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3

,••••••"-

"VI

'mag.

Dual

Edition

April

1979

CS

731

Q

Service

Manual

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

b)

mit

Cynchstecker

/

with

phono

plug

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

gauche

canal

izquierdo

Neiß

/

white

/

blanc

/

blanc

Stummschaltrelais

Silent

switch

relay

Relais

-

conmutateur

silencieux

Relä

de

conmutacion

silenciosa

rechter

Kanal

right

channel

canal

droit

canal

derecho

rot

/

red

/

rouge

/

rojo

Masse

rechter

Kanal

Mass

right

channel

Masse

canal

droit

1

I I

I

I

I

I

I

mass

canal

derecho

grün

/green

/

vert

/

verdc

, I

I

i

I

I

Tonabnehmerkabel

Tonearm

audio

cable

Ca

ble

de

BF

Cable

del

fonocaptor

avec

fiche

cynch

/

con

enchufe

Cynch

rechter

Kanal

/

right

channel

---

Canal

droit

/

Canal

derecho

rot

(schwarz)

/

red

(black)

rouge

(noir)

/

rojo

(negro)

1

IM

R

E

I

1

I

L_I

1

I I

•

(

-

1

I

I

1

'

14

1

1

I

I

I I

Masse

draht

/

Mass

lead

Mass

cable

/

Mass

cable

1

Masse

rechter

Kanal

-

1

Mass

right

channel

Masse

canal

droit

mass

canal

derecho

Stummschal

trelais

Silent

switch

relay

Relais

-

conmutateur

silencieux

Relä

de

conmutacion

silenciosa

L

r -

1

•

•

f

i

1

.

l

inker

Kanal

1

left

channel

1

canal

gauche

canal

izquierdo

4

-weiß

/

white

/

blanc

/

blanco

L

_

I

Masse

linker

Kanal

1

Mass

left

channel

Masse

canal

gauche

mass

canal

izquierdo

1

blau

/blue

/

bleu

/azul

Masse

schwarz

Mass

black

Masse

noir

Masa

negro

z//z

z

/

/7

z

I

II

II

— -

4-

_

7

-linker

Kanal

/

left

channel

Canal

droit

/

Canal

izquierdo

I

gelb

(weiß)

/

yellow

(white)

.

jaune

(blanc)

/

amarillo

(blanco)

4.

1

Cynch-Tonabnehmerkabel

Pick

-up

lead

with

Cynch

plug

Ca

ble

de

BF

avec

fiche

Cynch

Cable

del

fonocaptor

con

enchufe

Cynch

I

—

Masse

linker

Kanal

Mass

left

channel

Masse

canal

gauche

mass

canal

izquierdo

0

Masseblech

Mass

sheet

Prise

de

masse

chapa

de

masa

Kontaktplatte

Contact

plate

Plaque

de

contacts

Placa

de

contacto

fi

r

I

1

I

I

1

I

1

I

I

1

1

I

I

1

1

i

I

I i

I

1

L.1

L

1

Kurzschließer

Muting

switch

Court-circuiteur

Dispositivo

cortocircuitador

/

/7/

/ / / /

I

II

I

I

Tonarmkopf

Tonearm

head

Täte

magnätique

Cabezal

fonocaptor

2

Contents

Page

2

3

4

5

5

6

6

6

6

6

6

6

7

7

7

7

8

8

8

8

8

8

8

9

9

9

9

9

10

10

10

10

10

10

11

11

11

11

11

11

11

12—

15

16

Technical

data

Current

type

Line

voltages

Drive

Power

consumption

Run

-up

time

Platter

Platter

speeds

Pitch

control

Speed

check

Sensitivity

of

light

stroboscope

for

0.3

%

speed

deviation

Wow

and

flutter

Signal-to-noise

ratio

Tonearm

Effective

tonearm

length

Offset

angle

Tangential

track

error

angle

Tonearm

bearing

friction

(related

to

stylus

point)

