68

p

8.1

7

•

T3

BC

238

C

MIM

1.3

R

12

270

k

10/130

V-

20/240

V-

10

n

=-

12

C

11

+

10

p

R

18

2

R

17

47

k

Si

63

mAT

C

52-

47

n

220

V

C

51

—

68

n

A

D

51

/

By

183

R

51

22

k

19

13

16

14

15

52

51

17

1

70

5

,

3

,

18

10

13

T4

BD

415

20,5

V

C

55

1000

p

T54

0

n

14

9

52

11

51

4

12

53

54

Fig.

2

TA-Anschlußschema

/

Audio

Connection

Diagram

/

Schema

de

branchement

/

Esquema

de

conexion

del

fono

captor

L

a)

mit

DIN-Stecker

5-polig

/

with

DIN-plug

5

pin

b)

mit

Cynchstecker

/

with

phono

plug

avec

ficrie

DIN

5

pöles

/

con

enchufe

DIN

de

5

poles

rechter

Kanal

right

channel

canal

droit

canal

derecho

rot

/

red

/

rouge

/

rojo

linker

Kanal

left

channel

canal

gauche

canal

izquierdo

weiß

/

white

/

blanc

/

blanc

rechter

Kanal

right

channel

canal

droit

canal

derecho

rot

/

red

/

rouge

/

rojo

[1

ni

,

Masse

rechter

Kanal

Mass

right

channel

1

Masse

canal

droit

1

masa

canal

derecho

grün

/

green

/

vert

/

verdc

1

1 1

L

J

!

I

i

1

I

1

I

I

1

1

I

loi

1

I

1

1

\

Tonabnehmerkabel

Tonearm

audio

cable

Cäble

de

BF

Cable

del

fonocaptor

avec

fiche

cynch

/

con

enchufe

Cynch

rechter

Kanal

/

right

channel-

1

-

Canal

droit

/

Canal

derecho

rot

(schwarz)

/

red

(black)

rouge

(noir)

/

rojo

(negro)

Masse

draht

/

Mass

lead

Mass

cable

/

Mass

cable

_

1

-

1

linker

Kanal

left

channel

1

canal

gauche

canal

izquierdo

-I-weiß

/

white

/

blanc

/

blanco

1

Masse

linker

Kanal

1

Mass

left

channel

1

Masse

canal

gauche

1

masa

canal

izquierdo

j

blau

/

blue

/

bleu

/

azul

-

z

1

i i

•.

1

'1

1

—

1

Masse

rechter

Kanal

-

1

Mass

right

channel

1

Masse

canal

droit

masa

canal

derecho

I

/ / /

II

I

I

I

1

Masse

schwarz

Mass

black

Masse

noir

Masa

negro

7

Masseblech

Mass

sheet

Prise

de

masse

chapa

de

masa

Kontaktplatte

Contact

plate

Plaque

de

contacts

Placa

de

contacto

I

-r

-linker

Kanal

/

left

channel

I

1

Canal

droit

/

Canal

izquierdo

I

1

gelb

(weiß)

/

yellow

(white)

jaune

(blanc)

/

amarillo

(blanco)

I I

fl

I

1

1

I

- -

--

1 1

Cynch-Tonabnehmerkabel

I

1

Pick

-up

lead

with

Cynch

plug

Cäble

de

BF

avec

fiche

Cynch

Cable

del

fonocaptor

con

I

enchufe

Cynch

I

---

Masse

linker

Kanal

Mass

left

channel

Masse

canal

gauche

1 1

masa

canal

izquierdo

I

7-•

II

1

15

I

-

I

L

/ /

7

7

L

,

[1

1

Kurzschließer

1

Muting

switch

1

Court-circuiteur

i

1

Dispositivo

cortocircuitador

I

II

I

I

Tonarm

kopf

Tonearm

head

Tate

magnätique

Cabezal

fonocaptor

5

Fig.

3

Direct

Drive

System

Dual

EDS

500

Fig.

4

Dr.ahlechalter

Platter

speed

welch

Demreutatem

de

ritere

Netateil

l '

eT

4

Fig.

5

Netzteil

Supply

unit

Bloc

secteur

Generator

Generateur

For

repair

of

the

Dual

EDS

500

special

tools

and

measuring

means

are

required.

Work

on

the

motor

or

motor

electronics

system

should,

therefore,

only

be

carried

out

by

an

authorized

Dual

service

station.

Removal

1.

Extract

unit

plug

from

power

line.

Lift

off

platter

(4).

Bring

unit

into

head

position.

2.

Remove

machine

screws

(112)

and

cover

of

power

part

(113).

