Dual 621 User manual

Dual

Edition

August

1978

621

Service

-

Manual

eutornetic

1

q

,

lECT DRIVE

Dual

Gebrüder

Steidinger

•

7742

St.

GeorgenISchwarzwald

Download from www.dual.de

Not for commerical use

Co

ntents

Page

2

Technical

data

3/4

Wiring

diagram

5

Audio

connection

diagram

6

Dual

EDS

500

electronic

direct

drive

System

6

Replacement

of

motor

electronic

6

Replacement

of

motor

mechanic

7

Adjustment

of

nominal

speeds

7

Setting

78

rpm

nominal

speed

7

Stroboscope

7

Pitch

control

8

Tonearm

and

tonearm

suspension

8

Removal

of

tonearm

from

bearing

frame

8

Removal

of

tonearm

compl.

with

tonearm

suspension

8

Removal

of

spring

housing

9

Adjustment

of

tonearm

suspension

9

Antiskating

control

9

Cue

control

9

Replacement

of

cue

control

assembly

10

Tonearm

Control

10

Continuous

Play

10

Start

10

Manuel

Start

11

Stopping

11

Muting

Switch

11

Shutt-off

Mechanism

11

Adjustment

Points:

Tonearm

set

Down Point

Shut

off

Point

12

Tonearm

vertical

lift

12

Power

switch

12

Pick

-up

Head

not

Parallel

Correct

nominal

speed

obtained

only

at

13

extreme

setting

of

pitch

control

13

Stylus

slips

out

of

record

groove

Tonearm

does

not

set

down

or

lowers

13

onto

record

too

quickly

13

Vertikal

Tonearm

lift

13

Platter

does

not

start

13

Tonearm

does

not

set

down

correctly

Motor

does

not

shutt-off

Acoustic

feedback

14

—

17

Replacement

with

exploded

views

18

Lubrication

Technical

Data

Current

AC

50

to

60

Hz

Line

voltage

110

to

125

V,

220

to

240V

Drive

electronically-regulated

direct-drive

system,

Dual

EDS

500

Power

input

approximately

2

watts,

Motor

at

playing

Operation

<

50

mW

Power

consumption

220

V

50

Hz:

at

play

15

mA

110

V

60

Hz:

at

play

approximately

25

mA

Time

from

start

to

rated

speed

2

—

2.5

s

at

33

1/3

rpm

Platter

non-magnetic,

dynamically

balanced,

detachable

1.3

kg,

304

mm

diameter

Platter

speed

33

1/3

and

45

rpm,

electronically

adjustable

Pitch

control

Separate

for

both

speeds,

each

adjustable

by

means

of

variable

resistor,

with

calibration

scale;

range

of

regulation:

10

%

Speed

control

(monitoring)

with

illuminated

stroboscope

for

platter

speeds

33

1/3

and

45

rpm,

adjustable

to

50

or

60

Hz.

Sensitivity

of

the

illuminated

strobe

6

division

markings

per

minute

at

50

Hz,

(for

0.1

%

speed

deviation)

7.2

division

markings

per

minute

at

60

Hz,

Total

wow

and

flutter

according

to

DIN

45

507

(German

Industry

Standard)

<-±

0.06%

Rumble

Unweighted:

>

45

dB

(according

to

DIN

45

5001

Weighted:

>

65

dB

Tonearm

Torsionally

rigid

tubular

aluminum

tonearm

in

low-friction

four-point

gimbal

suspension,

tonearm

counterbalance

with

two

mechanical

anti-resonance

filters.

Effective

length

of

tonearm

222

mm

Offset

angle

25°

20'

Tangential

tracking

error

0.16

0

/cm

Tonearm

bearing

friction

vertical

<

0.07

mN

10.007

g)

(related

to

stylus

tip)

horizontal

<

0.16

mN

(0.016

g)

Stylus

pressure

from

0

to

30

mN

10

to

3

g)

infinitely

variable

with

1

mN-

11/10

g)

calibrations

from

0

to

15

mN

(0

to

1.5

g)

,

operable

from

2.5

mN

10.25

g)

stylus

pressure

up.

Cartridge

holder

removable,

accepting

any

cartridges

with

1/2"

mounting

and

a

weight

from

4.5

to

10

grams

(including

mounting

hardware).

Adjustable

Overhang

5

mm

Cartridge

see

separate

data

sheet

Mounting

dimensions

and

mounting

board

cut

out:

see

Installation

instructions

2

Fig.

