Dual 601 User manual

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'issw

Dual

Edition

August

1975

601

Service

Manual

Dual

Gebrüder

Steidinger

•

7742

St.

GeorgenISchwarzwald

Download from www.dual.de

Not for commerical use

Fig.

1

Pick

-up

Connection

Diagram

earir

point

arm

E

catec

.

Rep

I

anc

necee

ximat

rmal

d

plE

impot

s

(mc

sintE

s.

ng

Pc

ion

1

bricE

ther

sly.

impr

1

or

in

c(

rict:

lat

t

y

an(

,

otf

occul

usin!

cant(

posii

ake

nt

11

re

ui

the

cant:

The

•

cant:

for

:

cati:

BP

5.

st

at

Shel

No.

Isof

Sili

AK

E

right

channel

' 1

--

-I

r

----

1

-

•

I

1----,

red

1

- -

,

1 1

"1

1 1

\

,,

I

--

_

---1

I

4.----

e

-4

i

,

!

Short

circuiter

Q1 n

r`i

n

0

2

1

r

1

----------7

-

1-_

i

7

-

1

7'1

Mass

sheet

0

Contact

plateat

tonearm

head

Record

1

right

channel

red

Mass

right

channel

green

01

r

--

Cartrid

g

e-holder

_

red

1

green

__---r

-

Cartridge

11

-

r

1 -

II

1

J

L

black

left

channel

white

Mass

left

channel

blue

-

left

channel

—

1

-

I

i

I

—

—)

--

I

1

-1

--

1

I

white

mi,

j---1

-_-

I<.

—

...

}---1

...

L I , !

•-•,...i

`:—

Tonearm

audio

cable

1,

al

with

miniature

plug

5-pin

right

channel

red

lead

left

channel

white

lead

black

lred)

white

blue

inner

side

of

groove

2

outer

side

of

groove

left

channel

right

channel

b)

with

phono

plug

Tonearm

head

Spring

contacts

between

plug-in

cartridge

head

and

tonearm

white

(yellowl

5-2

2/875

2

Contents

Page

Pick

-up

Connection

Diagram

2

Specification

3

Motor

and

Drive

4

Replacement

of

Motor

Pulley

4

Stroboscope

5

Pitch

Control

6

Nominal

speed

is

at

the

edge

of

the

control

range

of

the

pitch/control

6

Platter

does

not

run

when

unit

is

connected

to

power

line

and

start

switch

operated

6

Platter

does

not

reach

required

speed

6

Pick

-up

head

not

parallel

to

platter

6

Tonearm

and

Tonearm

Bearing

7

Anti-skating

Device

8

Stylus

skips

8

Vertical

tonearm

movement

shows

resistance

during

set

down

8

Tonearm

Control

9

Cue

Control

9

Replacement

of

Lift

Tube

10

Tonearm

does

not

set

down

at

the

edge

of

the

record

10

Tonearm

does

not

set

down

on

record

after

operating

cue

control

10

Tonearm

lowers

onto

record

too

quickly

when

cue

control

is

operated

10

Tonearm

returns

to

rest

after

manual

set

down

immediately

after

the

platter

starts

to

turn

Starting

11

Manual

Start

11

Short

Circuiter

11

Continuous

play

11

Stopping

12

Shut-off

12

Platter

remains

stationary

after

automatic

set-down

of

tonearm

on

record

12

Tonearm

remains

suspended

just

outside

the

17.5

cm

record

after

adjustment

of

the

tonearm

set-down

point

for

30

cm

records

13

Tonearm

is

hindered

in

its

horizontal

motion

during

automatic

Operation

13

Tonearm

moves

with

tracking

force

and

anti-skating

scale

in

0

position

13

During

automatic

operation

of

tonearm

disturbing

noises

are

perceptible

13

No

reproduction

13

Motor

does

not

shut

off

when

tonearm

sets

down

on

rest

13

Acoustic

Feedback

1.3

Spare

parts

with

Exploded

drawings

14

-

19

Lubricating

Instructions

20

Specification

Current

Type

AC

50,60

Hz,

selected

by

exchanging

drive

pulley

Line

Voltages

110—

130

volts,

220

—

240

volts

Motor

and

Drive

8-pole/synchronous

motor

with

belt

drive

system

Power

Consumption

approx.

