Dual 521 User manual

Table of contents

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L

L._

•••••

Dual

Edition

August

1978

Service

Manual

521

Dual

Gebrüder

Steidinger

7742

St.Georgen/Schwarzwald

Download from www.dual.de

Not for commerical use

Fig.

1

TA-Anschlußschema

/

Audio

Connection

Diagram

/

Schema

de

branchement

/

Esquema

de

conexion

del

fono

captor

a)

mit

DIN-Stecker

5-polig

/

with

DIN-plug

5

pin

avec

fiche

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

dauche

canal

izquierdo

weiß

/

white

/

blanc

/

blanc

Tonabnehmerkabel

Tonearm

audio

cable

".•

Cäble

de

BF

Cable

del

fonocaptor

b)

mit

Cynchstecker

/

with

phono

plug

avec

fiche

cynch

/

con

enchufe

Cynch

rechter

Kanal

/

right

channel—I—

Canal

droit

/

Canal

derecho

!

rot

(schwarz)

/

red

(black)

rouge

(noir)

/

rojo

(negro)

\

1

Masse

rechter

Kanal

-

1

Mass

right

channel

1

Masse

canal

droit

1

masa

canal

derecho

Masse

draht

/

Mass

lead

Mass

cable

/

Mass

cable

rechter

Kanal

right

channel

canal

droit

r

1

canal

derecho

rot

/

red

/

rouge

/

rojo

t

1

Masse

rechter

Kanal

I

Mass

right

channel

i

Masse

canal

droit

masa

canal

derecho

grün

/

green

/

vert

/

verdc

I

I

r

1

I

rl

I

1

I

1

I

11

1

1

I

1

1

-

1

linker

Kanal

—

____J

1

left

channel

1

canal

gauche

1

canal

izquierdo

+weiß

/

white

/

blanc

/

blanco

1

I

Masse

linker

Kanal

1

Mass

left

channel

1

Masse

canal

gauche

masa

canal

izquierdo

1

blau

/

blue

/

bleu

/

azul

L

J

//

7

/ /

J

//

I

II

II

Masse

schwarz

Mass

black

Masse

noir

Masa

negro

Masseblech

Mass

sheet

Prise

de

masse

chapa

de

masa

Kontaktplatte

Contact

plata

Plaque

de

contacts

Placa

de

contacto

1

I

i

i

--linker

Kanal

/

left

channel

I I

1

Canal

droit

/

Canal

izquierdo

1

i

gelb

(weiß)

/

yellow

(white)

I

jaune

(blanc)

/

amarillo

(blanco)

I

I

I

1

T

-1

i

1

IN

1 s

i

1

Cynch-Tonabnehmerkabel

I

I

1 1

Pick

-up

lead

with

Cynch

plug

I

!

:

Cäble

de

BF

avec

fiche

Cynch

I I I

Cable

del

fonocaptor

con

I I

1

I

enchufe

Cynch

I

I I

1

1 1 1

1 1

I

i

1

1

1

--

Masse

linker

Kanal

I

1

11 1

Mass

left

channel

1 1 1

Masse

canal

gauche

I I I

masa

canal

izauierdo

I

1

1

I

I

1

1 1

1

I I

1

1 1

i

I

lj

1

r -

r

e

\

i

L_

1

r

I

I

I

I

I

L

1

1

I

I

I

1 1

I

1

I

J

1_,

/Z 7/

II

III

Kurzschließer

Muting

switch

Court-circuiteur

Dispositivo

cortocircuitador

U

77)77

7—Tonarmkopf

Tonearm

head

Täte

magnätique

Cabezal

fonocaptor

2

Table

of

Contents

Page

3

Specif

ication

4

Motor

and

drive

4

Speed

selection

4

Turntable

4

Belt

4

To

replace

the

motor

pulley

5

Stroboscope

5

Tuning

to

the

pitch-of-tone

level

6

To

replace

the

spring

case

6

To

adjust

the

tone

arm

bearings

6

Tone

arm

with

bearings

6

To

remove

the

tone

arm

from

its

bearing

frame

6

To

remove

tone

arm

complete

with

bearings

6

Anti-skating

device

7

Tone

arm

lift

7

To

replace

the

lift

plate

7

Tone

arm

control

8

The

starting

sequence

8

Manual

start

8

Continuous

play

8

Muting

switch

8

Final

shutting-off

9

Stop

circuit

9

Adjustments

9

Tone

arm

set-down

point

9

Set

-down

point

for

30

-cm

records

9

Set

-down

point

for

17

-cm

records

9

Shut-off

point

9

Tone

arm

l

ift

height

9

Troubleshooting

9

Turntable

does

not

start

9

Turntable

speed

unsatisfactory

10

Tone

arm

improperly

lowered

10

Acoustic

feedback

10

Rated

speed

borders

pitch

adjustment

range

10

List

of

spare

parts

(

I

nstructions)