1

D

1

A

cl

47

bi

1.1

2

66

2/3

Hz

(33

minl)

C2

C3

220p

0,47

p

R3

68

k

R2

G2

R6

R4

22

k

10

k

82

k

C4

0,47

µ

•

R

1

M

Ti

R5

1

M

--

1

G

1

BC

172

Transistoren

von

der

Anschlußseite

gesehen

Transistors

as

seen

from

the

connecting

side

Transistors

vus

du

cöte

des

connexions

LILJL

EBC

BD

415

E

•

rl

•

C

BC

172

BC

238

C

C5

—

10

n

C6

in

G3

n

33

—C

7

—

1

n

G4

4*

R8

10k

R7

47

k

T2

BC

172

B

C

8

T

0,22

bt

IC

von

der

Bestückungsseite

gesehen

as

seen

from

the

top

side

vu

du

cöte

elüments

4069

555

1

2

5

3

6

8

4

7

1

4

2

3

8

3

8.2

R

16

560

i

n

45

9

k

10

4k

2

8

4

6

IC

2

—

555

—

3

7

1

5

R

11

110k

G5

G6

—c9

—

20

n

R

13

15k

D2

1

N

4148

,C

10

—

0,47

R

15

10

k

-

113

14

220

k

C

13

47

bi

—

13

R

12

270

k

110/130

V-

220/240

V

-

C

11

10

µ

R

17

47

k

Si

63

mAT

10

n

=

9

C

52--

47

n

C

51

—

68

n

R

52

12k

A

D

51

/ \

By

183

R

51

22

k

12

8.1

7

•

T3

BC

238

C

R

18

2

T4

NSD

102

(BD

415)

20,5

VI

cr

z

1

)

10

220

V

52

19

52

51

10

16,5

V

—

C

55

-1-

54

20

n

13

16

14

15

17

11

12

51

53

18

13

55

54

4

Fig.

2

TA-Anschlußschema

/

Audio

Connection

Diagram

/

Schema

de

branchement

/

Esquema

de

conexion

del

fono

captor

a)

mit

DIN-Stecker

5-polig

/

with

DIN-plug

5

avec

fiche

DIN

5

pöles

/

con

enchufe

DIN

de

5

poles

rechter

Kanal

right

channel

canal

droit

canal

derecho

rot

/

red

/

rouge

/

roje

linker

Kanal

left

channel

canal

gauche

canal

izquierdo

weiß

/

white

/

blanc

/

blanc

\

Tonabnehmerkabel

Tonearm

audio

cable

Ca

ble

de

BF

Cable

del

fonocaptor

•

b)

mit

Cynchstecker

/

with

phono

plug

avec

fiche

cynch

/

con

enchufe

Cynch

j

f

i

rechter

Kanal

/

right

channel-

1

-

Canal

droit

/

Canal

derecho

!

rot

(schwarz)

/

red

(bleck)

i

rouge

(noir)

/

rojo

(negro)

I

•

J

Masse

draht

/

Mass

lead

Mass

cable

/

Mass

cable

V '

rechter

Kanal

right

channel

canal

droit

I

-

1

r

1

canal

derecho

I

I I I

rot

/

red

/

rouge

/

rojo

1

I I

I

Masse

rechter

Kanal

Mass

right

channel

1

Masse

canal

droit

masa

canal

derecho

grün

/

green

/

vert

/

verdc

I

1

e

-

^

I I

LJ

717

1

L

I

_1

Masse

rechter

Kanal

-

1

Mass

right

channel

Masse

canal

droit

mass

canal

derecho

-I

linker

Kanal

I

left

channel

1

canal

gauche

1

canal

izquierdo

/

white

/

blanc

/

blanco

I

1

Masse

linker

Kanal

1

Mass

left

channel

1

Masse

canal

gauche

mass

canal

izquierdo

blau

/

blue

/

bleu

/

azul

/

/‚

Masse

schwarz

Mass

black

Masse

noir

Masa

negro

Masseblech

Mass

sheet

Prise

de

masse

chapa

de

mass

Kontaktplatte

Contact

plate

Plaque

de

contacts

Placa

de

contacto

r

--linker

Kanal

/

left

channel

Canal

droit

/

Canal

izquierdo

I

gelb

(weiß)

/

yellow

(white)

jaune

(blanc)

/

amarillo

(blanco)'

1

Cynch-Tonabnehmerkabel

I

Pick

-up

lead

with

Cynch

plug

Cäble

de

BF

avec

fiche

Cynch

I

Cable

del

fonocaptor

con

I

enchufe

Cynch

1

—

Masse

linker

Kanal

Mass

left

channel

Masse

canal

gauche

mass

canal

izquierdo

^

_

J

Kurzschließer

Muting

switch

Court-circuiteur

Dispositivo

cortocircuitador

/

Z

/

ZZ

11111

Tonarm

kopf

Tonearm

head

Täte

magnetique

Cabezal

fonocaptor

5

Fig.

3

Direct

Drive

System

Dual

EDS

500

Fig.

4

Fig.

5

Netzteil

ei

Supply

unit

Bloc

secteur

4111

Generator

Generateur

418

1.

Ti

C3,

)2

T

C2

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

seif

tapping

screws

(112)

and

cover

of

power

part

(113).

3.

Loosen

connection

for

operating

voltage

on

power

plate

(109).

Unsolder

connecting

leads

on

speed

control

(129),

turn

switch

(5)

and

generator.

Open

twists

of

holding

angle

(150)

with

flat

pliers.

4.

Pull

off

motor

electronics

(152)

system

from

motor

(18)

carefully.

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

Mechanic

1.

Extract

unit

plug

from

power

line.

Remove

platter

(4).

2.

With

the

unit

in

head

position

remove

seif

tapping

screws

(112)

and

cover

of

power

part

(113).