Tracking

force

Pick

-up

head

Cartridge

Weight

Tonearm

connection

diagram

Technical

data

Block

diagram

Direct

drive

system

EDS

920

Wiring

diagram

General

Fascia

Motor

and

drive

Replacing

motor

electronic

system

Replacing

motor

mechanical

system

Pitch

control

Stroboscope

Tonearm

and

tonearm

suspension

Fitting

a

1/2"

cartridge

Removal

of

tonearm

from

bearing

frame

Removal

of

complete

tonearm

Replacement

of

spring

housing

Adjustment

of

tonearm

suspension

Anti-skating

control

Tonearm

cue

control

Adjustment

point

Replacement

of

cue

control

plate

Tonearm

control

Continuous

play

Starting

Manual

start

Muting

Shut-off

End

of

play

shut-off

Adjustment

points

Power

fuse

Tonearm

set

down

point

Shut-off

point

Tonearm

lift

off

height

Pull

magnet

"start/stop"

Pull

magnet

"cueing"

Tonearm

does

not

set

down

Vertical

tonearm

movement

is

inhibited

Platter

does

not

rotate

Tonearm

does

not

set

down

on

edge

Motor

does

not

shut-off

Spare

parts

list

with

exploded

views

Lubrication

instructions

AC

50

or

60

Hz

110

—

125

V

and

220

—

240

V

Quartz

stabilized

electronic

direct

drive

system

Dual

EDS

920,

PLL

control

Approx.

4

W,

motor

during

play

<

50

mW

(until

nominal

speed

is

reached)

approx.

1.8s

at

33

rpm

Non-magnetic

dynamically

balanced,

complete

rotary

mass

detachable

approx.

1.5

kg

33

and

45

rpm,

electronically

switchable,

quartz

stabilized

In

PLL

technology,

quartz

accurate

for

both

speeds,

separately

adjustable,

range

of

adjustment

±

5.5

%

Quartz

accurate,

illuminated

stroboscope

with

automatic

frequency

switch-over

for

33

and

45

rpm

20

graduations

per

minute

DIN

<

±0.025

%

WRMS

<

±0.015

%

Rumble

unweighted

signal-to-noise

ratio

>

52

dB

Rumble

weighted

signal-to-noise

ratio

>

75

dB

Torsion-resistant

"ultra-low-mass"

aluminum

tonearm,

in

gimbal

4-point

suspension,

tonearm

balance

weight

with

tuning

anti-resonator

221

mm

26°

4'

0.16°

/cm

Vertical

<

0.07

mN

(0.007

g)

Horizontal

<

0.15

mN

(0.015

g)

From

0

—

20

mN

(0

-2

g)

infinitely

variable

with

1

mN

(0.1

g)

Calibration

in

range

from

2—

15

mN

10.2

-

1.5

g)

Detachable,

suitable

for

ultra-low-mass

cartridges,

with

long

carrier

plate

laccessory)

,

also

suitable

for

cartridges

with

Dual

shap-in

mounting

and

for

cartridges

with

1/2"

mounting

and

a

weight

of

2

to

9

g

(including

mounting

hardware)

Adjustable

overhang:

5

mm

See

separate

data

sheet

Approx.

8

kg

3

BLOCKSCHALTBILD

BLOCK

DIAGRAM

SCHEMA

SYNOPTIQUE

Motor

Motor

Moteur

Frequenz

-Generator

Frequency

generator

Gänärateur

de

fräquence

Motor

-Treiber

Motor

Driver

Moteur

Driver

Quarz-Oszillator

Quarz-oscillator

Oszillateur

Quartz

Amplituden

-Verstärker

Amplitude

Amplifier

Amplificateur

d'Amplitude

Sample-and

Hold

-Schaltung

Sample-and-hold

circuit

Circuit

de

contröle

avec

mise

en

memoire

Tonhöhen

-Regler

Pitch

Control

Räglage

finde

la

vitesse

Teiler

1

:

81

Divider

1

:

81

Diviseur

1

:

81

Schmitt-Trigger

Schmitt

Trigger

Schmitt

Trigger

Drehzahlumschalter

Speed

changeover

Commutateur

de

vitesse

Teiler

1

:

60

Divider

1

:

60

Diviseur

1

:

60

1

Teiler

1

:

512

Divider

1

:

512

Diviseur

1

:

512

Digital

-Analog

-Wandler

Digital

-Analog

converter

Convertisseur

digital-analogique

Amplituden

-Begrenzer

Amplitude

Limiter

Limiteur d'Amplitude

Teiler

1

:

512

Divider

1

:

512

Diviseur

1

:

512

PLL-Schaltung

PLL-Ci

cuit

Circuit-PLL

0

Tonhöhenschalter

Pitch

switch

Commutateur

räglage

de

la

vitesse

V

Impuls

-Former

Pulse

shaper

Modulateur

d'impulsion

Impuls

-Decoder

Pulse

Decoder

Däcodeur

ä

impulsion

Konstant

-Stromquelle

LED-Stroboskob

Constant

Cur

ent

Source

-

1111

0.-

LED-Strobe

Source

de

courant

constante

Stroboscope

ä

LED

Transformator

Transformer

Transformateur

Drehzahl

-Drift

-Erkennung

Speed

deviation

Identification

lndiquateur

variation

de

vitesse

Plus

-Minus

-Erkennung

Plus

-Minus

Identification

Identification

Plus

-Minus

Plus

-Minus

Anzeige

Plus

-Minus

indication

lndication

Plus

-Minus

Gleichrichter

Rectifier

Redresseur

Spannungs-Konstanthalter

Voltage

Stablizer

Rägulateur

de

tension

Digital

-Analog

-Umformer

Digital-Analog-Converter

Convertisseur

digital/analogique

Kaskadenschalter

Cascade

switch

Contacteur

ä

plots

13-Digit-Ska

a

13-Digit

Scale

Indicateur

ä

13

positions

EDS

920

direct

drive

system

The

newly

developed

direct

drive

system

of

the

CS

731

Q

turn-

table

is

a

successful

synthesis

of

our

well-known

motor

principle

and

a

highly

sensitive

electronic

system

which

receives

its

accu-

racy

from

a

quartz

crystal.

The

drive

motor

is

a

DC

motor

with

no

commutator

in

which

commutation

is

carried

out

by

two

Hall

generators

which

detect

the

position

of

the

rotor

equipped

with

an

8

-pole

ring

magnet

and

which

also

actuate

the

corresponding

windings

of

the

rigid

flat

coils.

The

synchronously

rotating

mag-

netic

return

circuit

plate

and

the

ring

magnet

enclose

with

a

small

air

gap

the

non-ferrous

coil

arrangement

so

that,

on

the

one

hand,

the

drive

system

displays

an

extremely

uniform

running

characteristic

without

pole

sensitivity

and

which

displays,

on

the

other

hand,

a

high

torque

in

spite

of

the

economical

energy

supply.

After

the

nominal

speed

has

been

attained,

the

energy

supply

required

for

maintenance

of

rotation

is

less

than

50

mW.

F

ig.

3

Description

of

function

At

a

motor

speed

of

33

1/3

rpm,

the

200

-pole

frequency

genera-

tor

rigidly

coupled

to

the

motor

delivers

a

frequency

of

111

Hz

which

is

amplified

in

the

input

amplifier

and

prepared

in

the

cam

form.

This

Signal

is

applied

as

an

actual

value

to

the

PLL

circuit.

An

oscillation

frequency

of

4.608

MHz,

which

is

control

led

by

a

highly

precise

quartz

crystal,

is

generated

in

the

quartz

oscillator.

The

actual

reference

frequency

—

that

is

to

say,

the

set

value

—

is

derived

from

the

oscillator

frequency

by

a

multi-stage

divider.

In

the

PLL

circuit,

the

actual

value

and

set

value

are

compared

with

one

another

as

regards

amount

and

phase.

In

the

case

of

the

slightest

deviation,

a

control

pulse

is

applied

to

the

digital/analog

converter

which

obtains

from

this

an

analog

control

signal

which

is

converted

into

a

current

alteration

in

the

subsequently

connec-

ted

motor

control

circuit.

In

the

drive

motor,

this

current

altera-

tion

causes

spontaneous

stabilization

of

the

minimal

speed

devia-

tion.

The

set

value

necessary

for

the

45

rpm

speed

is

generated

in

the

voltage

divider

by

alteration

of

the

divider

ratio.

For

pitch

control,

a

continuously

variable

control

signal

,

with

which

the

control

loop

is

fed,

is

obtained

by

means

of

a

complicated

division

pro-

cess.

