Dual 1211 Manual de usuario

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Dual

Edition

May

1973

Technical

data

Line

frequency:

Line

voltage:

Drive:

Power

consumption:

Current

requirements:

Turntable

speeds:

Speed

adjustment:

Turntable:

Wow

and

flutter:

Rumble:

Signal—to—noise

ratio:

Tonearm:

Cartridge

holder:

Weight:

Dimensions

cutouts:

and

mounting

Dual

1211

Service

Manual

alternating,

50

or

60

cycle,

with

appropriate

motor

pulleys

selector

for

110

or

220

volts

2

—pole

Dual

single—phase

induction

motor

or

4

—pole

asynchronous

motor

with

radialelastic

suspension

10

watts

approximately

at

220

V,

50

cycle

60

ma.

maximum

at

220

V,

50

cycle

115

ma.

maximum

at

117

V,

60

cycle

33

1/3,

45

and

78

r.p.m.

adjustment

of

1

semitone

(6

%)

at

all

three

turntable

speeds

weight

3.2

lbs.

,

dia

10

5/8"

less

than-

±

0.17

%

less

than

35

die

below

signal

levell

in

accordance

with

less

than

55

dB

below

signal

levelj

DIN

45

500

torsionally

rigid,

tubular

metal

arm

with

vertical

needle

bearings,

horizontal

ball

bearings.

Min.

stylus

force:

3

p

removable,

suitable

for

acceptance

of

cartridges

having

1/2"

mounting

and

possessing

a

weight

of

1

—

8

grams

9.7

lbs.

without

packing

see

installation

instructions

Dual

Gebrüder

Steidinger

•

7742

St.GeorgeniSchwarzwald

Download from www.dual.de

Not for commerical use

Fig.

1

Tonearm

hookup

schematic

right

channel

.

channel

1

I I

I I

--J

I -

I

)-

red

tonearm

junction

board

with

muting

switch

Q1

n

Q2

•

1

contact

plate

at

plug-in

head

plug-in

head

with

cartridge

red

green

mu-metal

housing

of

cartridge

%•••

phonograph

egme

.eeem:eßeeem,:eeedeä:

record

channel

1

red

r

—

—

•

inner

side

of

groove

left

channel

Q2

tonearm

circuit

left

channel

channel

2

white

I I I

I

•

I

2

channel

2

white

J

Q2

•

a)

with

miniature

5-pin

plug

channel

1

red

lead

channel

2

white

lead

red

b)

with

phono

plug

1

1

h

t 1

ir...

............

1 1

1 1 1

1

yellow

f

c)

with

banana

plugs

channel

1

red

channel

2

=

yellow

common

=

black

ground

=

green

----

--•

•

plug-in

head

spring

contacts

between

plug-in

cartridge

head

and

tonearm

white

blue

outer

side

of

groove

1

right

channel

2

Contents

Seite

Technical

data

1

Tonearm

hookup

schematic

2

Motor

and

drive

4

Pitch

Control

5

Turntable

does

not

turn

when

unit

is

plugged

in

and

"start"

switch

operated

5

Turntabel

does

not

came

up

to

speed

5

Rumble

in

reproduction

5

Correct

nominal

speed

obtained

only

at

extreme

settings

of

pitch

control

5

The

tonearm

and

its

suspension

6

Instructions

to

replace

the

complete

tonearm

and

bearing

assembly

6

Replacement

of

tonearm

6

Tonearm

head

is

not

parallel

to

turntable

platter

7

Stylus

skips

7

Tonearm

sets

down

beside

tonearm

rast

7

Horizontal

pivot

friction

too

high

7

Vertical

movement

of

tonearm

is

impeded

during

set—down

cycle

7

Tonearm

movements

8

Tonearm

lift

(cue

control)