12

Explosivie

views

14

Lubrication

Specification

Mains

frequency

50

or

60

Hz;

use

associated

motor

pulley

Maind

voltage

110

—

130

V

or

220

—

240

V,

pluggable

Drive

motor

Dual

model,

8

-pole,

synchronous

Drive

by

motor

pulley-to-turntable

belt

Power

consumption

10

watts

approx.

Current

drain

75

mA

at

220

volts,

50

Hz;

140

mA

at

117

V

60

Hz

Turntable

non-magnetic,

dia.

304

mm,

vveight

1.2

kg

Record

speeds

33

1/3

and

45

revolutions

per

minute

(rpm)

Tone

arm

lift

automatic,

coupled

to

speed

selection

Pitch

of

tone

adj.

range

about

1

semitone

(6

%)

,

both

speeds

Wow

and

flutter

less

than

±

0.1

%

by

test

standard

Signal/noise

ratio

instrinsic

min.

60

dB,

external

min.

40

dB

Tone

arm

tubular

anti-torsion

metal

tube

Tone

arm

bearings

universal

four-point

gimbal

suspension

TA

brg.

friction

vertical

less

than

0.10

mN

ref.

to

stylus

point

horizontal

less

than

0.40

mN

ref.

to

stylus

point

Tracking

force

continuously

adjustable

in

the

range

0—

50

mN

(0—

5

gr);

reliable

operation

with

5

mN

(0,5

gr)

and

higher

Pickup

head

detachable,

accpets

all

Dual

snap-in

cartridges

and

all

other

1/2"

systems

weighing

between

4.5

gr

and

10

gr,

mounting

material

included

Weight

4.1

kg

For

dimensions

and

bench

cutout,

refer

to

Installation

I

nstructions.

Fig.

2

Fig.

3

Fig.

4

NOTE:

The

item

numbers

mentioned

in

the

text

refer

to

the

illu-

strations,

exploded

views

(page

12)

and

Parts

List.

Motor

and

Drive

Tu

rntable

and

mechanism

are

driven

by

the

motor

(132)

(see

Fig.

21).

This

shaded-pole

motor

runs

vibration-free

in

radially

elastic

mounts

and

has

extremely

low

magnetic

leakage.

The

motor

speed

is

indpendent

of

voltage,

temperature,

and

load

variation.

lt

can

only

fluctuate

with

the

mains

frequency.

Two

motor

pulleys

permit

adaptation

to

the

mains

frequency

of

either

50

or

60

Hz;

one

pulley

(116)

is

showin

in

both

Fig.

2

and

Fig.

3.

For

50

Hz

use

the

pulley

part

no.

234

453,

for

60

Hz

use

the

pulley

part

no.

234

454.

The

driving

force

is

transmitted

to

the

turntable

(7)

by

belt

(15).

Speed

Selection

To

adjust

the

turntable

speed

to

either

33

1/3

or

45

rpm,

the

belt

(15)

is

shifted

to

the

one

step

of

pulley

(116)

with

the

associated

diameter

(see

Fig.

3).

This

is

achieved

when

you

adjust

the

speed

lever

(18)

so

that

the

START/STOP

lever

(48)

and

the

spring

lever

will

move

the

change-over

lever

into

the

desired

(33

or

45

rpm)

position.

When

the

record

player

is

turned

oft,

the

change-

over

lever

is

blocked

by

the

blocking

bar

(12)

and

the

speed

is

just

preselected.

Only

when

the

turntable

(7)

starts

running,

the

blocking

bar

(12)

will

release

the

change-over

lever.

The

latter

will

then

shift

the

belt

(15)

to

that

step

of

motor

pulley

(116)

which

corresponds

to

the

desired

speed.

Turntable

The

turntable

(7)

is

secured

to

the

turntable

bearing

tube

by

the

lock

tab

(151).

To

remove

the

turntable,

lift

its

top

layer

through

one

of

its

cutouts

and

rotate

the

turntable

until

the

cutout

is

positioned

above

the

motor

pulley.

