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Dual

October

1976

Edition

502

Service

-

Manual

Dual

Gebrüder

Steldinger

•

7742

St.

GeorgenISchwarzwald

Download from www.dual.de

Not for commerical use

Fig.

1

Pick

-up

connection

diagram

"ssuars

,'

right

channel

,

C

I

i----i

red

I I

-

_C

m

C

)

1

connection

plate

right

channel

red

Mass

right

channel

green

Mass

sheet

Contact

biete

at

tonearm

head

Record

red

green

Cartridge

inner

side

of

groove

left

channel

—

I

02

left

channel

2

white

s

Tonearm

audio

cable

rd

with

miniature

plug

5-pin

right

channel

red

lead

left

channel

white

lead

b)

with

phono

plug

black

white

(red)

(yellow)

bleck

left

channel

white

Mass

left

channel

blue

___

0

1

white

blue

Tonearm

head

Spring

contacts

between

plug-in

cartridge

head

and

tonearm

outer

side

of

groove

right

channel

2

Contents

Page

Pick

-up

Connection

Diagram

2

Specification

3

Motor

and

Drive

4

Replacement

of

motor

pulley

4

Setting

nominal

speed

4

Tonearm

and

Tonearm

Suspension

5

Removal

of

tonearm

from

bearing

frame

5

Removal

of

tonearm

assembly

with

tonearm

bearing

5

Replacement

of

spring

housing

5

Adjusting

the

tonearm

bearing

6

Anti-Skating

device

6

Cue

Control

6

Replacement

of

cue

control

assembly

7

Starting

and

Shut-off

7

Tonearm

not

parallel

to

platter

8

Platter

does

not

start

after

connecting

the

unit

to

power

line

and

moving

the

tonearm

inwards

8

Platter

does

not

reach

nominal

speed

8

Stylus

slips

out

of

playing

groove

8

Tonearm

does

not

lower

or

lowers

onto

record

too

quickly

when

cue

control

is

operated

8

Acoustic

feedback

8

Exploded

views

10,

11

Spare

parts

9,

11,

13

Lubrication

14

Specification

Current

type

AC

50

or

60

Hz,

selected

by

exchanging

drive

pulley

Line

voltages

110

—

130

volts

and

220

—

240

volts

Motor

and

Drive

Dual

8

-pole

synchronous

motor

with

flat

belt

drive

system

Power

Consumption

<

10

watts

Current

Consumption

with

220V

50

Hz,

about

75

mA,

with

110V

60

Hz

about

140

mA

Platter

Non-magnetic,

1.3

kg,

300

mm

dia.

Platter

speeds

33

1/3

and

45

rpm

Overall

speed

variation

<-±

0.09

%

(assessed

in

accordance

with

DIN

455071

Signal-to-noise

ratio

Rumble

weighted

signal-to-noise

ratio

>

62

dB

acc.

to

DIN

45

500

Rumble

unweighted

signal-to-noise

ratio

>

41

dB

Tonearm

Torsion-resistant

aluminum

tonearm

in

four-point

gimbal

suspension

Tonearm

Bearing

Friction

vertical

<

0.007

p

horizontal

<

0.016

p

Pick

-up

Head

Detachable,

suitable

for

all

pick

-up

cartridges

with

Dual

catch

mounting

and

1/2"

mounting

and

a

deadweight

of

4.5

—

10

g

(including

hardvvare)

Tracking

Force

0

—

3

p

continuously

variable,

with

1/10

p

calibration

in

the

range

from

0—

1.5

p,

reliable

as

from

0.5

p

tracking

force

Weight

approx.

4.2

kg

For

dimensions

and

cutout

refer

to

Installation

I

nstructions.

3

Fig.

2

Motor

and

Drive

Motor

and

Drive

38

123

107

K

8

6

4

11

10

-

‘33111111W

r

Fig.

3

Fig.

4

Motor

field

coil

connections

220-240V

The

turntable

platter

and

the

gear

are

dri—

ven

by

an

8

—pole,

synchronous

motor

(123)

suspended

by

radially

located

elastic

mounts

and

having

a

very

small

stray

magnetic

field

am

well

am

little

vibration.

The

speed

of

the

motor

is

a

function

of

li—

ne

voltage,

temperature

and

load

variations.

