Dual 1226 User manual

Edition

June

1974

Dual

1226

Service

Manual

Technical

data

Current

type

Line

voltage

Drive

Power

consumption

Current

requirements

Platter

speeds

Pitch

control

Wow

and

flutter

Signal-to-noise

ratio

Tonearm

bearing

frictions

Pick-up

head

(cartridge

holder)

Stylus

pressure

Pick-up

cartridge

Weight

Dimensions

and

mounting

cutouts

AC

50

or

60

cycle,

with

appropriate

motor

pulleys

110/130

V

and

220/240

selector

Four-pole

Dual

asynchronous

motor

<

10

Watt

approx,

64

mA

at

220

V

50

cycle,

approx.

115

mA

at

110

V

60

cycle

non-magnetic

1,8

kg

(4

Ig)

270

mm

(10.5

in,)

diameter

33

1/3

and

45

rpm,

automatic

tonearm

setdown

coupled

to

speed

selector

Adjustment

of

approx.

1

semi-tone

(6

%)

at

both

platter

speeds

<

£0.12%

Rumble

signal-to-noise

ratio

>

57

dB

Rumble

unweighted

signal-to-noise

ratio

>

38

dB

in

accordance

with

DIN

45

500

Torsionally-rigid

tubular

aluminum

arm

with

vertical

and

horizontal

pivot

mounting

(referred

to

stylus

top)

vertical:

less

than

0,01

gram

horizontal:

less

than

0.04

gram

Removable,

suitable

for

acceptance

of

all

cartridges

having

1/2’’

mounting

and

a

dead-

weight

of

2

-

10

grams

(including

mounting

fixtures)

Continuously-adjustable

from

0

-

8

p,

reliable

as

from

0.5

p

stylus

pressure

See

separate

data

sheet

approx.

9.2

Ib

see

installation

instructions

Dual

Gebruder

Steidinger

-

7742

St.

Georgen/Schwarzwald

Fig.

1

Pick-up

Connection

Diagram

A

right

channel

left

channel

4

ag

pee

OU,

Cy

ene

a

ios

aay

oon

lea

i

ed

Bes

|

i

|

a,

i

aD

C

red

.

i

aE

ctrl

ee

alll

eS

oe

||:

ee

ee.

ed

Fog

!

be

“J

va

—--—=

|

—--

|

!

1

!

1

a)

with

miniature

plug

5-pin

poor

oo

or

re

a

1

right

channel

!

'

red

lead

|

t

H

left

channel

!

white

lead

I

!

\

b)

with

phono

plug

!

we

|

2

ii

|

)

H

t

black

white

ee

eee

ee

Se

_4

(red)

(yellow)

black

i

\

right

channel

'

left

channel

red

|

White

|

1

Mass

right

channel

green

Mass

left

channel

blue

ae

Nh

Mass

sheet

pos

Contact

plate

at

tonearm

head

Tonearm

head

Spring

contacts

between

plug-in

cartridge

head

and

tonearm

Cartridge-holder

red

|

white

!

green

|

Cartridge

et

Record

Q

——a

inner

side

of

groove

2

Q,

outer

side

of

groove

left

channel

right

channel

Contents

Technical

Data

Pick-up

Connection

Diagram

Motor

and

Drive

Pitch

Control

Platter

does

not

run

when

unit

is

plugged

in

and

start

switch

operated

Platter

does

not

reach

required

speed

Rumble

in

reproduction

Correct

nominal

speed

obtained

only

at

extreme

settings

of

pitch

control

Pick-up

head

not

parallel

to

platter

Tonearm

and

Suspension

Tonarm

Anti-skating

Device

Stylus

skips

Tonearm

sets

down

beside

tonearm

rest

Horizontal

pivot

friction

too

high

Tonearm

Guide

Mechanism

Tonearm

Lift

Tonearm

misses

edge

of

record

Tonearm

strikes

record

during change

cycle

Tonearm

does

not

move

onto

record

when

drop

cycle

is

started

Tonearm

lowers

too

quickly

when

drop

cycle

ist

started

Tonearm

returns

to

rest

immedistely

after

being

placed

on

record

manually

Start

Cycle

Manual

Start

Stop

Switching

Muting

Switch

Record

Drop

Shut-off

and

Change

Cycle

Shut-off

Mechanism

Platter

stops

after

automatic

set-—down

of

tonearm

The

last

record

of

a

stack

keeps

repeating

After

adjusting

the

tonearm

set-down

point

for

7"

records

the

set-down

pont

is

not

correct

for

12"

records

Record

drops

when

unit

is

switched

to

"stop"