Thus

the

complete

control

range,

like

the

nominal

speeds,

is

coupled

in

a

locked-phase

relation

to

the

quartz

oscillator.

The

speed

accuracy

in

the

pitch

range

is

practically

the

same

as

in

the

case

of

nominal

speed.

The

speed

deviation

preselected

with

both

pitch

controls

is

maintained

even

if

the

pitch

switch

is

operated

or

if

the

unit

is

seitched

off.

In

the

speed

logic,

the

display

unit

of

the

CS

731

0

obtains

from

the

actual

speed

the

basic

information

as

to

whether

the

actual

speed

of

the

nominal

speed

is

faster

or

slower.

A

further

logic

sy-

stem

activates

the

plus

or

minus

sign

of

the

display

unit.

Both

signals

are

dark

at

rated

speed.

From

the

digital

information

on

the

actual

speed,

a

further

digital/analog

converter

receives

relative

and

analog

information

which

is

transformed

in

the

cascade

switch

to

an

activation

voltage

for

the

13

digital

displays.

In

the

display

itself

the

information

is

still

completely

analog

as

the

individual

digits

are

activated

with

differentiated

voltages

and

light

up

accordingly.

This

display

is

as

accurate

as

it

is

practical.

The

power

section

supplies

the

various

partial

circuits

with

carefully

filtered

and

stable

operating

voltages.

General

The

listed

item

numbers

refer

to

the

following

spare

parts

lists

and

exploded

views.

The

cover

can

be

easily

withdrawn

from

the

hinged

splice

pieces.

To

remove

the

turntable,

remove

both

fillister

head

screws

(98)

and

the

discs

(86)

with

which

the

mounting

plate

(197)

isscrewed

down.

The

turntable

can

be

I

ifted

out

of

the

bracket

(12)

after

disengaging

the

three

transport

locking

screws.

Now

detach

the

following

plug

connections:

1)

Both

single

-pole

plugs

(122)

on

power

switch

(106).

2)

The

4

-pole

plug

(160)

on

the

solenoid

protective

circuit

(185).

31

The

5

-pole

female

multi-point

connector

(158)

at

the

display

unit

(35).

4)

The

5

-pole

female

multi-point

connector

(185)

at

the

distri-

butor

board

(24).

Fascia

To

dismantle

the

fascia,

remove

both

attachment

screws

(21)

with

which

the

display

unit

is

mounted

on

the

bracket

base.

bracket

base.

The

top

of

the

plate

(17)

is

attached

with

3

fillister

head

screws

(98)

and

three

washers

(86)

and

the

bottom

is

attached

with

three

cheesehead

screws

(501.

Fig.

4

Motor

and

drive

Special

tools

and

measuring

instruments

are

necessary

for

repair

of

the

Dual

EDS

920.

Therefore,

work

on

the

motor

or

the

motor

electronic

system

should

only

be

carried

out

by

an

authorized

Dual

service

station.

Replacement

of

the

motor

electronic

system,

complete

The

individual

modules

(151/152/153)

are

plugged

into

the

main

board.

In

addition,

they

are

held

by

means

of

supports

(154).

Moreover,

module

1

is

also

secured

with

the

fixing

screw

(159).

When

replacing

the

complete

motor

electronic

system,

proceed

as

follows:

1)

Remove

the

fillister

head

screws

(97)

and

the

four

supports

(154).

2)

Remove

fixing

screw

(159)

(module

1).

3)

Detach

the

plug

connections

fo

the

connection

cable

—

refer

to

wiring

diagram

Fig.

3.

4)

Detach

the

motor

electronic

system

completely

from

the

mechanical

system

of

the

motor

and

replace

it.

Replacement

of

the

mechanical

system

of

the

motor

1)

Release

both

threaded

pins

(19)

and

withdraw

plate

cone

(22).

2)

Remove

the

complete

motor

electronic

system

—

see

above.

The

plug

connections

of

the

connecting

cable

need

not

be

removed.

3)

Remove

both

fillister

head

screws

(99)

and

the

cog

(105).

4)

Withdraw

the

mechanical

system

of

the

motor

and

replace

it.

Fig.

5

Pitch

control

With

the

pitch

control,

each

of

the

two

rated

speeds,

33

1/3

and

45

rpm,

can

be

varied

by

±

5.5

%.