3.

Unsolder

connecting

leads

to

motor

and

generator.

Open

twists

of

holding

angle

(150)

with

pliers.

Remove

motor

electronics

(152),

screws

(151)

and

holding

angle

(150).

4.

Pull

off

motor

electronics

(152)

system

from

motor

(18)

care-

fully.

5.

Fix

replacement

motor

electronics.

Solder

connecting

cables

(see

connection

diagram

Fig.

4).

6.

Slide

cover

over

power

part

and

fix

it

by

means

of

machine

screws

(112).

7.

With

the

unit

in

normal

position

connect

it

to

power

line.

Switch

on

unit

and

check

power

consumption

on

Opera-

tion:

220

V/50

Hz

approx.

15

mA

110

V/60

Hz

approx.

25

mA

Check

nominal

speeds.

If

necessary,

readjust

as

described

below.

Replacement

of

Motor

Mechanics

1.

Extract

unit

plug

from

power

line.

Remove

platter

(4).

2.

With

the

unit

in

head

position

remove

machine

Screws

(174)

and

washers

(173).

Pull

off

motor

electronics

board

(172)

together

with

cover

(175)

carefully

from

the

motor

(18).

Drehzahlregler

/

R

19

Platter

speed

switch

/

R

19

Commutateur

de

vitesse

/

R

19

R1

r i

1.2

3.1

Cl

)

1.3

•-ig2-4,

-

Motor

Moteur

8.2

Pol*

el

R6

1

-•

3

Ti

T

C13

-,-

6-1 R13

I-•

jC11

4

e

_p_±.

)2

7 8

T2

•

•

02

IP-

WM

f

12

2IC2

e

C7 C8

1.

_

)

11

T

-A.C5

•_ii_.

-

1

-- cloib

li

p:.

-T

1

*-1

R15

1-•

T3

6

3.

Loosen

connection

for

operating

voltage

at

het

plate

(109).

Unsolder

connecting

leads

to

speed

fine

adjustment

(129),

rotary

switch

(5)

and

the

generator.

Open

twists

of

holding

angle

(152)

with

pliers.

4.

Loosen

threaded

pins

(36)

and

remove

platter

cone

(35).

Remove

the

three

screws

(148).

Lift

off

motor

mechanics

(149).

5.

Put

platter

cone

(35)

on

new

motor

mechanics

and

fix

it.

Fix

new

motor

mechanics

with

the

three

screws

(148).

Fix

holding

angle

(150)

with

screws

(151).

Insert

motor

electronics

(152)

and

twist

holding

pieces.

Solder

on

resp.

plug

connecting

leads

(Fig.

4).

Push

cover

on

power

part

and

fix

lt

with

screws

(112).

6.

With

the

unit

in

normal

position

connect

lt

to

the

power

line

Switch

on

unit

and

check

power

consumption

when

opera-

ting:

220

V/50

Hz

approx.

15

mA

110

V/60

Hz

approx.

25

mA

Check

nominal

speeds.

If

necessary,

readjust

as

described

below.

Setting

nominal

speeds

With

knob

(7)

bring

the

fine

speed

control

(129/R

19)

into

center

position.

With

controls

(R

8)

and

(R

9)

on

the

motor

elec-

tronic

System

adjust

nominal

speeds.

Control

IR

8)

is

used

for

33

1/3

rpm,

R

9

for

45

rpm.

Check

with

strobe

disk.

Changeover

to

78

rpm

nominal

speed

I

nstead

of

45

rpm

the

Dual

604

can

be

changed

to

a

nominal

speed

of

78

rpm.

To

change

the

speed

bring

the

fine

speed

control

1129/R

19)

in

center

position

using

knob

(7).

Using

control

R

9

on

the

motor

electronics

board

(172)

adjust

for

78

rpm.

Check

with

strobe

disk.

Stroboscope

Accurate

setting

of

the

platter

speeds

33

1/3

and

45

rpm

can

be

checked

during

play

with

the

aid

of

the

stroboscope.

When

the

platter

(4)

is

rotating

at

exactly

33

1/3

or

45

rpm

the

lines

of

the

stroboscope

appear

to

stand

still.

If

the

lines

move

in

the

direction

of

rotation

of

the

platter,

the

platter

speed

is

too

high.

If

the

lines

move

backwards,

the

platter

is

rotating

more

slowly

than

the

nominal

speed.

Adjustment

of

platter

speeds

33

1/3

and

45

rpm

is

carried

out

separately

with

the

"pitch"

controls

(7).