Records

do

not

drop

Vertical

tonearm

movement

restricted

during

set-down

Tonearm

moves

with

stylus

force

and

anti-skating

force

at

zero:

a)

outward,

b)

inward

Disturbing

noises

during

change

operation

No

sound

Motor

does

not

shut

off

Acoustic

feedback

Spare

Parts

with

Exploded

Views

Lubrication

own

ono

vo

OTD

MAN

NNN

OU

10

i

11

12

13

14

15-20

21

Fig.

2

Motor

suspension

and

platter

drive

mama

11

a!

erent

rier

raecqaatasseeeere

Ion

[ta

Pl

74

we

14

104

13

109126

108 130

Motor

and

Drive

The

turntable

platter

and

change

mechanism

are

driven

by

a

vibration-free

four-pole

motor

(123)

with

an

extremely

low

stray

magnetic

field.

Motor

speed

is

constant

for

line-voltage

variations

of

+

10

%.

It

is

dependent

on

(and

proportional

to)

line

frequency.

Two

interchangeable

motor

pulleys

(120)

are

available

for

adapting

the

changer

to 50

or

60

Hz

operation:

Motor

pulley

for

50

Hz

operation:

Motor

pulley

for

60

Hz

operation:

part

no.

232

899

part

no.

232

898

The

motor

pulley

is

secured

to

the

motor

shaft

by

a

setscreuw.

Fig.

3

Motor field

connections

(less

connection

plate)

218

The

turntable

platter

is

driven

by

the id-

ler

wheel

(150)

which

is

automatically

di-

sengaged

from

the

motor

pulley

when

the

unit

is

shut

off,

in

order

to

protect

its

driving

surface.

Turntable

speeds

of

33

1/3

and

45

rpm

are

selected

by

raising

or

lowering

the

idler

wheel

(1503

to

the

appropriate

step

on

the

motor

pulley.

When

the

selector

lever

(44)

is

moved,

the

selector

segment

(108)

rotates.

The

causes

the

lever

(130)

fitted

in

the

slot

of

the

selector

segment

(108)

rotates.

This

causes

the

lever

(130)

fitted

in

the

slot

of

the

selector

segment

to

move

in

vertical

direc-

pulley

and

set

down

again

on

the

motor

pul-

ley

step

for

the

adjacent

speed.

Fig.

4

Motor

field

connections

(with

connection

plate)

220-240V

Pitch

Control

For

platter

speeds

of

33

1/3

and

45

rpm

the

unit

incorporates

a

power-independent

pitch

control

which

permits

a

platter

speed

varia-

tion

of

up

to

6

%

(approximately

one

semi-

tone).

When

the

pitch

control

knob

(13)

is

turned,

the

suitch

segment

(108)

and

the

switch

le-

ver

(130)

attached

to it

are

moved

up

or

down.

This

vertical

displacement

changes

the

position

of

the

idler

wheel

on

whatever

step

of

the

motor

pulley

it

has

been

placed,

by

the

speed

selector,

and

due

to

the

ta-

pered

shape

of

the

pulley

effects

approxi-

mately

+

3

%

variation

in

speed.