Remove

the

belt

(15)

from

the

motor

pulley

(116)

and

place

lt

onto

the

turntable.

Continue

rotating

the

turntable

until

the

cutout

is

positioned

above

the

turntable

lock

tab

(151);

press

the

latter

outward

and

lift

oft

the

turntable.

Slacken

the

screw

(150).

Belt

To

replace

the

belt

(15),

first

remove

the

turntable

as

above

des-

cribed,

then

separate

the

belt

from

the

turntable

(7).

Mount

the

new

belt

on

the

turntable..

NOTE:

the

ground

(mat)

surface

of

the

belt

should

face

the

driven

gart.

Install

the

turntable

and

place

the

belt

(15)

over

the

motor

pulley

(116).

To

Replace

the

Motor

Pulley

1.

Separate

the

belt

(15)

from

pulley

(116)

and remove

the

turn-

table.

Remove

the

toothed

belt

(109).

2.

Disengage

the

tension

spring

(114)

from

the

shield

(122).

3.

Unscrew

the

hex.

nut

(110),

remove

the

setting

cam

(111),

belt

pulley

(112),

and

counter

bearing

(113).

4.

Slacken

the

grub

screws

(106)

and

slide

oft

the

motor

pulley

(116).

Slide

the

replacement

pulley

onto

the

motor

shaft.

Remove

the

taper

sleeve.

Pay

attention

on

the

internal

distan-

ce

roller.

Position

the

motor

pulley

(116)

at

proper

height

above

the

mounting

plane,

see

Fig.

3.

Uniformly

tighten

the

grub

screws

(117).

Put

the

taper

sleeve

into

the

motor

pulley

(116).

5.

Mount

the

counter

bearing

(113),

the

belt

pulley

1

(112)

and

the

setting

cam

(111)

and

secure

them

in

place

with

hex.

nut

(110).

Install

the

tension

spring

(114)

and

the

toothed

belt

(109).

Mount

the

turntable.

Pull

the

belt

(15)

and

place

lt

around

the

motor

pulley

(116).

6.

Turn

the

kno

(16)

to

adjust

the

belt

pulley

to

its

mid

Posi-

tion.

(The

nose

of

the

belt

pulley

(112)

should

poin't

to

the

motor

pulley

center

line.)

Adjust

the

hex.

nut

(110)

to

the

rated

speed;

the

speed

increases

when

you

turn

the

nut

clock-

wise

and

vice

versa.

4

Stroboscope

Even

during

the

play

mode

the

stroboscope

can

be

used

to

check

the

accuracy

of

the

turntable

speed

adjustment

to

33

1/3

and

45

rpm.

Accurate

adjustment

is

manifested

by

seemingly

motionless

bar

marks

of

the

stroboscope.

I

f

the

marks

run

in

the

same

direction

as

the

turntable,

the

speed

is

too

high

and

vice

versa.

To

vary

the

adjustment,

operate

the

"pitch"

knob

(16).

The

strobo

marks

on

the

turntable

rim,

shovvn

in

Fig.

12,

have

the

following

meanings

(starting

from

the

lowest

row):

33

1/3

rpm

at

60

Hz,

33

1/3

rpm

at

50

Hz,

45

rpm

at

60

Hz,

45

rpm

at

50

Hz.

To

exchange

the

glow

lamp

GI

(245),

remove

the

screws

(248)

and

the

strobo

case

(244).

Fig.

5

R1

D1

R2

C2

Fig.

6

Motor

connection

scheme

1

GI

C1.

Tuning

to

the

Pitch-of-tone

Level

This

feature

is

independent

of

the

power

and

controls

both

turn-

table

speeds.

The

tuning

range

is

max.

6

%

or

about

one

semi-

note.

When

you

rotate

the

knob

16,

you

will

move

the

belt

pulley

2

(105).

This

motion

will

be

transferred

by

the

toothed

belt

(109)

to

the

belt

pulley

1

(112

in

Fig.

9).

As

a

result,

the

counter

bearing

(113)

and

taper

sleeve

of

motor

pulley

(116)

are

shifted

upwards

or

downwards,

respectively.

The

taper

sleeve

of

the

motor

pulley

(116)

causes

the

pulley

diameter

to

be

reduced

or

increased,

which

permits

the

variation

of

the

rated

speed

within

the

said

range

of

±

3

%.

Fig.

7

Fig.