Speed

is

dependent

on

and

proportional

to

line

frequency.

The

motor

is

adapted

to

50

or

60

Hz

(cps)

by

the

correct

choice

of

mo—

tor

pulley.

Pulley

for

50

Hz,

Part.

No.

234

453

Pulley

for

60

Hz,

Part.

No.

234

454

The

drive

is

linked

to

the

platter

by

a

pre—

cision—ground

belt

(11).

When

replacing

the

flat

belt

(11)

be

sure

that

the

precision—

ground

surface

of

the

belt

(dull

finish)

closely

contacts

the

drive

pulley

(107)

and

the

platter.

Platter

speeds

of

33

1/3

and

45

rpm

are

ad—

justed

by

linking

the

flat

belt

(11)

to

the

corresponding

step

of

the

drive

pulley

(116)

(Fig.

3).

Corresponding

to

the

actuation

of

the

speed

selector

(12)

the

control

lever

is

brought

to

the

appropriate

position

of

nominal

speeds

(33

1

/

3

or

45

rpm)

via

the

change—

over

lever

(101).

When

the

unit

is

electri—

cally

shut

off

the

changeover

is

blocked

by

locking

bar

(7).

Consequently,

the

speed

is

only

preselected.

After

switching

on

the

unit

and

turning

the

platter

(10)

the

lock—

ing

bar

(7)

disengages

the

changeover

layer

thus

guiding

the

flat

belt

(11)

to

appropri—

ate

step

of

the

pulley.

Replacement

of

Motor

Pulley

1.

Remove

flat

belt

(11)

from

motor

pulley

(116).

Undo

machine

screw

(125)

and

sli—

de

back

locking

bar

(126).

Remove

platter

(10).

.2.

Loosen

set

screws

(108)

and

pull

off

dri—

ve

pulley

(107).

3.

Put

complete

replacement

drive

pulley

on

motor

axle.

Remove

conical

sleeve.

Tigh—

ten

set

screws

(108)

uniformly.

Place

conical

sleeve

into

the

motor

pulley

(107).

4.

Put

platter

(10)

into

bearing

housing

(157)

and

secure

with

lock

bar

(126).

Re—

tighten

machine

screw

(125).

Put

the

flat

belt

on

the

drive

pulley.

5.

Check

nominal

speed

with

the

strobe

disk.

If

necessary,

readjust

as

described

below.

Uni

rig

of

nominal

speed

Lift

platter

mat

(3)

above

one

of

the

reces—

ses

(A)

and

turn

platter

(10)

by

hand

so

that

the

drive

pulley

(107)

becomes

visible.

Hold

the

drive

pulley

(107)

and

turn

the

co—

nical

sleeve

(K).

If

the

nominal

speed

is

too

high,

turn

the

conical

sleeve

(K)

counterclockwise.

If

the

speed

is

too

low

turn

the

conical

sleeve

clockwise.

Check

by

means

of

a

strobe

disk

and

repeat

adjustment,

if

necessary.

4

(4,

•

Secure

unit

in

repair

jig.

Remove

weight

(50).

Unscrew

straining

screw

(54)

and

set

tracking

Farce

to

zero

(65).

2.

Move

unit

into

head

position.

Remove

screening

plate.

Unsolder

tonearm

leads

an

the

connecting

plate

(142).

3.

With

the

unit

in

normal

position

screw

the

two

mounting

screws

SW

4.5

-

(57)

counterclockwise

to

the

stop

in

the

'frame

(55).

Attention!

Observe

bayonet

slide

mounting.

Slide

tonearm

rearwards

and

re-

move

lt

from

the

bearing

frame

(55).

When

reinstalling

the

tonearm

proceed

in

reverse

order.

Removal

of

tonearm

assembly

with

tonearm

bearing

Proceed

as

follows:

1.

Tormarrin

and

lbinearnn

Bearing

The

Dual

502

has

a

light,

torsion

resistent

all-metal

tonearm

which

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

mini-

MUM

Bearing

friction:

vertical

Bearing

friction:

horizontal

▪

0.07

mN

(0.007

p)

▪

0.16

mN

(0.016

p)

related

to

stylus

point.

As

a

result,

lt

ensures

extremely

favorable

pick

-up

conditions.