Trouble

Cause

Platter

does

not

a)

Current

path

to

run

when

unit

is

motor

interrupted

plugged

in

and

b)

Idler wheel

(150)

start

switch

opera-

not

in

contact

ted

with

platter

c)

Motor

pulley

loose

Platter

does

not

a)

Motor

pulley

is

reach

required

not

correct

for

speed

local

line

fre-

quency

b)

Slip

between

id-

ler

wheel

(150)

and

motor

pulley

(113)

or

platter

c)

Excessive

fric-

tion

in

motor,

idler

wheel

or

platter

bearings

Rumble

in

repro-

Worn

idler wheel

duction

Idler

wheel

does

not

contact

motor

pulley

correctly

Correct

nominal

speed

obtained

only

at

extreme

settings

of

pitch

control

Trouble

Tonearm

head

is

not

parallel

to

turntable

platter.

Cause

Orientation

of

tonearm

head

on

tonearm

tu-

be

has

altered

because

of

jolting

in

trans-—

port

(shipping).

Remedy

Remove

turntable

platter

with

the

help

of

a

screwdriver

inserted

through

the

hole

in

the

chassis

placed

there

for the

purpose.

“Loosen

screw

on

tonearm

head.

After

correc

ting

the

tonearm

head,

tighten

screw.

(Fig,

6).

Fig.

5S

Position

of

idler

wheel

Remedy

a)

Check

connection

at

switch

plate

and

voltage

selector

b)

Check

switch

lever

assembly

(130)

c)

Tighten

motor

pulley

a)

Change

motor

pulley

b)

Clean

friction surfaces

of

idler

wheel,

motor

pulley

and

turntable

platter.

If

necessary,

replace

idler

wheel.

Once

the

drive

surface

of

the

platter

has

been

cleaned

do

not

touch

it

with

your

fingers

c)

Clean

and

oil

bearings

Replace

idler

wheel

(150),

clean

platter

drive

surface

and

motor

pulley

with

grea-

seless

solvent.

(Once

surfaces

are

cleaned

do

not

touch

them

your

fingers).

Adjust

position

of

idler wheel

by

turning

adjustment

screw

(5)

so

that

when

the

fine

speed

adjustment

knob

(13)

is in

the

center

position

the

correct

nominal

speed

is

achie-

ved.

(fig.

5)

Fig.

6

Tonearm

and

Tonearm

Suspension

The

tonearm

of

the

Dual

1226

is

counter

balanced

and

pivot

mounted

vertically

and

horizontally.

This

provides

extremely

fa-

vourable

tracking

characteristics.

The

to-

nearm

head

is

removable.

To

aid

in

repla-

cing

or

adjusting

the

tonearm

head

a

hole

Fig.

7

B

Tonearm

bearing

assembly

237 244 245

Tonearm

bearing

assembly

(view

from

underneath)

is

provided

in

the

chassis

to

facilitate

adjustment

of

the

tonearm

head

without

First

removing

the

tonearm.

Before

setting

the

correct

stylus

force

for

the

cartridge

which

has

been

installed

the

tonearm

should

be

balanced

with

the

stylus

force

setting

at

zero.

It

is

recommended

that

balancing

should

be

carried

out

in

the

direct

vici-

nity

of

the

tonearm

rest.

This

is

carried

out

by

rotating

the

counterweight.

The

counterweight

is

designed

so

that

it

can

balance

cartridges

with

weights

from

1

-

10

g.

For

shock

absorption

(absorption

of

brief

shocks)

the

counterweight

is

flexibly

moun-

ted

on

the

tonearm

and

secured

to

prevent

unintentional

rotation.

The

tonearm

head

is

designed

to

accept

all

cartridges

with

in-

ternationally

standard

1/2"

mounting

centers

and

with

a

weight

not

exceeding

10

gq.

Stylus

force

is

set

by

rotating

the

graduated

spring

housing

(56)

and

thus

tensioning

or

slacke-

ning

the

coil

spring

contained

therein.

The

scale

is

calibrated

for

an

adjustment

range

of

0

-

5

p,

permitting

accurate

setting

within

that

range

in

0.5

p

steps.

To

replace

the

complete

tonearm

and

bearing

assembly

we

recommend

proceeding

as

follows:

1.

Tighten

unit

in

repair

jig,

set

stylus

force

scale

to

zero

and

lock

the

tonearm

in

position.