8

Tonearm

misses

edge

of

record

9

Tonearm

strikes

record

during

change

cycle

9

Tonearm

does

not

move

onto

record

when

drop

cycle

is

started

9

Tonearm

lowers

too

quickly

when

drop

cycle

is

started

9

Tonearm

returns

to

rest

immediately

after

being

placed

an

record

manually

9

Start

cycle

9

Manual

start

10

Stop

switching

10

Muting

switch

11

Record

drop

11

Shut—off

and

change

cycle

11

Shut—off

mechanism

12

Turntable

stops

after

automatic

setdown

of

the

tonearm

12

Last

record

keeps

repeating

12

Record

does

not

drop

when

unit

is

switched

to

"start"

13

Record

drops

when

unit

is

switched

to

"stop"

13

Records

do

not

drop

13

Switch

latches

into

"stop"

position

when

tonearm

is

at

rast

14

During

change,

stop

and

start

operations,

noises

from

the

mechanism

can

be

head

in

system

speaker

14

No

sound

14

Motor

will

not

shut—off

when

tonearm

is

on

arm

rest

14

Acoustic

feedback

14

Lubrication

15

Replacement

parts

and

exploded

views

16-22

3

Fig.

2

Motor

suspension

and

turntable

drive

102

7

6

106

135

108

107

Motor

and

drive

MN

r&ram

u

_

221

176/131

148

136/144

133/140

114/189

The

turntable

platter

and

the

mechanism

are

driven

by

either

a

4

—pole

(131)

or

a

2

—pole

(176)

induction

motor.

Both

motors

have

a

balanced

armature,

polished

bearing

surfaces

and

are

guaranteed

vibration—free.

The

4

—pole

motor

has

the

additional

advantage

of

a

very

small

stray

magnetic

field.

The

speed

of

the

motors

is

constant

over

a

supply

voltage

range

of

10

%.

Deviations

in

speed

depend

on,

and

are

proportional

to,

line

frequency.

Adaptation

of

the

motor

to

50

or

60

Hz

power

is

accomplished

by

changing

the

motor

pulley

(11

4

/

1

89).

2

—pole

motor:

pulley

for

50

Hz

part

no.

pulley

for

60

Hz

part

no.

4

—pole

motor:

pulley

for

50

Hz

part

no.

pulley

for

60

Hz

part

no.

212

135

212

136

220

970

220

971

Fig.

3

Motor

field

connections

(less

voltage

selector)

-

r

----

1

1

•

L

110/125

>

•

The

motor

pulley

is

secured

to

the

motor

shaft

by

a

setscrew.

When

a

pulley

is

replaced

or

ex—

changed,

lt

must

be

set

at

the

correct

height

(see

Figs.

5

and

6).

The

turntable

platter

is

driven

by

the

idler

wheel

(133/140)

which

is

automatically

disen—

gaged

from

the

motor

pulley

when

the

unit

is

shut—off,

in

order

to

protect

its

driving

sur—

face.

Turntable

speeds

of

33

1/3,

45,

78

rpm

are

se—

lected

by

raising

or

lowering

the

idler

wheel

(133/140)

to

the

appropriate

step

on

the

motor

pulley.

When

the

selector

lever

(6)

is

moved,

the

selec—

tor

segment

(105)

rotates.

This

causes

the

lever

(107)

fitted

in

the

slot

of

the

selector

seg—

ment

to

move

in

a

vertical

direction.

The

idler

wheel

(13

3

/

1

40)

mounted

on

the

swinging

arm

(136/144)

is

lifted

off

the

motor

pulley

and

set

down

again

on

the

motor

pulley

step

for

the

adjacent

speed.

Fig.

4

Motor

field

connections

(with

voltage

selector)

17571

,

220/240V

4

tb,

Pitch

Control

For

turntable

speeds

33

1/3,

45

and

78

rpm,

the

unit

incorporates

a

voltage—indepen—

dent

pitch

control,

which

permits

a

turn—

table

speed

variation

of

up

to

6

%

(appro—

ximately

one

semitone).

When

the

pitch

control

knob

(7)

is

turned,

the

switch

segment

(105)

and

the

switch

lauer

(107)

attached

to

it

are

moved

up

or

down.