Loosen

connection

for

operating

voltage

on

power

plate

(109).

Drehzahlregler

/

1

I3

19

Platter

speed

switch

/

R

19

Commutateur

de

vitesse

/

R

19

C1

R16

•

R

F.

R8

R7r•

—

i1R101

-

6

—

-7

1

•

C

7

8

C7

Motor

Moteur

8.1

I

I 1

1

•-i

R13

F.,

Tcli

44,

D2

T2

• •

fl2

7

clo.Hu•

Ct

.

_ vr

'li

.-1

R15

I-•

T3

7

T4

6

3.

Unsolder

connecting

leads

to

rotary

switch

(5)

and

the

gene-

rator.

Open

twists

of

holding

angle

(150)

with

flat

pliers.

Lift

off

motor

electronic

(152).

Remove

machine

screw

(151)

and

holding

angle

(150).

4.

Loosen

threaded

pins

(15)

and

remove

platter

cone

(14).

Remove

the

three

screws

(148).

Lift

off

motor

mechanics

(149).

5.

Put

platter

cone

(14)

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

it

with

screws

(112).

6.

With

the

unit

in

normal

position

connect

it

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

(19

9)

on

the

motor

elec-

tronic

system

adjust

nominal

speeds.

Control

(13

8)

is

used

for

33

1/3

rpm,

R

9

for

45

rpm.

Check

with

strobe

disk.

Changeover

to

78

rpm

nominal

speed

Instead

of

45

rpm

the

Dual

621

can

be

changed

to

a

nominal

speed

of

78

rpm.

To

change

the

speed

bring

the

fine

speed

control

(129/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

can

make

with

the

"pitch"

control

(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

±

0.2

%

according

to

the

information

of

the

electricity

supply

companies

brief

frequency

fluctuations

up

to

1

%

are

possible

—

only

effect

the

stroboscope

indication

and

can

cause

the

lines

to

"wander"

although

the

platter

speed

is

as

constant

and

absolutely

accurate

as

before.

P

itch

Control

Each

of

the

two

standard

speeds

33

1/3

and

45

rpm

(78

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

ffi

seaLi

C52

fIJ

e

63

mA

mT

0

220V

110V

Motor

Moteur

Glimmlampe

Glim

lamp

Lampe

ä

effluves

Fig.

8

190

68

1

•

-,i

aii

1

7

K-

--

Iiiiim rM

1

,

1

111

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11

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1

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3

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iiihm1111111111'''

45 48

60

202

34

57

49

192

141

Tonearm

and

Tonearm

Suspension

The

feather-light,

extremely

torsion

resistent

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

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

144

143

219

208 206

170

Removing

the

tonearm

from

the

bearing

frame

1.

Clamp

unit

in

repair

jig.

Remove

weight

(49)

and

turn

out

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

5.5

(54).

For

installation

proceed

in

the

reverse

order.

Removal

of

tonearm

assembly

with

tonearm

bearing

We

recommend

the

following

procedure:

1.

Clamp

unit

in

the

repair

jig.

Set

spring

housing

scale

(60)

to

zero.

Lock

tonearm

(481.

Remove

weight

(491.

2.

Move

unit

into

head

position

and

remove

the

screening

plate

(140).

Unsolder

the

tonearm

connections

on

the

muting

switch

(137).

3.

Remove

lock

washer

(184).

Lift

off

main

lever

(183)

and

bearing

support

(182).

Remove

lock

washer

(144).

Lift

off

setting

rale

(141)

and

rotary

bearing

(143)

and

turn

towards

motor

(149).

4.

Unlock

tension

spring

(209).

Loosen

lock

washer

(212)

and

remove

skating

lever

(211).

5.

Remove

lock

washer

(211)

and

slide

bar

(171).

Lift

off

shut-

off

bar

(161)

from

segment

(208).

6.

Remove

hex

nut

(170).

Remove

sink

screw

(174).

Hold

tone

-

arm

(48)

and

lift

off

counter

bearing

(173)

and

segment

(208).

7.

Remove

tonearm

complete

with

tonearm

bearing.

Reverse

this

procedure

when

reassembling.

Please

bear

in

mind

the

threaded

(33)

is

correctly

positioned

in

the

ball

bearing.

Replacing

spring

housing

Remove

tonearm

(48)

from

bearing

frame

(51)

as

described

above.

Loosen

lock

nut

(55)

and

threaded

(56).

Unscrew

bearing

screw

(61).

Lift

bearing

frame

(59).

Remove

spring

hou-

sing

160).

When

installing

note

that

the

helical

spring

catches

the

bearing

frame.

Slide

in

washer

(60)

and

tighten

bearing

screw

(61).

Reinstall

tonearm

148).

Set

bearing

play

as

described

below

using

threaded

(56)

and

lock

nut

(55).

8

Fig.

10

ibr

6

44‘.

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

(33)

and

that

of

the

vertical

tonearm

bearing

with

threaded

(56).

A

nt

i-skat

i

ng

Device

To

compensate

for

skating

force

use

the

knurled

ring

166).

The

asymmetric

cam

plate

(213)

displaces

the

skating

lever

(211)

from

the

tonearm

pivoting

point.