With

the

seesaw

switch

(16)

at

"ON"

position,

each

nominal

speed

can

be

altered

by

means

of

a

separate

potentiometer

(14).

At

the

same

time,

the

optoelectronic

display

scale

(35)

indicates

the

percentage

deviation

from

the

nominal

speed.

I

ndependently

of

the

potentiometer

setting

(14),

the

speed

cor-

responds

with

quartz

precision

to

the

respectively

switched

no-

minal

speed,

if

the

seesaw

switch

(16)

is

in

''OF

F"

Position.

Stroboscope

The

stroboscope

markings

on

the

turntable

edge

are

flashed

from

the

diode

plate

(148)

by

means

of

quartz

accurate

frequency.

The

display

is

independent

of

power

frequency

and

does

not

re-

quire

additional

stroboscope

markings

for

different

speeds

and

line

frequencies.

6

04.

4

When

the

stroboscope

markings

seem

to

be

stationary

both

no-

minal

speeds

(33

1/3

and

45

rpm)

are

accurately

adjusted.

If

the

markings

seem

to

run

ahead

the

speed

is

higher.

If

the

markings

seem

to

run

back

the

speed

is

lower

than

the

nominal

speed.

By

means

of

the

speed

of

the

apparently

"wandering"

markings

the

speed

selected

with

potentiometer

(14)

can

be

determined

at

high

speeds:

1

graduation/sec.

=

0.9

%

deviation.

After

releasing

the

fixing

screw

(159)

and

removing

both

fill

ister

head

cap

screws

(96)

the

stroboscope

housing

can

be

removed

(149).

After

re-

moving

the

retainer

piece

(147)

the

three

LED's

(148)

can

be

re-

placed.

Tonearm

and

tonearm

suspension

The

light,

torsion-resistant

all-metal

tonearm

is

twingimbal

mounted.

Suspension

is

by

means

of

four

hardened

and

precision

polished

steel

points

which

rest

in

precision

ball

bearings.

The

tonearm

bearing

friction

is

thus

reduced

to

a

minimum.

Bearing

friction

vertical

0.07

mN

(0.007

g)

Bearing

friction

horizontal

0.15

mN

10.015

g)

as

related

to

stylus

point.

This

ensures

extremely

favorable

pick

-up

conditions.

Before

setting

the

tracking

force

corresponding

to

the

built-in

pick

-up

cartridge

the

tonearm

is

balanced

at

0

position

of

the

tracking

force

scale.

Coarse

adjustment

is

carried

out

by

moving

the

weight

with

stem

(60)

subsequent

fine

adjustment

by

turning

the

front

knurled

ring

on

the

weight.

The

balance

weight

is

designed

so

that

pick

-up

cartridges

having

a

dead

weight

(including

fitting

material)

of

2

—

9

g

can

be

balanced.

The

tracking

force

is

produced

by

tensioning

the

coil

spring

fitted

in

the

spring

housing

(74).

The

rotary

knob

(69)

is

provided

with

a

scale

which

permits

accurate

adjustment

of

the

tracking

force

in

the

range

from

0

—

20

mN

(0

-

2

p)

by

means

of

the

merk

ing

dots.

Fitting

a

1/2"

cartridge

The

description

of

retrofitment

for

fitting

a

1/2"

cartridge

(re-

placement

of

carrier

plate

etc.)

should

be

taken

from

the

opera-

ting

instructions.

milm>"dal!iii11111111111111

Fig.

6

83

11

Removal

of

tonearm

from

bearing

frame

1)

Secure

unit

in

repair

jig.

Remove

weight

(60).

Unscrew

ten-

sioning

screw

(52).

Set

rotary

knob

(63)

to

0.

21

Turn

unit

upside

down.

Remove

hexagon

nut

(34)

and

screening

plate

(119).

Unsolder

tonearm

leads

on

muting

switch

(120).

31

Unscrew

tensioning

screw

(70).

Remove

rotary

knob

(691,

disc

(68)

and

indicator

(67).

4)

Loosen

locking

nut

(61)

and

unscrew

threaded

pin

(65).

51

Remove

tonearm

130)

with

bearing

(71).

Assembly

takes

place

in

reverse

order.