This

vertical

displacement

changes

the

position

of

the

idler

wheel

on

what—

ever

step

of

the

motor

pulley

lt

has

been

placed

on

(by

the

speed

selector),

and,

due

to

the

tapered

shape

of

the

pulley,

effects

approximately

+

3

%

variation

in

speed.

Symptom

Cause

Fig.

5

Motor

pulley

(2

—pole

motor

Remedy

osition

Turntable

does

not

run

when

unit

is

plugged

in

and

start

switch

opera—

ted

Turntable

does

not

come

up

to

speed

a)

Current

path

to

motor

interrupted

b)

Idler

wheel

(133/140)

not

in

contact

with

platter

Motor

pulley

lose

Motor

pulley

is

not

correct

for

local

line

frequency

b)

Slippage

between

id—

ler

wheel

(133/140)

and

motor

pulley

or

platter

c)

a)

c)

Excessive

friction

in

motor,

drive

wheel

or

platter

bearings

Rumble

in

reproduction

Worn

idler

wheel

Symptom

Correct

nominal

speed

obtained

only

at

extreme

settings

of

pitch

control

Cause

Idler

wheel

does

not

contact

motor

pulley

correctly

Remedy

a)

4

—pole

motor

Loosen

setscrew

(115)

and

by

means

of

setscrew

(113)

adjust

the

motor

pulley

on

the

motor

shaft

so

that

when

the

fine

speed

adjustment

knob

is

in

the

center

of

its

range,

the

idler

wheel

is

posi—

tioned

in

the

center

of

the

appropriate

motor

pulley

step.

(Fig.

6

).

When

ad—

justment

is

completed,

tighten

setscrew

(115).

b)

2

—pole

motor

After

loosening

locknut

(143),

correct

the

idler

wheel

position

by

turning

its

shaft

(142)

so

that

when

the

fine

speed

adjustment

knob

(7)

is

in

the

center

of

its

range,

the

idler

wheel

is

centered

in

the

appropriate

step

of

the

motor

pulley

(Fig.

5).

After

adjustment,

tighten

locknut.

a)

b)

Check

connection

at

switch

plata

voltage

selector

Check

switch

lever

assembly

(107)

c)

Tighten

motor

pulley

a)

Change

motor

pulley

c)

and

Clean

friction

surfaces

of

idler

wheel,

motor

pulley

and

turntable

platter.

If

necessary,

replace

drive

wheel.

Once

the

drive

surface

of

the

platter

has

been

cleaned,

da

not

touch

lt

with

your

fingers

Clean

and

oil

bearings

Replace

idler

wheel

(133/140)

and

clean

platter

drive

surface

and

motor

pulley

with

greaseless

solvant.

Once

surface

are

cleaned,

da

not

touch

them

with

your

fingers.

Fig.

6

Motor

pulley

position

(4

—pole

motor)

5

Fig.

7

Tonearm

bearing

assembly

The

tonearm

and

its

suspension

Fig.

8

Tonearm

bearing

assembly

(under

view)

272

278

218

The

tonearm

of

the

Dual

1211

is

balanced

by

springtension,

held

vertically

by

needle

bearings

and

horizontally

by

ball

bearings.

The

tonearm

60

head

is

removable.

Before

setting

stylus

pressure

according

to

the

cartridge

used,

the

arm

has

to

be

balanced

at

zero.

The

tonearm

is

lifted

by

turning

knurled

screw

(52)

counterclockwise

(as

seen

from

the

front),

and

moved

down

by

turning

it

clockwise.

Cartridges

between

1

to

8

grams

can

be

balanced,

piezo—electric

(crystal)

cartridges

haue

to

be

used

on

units

with

2

pole

motors.

The

stylus

pressure

is

changed

by

turning

the

numbe—

red

springhousing

(58),

wich

increases

or

de—

creases

the

tension

on

the

enclosed

spring.

Pressure

can

be

regulated

from

0

to

5.5

grams

continuously,

minimum

pressure

3.0

grams.

Instructions

to

replace

the

complete

tonearm

and

bearing

assembly

1.

Tighten

set

in

repair—jig,

set

pressure—dial

to

zero

and

lock

tonearm

in

rest.

2.