The

anti-skating

force

is

trans-

mitted

to

the

segment

(208)

and

to

the

tonearm

(48)

by

tension

spring

(209).

Optimum

adjustment

is

carried

out

at

the

factorys

for

styli

having

a

tip

radius

of

15

/Im

(conical),

5/6

and

18/22

/I

m

(ellipti-

cal),

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

es

follows:

Balance

tonearm

(48)

correctly.

Set

knurled

ring

(66)

to

0.

The

tonearm

should

remain

at

any

desired

point

within

its

turning

range.

The

hole

of

the

skating

lever

(211)

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

(23)

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

(190)

forward

(

•

)

lift

cam

(192)

rotates.

The

slide

bar

(141)

transmits

the

lifting

movement

to

the

lift

(206),

that

raises

the

tonearm.

As

a

result,

the

cue

control

per

-

m

its

raise

up

the

tonearm

at

any

desired

point.

The

lever

(190)

is

released

by

moving

the

cue

control

lever

rear

wards

(X

l.

As

a

result

of

the

action

of

compression

spring

(205)

the

lift

(206)

is

brought

back

to

its

normal

position

and

the

tonearm

loweres

slowly.

Lowering

of

the

tonearm

is

damped

by

silicone

oh

l

in

the

lift

tube.

Adjustment

Point

The

lift

can

be

varied

by

turning

the

sleeve

(45).

The

distance

between

the

record

and

the

needle

should

be

5

-7

mm.

Replacement

of

Cue

Control

Platts

Replace

cue

control

plate

(207)

as

follows:

1.

Clamp

unit

in

the

repair

jig.

and

lock

tonearm.

Turn

unit

in

head

position.

2.

Remove

safety

washer

(184).

Lift

off

main

lever

(183)

and

bearing

support

(182).

3.

Remove

safety

washer

(144).

Lift

off

positioning

bar

(141)

and

rotary

bearing

(143)

and

turn

towards

motor

(149).

4.

Remove

both

machine

screws

(204),

remove

lift

plate

compl.

(207).

For

installation

proceed

in

the

reverse

order.

Fig.

11

Fig.

12

Tonearm

Control

Automatic

movement

of

the

tonearm

is

initiated

by

the

control

cams

on

the

inside

of

the

cam

wheel

(16)

on

rotating

through

360°.

The

control

elements

for

raising

and

lowering

are

the

main

lever

(183)

and

lifting

bolt

(206),

for

horizontal

movement

the

main

lever

(183)

with

segment

(208).

The

automatic

tonearm

set

down

mechanism

is

designed

for

30

cm

and

17

cm

records

and

is

coupled

to

the

platter

speed

changeover.

The

setdown

points

of

the

tonearm

are

determined

by

the

spring

of

segment

(208)

contacting

the

slide

bar

(141).

Limitation

of

the

horizontal

movement

of

the

tonearm

is

pro-

duced

by

the

of

segment

contacting

the

stop

attached

to

the

slide

bar

(189).

Only

during

set-down

does

main

lever

(183)

lift

the

slide

bar

(141)

and

the

stop

attached

to

it

which,

as

a

result,

moves

into

the

swivel

range

of

the

stop

fitted

on

the

segment.

After

completion

of

set

down

(lowering

of

the

tonearm

onto

the

record)

slide

bar

(141)

is

released

again

and

returns

to

its

neutral

position.

As

a

result,

the

slide

bar

(141)

moves

out

of

the

swivel

range

of

the

pin,

so

that

unimpeded

movement

of

the

tone

arm

is

possible

for

playing.

Continuous

Play

Continuous

Play

is

switched

on

by

turning

the

rotary

knob

(67)

to

"0:2".

The

rotary

knob

(67)

turns

the

switch

angle

(185).

The

switch

rod

(189)

keep

the

change

lever

(180)

in

starting

position.

After

the

record

has

been

played

the

tonearm

returns

automa-

tically

to

the

lead-in

groove

of

the

record.

This

procedure

is

re-

peated

until

the

switch

lever

(68)

is

brought

to

the

"stop"

posi-

tion

or

the

rotary

knob

(67)

to

position

"1".

Adjustment

Point

Pull

meins

plug.

Remove

platter

(4).

Bring

rotary

knob

(67)

to

position

"03".

Turn

cam

wheel

to

central

position.

The

change

lever

(180)

turns

the

guide

lever

(U)

and

the

top

of

the

guide

lever

must

at

least

be

brought

to

the

cam

range.

Adjust

by

bending

the

switch

rod

(189).

Start

Switching

the

switch

lever

(68)

into

the

"starr

position

initi-

ates

the

following

sequence:

a)

The

start

lever

(219)

rotates

the

switch

lever

(180)

which

is

pivoted

about

the

notched

stud.

At

the

same

time,

the

switch

arm

(41)

is

moved

the

motor

(149),

via

the

power

switch.

(116),

and

the

platter

starts

turning.

b)

Operating

the

switch

lever

(68)

also

releases

the

start

slide

(38)

which

is

drawn

toward

the

cam

by

means

of

the

tension

spring

(156).

By

that

the

shut-off

lever

engage

with

the

drive

pinion

and

the

cam

turns.