2.

Turn unit

upside

down,

remove

retainer

sprin

(193)

and

unsolder

tonearm

leads.

3.

Slacken

hexagon

nuts

(236)

then

remove

to-

nearm.

Tonearm

complete

with

bearing

frame

assem—

bly

should

be

refitted

in

reverse

order.

Before

replacing

the

tonearm

first

loosen

counternut

(245)

and

slightly

turn

threa-

ded

(244).

After

reinstallation

read-

just

play

of

bearing

using

the

threaded

(see

page

7).

To

remove

the

tonearm

from

the

bearing

fra-

me

unsolder

the

tonearm

leads

and set

the

tonearm

tracking

force scale

to

zero.

Unscrew

locknut

(42)

with

setscrew

(41)

and

bearing

screw

(62)

(left-hand

thread).

Carefully

remove

tonearm

from

bearing

frame.

Anti-Skating

Device

The

geommetrically

caused

skating

force

ac—

ting

on

any

tonearm

is

eliminated

to

a

lar-

ge

extent

in

the

case

of

the

Dual 1226

by

means

of

a

precision

antiskating

device.

The

skating

force

is

dependent

on

the

tone

arm

geometry,

on

the

stylus

force

and

the

tip

radius

of

the

cartridge

stylus.

The

inward

pull

of

the

tonearm

caused

by

the

skating

effect

leads

not

only

to

undesirable

jumping

of

the

tonearm

when

set

down

on

the

record

but

also

unequal

forces

on

the

two

opposite

groove

walls

with

resultant

unfavourable

ef—

fects.

These

can

be

corrected

with

the

aid

of

a

suitable

anti-skating

device.

By

tur-

ning

the

knob

(70)

of

the

anti-skating

de-

vice

located

on

the

cover

the

asymmetrical

plate

cam

(230)

is

moved.

This

plate

cam

has

two

different

curvatures

which,

accor-—

ding

to

the

different

scales

used,

for

sphe-

tical

and

elliptical

tip

styli

and

for

CD

4

pick

up

cartridges,

move

the

skating

lever

(234)

out

of

its

position

of

rest

and

trans-

mit the

counter

force

to

the

tonearm

by

means

of

the

tension

spring

(242).

Skating

adjustment

is

set

at

the

works

for

conical

styli

with

a

tip

radius

of

15

+

2

pm

and

for

elliptical

styli

with

measurements

of

5/6

and

18/22

wm

and

also

for

CD

4

cartrid-

ges.

The

hexagon

nut

(231)

is

firmly

tighte-

ned and

locked

with

paint.

Readjustment

should

only

be

attempted

with

the

aid

of

the

Dual

Skate-O-Meter

and

the

L

096

test

record.

This

is

best done

by

authorised

Dual

service

station.

Trouble

Cause

Stylus

skips

a)

Tonearm

not

balanced

b)

Stylus

force

too

low

c)

Stylus

worn

or

chip-

ped

d)

Excenssive

friction

in

tonearm

bearing

e)

Ball

(201)

missing

from

shut-off

rail

f)

Anti-skating

wrongly

adjusted

Fig.

9

a)

Anti-skating

force

O-set-

b

Anti-skating

force

——

V-spring

ting.

No

compensation

of

the

skating

force

ta-

kes

place

as

a

result

of

the

action

of

the

tension

spring

at

the

fulcrum

of

the

tonearm.

=

Anti-skating

mechanism

set

to

1.5”

on

the

scale

for

elliptical

styli,

Tone-

arm

on

tonearm

rest.

The

tension

spring

pro-

duces

the

anti-skating

force

which

is

transmit-

ted

to

the

tonearm

via

the

segment.

The

V-spring

presses

the

skating

lever

against

the

plate

cam,

As

"'b"’

but

tonearm

abo-

ve

platter.

Remedy

a)

Balance

tonearm

according

to

operating

b)

c)

d)

e)

f)

instructions

Set

stylus

force

to

cartridge

manufactu-

rer's

recommended

value

Replace

stylus

Check

tonearm

horizontal

pivot.