Removal

of

tonearm

assembly

with

tonearm

bearing

Proceed

as

follows:

1.

Secure

unit

in

repair

jig.

Set

rotary

knob

(69)

to

0.

Lock

tonearm

(30).

Remove

weight

1601.

2.

Turn

unit

upside

down.

Remove

hexagon

nut

and

screening

plate

(119).

Unsolder

tonearm

leads

on

muting

switch

(120).

3.

Remove

retainer

disc

1911.

Remove

main

lever

(167)

and

bearing

block

(166).

Remove

securing disc

(89).

Lift

off

ad-

justing

bar

(168)

and

rotary

bearing

(170)

and

swivel

to

motor.

1

141

187

96

168

190

167

176

97

4.

Disengage

tension

spring

(136).

Release

securing

disc

(90)

and

remove

skating

lever

(134).

5.

Remove

hexagon

nuts

(94).

Remove

countersunk

screw

(138).

Remove

counterbearing

(135)

and

segment

(124).

6.

Retain

tonearm

(30)

and

frame

(63).

Remove

filister

head

cap

screw

(88).

Remove

tonearm

complete

with

tonearm

bearing.

When

fitting

the

tonearm

proceed

in

reverse

order

but

ensure

that

the

threaded

pin

(62)

seats

correctly

on

ball

bearing.

Replacing

spring

housing

Remove

tonearm

(30)

from

bearing

frame

(66)

as

described

above.

When

installing

notice

that

the

helical

spring

engages

in

the

cut-

outs

of

the

bearing

(71).

Mount

tonearm

(30)

again.

Set

bearing

play

as

described

below

using

threaded

pin

(65)

a'nd

lock

nut

(61).

Adjusting

the

tonearm

bearing

First

balance

tonearm

accurately.

Both

bearings

must

have

slight,

just

perceptable

play.

The

horizontal

tonearm

bearing

iscorrectly

adjusted

when

at

anti-skating

setting

0.5

and

being

touched

it

slides

in

without

resistance.

The

vertical

tonearm

bearing

is

cor-

rectly

adjusted

when

it

swings

in

after

being

touched.

The

play

of

the

horizontal

tonearm

bearing

should

be

adjusted

with

thre-

aded

pin

(62),

the

play

of

the

vertical

tonearm

bearing

with

threaded

pin

(65).

A

nti-skat

ing

device

Adjustment

of

anti-skating

force

is

carried

out

by

means

of

turning

the

knurled

ring

on

the

cover.

According

to

adjustment

the

asymmetrical

cam

disc

guides

the

skating

lever

(134)

from

the

tonearm

pivot

point.

The

anti-skating

force

is

transmitted

to

the

segment

(124)

by

means

of

tension

spring

(136)

and

to

the

tonearm.

Optimum

adjustment

is

carried

out

at

the

works

for

styl

i

with

a

tip

radius

of

15

/im

(conical),

5/6

x

18/22

pm

(elliptical)

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

Dual

service

station.

Cue

control

By

moving

lever

(187)

forward

(

V)

lift

cam

(188)

rotates.

The

slide

bar

(168)

connected

to

it

transmits

this

movement

to

the

lift

pin

wh

ich

then

raises

the

tonearm.

As

a

result

the

cue

control

permits

set

down

and

lift

off

of

the

tonearm

at

any

desired

point

outside

the

shut-off

range.

The

slide

bar

(168)

is

released

again

by

moving

the

cue

control

lever

(187)

to

the

rear

(1).

As

a

resu

lt

of

the

action

of

compres-

sion

spring

the

lift

pin

is

returned

to

neutral

Position

and

thus

lowers

the

tonearm.

Lowering

of

the

tonearm

is

damped

by

silicone

oil

in

the

lift

tube.

The

set

down

speed

can

be

varied

by

adjusting

the

pretension

of

compression

spring

(lift

plate

176).

Accord

ing

to

Operation

of

the

adjusting

ring

(82)

in

position

"4"

the

lowering

speed

is

slower,

in

Position

"441"

it

is

faster.

Adjustment

point

The

lift

height

can

be

varied

by

turning

adjusting

screw

(51).

The

distance

between

record

and

stylus

should

be

approximately

5

mm.

Fig.