10

watts

Current

Consumption

with

220V

50

Hz

approx.

72

mA

with

110

V

60

Hz

approx.

135

mA

Platter

Non-magnetic,

dynamically-balanced,

detachable,

1,3

kg,

305

mm

dia

Platter

Speeds

33

1/3

and

45

rpm,

automatic

tonearm

lowering

coupled

to

speed

change

Pitch

Control

Range

of

adjustment

approx.

1

semitone

(6

%)

at

both

platter

speeds

Speed

Check

with

light

stroboscope

for

platter

speeds

of

33

1/3,

adjustable

for

50

or

60

Hz

Overall

Speed

Variation

(assessed

in

accordance

with

DIN

45

507)

<

±

0.08

Signal-to-Noise

Ratio

Rumble

weighted

signal-to-noise

ratio

>63

dB

Rumble

unweighted

signal-to-noise

ratio

>42

dB

(in

accordance

with

DIN

45

500)

Tonearm

Torsion

resistant,

tubular

aluminum

tonearm

in

universal

four-point

gimbal

suspension

Tonearm

Bearing

Friction

vertical

<0.007

p

(related

to

stylus

point)

horizontal

<0.015

p

Pick

-up

Head

Detachable,

suitable

tor

all

pick

-up

cartridges

with

Dual

catch

mounting

and

1/2"

mounting

and

a

deadweight

of

2—

10

g

(including

mounting

material)

Tracking

Force

0

—3

p

continuously

variable,

with

1/10

p

calibration

in

the

range

from

0

—

1.5

p,

reliable

as

from

0.25

p

tracking

force

Weight

approx.

5.3

kg

For

dimensions

and

cutout

refer

to

Installation

lnstructions

3

Fig.

2

Motor

and

Drive

102

12

10

127

1111

11

129

111

6

33

34

9

1:

Il

_

JerliWirr

y

j

a

mia

d

MeEff4

m

ll

mräum£4

1

4

,

-

1'

Fig.

3

Fig.

4

Motor

and

Drive

The

turntable

platter

and

the

changing

me—

chanism

are

driven

by

an

eight—pole,

syn—

chronous

motor

suspended

by

radially

loca—

ted

elastic

mounts

and

having

a

very

small

stray

magnetic

field

as

well

as

little

Vi—

bration.

The

speed

of

the

motor

is

a

function

of

line

voltage,

temperature

and

load

variations.

Speed

is

dependent

on

and

proportional

to

line

frequency.

The

motor

is

adapted

to

50

or

60

Hz

power

line

frequencies

by

the

correct

choice

of

motor

pulley.

Pulley

for

50

Hz

Part.—No.

224

453

ISulley

for

60

Hz

Part.—No.

234

454

The

motor

pulley

(129)

is

secured

to

the

motor

shaft

by

two

set

screws

(130).

The

drive

is

linked

to

a

flywheel

rotor

be—

neath

the

platter

by

a

precision—graund

belt

(34).

When

replacing

the

flat

belt

(34)

be

eure

that

the

precision—ground

surface

of

the

belt

(dull

finish)

closely

contacts

pulley

(129)

and

the

flywheel

rotor.

Platter

speeds

of

33

1/3

and

45

rpm

are

ad—

justed

by

linking

the

flat

belt

(34)

to

the

corresponding

step

of

the

drive

pulley

(129)

(Fig.

3).

Corresponding

to

the

actuation

of

the

speed

selector

(12)

the

changeover

layer

is

brought

to

the

appropriate

position

of

no—

minal

speeds

(33

or

45

rpm)

via

lauer

(101)

and

spring

lever.

When

the

unit

is

electri—

cally

shut

off

the

changeover

lever

is

blocked

by

locking

bar

(9).

Consequently,

the

speed

is

only

preselected.

After

switching

on

the

unit

and

turning

the

plat—

ter

(4)

the

pawl

(9)

disengages

the

changeover

layer,

thus

guiding

the

Fiat

belt

to

appropriate

step

of

the

pulley

(129)

Reacenment

of

Motor

Pulkyir

1.

Remove

flat

belt

(34)

from

motor

pulley

(129)

toothed

belt

from

toothed

belt

pulley

II

(104).

2.