Manual

start

The

latch

(215)

which

is

connected

to

the

switch

arm

(411

en-

gages

in

the

four-sided

plate

when

the

tonearm

is

moved

manu-

ally.

The

switch

arm

connects

the

mains

supply

to

the

motor

(1491

via

the

power

switch

(116)

and

the

platter

rotates.

When

the

run-out

groove

of

the

record

is

reached,

the

tonearm

is

lifted

and

returned,

the

motor

is

switched

off

automatically.

If

the

tonearm

is

lifted

off

the

record

before

the

run-out,

and

re-

turned

by

hand

to

the

pilier,

then

the

bolt

on

the

segment

(208)

engages

the

latch

(215)

so

that

the

switch

arm

is

returned

to

its

starting

position.

This

switches

off

the

mains

supply.

Fig.

13

Fig.

14

67

185

189

141

38

68

219

193

166

135

10

Stopping

When

control

lever

is

set

to

"stop

position

the

start

slide

(38)

which

is

pulled

towards

the

cam

by

means

of

tension

(34),

be-

comes

free.

As

a

result,

the

shut-off

lever

is

moved

into

the

range

of

dogs

cam.

The

lever

remains

in

its

stop

position.

Muting

Switch

To

prevent

disturbing

noises

during

automatic

operation

of

the

tonearm

the

unit

is

fitted

with

a

muting

switch.

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

muting

switch.

This

clearance

should

be

adjusted

by

bending

the

muting

switch

contacts.

The

contacts

should

be

sprayed

with

a

suitable

cleaning

agent.

Shut-off

The

shut-off

and

stop

functions

depend

on

the

Position

of

the

guide

lever

(U).

The

guide

lever

(U)

is

brought

to

stop

position

by

the

main

lever

(183)

after

every

Start

(

longer

end

of

the

guide

lever

towards

cam

wheel

centre).

The

shut-off

bar

(161)

is

guided

along

in

proportion

to

the

mo-

vement

of

the

segment

(208).

The

shut-off

procedure

is

imitated

after

a

record

has

been

played

by

the

dog

(M)

of

the

platter

and

the

shut-off

lever

(A).

The

shut-off

lever

(A)

is

moved

towards

the

dog

(M)

of

the

plat-

ter

within

the

shut-off

range

(record

diameter

116

mm

to

122

mm)

(Fig.

16

a).

The

dog

engages

the

shut-off

lever

(A).

The

cam

wheel

(16)

is

moved

from

0

position

and

engage

with

the

drive

pinion

of

the

platter

(Fig.

16

b).

The

main

lever

(183)

guides

the

tonearm

back

and

effected

the

tonearm

to

return

to

its

rest

position.

During

the

running

in

of

.

the

cam

wheel

into

0

position

the

roll

(42)

of

the

switch

arm

(41)

can

run

into

the

cut-out

provided

at

the

cam

wheel

and

achate

the

power

switch

(116).

Adjustment

Points

Tonearm

set-down

point

The

set-down

point

can

be

varied

with

the

eccentric

bolt

(176).

if

the

stylus

sets

down

onto

the

record

too

far

inside

or

outside

turn

eccentric

bolt

(176)

in

left

or

right

direction.

Fig.

15

Fig.

16

a.)

b.)

Fig

17

45

U/min

50Hz

45

U/m

in

60Hz

33

U/min50Hz

33U/min

60Hz

11

Fig.

18

Shut-off

Point

The

shut-off

point

(shut-off

area

of

record

diameter

122

mm)

can

be

varied

with

the

eccentric

(E)

mounted

on

the

segment

(208).

Tonearm

vertical

lift

With

the

adjustable

sleeve

(202)

the

tonearm

vertical

lift

(for

automatic

Operation)

can

be

adjusted.

Pull

out

the

mains

plug,

unlock

the

tonearm,

turn

the

cam

wheel

(16)

until

the

tonearm

reaches

its

highest

point.

The

tonearm

should

now

be

approxi-

mately

4

mm

above

the

pillar

stop.

Adjust

by

means

of

sleeve

(202)

,

-

turn

left

or

right.

Adjust

a

play

of

0.1

mm

between

shaft

and

coupling

plate

(of

the

tonearm)

with

the

sleeve

(57).

(Measured

at

the

tonearm

app.

0.5

mm).

Power

Switch

Turn

in

tonearm

(48).

The

slide

(117)

of

the

power

switch

(116)

should

have

a

play

of

0.2

—

0.5

mm.

Adjust

by

bending

the

switch

arm

(41).

Defect

Tonearm

head

not

parallel

to

platter.

Cause

Seat

of

tonearm

head

on

the

tonearm

tube

has

changed

during

transit.

Remedy

Remove

platter.

Insert

screwdriver

through

the

hole

in

the

chassis

mounting

plate.

Align

tonearm

head

and

retighten

screw.

Fig.

19

Fig.

20

Fig.

21

ca.

6mm

f

114

(IP

-

•

12

Defect

Cause

Remedy

-416,

Speed

lies

at

limit

of

the

range

of

adjust-

ment

of

the

pitch

control

Stylus

slides

out

of

playing

groove

Nominal

speed

is

maladjusted.