9

105

13

16

109

112

111

110

116

113

zzA

,

5

Fig.

10

45

47

46

63

42

43

44

64

66

67

200

202

To

Replace

the

Spring

Case

Remove

the

tone

arm

(58)

from

the

bearing

frame

(55)

as

described

on

this

page.

Slacken

the

lock

nut

(47)

and

the

grub

screw

(46).

Unscrew

the

bearing

screw

(66).

NOTE:

Left-hand

thread.

Lift

the

bearing

frame

(55).

Remove

washer

(65)

and

spring

case

(64).

When

reassembling,

make

sure

the

helical

spring

snaps

into

the

cutout

of

bearing

frame

(55).

Slide-in

the

washer

(65).

Tighten

the

bearing

screw

(66).

Install

the

tone

arm

(50).

Adjust

the

bearing

backlash

with

the

grub

screw

(47)

and

the

lock

nut

(46)

as

below

described.

To

Adjust

the

Tone

Arm

Bearings

Exactly

balance

the

tone

arm.

Both

bearings

should

have

a

small,

just

perceptible

backlash

or

play.

Proper

adjustment

of

the

hori-

zontal

bearing

is

achieved

if

the

tone

arm

can

freely

slide

from

the

record

inside

to

outside

while

the

anti-skating

adjustment

is

0.5.

Proper

adjustment

of

the

vertical

bearing

is

achieved

when

the

carefully

kicked

tone

arm

swings

into

balanced

position..

Adjust

the

backlash

by

grub

screws

(44)

and

(46)

for

the

horizontal

and

vertical

bearing,

respectively.

Fig.

11

Tone

Arm

with

Bearings

The

light-weight

torsion-resistant

aluminum-tube

tone

arm

has

a

universal

gimbal

bearing

characterized

by

four

hardened

and

lapped

steel

points

located

in

high-precision

ball

bearings.

The

tone

-arm

bearing

friction

is

thus

reduced

to

a

minimum,

namely

less

than

0.10

mN

or

0.010

gr

in

vertical

and

less

than

0.40

mN

or

0.040

gr

in

horizontal

direction,

referred

to

the

stylus

point.

This

ensures

particularly

satisfactory

tracking

conditions.

Before

adjusting

the

tracking

force,

which

should

comply

with

the

pick

-

up

system

used,

adjust

the

tone

arm

to

its

balanced

position

while

the

tracking-force

scale

indicates

zero.

For

coarse

balancing,

shift

the

weight

(51)

with

mandrel;

for

fine

balancing,

rotate

the

weight.

This

weight

permits

balancing

of

pickup

systems

weighing

bet-

ween

4.5

and

10

gr

including

mounting

material.

The

tracking

force

is

produced

by

tensioning

the

helical

spring

located

in

the

spring

case

(64).

The

'atter

has

a

scale

with

marks

permitting

exact

adjustment

of

the

tracking

force

within

the

range

0-

50

mN

(or

0

-

5

9r).

To

Remove

die

Tone

Arm

from

its

Bearing

Frame

1.

Mbunt

the

record

player

in

the

servicing

fixture

(repair

ijg).

Remove

the

weight

(51)

and

tensioning

screw

(58).

Adjust

the

scale

of

the

spring

case

(64)

to

zero.

2.

Turn

the

record

player

into

head

position.

Remove

the

shield

(149).

Unsolder

thetone-arm

leads

from

the

muting

switch

(146).

3

Record

player

in

normal

position.

Screw

the

two

mounting

screws

(60)

counterclockwise

until

they

abutt

against

the

bearing

frame

(55).

NOTE:

Bayonet

union.

Shift

the

tone

arm

to

the

rear

and

lift

it

from

the

bearing

frame

(55).

To

assemble,

proceed

in

reversed

sequence.

To

Remove

Tone

Arm

Complete

with

Bearings

1.

Mount

the

record

player

in

the

repair

jig.

Adjust

the

tracking-

force

scale

on

the

spring

case

(64)

to

zero.

Lock

the

tone

arm

(50)

in

place.

Remove

the

weight

(51).

2.

Adjust

record

player

to

head

position.

Remove

the

shield

(149).

Unsolder

the

tone

-arm

leads

from

muting

switch

(146).

3.

Remove

the

main

lever

(177).

Remove

the

lock

washer

(242).

Rotate

the

set

screw

(42)

until

guide

bearing

(241)

and

set-

ting

bar

(228)

come

free.