Strobe

markings

are

provided

on

the

outer

edge

of

the

platter

for

50

and

60

Hz

line

frequencies.

To

replace

glow

lamp

(157)

remove

machine

screws

(160)

and

remove

strobe

cover

(156).

lt

can

happen

that

the

stroboscope

lines

appear

to

move

slightly

although

the

exact

speed

setting

with

stroboscope

stationary

has

not

been

altered.

This

apparent

contradiction

is

explained

by

the

fact

that

the

electronic

central

drive

motor

operates

fully

inde-

pendently

of

line

frequency

whilst

the

only

relatively

accurate

line

frequency

of

the

AC

current

supply

is

used

for

speed

measurement

with

the

light

stroboscope.

The

constantly

detec-

table

fluctuations

of

line

frequency

by

±

2

%

according

to

the

Information

of

the

electricity

supply

companies

brief

frequency

fluctuations

up

to

1

%

are

possible

—

only

effect

the

stroboscope

indication

and

can

c,ause

the

lines

to

"wander"

although

the

platter

speed

is

as

constant

and

absolutely

accurate

as

before.

Pitch

Control

Each

of

the

two

standard

speeds

33

1/3

and

45

rpm

178

rpm)

can

be

varied

by

about

10

%.

The

variable

speed

control

1129/

R

19)

located

in

the

voltage

divider

is

adjusted

by

turning

the

pitch

control

knob

(7).

By

this

the

differential

amplifier

is

altered

and

the

motor

speed

accordingly.

Fig.

6

153

144

156

157

159

160

Fig.

7

Netztrafo

Mains

transformer

Transformateur

de

rgiseau

C55

L537,

C52

.

I—•-•

e

R52

C51

.1

51

--

*

Z

-K-•

R

51

.4=-4

fI

E3,4›

ee

63

mA

mT

0

223/

10V

Motor

Motor

Moteur

Glimmlampe

Glim

lamp

Lampe

ä

effluves

7

194

68

42

60

202

Fig.

8

71

17

19

11

11

3

1

mmmmmmmmmmm

11111111

.uu.7 Iu.II" Piwassiouseinewe

e

i '

u1111111i

p.

›..

• •

••

• • • • • •

bl

'Luv

it_g_KAA

I i m

'L!''. ir

I

3

ZZZZZZZZZZ

II

i

r.

•

197

168

Tonearm

and

Tonearm

Suspension

The

feather-light,

extremely

torsion

resistant

all-metal

tonearm

is

suspended

in

a

gimbal.

Suspension

is

by

means

of

4

hardened

and

precision

polished

steel

points

which

rest

in

precision

ball

bearings.

Tonearm

bearing

friction

is

thus

reduced

to

a

minimum.

Bearing

friction

vertical

0.07

mN

(0.007

p)

Bearing

friction

horizontal

0.16

mN

(0.016

p)

as

related

to

stylus

point.

As

a

result,

it

ensures

most

favourable

pick

-up

conditions.

Before

adjusting

the

tracking

force

to

suit

the

built-in

pick

-up

cartridge

the

tonearm

is

balanced

with

the

scale

set

to

zero.

Coarse

adjust-

ment

is

carried

out

by

moving

the

weight

with

the

stem

(49),

the

subsequent

fine

adjustment

by

turning

the

weight.

The

balance

weight

is

designed

such

that

pick

-up

cartridges

having

a

dead-

weight

of

4.5

-

10

g

can

be

balanced.

The

tracking

force

is

adjusted

by

turning

the

graduated

spring

housing

(60)

incorporating

a

coil

spring.

The

scale

has

markings

for

a

range

of

adjustment

from

0

to

30

mN

(0

to

3

p)

which

per

-

mit

accurate

adjustment

of

the

tracking

force.

One

graduation

in

the

range

of

2

-

15

mN

(0.2

-

1.5

p)

corresponds

to

1

mN

(0.1

p),

in

the

range

of

15

-

30

mN

(1.5

-

3

p)

to

2.5

mN

(0.25

p).

Fig.

9

208

211

207

206

43

185

34

57

49

219

205

206

203

2

2

11

207

Removing

the

tonearm

froM

the

bearing

frame

We

recommend

the

following

procedure:

1.

Clamp

unit

in

the

repair

stand.

Set

spring

housing

scale

(60)

to

zero.

Lock

tonearm

(48).

Remove

weight

(49).

2.

Turn

unit

over

and

remove

the

screening

sheet

(140).

Un-

solder

the

tonearm

connections

on

the

muting

switch

(137).

3.

Remove

safety

washer

(187),

washer

(186)

and

bearing

(185).