Readjust

nominal

speed,

described

on

page

7.

a)

Tonearm

is

not

a)

Balance

tonearm

balanced

b)

Tonearm

tracking

b)

Adjust

force

to

the

value

stated

by

the

cartridge

manu-

force

is

too

low

facturer

cl

Anti-skating

setting

c)

Correct

anti-skating

setting

incorrect

d)

Stylus

tip

worn

or

d)

Renew

stylus

chipped

e)

Excessive

bearing

e)

Check

tonearm

bearings

and

readjust

if

necessary

friction

in

tonearm

bearing

f)

Steel

ball

(162)

of

f)

Renew

steel

ball

shut-off

bar

(161)

m

is-

sing

Tonearm

moves

with

a)

Antiskating

device

treck

ing

force

and

anti-

maladjusted

skating

scale

in

0-position

b)

Tight

tonearm

leads

outwards

or

inwards

cause

a

torque

Tonearm

does

not

set

down

on

record

or

lowers

too

quick

ly

when

operating

the

cue

control

lever

(190)

Vertical

tonearm

move-

ment

shows

resistance

Platter

does

not

turn

after

switching

unit

on

and

moving

tonearm

in

side

Tonearm

does

not

set

down

at

the

lead-in

groove

of

the

record

Motor

does

not

switch

off

when

tonearm

set

down

on

rest.

Acoustic

feedback

a)

Readjust

anti-skating

device

asdescribed

on

page

9.

b)

Slacken

leads

Excessive

or

insuffidient

Remove

cue

control

plate

(207).

Remove

shaft

(200)

and

damping

as

a

result

of

washer

(201).

Remove

adjustment

bush

sleeve

(212).

Remove

contamination

of

the

washer

(203).

Remove

lift

(206)

and

compression

spring

si

licone

oil

in

the

lift

(205).

Clean

lift

tube

and

lift

pin.

Smear

lift

evenly

with

tube

"Wacker

Silicon

Oil

AK

300

000".

Reassemble

components.

Excessive

friction

of

Lift

(205)

in

guide

tube

Power

supply

to

motor

interruppted.

Power

fuse

(110)

defect

See

obove,

if

necessary

change

the

lift

(206)

Replace

the

fuse

(110)

Tonearm

set-down

point

The

tonearm

set-down

point

can

be

adjust

with

the

eccentric

is

incorrectly

sei

bolt

(176)

Suppressor

capacitor

in

power

switch

ist

faulty

(short

circuit).

a)

Chassis

components

(e.g.

connecting

leads)

rubbing

on

board

cut

out

b)

Connecting

leads

too

tight.

Replace

suppressor

capacitor

in

power

switch

a)

Line

up

mounting

board

cut-out

according

to

installation

instructions

b)

Slacken

or

lengthen

leads.

13

Replacement

parts

Pos.

Part.No.

Qty.

Description

1

220

213

1

Centering

disc

2

214

054

1

Washer

3

244

460

1

Turntable

mat

compl.

4

244

461

1

Turntable

compl.

with

mat

5

238

034

1

Rotary

switch

6

242

184

1

Rotary

knob

7

242

189

1

Rotary

knob

camp'

.

8

242

191

3

Threated

9

244

462

1

Pitch

control

cover

10

200

444

8

Spring

washer

11

239

414

3

Shipping

screw

compl

.

13

210

147

3

Lock

washer

4

14

242

192

1

Platter

cone

15

242

191

3

Threated

M

3

x

3

16

246

035

1

Cam

wheel

compl.

17

232

975

3

Spring

mount

compl.

(power

transformer

side

back)

237

228

1

Spring

mount

camp'.

(Tonearm

side

front)

18

230

529

4

Threated

piece

19

230

523

3

Compression

spring

(Power

transformer

side

back)

236

712

1

Compression

spring

(Tonearm

side

front)

20

200

723

4

Rubber

damping

21

200

722

4

Steel

cup

24

234

582

1

Tension

spring

25

244

463

1

Tonearm

head

compl.

26

237

223

1

Contact

plate

compl.

27

234

611

1

Handle

28

210

182

1

Lock

washer

4.2/8

29

210

630

1

Washer

4.2/8/0.5

30

210

197

1

"C"

cl

ip

31

236

242

1

Holder

32

234

635

2

Stop

nut

33

230

063

1

Threated

34

242

602

1

Frame

compl

.

35

242

677

1

Mach

ne

screw

36

233

710

1

Tension

spring

37

210

146

8

Lock

washer

38

242

786

1

Start

slider

39

210

361

2

Hex

nut

40

242

768

1

Bush

41

242

765

1

Svvitch

lever

42

242

785

1

Roll

43

200

650

1

Rubber

sleeve

44

246

036

1

Mounting

plate

compl.

45

242

770

1

Adjustment

screw

48

244

466

1

Tonearm

compl

.

Pos.

Part.No.

Qty.

Description

49

244

467

1

Balance

weight

compl.

50

239

741

1

Pointer

51

246

037

1

Bearing

race

compl.