Turn

unit

upside

down

and

unsolder

tonearm

leads.

3.

Remove

main—lever

(218)

and

linking—lever

(272).

4.

Remove

lock—washer

(280)

and

skating—disc

(279),

remove

shut—off

slide

(278)

from

eccen—

tric

bolt

on

segment.

5.

Loosen

cylinder—head

screws

(274/275)

and

remove

segment

(276)

with

lifting bolt

(250).

6.

Loosen

lock—washer

(177),

turn

unit

right—side

up

and

pull

the

complete

tonearm

with

bearing

frame

assembly

upwards

out.

Installation

of

tonearm

complete

with

bearing

frame

assembly

has

to

be

done

in

reversed

order.

The

unit

is

in

normal

position.

Check

ball

bea-

62

rings

(14

steel—balls

2

mm

diameter),

insert

tonearm

complete

with

bearing

frame

assembly

and

58

lock

in

rest.

With

tonearm

held

in

place,

turn

set

upside

down,

push

lock

washer

(177)

into

the

notch

at

the

shaft

of

the

bearing

frame

assembly.

52

Put

on

segment

(276).

Before

tightening

screws

(274/275),

check

tonearm

position

on

tonearm

59

rest,

which

is

correct,

if

tonearm

sinks

into

rest

without

hesitation.

Replacement

of

tonearm

To

remove

the

tonearm

from

the

bearing

frame,

the

pressure

dial

has

to

be

set

of

zero,

after

unsoldering

the

tonearm

leads.

Unhook

tension

spring

(59).

Remove

locknut

(47)

with

threaded

rod

(46)

and

bearing

screw

(62)

(left

threaded),

remove

tonearm

carefully

out

of

bearing

frame.

6

Symptom

Fig

.

9

Tonearm

head

is

not

parallel

to

turntable

platter

Cause

Orientation

of

tonearm

head

an

tonearm

tube

has

altered

because

of

jolting

in

transport

(shipping)

Remedy

Remove

turntable

platter

with

the

help

of

a

screwdriver

inserted

trough

the

hole

in

the

chassis

placed

there

for

the

purpose.

Loo—

sen

screw

on

tonearm

head.

After

correcting

the

tonearm

head,

tighten

screw.

(Fig.

9)

Symptom

Cause

Remedy

Stylus

skips

a)

Tonearm

not

balanced

a)

Balance

tonearm

according

to

operating

instructions

b)

Stylus

force

too

lau

b)

Set

stylus

force

to

cartridge

manu—

facturer's

recommended

value

c)

Stylus

worn

or

chip—

c)

Replace

stylus

ped

d)

Excessive

friction

in

d)

Check

tonearm

horizontal

pivot

tonearm

bearing

e)

Ball

(255)

missing

e)

Replace

ball

(255)

from

shut—off

rail

Tonearm

sets

down

beside

Arm

segment(276)

icor—

tonearm

rest

rectly

adjusted

Horizontal

pivot

fric—

tion

too

high

Vertical

movement

of

tonearm

is

impeded

du

—

ring

set—down

cycle

Tonearm

is

set

too

high

an

tonearm

lift.

Main

layer

jams

against

guide

pin

of

lift

screw

as—

sembly

Correct

adjustment:

Loosen

machine

screw

(274/275)

and

rotate

segment(276)

until

adjustment

is

correct,

namely

when

arm

lowers

onto

rest

without

binding.

Tighten

screw

Stylus

should

be

na

farther

from

record

surface

than

1/4".

Adjust

a)

Bearing

friction

too

a)

Check

bearing

screw

(46)

and

arm

balance

high

b)

Lift

screw

(250)

b)

Remove

and

clean

lift

screw

jams

in

guide

sleeve

of

arm

segment

(255)

7

Fig.

10

Tonearm

guide

mechanism

214

155

Tonearm

movements

51

A

guide

groove

located

on

the

underside

of

the

main

cam

(242)

controls

the

automatic

lift

and

set-down

of

the

tonearm

as

the

cam

rotates

trought

360

0

.