Move

positioning

bar

(219)

towards

muting

switch

(137).

4.

Unlock

tension

spring

(208),

loosen

safety

washer

(215)

and

remove

skating

lever

(214).

5.

Remove

safety

washer

(212)

and

sliding

washer

(210)

and

take

shut-off

bar

(161)

from

segment.

6.

Remove

hex

nuts

(210)

and

segment

(207).

7.

Hold

tonearm

(48).

Remove

hex

nut

(203)

and

tonearm

cpl.

with

tonearm

bearing.

Reverse

this

procedure

when

reassembling.

Removal

of

tonearm

assembly

with

tonearm

bearing

1.

Secure

unit

in

repair

jig.

Remove

weight

(49)

and

undo

fixing

screw

(52).

Set

tracking

force

scale

(60)

to

zero.

2.

Move

unit

into

head

position.

Remove

screening

plate

(140).

Unsolder

tonearm

connecting

on

muting

switch

(137).

3.

Move

unit

into

normal

position.

Remove

both

mounting

screws

-

SW

4.5

(54).

For

installation

proceed

in

the

reverse

order.

Replacing

spring

housing

Remove

tonearm

(48)

from

bearing

frame

(51)

as

described

above.

Loosen

lock

nut

(55)

and

threaded

pin

(56).

Unscrew

bearing

screw

(61).

Lift

bearing

frame

(59).

Remove

spring

hou-

sing

(60).

When

installing

rote

that

the

helical

spring

catches

the

bearing

frame.

Slide

in

washer

(60)

and

tighten

bearing

screw

(61).

Reinstall

tonearm

(48).

Set

bearing

play

as

described

below

using

threaded

pin

(56)

and

lock

nut

(55).

8

Adjusting

the

tonearm

bearing

First

balance

tonearm

exactly.

Both

bearings

must

have

slight,

just

perceptible

play.

The

horizontal

tonearm

bearing

is

correctly

adjusted

when

at

anti-skating

settings

"0.5"

and

being

touched

lt

slides

in

without

resistance.

The

vertical

tonearm

bearing

is

correctly

adjusted

when

lt

swings

in

after

being

touched.

The

play

of

the

horizontal

tonearm

bearing

should

be

adjusted

with

threaded

pin

133)

and

mat

of

the

vertical

tonearm

bearing

with

threaded

pin

(56).

Anti-skating

Device

To

compensate

for

skating

force

use

the

knurled

ring

(66).

The

asymmetric

cam

plate

(217)

displaces

the

skating

lever

(214)

from

the

tonearm

pivoting

point.

The

anti-skating

force

is

trans-

mitted

to

the

segment

1207)

and

to

the

tonearm

(48)

by

tension

spring

1209).

Optimum

adjustment

is

carried

out

at

the

works

for

styli

having

a

tip

radius

of

15

pm

(conical),

5/6

and

18/22

I../m

lellipticall,

and

CD

4-cartridges.

Any

alteration

can

only

be

carried

out

with

the

aid

of

a

Dual

-

Skate

-0

-Meter

and

a

test

record

and

should

only

be

done

by

an

authorized

service

station.

Recheck

as

follows:

Balance

tonearm

(48)

correctly.

Set

knurled

ring

(661

to

0.

The

tonearm

should

remain

at

any

desired

point

within

its

turning

range.

The

hole

of

the

skating

lever

(214)

should

be

in

alignment

with

the

center

line

of

the

tonearm.

Adjustment

is

made

by

the

eccentric

pulley

(E)

which

is

accessible

through

the

hole

in

the

installation

plate

(231

between

the

knurled

ring

(68)

and

the

tonearm.

Then

set

knurled

ring

(66)

to

"0.5".

The

tonearm

should

now

smoothly

rotate

from

the

platter

center

to

its

rest

(71).

Cue

Control

By

moving

the

lever

1194)

forward

I

•1

lift

cam

(197)

rotates.

The

slide

bar

(219)

connected

to

lt

transmits

this

movement

to

the

lift

pin

(206)

(via

the

compensating

cam

which

then

raises

the

tonearm.

As

a

result,

the

cue

control

permits

setdown

of

the

tonearm

at

any

desired

point.

The

lever

(194)

is

released

by

moving

the

cue

control

lever

rear-

wards

(I).

As

a

result

of

the

action

of

compression

spring

12041

the

lift

pin

(201)

is

brought

back

to

its

normal

position

and

the

tonearm

lowered

slowly.

Lowering

of

the

tonearm

is

damped

by

silicone

oil

in

the

lift

tube.