52

236

051

1

Clamp

screw

53

244 244

2

Washer

3.05/6/1.5

54

244

103

2

Hex

nut

2.9

x

6.5

55

234

635

2

Stop

nut

56

234

634

1 Threated

57

242

131

1

Adjustment

screw

59

246

039

1

Bearing

compl.

60

236

907

1

Spring

housing

compl

.

61

234

637

1

Bearing

screw

65

246

040

1

Cover

back

66

236

081

1

Ring

67

237

544

1

Rotary

knob

68

242

743

1

Switch

lever

compl.

69

246

041

1

Cover

front

70

200

444

8

Spring

washer

71

244

472

1

Support

compl.

172

210

362

1

Hex

nut

101

210

517

2

Machine

screw

M

4

x

10

102

210

648

2

Washer

4.2/14/1

103

242

283

2

Bush

104

209

939

2

Sleeve

105

210

480

4

Machine

screw

AM

3

x

6

106

227

548

2

Grommet

with

cord

stopper

107

228

209

1

Sleeving

108

242

284

1

I

nsulating

plate

109

244

473

1

Power

plate

compl

.

110

242

478

1

Fuse

T

0.063

A

C

51

225

322

1

Foil

68

nF/400

V/10

%

C

52

224

886

1

Paper

47

nF/250

V/20

%

C

53

222

760

2

Ceramic

20

nF/

50

V

C

54

222

760

2

Ceramic

20

nF/

50V

C

55

227

880

1

Elyt

1000µF/

40V

D

51

225

247

1

BY

183/300

D

52

227

344

4

1

N

4001

D

53

227

344

4

1

N

4001

D

54

227

344

4

1

N

4001

D

55

227

344

4

1

N

4001

R

51

232

402

1

Carbon

22

k2/0.25

W/5

%

R

52

232

401

1

Carbon

12

kS2/0.125

W/5

%

111

244

474

1

Power

transformer

112

210

283

2

Fillister

screw

113

244

475

1

Power

part

compl.

116

242

581

1

Power

switch

compl.

117

236

335

1

Slider

14

Fig.

22

Exploded

View

1

15

Fig.

23

Exploded

View

2

/

n

t

,

„1:3F=1„erä

16

Replacement

parts

Pos.

Part.No.

Qty.

Description

118

200

444

1

Spring

washer

119

233

012

1

Switch

plate

comp.

120

219

200

1

Snab

spring

121

239

732

1

Tension

spring

122

230

148

1

Switch

angle

123

241

883

1

Capacitor

10

nF/250

V

124

242

102

1

Cover

125

210

498

1

Machine

screw

M

3

x

28

126

231

079

1

Cable

holder

128

237

782

1

Nut

for

potentiometer

129

238

073

1

Speed

control-potentiometer

130

242

195

1

Contact

piece

131

210

587

1

Washer

3.2/7/1

132

210

362

1

Hex

nut

BM

3

133

242

187

1

Contact

assembly

134

210

469

1

Machine

screw

AM

3

x

3

135

242

741

1

Switch

lever

136

242

790

1

Contact

arm

137

242

612

1

Muting

switch

compl.

138

239

806

1

Base

shet

139

210

486

1

Machine

screw

AM

3

x

8

140

242

791

1

Screning

shut

141

242

769

1

Positioning

slide

142

244

834

1

Compression

spring

143

237

498

1

Rotary

bearing

144

210

145

2

Lock

washer

2.3

148

210

511

3

Machine

screw

AM

4

x

4

149

244

476

1

Motor

mechanic

150

242

233

1

Upholder

151

210

511

1

Machine

screw

AM

4

x

4

152

244

477

1

Motor

electronic

compl.

153

242

160

1

Stroboscope

trim

plate

154

210

469

1

Machine

screw

AM

3

x

3

155

242

158

1

Reflector

156

237

677

1

Unit

bottom

157

225

321

1

Glim

lamp

158

242

201

1

Reflector

159

237

679

1

Stroboscope

cover

160

210

472

2

Machine

screw

AM

3

x

4

161

242

763

1

Shut-off

lever

162

209

357

1

Ball

163

232

104

1

Ball

bearing

164

210

472

1

Machine

screw

AM

3

x

4

165

243

706

1

Ball

spring

166

242

771

1

Rotary

plate

167

210

146

8

Lock

washer

3.2

168

223

777

1

Control

stud

170

210

362

2

Hex

nut

171

201

187

1

Washer

172

210

145

3

Lock

washer

173

242

615

1

Bearing

174

203

475

1

Sunk

screw

M

3

x

8

175

242

792

1

Tension

spring

176

242

751

1

Excenter

177

242

748

1

plate

178

210

472

1

Machine

screw

AM

3

x

4

179

239

444

1

Tension

spring

180

242

775

1

Changeover

lever

181

210

146

8

Lock

washer

3.2

182

242

789

1

Bearing

183

246

042

1

Main

lever

compl.

184

210

147

4

Lock

washer

4

185

237

382

1

Switch

angle

186

237

383

1

Spring

187

210

549

1

Washer

2.1/5/0.5

188

210

353

1

Hex

nut

BM

2

189

242

774

1

Switch

slide

190

237

541

1

Lever

compl.