Tonearm

Tonearm

lift

(Cue

control)

The

tonearm

lift

permits

the

tonearm

set

down

an

the

record

safely

at

any

point

except

the

shut-off

area

(neer

record

label).

218

to

be

desired

the

Pulling

the

tonearm

lift

towards

the

front

turns

the

drive

washer

(261).

This

moves

the

connecting

lever

(272),

main

lever

(218)

and

lift

screw

(250)

to

reise

the

tonearm.

After

the

tonearm

is

moved

(by

hand)

to

the

desired

spot

an

the

record,

the

tonearm

lift

handle

is

lightly

tapped

towards

the

rear

to

Fig.

11

Tonearm

lift

(tonearm

raised)

268

227

226

lift

and

lowering

are

controlled

by

the

main

layer

(218)

and

the

lift

screw

(250).

Horizontal

move-

ments

are

controlled

by

the

main

lever

(218)

and

the

segment

(276).

Setting

the

changer

Vor

playback

269

of

7",

10"

or

12"

discs

is

done

with

the

indexing

lever

(24).

Setdown

points

are

determined

by

the

eccentric

portion

of

the

arm

positioning

slide

(269)

and

the

indexing

lauer

(267).

224

221

271

242

Horizontal

movement

of

the

tone

-

272

arm

is

limited

by

the

arm

segment

striking

the

arm

positioning

slide

(269).

During

the

change

cycle,

the

278

main

lever

(218)

raises

the

arm

po-

sitioning

slide,

bringing

it

wit-

hin

reach

of

the

spring

stud.

On

completion

of

the

change

cycle

(set-

down

of

the

tonearm

an

the

record),

the

arm

positioning

slide

(269)

is

again

released

and

returns

to

its

normal

position.

lt

thus

moves

out

of

reach

of

the

spring

stud,

per-

mitting

the

tonearm

to

move

hori-

zontally

without

hindrance,while

play-

ing

the

record.

release

the

mechanism.

The

connecting

lever

(272)

and

the

leaf

spring

(215)

of

the

main

lever

(193)

are

freed,

allowing

the

tonearm

to

fall.

The

rate

of

fall

is

controlled

by

silicone

grease

an

the

drive

washer

(261).

The

height

of

the

stylus

above

the

record

can

be

varied

fron

zero

to

about

1/4"

by

adjusting

setscrew

(231).

Turning

it

to

the

right

increases

the

height,

turning

it

to

the

left

decreases

the

height.

64

8

265

230

272

271

231

249

250

276

Symptom

Cause

Remedy

•

Tonearm

misses

edge

of

a)

Set

—down

incorrectly

record

adjusted

Tonearm

strikes

record

during

change

cycle

b)

Record

not

standard

size

a)

djust

set—down

with

a

12"

record

so

that

stylus

touches

record

approxima—

tely

1/16"

inside

edge

of

record.

Ad—

justment

will

be

correct

for

other

sizes

b)

Use

standard

records

c)

Friction

surfaces

of

c)

Clean

clutch

surfaces

tonearm

clutch

dirty

Tonearm

height

incorrect—

Adjust

arm

height

with

screw

(48).

Height

ly

set

is

correct

when

stylus

tip

is

1/16"

to

1/8"

above

start

switch

(25)

when

arm

is

removed

from

rest

lowered

Tonearm

does

not

move

on—

Damping

too

grast,

drive

to

record

when

drop

washer

dirty

cycle

is

started

Tonearm

lowers

too

quickly

when

drop

cycle

is

started

Tonearm

returns

to

rest

immediately

after

being

placed

on

record

manual—

ly

Too

little

damping

Shut—off

mechanism

has

shifted

out

of

position

during

shipping

Start

cycle

Moving

the

start

switch

(25)

moves

the

switch

lever

(224)

towards

the

main

cam

(242),

initiating

the

fol—

lowing

sequence.

a)

The

set

screw

of

the

switch

le—

ver

assembly

(224)

turns

the

switch

arm

(221)

mounted

on

the

grooved

shaft

(227).