Before

adjusting

the

tracking

force

to

suit

the

built-in

pick

-up

cartridge

the

tonearm

should

be

balanced

with

the

scale

set

to

0.

Coarse

adjustment

is

carried

out

by

moving

the

stem

(50),

the

subsequent

fine

adjustment

by

turning

the

counterweight

is

designed

so

that

pick

-up

cartridges

with

a

deadweight

(incl.

hardwa-

re)

of

4.5

to

10

g

can

be

balanced.

The

tracking

force

is

adjusted

by

turning

the

coil

spring

mounted

in

the

spring

housing

(65).

The

spring

housing

is

provided

with

a

scale

with

markings

(0

-

30

mN/0

-

3

p)

which

allow

precise

setting

of

tracking

Far-

ce.

One

division

corresponds

to

1

mN

(0.1

p)

within

the

range

of

0.2

-

1.5

p,

and

2.5

mN

(0.25

p)

within

the

range

of

15

to

30

mN

(1.5

-

3

p).

Removal

of

tonearm

from

bearing

frame

1.

Secure

unit

in

repair

jig.

Set

tracking

force

scale

(65).

2.

Move

unit

into

head

position.

Remove

screening

plate

(144).

Unsolder

tonearm

leads

(142)

an

connecting

plate

(142).

3.

Disengage

compression

spring

(199)

an

bearing

frame

(yoke)

(198).

Turn

bearing

section

(177)

by

90

0

and

remove

it.

Re-

move

the

setting

bar

(176).

4.

Disengage

tension

fety

washer

(192)

ver

(191).

spring

(185),

undo

sa-

and

remove

skating

le-

5.

Remove

safety

washer

(189)

and

sliding

washer

(188).

Also

remove

shut-off

bar

(160)

from

segment

(184).

Fig.

5

Tonearm

bearing

46

61

60

55

64

180

187

45

44

65

67

47

184

6.

Undo

hex

nuts

(187).

Also

remove

segment

(184).

7.

Undo

hex

nut

(180).

Remove

tonearm

com-

plete

with

bearing.

When

attaching

the

tonearm

proceed

in

rever-

se

order.

However,

lt

should

be

properly

ad-

justed

when

mounting

the

segment

(184).

(Refer

to

page

7

).

Replacement

of

spring

housing

Remove

tonearm

(49)

from

bearing

frame

as

described

above.

Loosen

lock

nut

and

thread

pin

(44).

Unscrew

bearing

screw

(67).

Observe

left-handed

thread!

Lift

bearing

frame

(55).

Remove

disk

and

spring

housing

(65).

When

installing

the

spring

housing

make

sure

that

the

helical

spring

catches

the

recess

of

bearing

frame

(55).

Slide

in

washer

(66).

Tighten

bearing

screw

(67).

Reinstall

tonearm

(49).

Using

threaded

pin

(44)

and

lock

nut

(45)

adjust

bearing

play

as

described

below.

Fig.

6

Tonearm

bearing

(bottom

view)

64

54

50

191

187

184

176

160

5

Adjustment

of

tonearm

bearings

Anti-Skating

Device

First

balance

tonearm

exactly.

Both

bearings

must

haue

slight,

just

perceptible

play.

The

horizontal

tonearm

bearing

is

correctly

ad-

justed

when

at

anti-skating

settings

"0.5"

and

being

touched

lt

slides

in

without

re-

sistance.

The

vertical

tonearm

bearing

is

correctly

adjusted

when

lt

swings

in

fter

being

touched.

The

play

of

the

horizontal

tonearm

bearing

should

be

adjusted

with

threaded

pin

(44),

the

play

of

the

vertical

tonearm

bearing

with

threaded

pin

(60).

Fig.

7

Anti-Skating

The

anti-skating

force

is

set

by

turning

the

pointer

disk

(69).

According

to

the

setting

the

asymmetrical

cam

plate

(73)

mo-

ves

the

skating

lever

(191)

from

its

center

of

rotation.

The

anti-skating

force

is

transmitted

by

the

tension

spring

(185)

to

the

segment

(184)

and,

finally,

to

the

to-

nearm

(49).