Disengage

tension

spring

(112)

at

shield

(116).

3.

Undo

adjusting

nut

(108).

4.

Pull—off

the

conter

bearing

assembly

con—

sisting

of

the

conter

bearing,

toothed

belt

pulley

(110),

stop

disk

(109)

and

toothed

belt

(127).

Aftention:

Do

not

remove

stop

disk

(109)

from

toothed

belt

pulley

I.

For

correct

ad—

justment

of

stop

disk

proceed

as

follows:

Turn

toothed

belt

pulley

I

(110)

with

toothed

belt

(34)

conterclockwise

until

it

stops

at

the

counter

bearing

(116).

Then

turn

quarter

to

half

turn

clockwise

Place

stop

disk

(109)

such

that

the

nose

(N)

touches

the

stop

as

shown

in

Fig.

2.

5.

Loosen

set

screws

(130

a

and

130

b)

and

remove

motor

pulley

(129).

6.

Place

complete

replacement

motor

pulley

on

motor

axle.

Remove

conical

sleeve.

Be

careful

with

the

interior

distance

bush—

ing.

Adjust

motor

pulley

vertically

(see

Fig.

1)

and

tighten

set

screws

(130

a

and

130

b)

uniformly.

Place

conical

sleeve

into

the

motor

pulley

(129).

7.

Mount

the

complete

bearing

assembly,

and

attach

Fiat

belt

(34),

toothed

belt

(127)

and

tension

spring.

Mount

adjusting

nut

(10B).

4

•

8.

Setting

of

nominal

speed

To

bring

stop

disk

into

center

position

turn

adjustment

knob

correspondingly.

(The

nose

of

the

stop

disk

should

show

to

the

motor

pulley

center).

Adjust

nominal

speed

by

turning

adjusting

nut

(108)

counterclockwise

the

speed

is

reduced.

When

turning

lt

clockwise

the

speed

is

increased.

St

roboscope

Accurate

setting

of

the

platter

speed

33

1/3

rpm

can

be

checked

during

play

with

the

aid

of

the

stroboscope

device.

When

the

platter

(4)

is

rotating

at

exactly

33

1/3

rpm

the

lines

of

the

stroboscope

ap—

pear

to

stand

still.

If

the

lines

of

the

stroboscope

move

in

the

direction

of

rota—

tion

of

the

platter,

the

platter

speed

is

too

high.

If

the

lines

move

backwards,

the

platter

is

rotating

more

slowly

than

the

no—

minal

speed.

Adjustment

is

carried

out

with

the

"pitch"

knob

(10).

To

change

the

stroboscope

slacken

machine

screws

(241),

move

stroboscope

housing

(243)

to

"50"

or

"60"

(Hz)

and

retighten

screws.

After

removing

the

housing

top

(238)

the

glow

lamp

(239)

can

be

changed.

In

the

case

of

glowlamps

with

red

spot

ensure

that

the

red

spot

(anode)

faces

the

C

1

capacitor.

tor.

Defeet

After

switching

the

unit

on

the

glow

lamp

(239)

of

the

stroboscope

does

not

come

on.

•

Cause

a)

Clou

lamp

(239)

defective

b)

Power

supply

interrupted

Remedy

a)

Renew

glow

lamp

(239).

In

the

case

of

glow

lamps

with

red

spot,

ensure

that

the

red

spot

(anode)

faces

the

C

1

capacitor.

b)

Check

connections

at

power

pack,

check

components.

Fig.

7

Motor

field

connections

(with

voltage

selector)

110-125V

220-240V

Fig.

5

Fig.

6

Fig.

8

Stroboscope

(wiring

diagram)

Circuit

board

(output

stages)

5

Fig.

9

104

12

10

127

107

109

108

125

Defect

Nominal

speed

is

at

the

edge

of

the

con—

trol

range

of

the

pitch

control.

Platter

does

not

run

after

the

line

volta—

ge

cord

of

the

unit

has

been

plugged

in

—

to

the

receptacle

and

the

master

operating

switch

moved

to

"start".

Platter

does

not

come

up

to

its

required

speed.

Fig.