Via

a

ten—

sion

spring,

this

actuates

the

rocker

assembly

(107)

and

enga—

ges

the

idler

(133/140)

between

the

platter

(5)

and

the

motor

pulley

(114/189).

At

the

same

time,

the

power

switch

(182)

is

actuated

by

the

switch

slide

(184)

through

the

switch

arm,

and

the

turntable

begins

to

ro—

tate.

b)

The

switch

lever

(224)

is

brought

within

reach

of

the

cam

follower

lever

(245),

so

that

it

is

pushed

into

the

change

position

after

the

rotation

of

the

main

cam.

Loosen

nut

(229)

and

washer

(230)

and

drive

washer

(261).

Clean

thoroughly.

Coat

both

sides

evenly

with

silicone

grosse,

re—assemble

and

wipe

off

excess

Loosen

nut

(229)

and

washer

(230)

and

drive

washer

(261).

Clean

thoroughly.

Coat

both

sides

evenly

with

silicone

grease,

re—assemble

and

wipe

off

excess

Before

using

changer

after

moving,

run

it

through

start

cycle

with

tonearm

locked

on

rest

Fig.

12

Start

position

271

242

220

225

272

262

265

268

221

212

227

226

224

207

208

267

9

Fig.

13

Stop

position

le

(

mperz

,,!.\;......_

242

271

272220

225

224262

Fig.

14

Muting

switch

221

Av

212

227

-

iintionue:12.»

-

eipe;

265

268

Cam

wheel

at

zero:

Contacts

of

muting

switch

opened

Cam

wheel

is

turning:

Contacts

of

muting

switch

closed

Moving

the

operating

switch

also

releases

the

start

lever

(226),

pulling

lt

towards

the

main

cam

by

means

of

the

tension

spring

(225).

This

causes

coil

spring

to

bring

the

shut—off

lever

(238)

within

range

of

the

main

cam

dog.

Thus

the

shut—off

lever

drives

the

main

cam.

226

To

prevent

malfunctioning,

the

ope—

rating

switch

is

locked

during

the

start

cycle

(that

is,

while

the

main

cam

is

turning).

Just

before

the

main

cam

resches

its

neutral

position

(at

the

end

of

the

change

207

cycle),

the

start

lever

is

pushed

clear

of

the

main

cam

by

the

start

pin

of

the

main

cam.

This

restores

208

the

switch

lauer

and

operating

switch

to

their

original

positions.

267

After

installation

and

also

after

moving

the

changer,

the

unit

should

be

started

with

the

tonearm

locked

on

the

rest.

This

will

automati—

cally

re—adjust

the

shut—off

lever,

which

may

haue

shifted

out

of

po—

sition.

Manual

start

When

the

tonearm

(15)

is

suung

in

—

ward

by

hand,

the

paul

on

the

switch

arm

drops

into

a

support

on

the

base

plate,

holding

the

switch

arm

in

this

position

and

the

idler

wheel

(133/140)

in

contact

with

the

platter.

The

slide

(184)

linked

with

the

switch

arm

actuates

the

power

switch

and

sets

the

turn—

table

platter

rotating.

On

reaching

the

run—out

groove,

the

tonearm

automatically

returns

to

its

rest

position

and

the

unit

shuts

itself

off.

(See

shut—off

mechanism,

next

side).

However,

if

the

tonearm

is

lifted

off

the

re—

cord

manually

and

returned

to

the

rest,

the

tabs

of

the

arm

segment

(276)

release

the

pawl.

The

tor—

sion

spring

(220)

then

returns

the

switch

arm

to

its

initial

position,

opening

the

power

switch

and

disen—

gaging

the

idler

wheel.

Stop

switching

When

the

operating

lever

is

moved

to

"stop",

the

starting

lever

(226)

is

pushed

forward.

As

a

result

the

shut—off

linkage

comes

into

contact

with

the

main

cam.

The

swinging

le—

ver

(245)

remains

in

its

stop

po—

sition.

When

the

tonearm

is

on

its

rest

and

the

operating

lauer

is

pushed

to

"stop",

the

operating

lever

must

not

jam.

10