Optimum

adjustment

is

carried

out

by

the

manufacturer

for

styli

with

a

tip

radius

of

15

gm

(conical)

and

5/6

x

18/22

µm

(ellip-

tical)

as

well

as

for

CD

4

pick

-up

cartrid-

ges.

Alterations

can

be

made

only

with

the

aid

of

the

Dual

Skate

-O

-Meter

and

the

test

record

and

should

only

be

done

by

an

autho-

rized

Dual

Service

Station.

Recheck

as

follows:

Balance

tonearm

(49).

Set

pointer

disk

to

0

(69).

Now

the

tonearm

should

remain

in

any

position

of

its

moving

range.

The

ho-

le

of

the

skating

lever

(191)

should

align

the

center

line

of

the

tonearm.

This

is

ad-

justable

with

the

eccentric

pulley

accessi-

ble

through

the

hole

in

the

mounting

plata

(38)

between

the

pointer

disk

(69)

and

the

bearing

base

(47)

(Fig.

13).

The

set

knurled

ring

(69)

to

"0.5".

Now

the

tonearm

should

return

from

the

center

of

the

platter

to

its

rest

(77).

Cue

Control

The

cue

control

permits

gentle

set-down

of

the

tonearm

at

any

desired

point

(outside

the

shut-off

range)

on

the

record.

By

moving

the

lever

(194)

(moving

forwards)

lift

cam

(197)

rotates.

The

slide

bar

(176)

connected

to

lt

transmits

this

movement

to

the

lift

pin

which

then

raises

the

tonearm.

After

Moving

the

tonearm

into

the

desired

position

on

the

record.

The

lever

is

releas-

Fig.

8

Cue

Control

ed

by

gently

moving

to

the

rear.

As

a

re-

sult,

slide

bar

(176)

is

released

and

the

tonearm

lowers

slowly.

Lowering

of

the

to-

nearm

is

damped

by

silicone

oil

in

the

lift

pin.

The

height

of

the

stylus

above

the

record

can

be

varied

by

turning

adjusting

bush

(179).

The

distance

is

reduced

by

turning

clockwise.

The

distance

between

record

and

stylus

can

be

increased

by

turning

counter-

clockwise.

The

distance

presst

by

the

fac-

tory

is

approx.

8

mm.

3

,

4

U

geeree>

194

197

176

193

177

175

6

179

183

Fig.

9

Replacement

of

Cue

Control

Assembly

1.

Secure

unit

in

repair

jig,

and

lock

to—

nearm.

2.

Move

unit

into

head

position.

3.

Disengage

compression

spring

(199)

an

bearing

yoke

(198).

Turn

bearing

section

(177)

by

90

0

and

remove

it.

Also

detach

slide

bar

(176).

4.

Disengage

tension

spring

(185),

loosen

lockwasher

(192)

and

skating

lever

(191).

5.

Remove

lockwasher

(189)

and

slide

washer

(188).

Remove

shut—off

bar

(160)

from

segment

(184).

6.

Loosen

hex

nuts

(187).

Remove

segment

(184).

7.

Remove

lockwasher

(166)

and

washer

(165),

disengage

catch

(164).

8.

Remove

machine

screw

(181).

Hold

tonearm

bearing.

Unscrew

hex

nut

(180)

and

com—

plete

cue

control

assembly

(178).

9.

Secure

tonearm

against

dropping

out

using

hex

nut

(206).

For

installation

of

the

cue

control

assembly

(178)

proceed

in

the

reverse

order.

When

mounting

the

segment

(184)

make

sure

that

it

is

properly

adjusted

as

described below.

Starting

and Shut

-

off

Turning

the

tonearm

(49)

rotates

the

segment

(184)

thus

actuating

the

power

switch

(127)

via

pawl

(164)

and

shift

arm

(170)

and

start—

ing

motor

(123)

and

platter

(10)

rotating.

The

shut—off

cycle

after

playing

a

record

is

initiated

by

the

dog

(M)

of

the

platter

(10)

and

shut—off

lever

(34).

The

shut—off

lever

(34)

is

guided

onto

the

dog

by

the

movement

of

the

tonearm

when

play—

ing

the

record

with

the

aid

of

the

shut—off

bar

(160)

proportionate

to

the

groove

lead.