Remove

lock

washer

(228)

and

set-

ting

bar

(204).

4.

Unlock

the

tension

spring

(212),

loosen

the

lock

washer

(216)

and

remove

skating

lever

(215).

64

5.

Remove

lock

washer

(202)

from

segment

(200).

6.

Remove

hex.

nuts

(202)

and

segment

(200).

7.

Hold

the

tone

arm

(50).

Remove

hex.

nut

(42)

and

washer

(41).

Remove

tone

arm

complete

with

bearings.

To

install

the

tone

arm,

proceed

in

reversed

order.

Anti-Skating

Device

To

adjust

the

anti-skating

force,

operate

the

pointer

scale

provi-

ded

on

the

cover

(67).

Depending

on

this

adjustment,

the

skating

lever

(215)

will

be

deflected

from

the

tone

-arm

pivot

point.

The

anti-skating

force

is

transmitted

by

the

tension

spring

(212)

to

the

segment

(200)

and

thus

to

the

tone

arm

(50).

The

factory

adjustment

is

optimal

for

any

stylus

having

a

spheri-

cal

tip

radius

of

15

/Im

or

elliptical

of

5

-

6

and

18-

221.1m

as

well

as

for

CD

4

pickup

systems.

These

factory-adjusted

values

may

bevaried

only

m

an

authorized

Dual

service

workshop

using

a

Dual

Skate

-0

-Meter

and

a

test

record.

6

Fig.

12

I

I

11

,1. I .

7

11111

1

1

3

1

e

n

:A

il i

Z

yd

r

Al

e

: l

a

s

%

13

.

BB13

Ni

•

Mama

B

IENEN WO min ..i.

z

!

204

219

223

218

Tone

Arm

Lift

When

you

move

the

lift

control

bar

(218)

to

the

LIFT

position

V

,

the

tone

arm

will

be

lifted

and

in

position

LOWERY

it

will

be

lowered

through

the

lift

cam

(219)

and

the

setting

bar

(204).

The

tone

arm

lift

has

priority

over

the

set-down

mechanism.

When

the

record

player

is

started

with

the

control

bar

(218)

in

the

LIFT

position

V

,

the

set-down

mechanism

will

move

the

tone

arm

across

the

record

in

the

auto

mode.

Lowering

of

the

tone

arm

will

take

place

only

atter

you

have

adjusted

the

control

bar

(218)

to

the

POWER

position

1.

The

height

of

lift

should

be

3

to

5

mm;

it

can

be

adjusted

by

the

setscrew

(40).

To

Replace

the

Lift

Plate

(158)

1.

Remove

the

main

lever

(177)

and

the

lock

washer

(242).

Rotate

the

setscrew

(42)

until

guide

bearing

(241)

and

set-

ting

bar

(204)

are

released.

Remove

lock

washer

(228)

and

setting

bar

(204).

2.

Unhook

the

tension

spring

(212),

loosen

lock

washer

(216)

and

remove

skating

lever

(215).

3.

Remove

lock

washer

(206)

and

disk

(205).

Detach

the

shut-

off

bar

(179)

from

segment

(200).

4.

Remove

hex.

nuts

(202)

and

segment

(200).

5.

Remove

the

screws

(15)

and

the

lift

plate

(158).

To

reassemble,

proceed

in

reversed

order.

Tone

Arm

Control

The

tone

arm

motions

for

auto

lowering

and

lifting

are

con-

trolled

by

cams

under

the

cam

wheel

(161)

while

the

wheel

rotates

through

360

0

.

Lifting

and

lowering

motions

are

controlled

by

the

main

lever

(177)

and

lifting

bolt

while

the

horizontal

motions

of

the

tone

arm

are

controlled

by

lever

(177)

with

the

segment

(200).

The

lifting/lowering

mechanism

is

active

for

30

-cm

and

17

-cm

re-

cords;

it

is

coupled

to

the

turntable-speed

change-over

function.

The

tone

-arm

set-down

points

are

determined

by

the

spring

pin

of

segment

(200)

abutting

against

the

setting

bar

(204).

The

horizon-

tal

motion

is

limited

by

the

segment

abutting

against

the

setting

bar

(204)

which

is

lifted

only

during

the

set-down

Operation

by

the

main

lever

(177)

and

thus

comes

into

the

sluing

range

of

the

spring

pin

provided

on

the

segment.