191

237

543

1

Rubber

sleeve

192

242

742

1

Curve

193

210

353

1

Hex

nut

BM

2

200

216

844

1

Control

stud

201

210

143

2

Lock

washer

1.5

202

218

318

1

Sleeve

203

210

143

2

Lock

washer

1.5

Pos.

Part.No.

Qty.

Description

204

210

472

2

Machine

screw

AM

3

x

4

205

234

798

1

Compression

spring

206

242

753

1

Lift

267

246

043

1

Lift

plate

208 246

044

1

Segment

209

218

591

1

Tension

spring

210

201

184

1

Adjustment

disc

211

238

192

1

Scating

lever

compl.

212

210

146

8

Lock

washer

3.2

213

225

176

1

Pivoting

cam

214

210

362

1

Hex

nut

215

242

764

1

Pawl

216

239 915

1

Square

plate

217

210

472

1

Machine

screw

AM

3

x

4

218

154

1

Tension

spring

219

242

747

1

Switch

lever

220 210

600

1

Washer

3.2/8/1

221

210

361

2

Hex

nut

230

209

424

1

5

pole

plug

231

207

303

1

Audio

cable

compl.

232

207

301

1

Audio

cable

compl.

with

cynch

plugs

233

209

436

3

Flat

connector

sleeve

234

209

425

1

Cynch

plug

white

235

209

426

1

Cynch

plug

black

236

214

602

2

AMP

plug

237

232

996

1

Power

cable

Europa

compl.

238

232

995

1

Power

cable

America

compl.

***

214

120

1

TA

mounting

Parts

***

244

347

1

Mounting

instruction

***

242

682

1

Operating

instruction

***

242

718

1

Shipping

carton

CS

***

244

312

1

Shipping

carton

Motorelectronic

C

1

220

766

4

Elyt

47

1./F/

25

V

C

2

224

597

1

Elyt

220

µF/

6

V

C

3

216 410

3

Elyt

470

1./F/

35V

C

4

216

410

3

Elyt

470

nF/

35

V/10

%

C

5

227

963

1

Ceramic

10

nF/

30

V/20

%

C

6

227

390

2

Ceramic

1

nF/

63

V/20

%

C

7

227

390

2

Ceramic

1

nF/

63

V/20

%

C

8

202

499

1

Foli

0.22

p.F/100

V/

5%

C

9

222

760

1

Ceramic

20

nF/

50V

C

10

216

410

3

Elyt

470

nF/

35

V/10

%

C

11

235

573

1

Elyt

10

µF/

16V

C

12

242

314

1

Elyt

0.68

µF/

35V

C

13

220

766

4

Elyt

47

biF/

25V

C

14

226

459

1

Foil

0.1

µF/100

V/

5%

D

1

227

360

1

ZPD

7.5

D

2

223

906

1

N

4148

R

1

224

603

3

1

MS2/0.25

W/5

%

R

2

211

202

4

10

k2/0.25

W/5%

R

3

224

735

1

68

k2/0.25

W/5

%

R

4

239

387

1

22

kg2

/0.25

W/5

%

R

5

224

603

3

1

MS2/0.25

W/5

%

R

6

241

342

1

82

kS2

/0.25

W/5

%

R

7

242

307

1

47

kS2

R

8

243

616

1

Potentiometer

10

kfl

R

9

243

617

1

Potentiometer

22

kS2

/lin.

R

10

245

531

1

24

kn

R

11

227

384

1

110

kS2/0.25

W/5%

R

12

228

265

1

270

kn/0.25

W/5%

R

13

239

395

1

15

k2/0.25

W/5%

R

14

224

590

1

220

k2/0.25

W/5%

R

15

211

202

4

10

k&2/0.25

W/5%

R

16

217

868

1

560

2/0.3

W/5%

R

17

239

367

1

47

kS2/0.25

W/5

%

R

18

242

311

1

2

2/25

W/5%

T

1

229

511

3

BC

172

B

T

2

229

511

3

BC

172

B

T

3

244

715

3

BC

238

C

T

4

242

306

1

BD

415

IC

1

242

303

1

NS

4069

IC

2

242

304

1

NS

555

17

***Not

illustrated

Modification

reserved!

Lubrication

Fig.

24

All

bearings

and

friction

points

are

adequately

lubricated

by

the

manufacturer.

Replenishment

of

oh

l

and

grease

is

only

necessary

after

approximately

2

years

of

normal

use

of

the

turntable

as

the

most

important

bearing

points

(motor

bearings)

have

sintered

metal

bushes.

Bearing

points

and

friction

faces

should

be

lubricated

sparingly

rather

than

generously.

When

using

different

lubricants,

chemical

decomposition

can

often

occur.

To

prevent

failure

of

lubrication

we

recommend

using

the

original

lubricants

stated

below.

Fig.

25

Wacker

Silicone

oll

AK

300

000

BP

Super

Viskostatik

10

W/40

Shell

Alvania

No.

2

Dual

Gebrüder

Steidinger

•

7742

St.

Georgen/Schwarzwald

920

506-2

5.2/0878

Printed

in

Germany

by

Dual

Dual 621 User manual

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