10

111

Cause

Position

of

toothed

belt

pulley

inac—

curate.

a)

Power

supply

to

motor

interrupted

b)

Drive

pulley

slackened

a)

Drive

pulley

is

not

correct

for

local

line

fre—

quency

b)

Slippage

between

flat

belt

and

drive

pulley

or

between

flat

belt

and

flywheel

ro—

tor

Excessive

fric—

tion

in

motor

bearing

or

fly—

wheel

rotor

bear—

ing

assembly

(161)

)

Pitch

Cont

rol

The

unit

has

a

separately

adjustable

pitch

control

by

which

the

two

standard

speeds

33

1/3

and

45

rpm

can

be

varied

by

ap—

proximately

6

%

(1

semitone).

By

turning

the

fine

speed

adjustment

knob

(10)

the

toothed

belt

(Fig.

7)

thus

moving

the

counter

bearing

(111)

upwards

or

down

—

werde.

The

taper

bush

of

the

drive

pulley

(129)

is

designed to

vary

the

diameter

of

the

drive

pulley

(129)

thus

varying

the

no—

minal

speed

within

the

tolerance

of

+

3

%.

Remedy

By

turning

fine

speed

adjustment

knob

(10)

move

stop

disk

(109)

to

its

center

position

(The

dog

of

the

stop

disk

should

face

the

center

of

the

drive

pulley).

Using

adjusting

nut

(108)

adjust

for

nominal

speed.

The

nominal

speed

is

increased

by

turning

the

adjusting

nut

(108)

clockwise

and

decreased

by

turning

the

set

screw

counterclockwise.

a)

Check

connection

at

switch

plate

and

power

supply

plug.

b)

Retighten

drive

pulley

a)

Renew

drive

pulley

b)

Clean

friction

surfaces

of

flat

belt,

drive

pulley

and

flywheel

rotor.

Renew

flat

belt

if

neccessary.

Once

the

fly—

wheel

rotor

has

been

cleaned

do

not

touch

it

with

your

fingers.

c)

Clean

and

oil

bearings

Ddect

Pick

—up

head

not

parallel

to

platter.

Cause

The

pick

—up

head

has

been

moved

out

of

po—

sition

on

the

tonearm

tube

during

transport.

Remedy

Remove

platter.

Using

a

screwdriver

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

(Fig.

10).

6

•

Tonearm

and

Tonearm

Bearing

The

Dual

601

has

a

feather—light,

extremely

torsion—resistant

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

bell

bearings.

Tonearm

bearing

friction

is

thus

reduced

to

a

minimum.

Bearing

friction

vertical

g

0.007

Bearing

friction

horizontal

g

0.015

stylus

point

As

a

result,

lt

ensures

extremely

favourable

pick

—up

conditions.

The

pick

—up

head

is

re—

movable.

Before

adjusting

the

pick

—up

force

to

suit

the

built—in

pick

—up

cartridge

the

tonearm

is

balanced

with

the

scale

set

to

0.

Coarse

adjustment

is

carried

out

by

moving

the

counterweight

(52)

with

stem

(51),

the

subsequent

fine

adjustment

by

turning

the

weight.

The

balance

weight

is

designed

so

that

pick

—

up

cartridges

with

a

deadweight

of

2

—

10

g

can

be

balanced.

For

the

absorption

of

Vi-

bration

and

rapid

small

shocks,

the

counter—

weight

is

flexibly

connected

to

its

threaded

stem

and

arrested

to

prevent

unintentional

rotation.

The

pick

—up

head

is

suitable

for

accommodating

all

pick

—up

cartridges

whose

type

of

mounting

conforms

With

the

interna—

tional

standard

1/2

inch

mounting

and

whose

deadweight

does

not

exceed

10

g.

The

treck—

ing

force

is

adjusted

by

turning

the

gradu—

ated

spring

housing

(59)

and

thus

tensioning

or

releasing

the

coil

spring

mounted

inside.

To

change

the

tonearm

complete

with

tonearm

suspension

we

recommend

preceeding

as

fol—

lows:

1.

Secure

unit

in

repair

jig

and

arrest

tonearm.

2.

Move

unit

into

head

position

and

unsol—

der

tonearm

leads.

3.

Remove

main

lever

(154)

and

compression

spring

(180).

4.

Disengage

tension

spring

(260),

undo

washer

(268)

and

remove

skating

lever

(265).

Be

careful

with

compression

spring

(267)

as

lt

may

drop

out.