After

the

tone

arm

has

been

set

down

on

the

record,

the

setting

bar

(204)

is

released

and

returns

to

its

nromal

position,

thus

es-

caping

from

the

range

of

the

spring

rin.

The

tone

arm

is

thus

free

to

move

in

horizontal

direction

during

the

play-back.

Fig.

13

241

72

177

202

200

204

242

241

40

179

215

Fig.

15

230

225

204

Fig.

16

Fig.

17

196

207

161

195

186

192

193

247

248

A

179

164

PR

166

161

a.)

b.)

The

Starting

Sequence

When

you

adjust

the

START/STOP

lever

to

the

START

position,

the

turn-on

lever

(207)

is

rotated

to

the

outside

and

will

trigger

the

following

functions:

a)

The

turn-on

lever

(207)

rotates

the

shift

links

(193)

seated

on

the

riffled

pins

(183).

At

the

same

time,

the

power

switch

is

turned

on

(135)

and

both

the

motor

(132)

and

turntable

start

rotating.

b)

The

shift

link

(193)

enters

the

range

of

the

reversing

lever

which

is

forced

into

its

start

position

by

the

subsequent

ro-

tation

of

the

cam

wheel

(161).

c)

Operation

of

the

START/STOP

lever

(48)

will

also

release

the

start

angle

(191)

that

is

pulled

towards

the

cam

wheel

by

the

tension

spring

(192).

The

shut-off

lever

isthus

brought

into

the

range

of

dog

M

on

the

turntable

pinion

(PR)

(Fig.

17)

and

the

cam

wheel

is

driven.

Manual

Start

When

the

tone

arm

is

guided

towards

the

record

manually,

the

pawl

(236)

coupled

to

the

shift

arm

(186)

will

engage

with

the

square

bolt

mounted

in

the

deck

plate

and

will

keep

the

shift

arm

in

this

position.

Coupled

to

the

shift

arm

is

the

shut-off

lever

(189)

that

will

turn

on

the

power

switch

and

thus

initiate

the

turntable

rotation.

When

the

run-out

groove

of

the

record

played

has

been

reached,

the

tone

arm

is

restored

and

the

record

player

is

turned

off

by

automatic

means.

If

you

lift

the

tone

arm

before

the

end

of

play

and

put

it

back

onto

its

support,

the

bolt

of

segment

(200)

will

release

the

engaged

position

of

the

pawl

(236)

so

that

the

shift

arm

is

returned

to

its

initial

position

and

the

power

switch

will

turn

off.

Continuous

Play

This

mode

is

operative

when

you

have

adjusted

the

knob

(69)

to

00

.

The

knob

(69)

will

rotate

the

reversing

angle

(231)

and

the

!atter

is

forced

into

the

starting

position

by

the

turn-on

lever

(207)

at

the

end

of

record,

the

tone

arm

is

restored

to

its

rest

position

on

the

support

near

the

record

rim.

This

procedure

will

be

repea-

ted

until

the

START/STOP

lever

(48)

is

adjusted

to

STOP

or

the

knob

(69)

is

adjusted

to

no.

1

position.

Muting

Switch

The

muting

switch

is

provided

to

avoid

noisy

lifting

and

lowering

of

the

tone

arm

in

the

auto

made.

The

contact

springs

of

both

channels

are

controlled

by

the

cam

wheel.

The

resulting

short-cir-

cuiting

of

the

pickup

leads

is

ineffective

in

the

rest

state

of

the

record

player.

Adjustment

In

the

zero

position

of

the

cam

wheel,

a

contact

separation

of

about

0.5

mm

should

exist

between

the

contact

springs

(F)

and

the

shorting

straps

(L)

in

Fig.

16.

I

f

necessary,

bend

the

shorting

straps.

Maintain

contact

springs

in

good

state

by

a

spraying

agent.

Final

Shutting-off

The

shutting-off

and

stop

functions

are

control

led

by

the

reversing

lever

U.

Lever

U

is

brought

into

the

stop

position

by

the

main

lever

(177)

(longer

leg

of

the

reversing

lever

towards

the

cam

wheel

center).

The

shut-off

bar

(179)

is

dragged

during

the

play

in

proportion

to

the

motion

of

segment

(200).

The

shutting-off

operation

after

the

end

of

record

is

triggered

by

the

dog

(M)

of

the

turntable

(7)

and

by

the

shut-off

lever

(A)

in

Fig.

17.