Should

have

barely

noticeable

play.

Adjust

verti-

cal

bearing

only

with

the

left

bearing

screw

pat

and the

horizontal

bearing

screu

(244).

Horizontalbearing

is

correctly

adjusted

when

the

tonearm,

with

anti-skating

0.5

p,

swings freely

from

center

to

rest.

Replace

ball

(201).

Correct

antiskating

setting

Fig.

10

Tonearm

guide

mechanism

i

ae

174

177

45

A

161

187 173

203

219

237

Tonearm

Lift

The

tonearm

lift

permits

the

tonearm

to

be

set

down

on

the

record

safely

at

any

desi-

red

point

outside

the

shut-off

area.

Moving

the

tonearm

lift

handle

(49)

for-

ward

causes

lift

cam

(227)

to

rotate.

This

movement

is

transmitted

via

positioning

slide

(219)

to

the

lift

which

then

raises

the

tonearm,

Fig.

11

Tonearm

lift

(tonearm

raised)

Tonearm

Guide

Mechanism

A

guide

groove

located

on

the

underside

of

the

main

cam

(161)

controls

the

automatic

lift

and

set-down

of

the

tonearm

as

the

cam

rotates

through

3609,

Tonearm

lift

and

lowering

are

controlled

by

main

lever

(173)

and

lift

screw

(241).

Horizontal

movements

are

controlled

by

the

main

lever

(173)

with

segment

(237).

Automatic

tonearm

set-down

is

designed

for

12"

and

7"

records

and

is

coupled

to

the

platter

speed

selector.

Set-down

points

are

determined

by

the

spring

of

segment

ee

contacting

the

positioning

slide

(219)

which

is

only

raised

by

the

main

le-

ver

(173)

during

the

change

cycle

and

thus

moves

within

reach

of

the

spring

fit-

ted

on

the

segment.

On

completion

of

set-—

down

or

change

cycle

(tonearm

sets

down

on

the

record)

the

positioning

slide

(219)

is

released

again

and

returns

to

its

normal

po-

sition.

It

thus

moves

out

of

reach

of

the

spring

permitting

the

tonearm

to

move

horizontally

without

hindrance

while

pla-

ying

the

record.

After

moving

the

tonearm

(by

hand)

to

the

desired

spot

on

the

record

the

tonearm

lift

handle

is

tapped

lightly

(to

the

rear)

to

release

the

mechanism,

The

positioning

slide

(219)

is

thus

relea-

sed

and

the

tonearm

descends

slowly,

con-

trolled

by

the

viscosity

damped

lift

pin.

The

height

of

the

stylus

above

the

record

can

be

varied

from

zero

to

6

mm

by

turning

adjuster

screw

(48).

Turning

to

the

right

increases

the

height,

turning

to

the

left

reduces

the

height.

227

49

219

216

48

241

237

Trouble

Tonearm

misses

edge

of

record

Tonearm

strikes

re-

cord

during

change

cycle

Tonearm

does

not

move

onto

record

when

drop

cycle

is

started

Tonearm

lowers

too

quickly

when

drop

cycle

is

started

Tonearm

returns

to

rest

immediately

af-

ter

being

placed

on

record

manually

Start

Cycle

Cause

a)

Record

setting

incorrect

b)

Set-down

point

incorrectly

ad-

justed

c)

Record

not

stan-

dard

size

d)

Friction

surfaces

of

tonearm

clutch

dirty

Tonearm

height

ad-

justment

incorrectly

set

Excessive

damping

caused

by

dirt

in

si-

licone

oil

in

lift

tube

Insufficient

damping

caused

by

improper

addition

of

lubricant

to

damping

compound

Shut-off

mechanism

has

shifted

out

of

position

during

shipping

Moving

the

start

switch

(44)

causes

change

lever

(189)

to

rotate

outwards.

This

ini-

tiates

the

following

functions:

a)

A

lug

rotates

shift

arm

(187).