Adjustment

Point

The

lift

height

may

be

varied

by

turning

the

sleeve

(202).

The

distance

between

the

record

and

the

needle

is

to

be

5

-

7

mm

with

the

tonearm

1481

having

a

height

play

of

1

-

2

mm

Make

adjustment

by

means

of

set

screw

(571.

Replacement

of

Cue

Control

Plate

Replace

cue

control

plate

(201)

es

follows:

1.

Clamp

unit

in

the

repair

stand

and

lock

tonearm.

Turn

unit

over.

2.

Remove

safety

washer

(187),

washer

(186)

and

bearing

(185).

Lift

positioning

bar

(219)

and

move

towards

muting

switch

(137).

3.

Unlock

tension

spring

(208).

Loosen

safety

washer

(215)

and

lift

skating

lever

(214).

Remove

safety

washer

(213)

and

sli-

ding

bar

(212).

Lift

shut-off

bar

(161)

from

segment

(207).

4.

Remove

hex

nuts

(211)

and

segment

(207).

Fig.

10

Fig.

11

Fig.

12

9

5.

Remove

machine

screws

(205).

Hold

tonearm

bearing.

Linscrew

hex

nut

(203)

and

remove

lift

plate

(201).

6.

Secure

tonearm

with

hex

nut

(203)

against

falling

out.

Reverse

this

procedure

when

reassembling.

Tonearm

set-down

mechanism

When

turning

knob

(68)

to

"V"

position

the

recesses

of

slide

bar

(219)

are

positioned

in

the

area

of

the

spring

pin

(F)

of

seg-

ment

12071.

When

moving

slowly

the

tonearm

with

tonearm

cue

control

in

V

position

the

spring

pin

(F)

is

arrested

in

the

recesses

of

slide

bar

(217)

thus

designing

the

set-down

point

of

stylus

for

30

cm

and

17

cm

records.

To

enable

set-down

in

the

catching

range

of

the

arresting

point

of

the

appropriate

setdown

position,

the

tonearm

set-down

me-

chanism

can

be

disengaged

with

the

knob

(68)

in

"—"

position.

Adjustment

Points

a)

Balance

tonearm

(48)

exactly.

Bring

knob

(68)

into

position.

Let

tonearm

catch

in

catch

point

for

tonearm

set-

down

point.

Check

catch

force

by

means

of

a

spring

balance.

lt

should

read

10

—

20

p.

The

force

is

adjustable

by

means

of

a

threaded

pin.

b)

The

tonearm

set-down

point

can

be

adjusted

by

turning

set

screw

(42).

Adjustment

can

be

made

for

17

-cm-

and

30

-cm

records.

Short

Circuiter

To

prevent

disturbing

noises

during

automatic

operation

of

the

tonearm

the

unit

is

fitted

with

a

short

circuiter.

Control

of

the

switch

springs

for

both

channels

is

effected

by

the

camwheel.

With

the

unit

in

neutral

state

the

short

circuit

of

the

pick

-up

leads

is

eliminated.

Adjustment

In

zero

position

of

the

cam

there

should

be

a

clearance

of

ap-

proximately

0.5

mm

between

the

contacts

of

the

short

circuiter.

This

clearance

should

be

adjusted

by

bending

the

short

circuit

contact.

The

contacts

should

be

sprayed

with

a

suitable

cleaning

agent.

Starting

and

shut

off

Swing

ing

in

the

tonearm

(48)

rotates

the

segment

(207)

thus

actua-

ting

the

power

switch

(116)

and

shift

arm

(146)

and

starting

motor

11491

and

platter

(4)

rotating.

The

shut-off

cycle

after

playing

a

record

is

initated

by

the

dog

(M)

of

the

platter

141

and

shut-off

lever

(A).

The

shut-off

lever

(A)

is

guided

onto

the

dog

by

the

movement

of

the

tonearm

when

playing

the

record

with

the

aid

of

the

shut-

off

bar

(161)

proportionate

to

the

groove

lead

(Fig.

13

a).

The

eccentrically-mounted

dog

forces

the

shut-off

lever

(A)

back

w,ith

each

revolution

as

long

as

the

advance

of

the

tonearm

only

amounts

to

the

width

of

one

groove.

The

cam

wheel

(37)

is

thus

guided

to

the

pinion

range

of

the

platter.

The

tonearm

is

lifted

and

the

resetting

bar

(188)

trans-

ports

it

back

to

the

rest.

The

power

switch

is

operated,

thus

switch

ing

the

unit

off.

Fig.

13

207

Fig.

14

Fig.

15

219

0,2

mm

A

37

161

a.)

b.)

10