In

the

shut-off

range

for

records

116—

122

mm

in

diameter,

the

shut-off

lever

(A)

approaches

the

dog

under

control

of

the

shut-

off

bar

(179).

(See

Fig.

17

a).

The

dog

(M)

engages

with

lever

(A),

which

will

displace

the

cam

wheel

(161)

from

its

zero

position

and

make

it

engage

with

the

pinion

(PR)

(Fig.

17

b).

The

main

lever

(177)

returns

the

tone

arm

that

can

then

lower

itself

on

its

support.

When

the

cam

wheel

runs

up

to

its

zero-engagement

position,

the

nose

(186)

of

the

shift

arm

can

run

into

the

recess

left

in

the

cam

wheel

and

operate

the

power

switch

(135).

8

Stop

Circuit

When

you

adjust

the

lever

(48)

to

STOP,

the

srart

angle

(1911

is

released

and

pulled

towards

the

cam

wheel

by

tension

spring

(1921.

As

a

result,

the

shut-off

lever

is

brought

within

the

range

of

the

dog

(M)

on

the

pinion

(PR)

of

the

turntable

and

the

cam

wheel

(161)

becomes

driven.

The

reversing

lever

remains

in

its

stop

position.

Adjustments

Tone

Arm

Set

-down

Point

Slightly

pprey

up

the

nameplate

"Dual"

at

its

lower

left

corner

and

swivel

lt

outwards

(Fig.

19).

The

now

accessible

opening

will

show

one

of

the

adjusting

screws.

Set

-down

Point

for

30

-cm

Records

Adjust

the

speed

selector

1181

to

the

"45"

position

and

correct

adjustment

with

a

screwdriver.

If

the

stylus

sets

down

too

far

on

the

record

inside,

rotate

the

adjusting

screw

clockwise.

If

the

stylus

is

lowered

outside

the

30

-cm

record,

rotate

the

screw

counter-

clockwise.

Set

-down

Point

for

17

-cm

Records

Adjust

the

speed

selector

(181

to

the

"33"

position

and

rotate

the

screw

as

above

described

for

adjustment.

Shut-off

Point

In

the

shutting-off

range

for

records

116

—

122

mm

in

diameter,

the

excenter

(S)

on

segment

(200)

(Fig.

18)

can

be

used

to

vary

the

shut-off

point.

Fig.

18

Defect

Turntable

does

not

start.

Cause

a)

Belt

is

not

in

place.

b)

Motor

is

not

powered.

c)

Motor

pul

ley

has

come

loose.

Tu

rntable

speed

unsatisfac-

a)

Motor

pulley

does

not

tory.

comply

with

mains

frequency.

b)

Belt

sl

ips

on

motor

pul

ley

or

turntable.

c)

Excessive

bearing

friction.

Fig.

19

Tone

Arm

Lift

Height

This

height

for

the

auto

mode

can

be

adjusted

with

the

aid

of

the

setting

sleeve

(156).

Pull

the

mains

plug.

Disengage

the

tone

arm.

Rotate

the

cam

wheel

(161)

out

of

its

zero

position

until

the

tone

arm

has

reached

its

greatest

lift

height.

The

height

above

the

tone

arm

support

stop

should

be

about

7

mm

as

shown

in

Fig.

20.

If

necessary,

rotate

the

setting

sleeve

(156)

clockwise

or

anticlockwise

as

required.

Fig.

20

Repair

a)

Mount

the

belt.

b)

Check

switch

base

and

mains

plug.

c)

Tighten

it.

a)

Exchange

it.

b)

Clean

all

contacting

surfaces

of

belt

and

pulleys,

if

necessary

replace

the

belt.

cl

Clean

and

relubricate

the

bearings.

9

Defect

Tone

arm

improperly

lowered

(too

fast

or

not

on

record).

Acoustic

Feedback

Rated

speed

borders

pitch

adjustment

range.

Replacement

parts

Cause

Shock-absorbing

action

of

sil

icone

oh

l

in

lift

tube

is

ex-

cessive

or

insufficient.

a)

Chassis

parts

(e.g.

connecting

leads)

hit

bench

cutout.

b)

Connecting

leads

are

strained.

Positioning

of

belt

pulley

(1)

is

inaccurate.

Pos.

Part.-No.

Oty.

Description

1

214

054

1

Washer

4

220

213

1

Centering

piece

6

244

460

1

Turntable

I

ining

7

246

738

1

Turntable

cpl.

8

234

428

1

Carrier

cpl.