The

eccentrically

mounted

dog

forces

the

shut—off

lever

(34)

back

with

each

revolu—

tion

as

long

as

the

advance

of

the

tonearm

only

amounts

to

the

width

of

one

groove

(Fig.

17

a).

Only

the

run—out

groove

with

its

in—

creased

lead

guides

the

shut—off

lever

(34)

onto

the

dog

at

a

higher

rate

so

that

the

shut—off

lever

is

picked

up

and

moves

along

(Fig.

17

b).

As

a

result,

the

shift

arm

im

brought

into

its

neutral

position,

the

power

switch

inter—

rupting

power

supply.

Simultaneously,

the

lift

actuating

lauer

(170)

coupled

to

the

shift

arm

(170)

is

actuated

and

the

tonearm

(49)

lifted.

Adjustment

Points

1.

Segment

a)

Lock

tonearm

(49).

Move

unit

into

head

position.

The

center

hole

(0

of

segment

(184)

should

be

centrically

above

the

frame

axis

(46).

The

play

between

the

pawl

(164)

and

the

stop

(A)

of

segment

(184)

should

be

0.3

to

0.5

mm.

This

is

adjustable

after

loosening

hex

nuts

(187)

and

by

moving

the

segment

(184).

b)

The

shut—off

point

can

be

changed

by

the

eccentric

pulley

an

the

segment

(184).

(Fig.

11).

Fig.

10

10

Fig.

11

34

37

160

7

Fig.

12

7

E

3

'

wau

3mm

2.

Paul

Move

tonearm

(49)

inwards.

The

play

be-

tween

the

stop

pin

(8)

and

the

shift

arm

(170)

and

the

mounting

plate

(124)

should

be

0.2

to

0.5

mm.

Adjust

by

turning

ec-

centric

pulley

(E),

if

necessary.

3.

Power

Switch

Extract

power

plug

from

receptacle!

Move

tonearm

to

its

rest.

Power

switch

should

not

switch

off

before

the

tonearm

(49)

is

approx.

3

mm

before

its

rest

(Fig.

12).

Adjust

by

bending

the

shift

arm

(146).

Defect

Fig.

13

Pick

-up

head

not

parallel

to

platter.

Defect

Platter

does

not

run

after

the

power

plug

of

the

unit

has

been

plugged

into

the

p0

-

wer

line

receptacle

and

the

tonearm

mo-

ved

inwards.

Platter

does

not

co-

me

up

to

its

requi-

red

speed.

Stylus

slips

out

playing

groove.

Tonearm

does

not

wer

on

record

or

wers

onto

record

quickly.

Cause

a)

b)

c)

a)

b)

c)

Belt

(11)

not

pro-

perly

put

on.

Power

supply

to

motor

(123)

inter-

rupted.

Drive

pulley

(107)

slackened.

Drive

pulley

(107)

is

not

correct

for

local

line

frequency.

Slippage

between

flat

belt

and

dri-

ve

pulley

(107)

or

flat

belt

(11)

and

platter

(10).

Nominal

speed

ma-

ladjusted.

of

Steel

ball

(161)

for

shut-off

bar

missing.

lo-

Damping

silicone

oil

lo-

in

cue

control

tube

too

excessive

or

too

low.

Acoustic

feedback.

a)

Chassis

components

(e.g.

connecting

leads)

rubbing

on

board

cut

out.

b)

Connecting

leads

too

tight.

Cause

The

pick

-up

head

has

been

moved

out

of

Po-

sition

on

the

tonearm

tube

during

transport.

Rmmedy

Remove

platter.

Using

a

screw

driver

slacken

screw

on

the

pick

-up

head

through

the

hole

provided

for

this

purpose

in

the

chassis

plate.

After

aligning

the

pick

-up

head

re-

tighten

screw.

Reime

a)

Install

belt

properly

put

on.

b)

Check

connection

on

switch

plate

(13Z,

and

power

supply

plug.

c)

Retighten

drive

pulley

(107).

a)

Replace

drive

pulley

(107).

b)

Clean

friction

surfaces

of

flat

belt

(11,

,

drive

pulley

(107)

and

platter

(10).

Re

-

neu

flat

belt,

if

necessary.

c)

Readjust

nominal

speed.

Replace

steel

ball

(161).

Remove

cue

control

assembly

(178)

(rarer

to

page

7).