The

lat-

ter

in

turn

by

means

of

a

tension

spring

moves

the

change

lever

(130)

and

thus

the

idler

wheel

(150)

into

engagement

with

motor

pulley

(113)

and

platter

(12).

At

the

same

time

the

power

switch

(140)

is

actuated

by

the

switch

slide

(181)

coupled

to

the

shift

arm

and

the

platter

starts

to

rotate,

b)

Change

lever

(189)

is

brought

within

reach

of

the

cam

follower

lever

(166)

so

that

the

letter

is

pushed

into

the

chan-

ge

position

after

subsequent

rotation

of

the

main

cam,

Remedy

a)

Carry

out

necessary

adjustment

by

means

of

right-hand

selector

lever

(44).

b)

Set

right-hand

selector

lever

to

"45",

With

a

screwdriver

inserted

through

the

hole

exposed

turn

eccentric

until

the

tonearm

sets down

approximately

1.5

mm

from

the

edge

of

the

record.

(Ad-

justment

is

only

carried

out

for

7"

re-

cords

and

is

then

automatically

correct

for

12"

records).

c)

Use

standard

record

d)

Clean

clutch

surfaces

Adjust

arm

height

with

adjuster

sleeve

(48).

Height

is

correct

when

stylus

tip

is 2

-

3

mm

above

selector

lever

(44)

when

arm

is

remo-

ved

from

rest.

Remove

tonearm

complete

with

bearing

assem-

bly

(described

on

page

6).

Remove

lock

washer

(67),

detach

adjuster

(68)

sleever

and

remove

second

lock

washer

(67).

Remove

lock

washer

(224)

on

adjuster

lever

(221).

Detach

posi-

tioning

slide

from

on

adjuster

lever,

turn

slightly

until

lift

(241)

is

relea-

sed.

Remove

lift

pin.

Clean

lift

tube

and

lift

pin.

Smear

lift

evenly

with

"Wacker

silicone

oil

AK

500

O00".

Reassemble

compo-

nents.

Remove

tonearm

complete

with

bearing

assembly

paegon

ee

on

page

6).

Remove

lock

washer

67),

detach

adjuster

sleever

and

remove

se-

cond

lock

washer

(67).

Remove

lock

washer

(224)

on

adjuster

lever

(221).

Detach

posi-

tioning

slide

from

on

adjuster

lever,

turn

slightly

until

lift

(241)

is

rele-

ased.

Remove

lift

pin.

Clean

lift tube

and

Lift

pin.

Smear

lift

evenly

with

"Wacker

silicone

oil

AK

500

O00".

Reassemble

com-

ponents.

Before

using

changer

after

moving,

run

it

through

start

cycle

with

tonearm

locked

on

rest

(selector

moved

to

"start").

Fig.

12

Start

position

198

173

161

219

187

189

211

221

«#194

Fig.

13

Stop

position

Fig.

14

Muting

Switch

Cam

wheel

at

zero:

Contacts

of

muting

switch

opened

Cam

wheel

is

turning:

Contacts

of

muting

switch

is

closed

10

Moving

the

operating

switch

(44)

also

re-

leases

the

start

level

(185)

which

is

pul-

led

towards

the

main

cam

by

means

of

ten-

sion

spring

(184).

By

this

means

the

shut-

off

lever

?188)

is

moved

within

the

range

of

the

dog

on

the

platter

pinion

thus

dri-

ving

the

main

cam.

The

change

lever

(189)

is

also

locked.

To

prevent

‘malfunctions

the

operating

switch

is

locked

in

position

du-

ring

the

start

cycle

(rotation

of

the

main

any:

Just

before

the

main

cam

reaches

neu-

tral

position

(at

the and

of

the

change

cy-

cle)

the

start

lever

is

pushed

clear

by

the

main

cam

and

thus

the

operating

switch

and

change

lever

are

returned

to

their

original

positions.

After

installation

and

after

mo-

ving

the

changer

the

unit

should

be

started

with

the

tonearm

locked

on

the

rest.

This

will

automatically

readjust

the

shut-off

lever

which

may

have

shifted

out

of

posi-

tion.