8

63

66

65

61

71

81

88

124

94

n

emeee...2

_

r

•

'

,

•

I

61

62

74

69

70

82

83

138

Replacement

of

cue

control

plate

Replace

cue

control

plate

as

follows:

1.

Fix

unit

on

repair

jig

and

lock

tonearm.

Turn

unit

upside

down.

2.

Remove

securing

disc

(89).

Detach

main

lever

(167)

and

bearing

block

(166).

3.

Remove

securing

disc

(89).

Rernove

adjusting

bar

(168)

and

rotary

bearing

(170)

and

swivel

to

motor.

4.

Remove

both

fil

ister

head

cap

screws

(971,

remove

cue

control

plate

complete

(176).

Fitment

takes

place

in

reverse

order.

lt

should,

however,

be

noted

that

the

pressure

piece

in

the

cue

control

plate

(176)

engages

correctly

in

adjusting

ring

(82)

(varying

the

lowering

speed.

Fig.

9

To

nearm

control

Automatic

movement

of

the

tonearm

is

indicated

by

the

control

cams

on

the

inside

of

the

cam

wheel

(16)

on

rotating

through

360

0

.

The

control

elements

for

raising

and

lowering

are

the

control

lever

(167)

and

the

lift

pin,

for

horizontal

movement

of

the

tonearm

control

lever

(167)

with

segment

(124).

8

4

The

automatic

set

down

point

is

designed

for

30

cm

and

17

cm

records

and

is

coupled

to

the

platter

speed

changeover.

Set

down

points

of

the

tonearm

are

determined

by

means

of

stop

of

spring

bolt

of

segment

(124)

at

the

adjusting

bar

(168).

Limitation

of

the

horizontal

movement

of

the

tonearm

is

produced

by

stop

of

segment

on

adjusting

bar

(168)

which

is

I

ifted

off

only

during

set

down

by

the

main

lever

(167)

and

reaches

the

swivel

range

of

the

spring

bolt

on

the

segment.

On

completion

of

set

down

(lowe-

ring

of

the

tonearm

onto

the

record)

slide

bar

(168)

is

released

again

and

returns

to

its

neutral

position.

As

a

result,

this

is

out-

side

the

range

of

the

spring

bolt

so

that

unimpeded

horizontal

movement

of

the

tonearm

is

possible

for

playing.

Continuous

automatic

play

The

continuous

automatic

play

is

operated

by

turning

knob

(84)

to

"00".

Switch

bracket

(179)

is

actuated

by

knob

(84).

Switch

rod

(180)

keeps

change

lever

(165)

in

start

position.

After

playing

the

record

the

tonearm

returns

automatically

to

the

lead

in

groove

of

the

record.

This

process

will

be

repeated

until

knob

(84)

is

in

position

"1".

Adjustment

point

Withdraw

power

plug.

Remove

turntable

(3).

Bring

knob

(84)

to

position

"oo".

Turn

cam

wheel

to

center

position.

The

change-

over

lever

deflects

the

cam

follower

lever

(U).

By

this

means

the

cam

follower

lever

tip

must

be

brought

at

least

to

the

cam

track

center.

Adjustment

by

bending

the

switch

rod

(189).

Starting

Operation

of

push-button

(59)

"start"

results

in

the

following

functions:

a)

The

right

hand

pull

magnet

(142)

operates

cam

followerlever

(165).

At

the

same

time

the

power

switch

(106)

is

operated

by

the

contact

arm

(127)

coupled

to

the

switching

arm

(78)

and

the

motor

and

turntable

start

to

rotate.

b)

This

Operation

also

releases

start

slide

(39)

which

is

drawn

in

the

direction

of

the

cam

wheel

by

means

of

the

tension

spring

(38).

By

this

means

the

shut-off

lever

(8)

on

the

cam

wheel

(25)

is

brought

into

the

range

of

the

follower

(M)

(plate

cone

22)

and

the

cam

wheel

driven

by

this

means.

Manual

start

The

detent

(126)

coupled

to

control

arm

(78)

engages

in

the

square

plate

(125)

when

the

tonearm

is

moved

inward

by

hand

and

retains

the

tonearm

in

this

position.

The

power

switch

is

operated

by

the

control

arm

and

thus

the

motor

and

platter

start

to

rotate.