5.

After

removing

washer

(264)

and

sliding

washer

(263)

detach

shut—off

bar

(262)

from

segment

(258).

6.

Undo

hexa9on

nut

(259)

and

pull

off

seg—

ment

(258).

7.

Remove

hexagon

nut

(217)

and

washer

(67),

then

with

draw

tonearm

complete

with

sus—

pension.

When

inserting

the

tonearm

complete

with

suspension

proceed

in

reverse

order.

To

remove

the

tonearm

from

the

bearing

race

the

tracking

force

scale

should

first

be

set

to

zero

position

after

unsoldering

the

tonearm

leads.

Unscrew

locknut

(60)

with

grub

screw

(51)

and

mounting

screw

(65).

Carefully

withdraw

tonearm

from

the

bearing

race.

For

adjusting

the

tonearm

head,

a

hole

is

provided

in

the

chassis

to

make

this

possible

without

first

removing

the

tonearm.

Adjustmentc4lbnearniEleahng

Both

bearings

must

haue

slight,

just

per—

ceptible

play.

Adjustment

of

the

vertical

bearing

should

only

be

carried

out

by

means

of

the

left

mounting

screw

(grub

screw

61),

that

of

the

horizontal

bearing

by

means

of

grub

screw

(36).

The

horizontal

tonearm

bearing

is

correctly

adjusted

when

at

antiskating

setting

"0.5"

(tonearm

pre—

viously

balanced

exactly)

the

tonearm

slides

in

without

resistance.

Fig.

11

Tonearm

bearing

assembly

66

60

61

37

211

44

258

Fig.

12

Tonearm

bearing

assembly

(view

from

underneath)

35

36

54

65

59

52

55

62

265

259

256

262

154

149

150

Fig.

13

Anti—skating

force

Anti-Skating

Device

a)

Anti-skating

force

0-set-

ting.

No

compensation

of

the

skating

force

ta-

kes

place

as

a

result

of

the

action

of

the

tension

spring

(260)

at

the

fuc-

rum

of

the

tonearm.

b)

Anti-skating

mechanism

set

to

"1.5"

on

the

scale

for

elliptical

styli.

Tone

-

arm

on

tonearm

rest.

The

tension

spring

(260)

produces

the

anti-skating

force

which

is

transmit-

ted

to

the

tonearm

via

the

segment

(258).

The

compression

spring

•

presses

the

skating

lever

(265)

against

the

plate

cam

(225).

c)

As

"b"

but

tonearm

abo-

ve

platter.

Ddect

Stylus

slips

out

of

playing

groove

Vertical

tonearm

mo—

vement

shows

resi—

stance

during

set—

down

267

265

260

258

225

Cause

a)

Tonearm

is

not

ba—

lanced

b)

Tonearm

tracking

force

is

too

lau

c)

Anti—skating

set—

ting incorrect

d)

Stylus

tip

worn

or

chipped

a)

Excessive

bearing

friction in

tone

—

arm

bearing

Steel

ball

(221)

of

shut—off

bar

missing

a)

Bearing

friction

excessive

b)

Lift

(216)

sticks in

guide

tube

The

geometrical

skating

force

acting

on

every

tonearm

is

eliminated

on

the

Dual

601

by

means

of

a

precision

anti—skating

device.

The

skating

force

is

dependent

on

the

geo—

metry

of

the

tonearm,

on

the

tracking

force

and

on

the

tip

curvature

of

the

stylus of

the

pick

—up

cartridge.

The

pull

on

the

tone

—

arm

to

the

center

of

the

platter

caused

by

the

skating

effect

leads

not

only

to

trou—

blesome

jumping

of

the

tonearm

when

lowered

manually

or

automatically,

but

also

the

un—

even

flank

loading

of

the

sound

groove

with

the

resultant effects

which

have

to

be

eli—

minated

on

a

hifi

record

player

with

the

aid

of

the

anti—skating

device.

Turning

the

knob

(69)

of

the

anti—skating

device

on

the

mounting

plate

moves

the

asym—

metrical plate

cam

(225).