Unscrew

adjusting

bush

(179),

remo-

ve

lift

pin

(183).

Remove

compression

spring.

Clean

lift

tube

and

lift

pin

and

smear

even-

ly

with

"Wacker

Silicone

Oil

AK

500

000".

Reassemble

parts.

Wipe

off

excessive

silico-

ne

oil

after

assembly.

a)

Line

up

mounting

board

cut-out

according

to

installation

instructions.

b)

Slacken

or

lengthen

leads.

8

Replacement

Parts

44,

Pos.

Part.

No.

Description

Qty.

1

220

213

Centring

disc

1

2

236

036

Washer

1

3

240

958

Turntable

mat

complete

1

4

234

428

Support

assembly

1

5

210

472

Machine

screw

AM

3

x

4

5

6

232

086

Tension

spring

1

7

237

220

Locking

bar

1

8

234

814

Tension

spring

1

9

210

194

"C"

clip

G

2

x

6

1

10

240

959

Turntable

complete

with

mat

1

11

234

435

Flat

belt

1

12

237

976

Speed

control

knob

1

13

240

960

Speed

control

blind

compl.

1

14

213

260

Pin

2

x

6

6

19

239

414

Shipping

screw

compl.

3

20

210

146

Lock

washer

3.2

8

21

201

632

Rubber

washer

3

22

237

117

Washer

3

23

237

118

Lock

washer

3

24

237

668

Special

screw

3

26

237

223

Contact

plate

compl

1

27

234

611

Handle

1

28

210

182

Bowed

lock

washer

1

29

210

630

Washer

4.2/8/0.5

1

30

210

197

"C"

clip

G

4

x

8

1

31

237

224

Tonearm

head

compl.

1

32

236

242

TK

24

Cartridge

mount

1

33

210

142

Lock

washer

1.2

1

34

234

766

Shut—off

lever

1

35

210

146

Lock

washer

3.2

8

36

234

764

Friction

plate

1

37

234

762

Support

1

38

240

961

Chassis

compl.

1

39

230

529

Threaded

piece

4

40

236

710

Compression

spring

(Motor

side

rear)

1

236

711

Compression

spring

(Motor

side

front)

1

236

712

Compression

spring

(Tonearm

side

rear)

1

236

713

Compression

spring

(Tonearm

side

front)

1

41

237

226

Spring

mount

compl.

(Motor

side

rear)

1

237

227

Spring

mount

compl.

(Motor

side

front)

1

237

228

Spring

mount

compl.

(Tonearm

side

rear)

1

237

229

Spring

mount

compl.

(Tonearm

side

front)

1

42

200

723

Rubber

damping

block

4

43

200

722

Steel

cup

4

44

234

635

Lock

nut

2

45

234

651

Grub

screw

1

46

240

962

Frame

compl.

1

47

240

963

Cover

compl.

1

48

239

193

Fillister

head

screw

M

3

x

6

3

49

237

232

Tonearm

compl.

1

50

240

964

Weight

compl

1

51

233

744

Yoke

1

52

236

160

Support

plate

2

53

239

565

Machine

screw

M

2.5

x

3

2

54

238

461

Clamp

bolt

1

55

240

966

Bearing

rock

1

56

238

201

Plata

1

57

238

202

Fixing

screw

1

58

238

623

Needle

1

59

237

672

Pin

1

60

234

635

Lock

nut

2

61

230

063

Grub

screw

1

62

236

049

Set

screw

1

63

218

894

Lock

washer

1

64

240

967

Bearing

compl.

1

65

236

907

Spring

housing

compl

1

66

237

563

Washer

1

67

237

564

Bearing

screw

1

68

240

968

Anti—Skating

compl

1

69

238

183

Washer

with

needle

1

70

238

182

Numeral

washer

1

71

200

444

Spring

washer

2

72

216

867

Lock

washer

1

73

225

176

Curve

washer

1

74

210

362

Hex

nut

M

3

5

75

240

969

Cover

front

compl.

1

76

213

260

Pin

2

x

6

6

9

Fig.

14

Exploded

view

of

parts

above

the

chassis

plate

rIn

(29

L _

_

Jg

0

-- Cb

0 -

-4

-

L2J

-CD

10