After

reaching

the

run-out

groove

of

the

played

record

return

of

the

tonearm

and

shut-off

of

the

unit

take

place

automatically.

lf,

on

the

other

hand

the

tonearm

is

lifted

off

the

record

before

playing

is

completed

and

moved

onto

the

rest

by

hand,

the

pin

of

segment

(124)

disengages

the

detent

(126)

so

that

the

control

arm

is

returned

to

its

starting

position.

As

a

result,

the

power

switch

shuts

off

the

power

supply.

M

uting

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

cam

wheel.

With

the

unit

in

neutral

state

the

short-circuit

of

the

pick

-up

leads

is

eliminated.

Adjustment

point

In

neutral

position

of

the

cam

wheel

a

contact

distance

of

ap-

proximately

0.5

mm

should

be

present

between

contact

springs

(F)

and

short-circuit

strips

(L).

If

necessary

bend

short-circuit

strips.

Spray

contact

springs

with

suitable

means.

Fig.

10

Fig.

11

Fig.

12

Stopping

When

push-button

(59)

"stop"

is

operated

the

changeover

lever

(165)

is

brought

into

stop

position

by

means

of

the

left

hand

pull

magnets

(142).

As

a

result

the

start

slide

is

released

which

is

drawn

in

the

direction

of

the

cam

wheel

by

means

of

tension

spring

(38).

By

this

means

the

shut-off

lever

is

brought

into

the

range

of

the

follower

on

the

platter

pinion

(PR)

and

the

cam

wheel

(25)

is

thus

driven.

9

Shut-off

Operation

The

functions

of

end

switch-off

and

stop

switch

ing

are

determi-

ned

by

the

position

of

the

deflection

lever

(U).

The

deflection

lever

(U)

is

brought

to

stop

position

by

the

main

lever

(167)

after

every

start

Operation

(longer

end

of

deflection

lever

to

cam

wheel

center).

After

playing

of

a

record

shut-off

is

initiated

by

the

follower

(M)

of

the

platter

(3)

and

the

shut-off

lever

(A).

The

shut-off

bar

(128)

is

only

moved

synchronously

by

the

bolts

of

the

segment

(126)

in

the

shut-off

range.

In

the

shut-off

range

Irecords

116

to

122

mm

1;b1

the

shut-off

lever

(A)

is

guided

onto

the

follower

(Fig.

13

a)

by

the

shut-off

bar

(128).

The

follower

(M)

engages

shut-off

lever

(A).

By

this

means

cam

wheel

(25)

is

brought

out

of

zero

position

in

engage-

ment

with

pinion

of

platter

(Fig.

13

b).

The

main

lever

(167)

guides

the

tonearm

back

and

effects

tonearm

lowering

onto

the

support.

During

run-in

of

the

cam

wheel

into

zero

position

the

roller

(76)

of

the

switching

arm

(78)

run-in

to

the

cut-out

provided

on

the

cam

wheel

and

operate

the

power

switch

(106).

Adjustment

points

Power

fuse

After

removing

both

fastening

screws

and

detaching

power

secti-

on

cover

the

fuse

(102)

on

the

power

plate

(101)

can

be

replaced.

Tonearm

set

down

point

The

set

down

point

of

the

tonearm

can

be

altered

with

the

ec-

centric

bolt

(172).

If

the

stylus

sets

down

too

far

in

or

out

on

the

record

turn

the

eccentric

bolt

(172)

correspondingly

right

or

left.

Shut-off

point

The

shut-off

point

(shut-off

range

records

116

—

122

mm

95)

can

be

altered

with

the

eccentric

(E)

on

the

segment

(124).

Tonearm

lift-off

height

The

tonearm

lift-off

height

(during

automatic

operation)

can

be

altered

with

adjusting

sleeve

(177).

Withdraw

power

plug.

Un-

lock

tonearm.

Rotate

cam

wheel

(25)

out

of

zero

position

until

tonearm

has

reached

its

highest

point.

The

tonearm

should

be

approximately

5

mm

above

the

tonearm

support

stop

(Fig.

16).

If

necessary,

Turn

adjusting

sleeve

(177)

to

left

or

right.

Fig.

13

22

A

25

128

b.)

Fig.

14

Fig.

15

Fig.

16

10