9

210

472

2

Fillister

head

screw

M

3

x

4

10

210

586

1

Washer

3.2

11

232

086

1

Retaining

spring

12

234

430

1

Locking

rail

cpl.

13

232

087

1

Retaining

spring

14

210

194

1

Grip

ring

15

246

084

1

Flat

belt

16

234

912

1

Control

knob

17

232

078

1

Bearing

bush

18

234

910

1

Speed

lever

19

237

222

1

Speed

cover

20

213

260

3

Grooved

drive

stud

21

237

414

3

Transport

lock

22

246

740

1

Built-in

plate

cpl.

23

237

226

2

Spring

suspension

cpl.

(motor

side)

237 227

1

Spring

suspension

cpl.

(pick

-up

arm

side

front)

237

228

1

Spring

suspension

cpl.

(pick

-up

arm

side

rear)

24

230

529

4

Threaded

coupling

25

236

710

2

Pressure

spring

(motor

side)

236

711

1

Pressure

spring

(pick

-up

arm

side

front)

236

712

1

Pressure

spring

(pick

-up

arm

side

rear)

26

200

723

4

Rubber

absorber

27

200

722

4

Pot

30

246

741

1

Pick

up

head

cpl.

31

237

223

1

Contact

plate

cpl.

32

236

242

1

Fixture

TK

24

38

210

472

1

Fillister

head

screw

39

234

599

1

Reset

cam

Repair

Demount

the

lift

plate

(15)

,

remove

the

control

stud

(154),

lock

washer

(155),

and

setting

sleeve

(156)

with

lock

washer;

remove

lift

bolt

and

pressure

spring,

clean

lift

tube

and

lift

bolt.

Evenly

apply

WACKER

SILICONE

'Oft

AK

500

000

to

the

lift

bolt.

Reassemble

the

parts.

al

Al

ign

cutout

by

installation

instructions.

b)

Loosen

or

extend

the

cables.

Adjust

knob

(16)

to

mid

position;

adjust

hex.

nut

(110)

to

rated

speed

(clockwise

adjustment

will

increase

the

speed

and

vice

versal

.

Safety

regulations

Servicing

of

electronic

equipment

should

be

performed

only

by

authorized

service

personnel.

During

service

the

unit

has

to

be

operated

with

an

isolated

trans-

former.

Safety

requirements

(e.

g.

VDE

0860

H)

haveto

be

strictly

observed

during

repair.

In

order

to

not

reduce

safety,

the

original

design

of

the

unit

should

not

be

changed,

e.

g.

cover

plates,

mechanically

secured

wiring,

tracking

and

creepage

distance

in

air

etc.

Use

only

factory

replacement

parts

which

must

be

reinstalled

per

original

design.

Upon

completion

of

repair

make

shure

that

all

accessible

and

conductive

parts

do

not

carry

line

voltage.

Pos.

Part.-No.

Oty.

Description

40

240

069

1

Adjusting

screw

41

210

643

1

Washer

4.2/12/1

42

210

366

1

Hex

nut

43

234

635

2

Counter

nut

44

230

063

1

Grub

screw

45

240

962

1

Frame

cpl.

46

234

634

1

Grub

screw

47

234

635

2

Counter

nut

48

244

785

1

Switch

lever

49

246

744

1

Support

cpl.

50

246

743

1

Pick

up

arm

cpl.

51

240

964

1

Weight

52

210

147

1

Locking

washer

4

53

238

666

1

Mandril

54

233

744

1

Stay

55

242

098

1

Bearing

frame

56

236

160

2

Support

plate

57

239

565

2

Fillister

head

screw

M

2.5

x

3

58

241

447

1

Clamping

screw

59

238

201

1

Thread

plate

60

238

202

2

Locking

screw

61

237

672

1

Groove

drive

stud

1.4

x

6

62

238

623

1

Pointer

63

242

099

1

Bearing

cpl.

64

-2-343

-

5te-

1

Spring

casing

cp1.226

Q6

)

7

65

237

563

1

Washer

66

237

564

1

Bearing

screw

67

246

746

1

Rear

cover

68

200

444

6

Spring

washer

69

240

151

1

Rotary

knob

70

246

747

1

Front

cover

100

210

146

3

Locking

washer

3.2

101

232

096

1

Svvitch

lever

102

232

071

1

Clip

spring

103

232

094

1

Connection

part

104

232

079

1

Shouldered

nut

10