This

plate

cam

has

two

different

curves

which,

according

to

use

of

the

red

anti—skating

scale

for

the

dif—

ferent

styli

as

well

for

CD

4

pick

—up

car—

tridges

move

the

skating

lever

(265)

from

its neutral position

and

transmit

the

coun—

ter

force

to

the

tonearm

by

means

of

tension

spring

(260).

Optimum

adjustment

is

carried

out

at

the

works

for styli

with

a

tip

radius

of

15

+

2

µm

(conical)

and

5/6

x

18/22

µm

(ellip—

tical)

as

well

as

for

CD

4

pick

—up

car—

tridges.

The

hexagon

nut

(226)

is

tightened

and

locked

with

paint. Alteration

can

only

be

carried

out

with

the

aid

of

the

Dual

Skate

—O

—Meter

and

test

record

L

096

and

should

only

be

done

by

an

authorised

ser—

vice

station.

Remedy

a)

Balance

tonearm

b)

Check

tonearm

balance,

adjust

tracking

force

to

the

value

stated

by

the

car—

tridge

manufacturar

c)

Correct

anti—skating

setting

d)

Renew

stylus

e)

Check

tonearm

bearings.

Both

bearings

must

have

slight, just

perceptible

play.

The

adjustment

of

the

vertical

bearing

should

only

be

carried

out

with

the

left—

hand

bearing

screw

(grub

screw

61),

that

of

the

horizontal

bearing

by

means

of

grub

screw

(36).

The

horizontal

bearing

is correctly

adjusted

when

at

anti—skat—

ing

setting "0.5"

(onearm

previously

balanced

exactly)

the

tonearm

slides

in

withoutresistance.

f)

Renew

steel ball

(221)

a)

Eliminate

friction

by

adjusting

the

bea—

ring

screw

(grub

screw

36)

and

check

ba—

lance

b)

Remove

lift

tube

assembly

as

described

on

page

10

.

Remove

guide

(210)

on

lift

(216).

Remove

lockwasher

(212),

de—

tach

adjuster

sleeve

(211)

and

remove

second

lockwasher

(212).

Withdraw

lift

evenly

with

"Wacker

Silicone

Oil

AK

500

000".

Reassemble

components.

8

Tonearm

Control

Fig.

14

Tonearm

guide

mechanism

•

Automatic

movement

of

the

tonearm

is

initi—

ated

by

the

control

cams

an

the

inside

of

the

cam

wheel

(144)

an

rotating

through

360

°

.

The

control

elements

for

raising

and

lower—

ing

are

the

control

lever

(154)

and

lift

(216),

for

horizontal

movement

of

the

tone

—

arm

control

lever

(154)

with

segment

(258).

The

automatic

tonearm

set

down

is

designed

for

30

cm

and

17

cm

records

and

is

coupled

to

the

platter

speed

changeover.

The

set—

down

points

of

the

tonearm

are

determined

by

the

spring

of

segment

(258)

contac—

ting

the

positioning

slide

(256).

Limita—

tion

of

the

horizontal

movement

of

the

tonearm

is

produced

by

the

of

segment

contacting

the

stop

attached

to

the

slide

bar

(256).

Only

during

set—down

does

con—

trol

lever

(154)

lift

the

slide

bar

(256)

and

the

stop

attached

to

lt

which,

as

a

result,

moves

into

the

swivel

range

of

the

stop

fitted

an

the

segment.

After

com—

pletion

of

set

down

(lowering

of

the

tone

—

arm

onto

the

record)

the

slide

bar

(256))

is

released

again

and

returns

to

neutral

position.

As

a

result

the

stop

moves

out

of

the

swivel

range

of

the

stop

so

that

unimpeded

horizontal

movement

of

the

tonearm

is

possible

for

playing.

CueContnol

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

layer

(41)

(moving

forwards)

lift

cam

(249)

rotates.

The

slide

bar

(256)

connected

to

lt

transmits

this

movement

to

the

lift

which

then

raises

the

tonearm.

After

moving

the

tonearm

into

the

required

position

an

the

record,

the

lever

is

re—

leased

by

gently

moving

to

the

rear.

As

Fig.

15

Tonearm

lift

tonearm

raised)

173

144

203

189

163

256

225

262

154

265

a

result,

slide

bar

(256)

is

released

and

the

tonearm

lowers

slowly.

Lowering

of

the

tonearm

is

damped

by

silicone

all

in

the

lift

tube.

The

heigt

of

the

stylus

above

the

record

can

be

varied

by

turning

adjusting

screw

(70

within

the

range

0

—

6

mm.

The

dis—

tance

is

increased

by

turning

clockwise

and

the

distance

between

record

and

stylus

can

be

reduced

by

turning

anti—clockwise.

249

41

256

201

70

216

258

Fig.

16

10

262

180

256

Cause

Tonearm

does

not

set

down

at

the

edge

of

the

record

Tonearm

does

not

set

down

on

record

after

operating

cue

control

Tonearm

lowers

onto

record

too

quickly

when

cue

control

is

operated.

Tonearm

returns

to

rest

after

manual

set—down

immediate—

ly

after

the

platter

starts

to

turn.

Ddect

a)

Tonearm

set—down

point

is

incor—

rectly

set

b)

c)

Record

non—stand—

ard

Friction

face

of

tonearm

coupling

dirty

d)

Anti—skating

set—

ting

im

incor—

rectly

set

Excessive

damping

in

the

lift

tube

as

a

result

of

contamina—

tion

of

the

silicone

all.

Damping

insufficient

as

a

result

of

un—

suitable

addition

of

lubricant

to

damping

compound.

Position

of

shut—

off

has

altered

du

—

ring

transport

of

the

unit

Replacement

of

Lift

Tube

1

.

Secure

unit

in

repair

jig,

set

stylus

force

to

0

and

lock

tonearm.

2.

Move

unit

into

head

position.

Detach

main

lever

(154)

and

compression

spring

(180).

3.

Disengage

tension

spring

(260),

undo

locking

washer

(268)

and

detach

skating'

lever

(265).

Be

careful

with

compression

spring

(267)

as

lt

may

drop

out.

4.

After

removing

lock

washer

(264)

and

ah—

ding

washer

(263)

detach

shut—off

bar

(262)

from

segment

(258).

5.

Remove

lock

washer

(201.

Turn

set

screw

(70)

until

bearing

(201

and

bar

(256)

are

accesibile.

6.

Undo

hexagon

nut

(259)

and

detach

seg—

ment

(258).

Be

careful

with

washer

(67)

as

lt

may

drop

out.

7.

Hold

tonearm

bearing

and

remove

hexagon

nut

(217).

Undo

machine

screw

(214)

and

detach

lift

tube

assembly

(209).

8.

Secure

tonearm

with

hexagon

nut

(217).

Remedy

a)

Set

control

lever

(12)

to

33

rpm.

The

adjusting

screw

in

the

hole

under

con—

trol

lever

(45)

will

be

exposed.

Then

place

a

30

cm

record

on

the

platter

and

start

the

unit.

If

the

stylus

sets

down

too

far

in,

the

adjusting

screw

should

be

turned

anti—clockwise,

if

the

stylus

sets

down

too

far

out,

the

screw

should

be

turned

clockwise

(Adjustment

im

only

carried

out

with

30

cm

records,

the

set—

ting

then

being

corrected

automatically

for

17.5

cm

records).

b)

Use

standard

record

c)

Clean

friction

surfaces

d)

Correct

anti—skating

setting

Remove

lift

tube

assembly

as

described

above,

detach

control

stud

on

the

lift

pin,

re—

move

safety

washer

(212),

detach

adjusting

sleeve

and

second

washer

(211).

Withdraw

lift

(216),

clean

lift

and

lift

tube.

Smear

lift

evenly

with

"Wakker

Silicone

Oil

AK

500

000".

Reassemble

com—

ponents.

Wipe

off

surplus

silicone

all

after

assembly.

Remove

lift

tube

assembly

as

described

above

detach

control

stud

on

the

lift

pin,

remove

lockwasher

(212),

detach

adjusting

sleeve

and

second

washer

(211).

Withdraw

lift

(216),

clean

lift

and

lift

tube.

Smear

lift

evenly

with

"Wakker

Silicone

Oil

AK

500

000".

Reassemble

components.

Wipe

eff

surplus

silicone

oil

after

assembly.

After

fitment

and

each

time

after

transport

the

unit

should

be

started

once

with

tone

—

arm

secured

for

automatic

adjustment

of

au—

tomatic

shut—off

(control

lever

(45)

to

"Start").

10