Manual

Start

When

the

tonearm

is

swung

inwards

by

hand

the

pawl

(203)

on

the

shift

arm

(187)

en-

gages

on

a

square

end

fitted

in

the

chassis,

retaining

the

shift

arm

in

this

position

and

thus

the

idler

wheel

(150)

in

engagement

with

the

platter.

The

slide

(181)

linked

to

the

shift

arm

actuates

the

power

switch

and

sets

the

plat-

ter

in

motion.

On

reaching

the

run-out

groove

the

tonearm

automatically

returns

to

its

rest

position

and the

unit

shuts

itself

off.

If,

however,

the

tonearm

is

lifted

off

the

record

before

completion

of

play

and

returned

to

the

rest,

the

of

segment

(237)

releasses

the

pawl

(203).

The

tension

spring

(188)

then

returns

the

shift

arm

to

its

initial

position,

ope-

ning

the

power

switch

and

disengaging

the

idler

wheel.

Stop

Switching

When

the.

operating

lever

is

moved

to

"stop"

only

the

starting

lever

(185)

is

drawn

for-

ward.

As

a

result,

the

shut-off

linkage

en-

gages

with

the

main

cam.

The

cam

follower

lever

(166)

remains

in

stop

position.

When

the

tonearm

is

on

its

rest

and

the

opera-

ting

lever

is

pushed

to

"stop",

the

change

lever

should

not

jam.

Muting switch

Fig.

15

Record

Drop

To

prevent

disturbing

noise

during

the

chan-

ge

cycle

and

during

automatic

operation

of

the

tonearm

the

unit

is

fitted

with

a

mu-

ting

switch.

Control

of

the

switch

springs

for

both

channels

is

effected

by

the

main

cam.

With

the

unit

in

position

of

rest

the

muting

switch

is

opened.

'

|

174

177

45

A

161

187

173

203

29

237

Record

Drop

Insert

the

appropriate

spindle

—

AW

3

for

standard

records

(7

mm

center

hole)

or

AS

12

for

45

rpm

records

(38

mm

center

hole).

Record

drop

is

initiated

by

rotation

of

the

main

cam

ei

whose

cam

surface

guides

the

cam

rocker

(A)

and

the

change

actuator

stud

(177).

The

resultant

downward

movement

ini-

tiates

record

drop

vis

the

changing

spindle

or

automatic

spindle.

The

record

drop

cam

is

located

on

the

main

cam

so

that

record

drop

can

only

take

place

. .

when

the

tonearm

is

over

the

tonearm

rest,

Fig.

16

Actuating

"change"

or

"shut-off"

what

is

to

say,

out

of

reach

of

the

largest

possible

records

(12"

diameter).

Shut

-

off

and

Change

Cycle

The

dog

(M)

of

platter

pinion

(PR)

and

shut-

off

lever

(158)

actuate

both

the

change

cycle

at

the

end

of

the

record

and

shutoff

after

the

last

record

in

a

stack

is

played.

At

the

end

of

a

record

the

tonearm

moves

towards

the

center

at

an

accelerated

rate

due

to

the

increased

pitch

of

the

grooves.

This

motion

carries

shut-off

lever

(158)

to-

wards

the

dog

by

means

of

shut-off

slide

(198).

The

eccentric

dog

pushes

the

shut-off

lever

(158)

back

at

each

revolution

as

long

as

the

tonearm

advance

is

only

one

normal

record

groove

(Fig.

16

a).

The

run-out

groove

with

its

steeper

pitch

moves

the

shut-off

lever

(158)

against

the

dog

with

greater

force

so

that

the

shut-off

eu

is

picked

up

and

moves

with

it.

(Fig.

16

b).

The

main

cam

(161)

is

thus

moved

out

of

its

neutral

position

into

engagement

with

the

pinion

of

the

platter.

(Fig.

16

c).

PR

M_

161

159

158

198

11

Fig.

17

18

19

Change

Cycle

12

Shut-off

Mechanism

The

shut-off

and

change

functions

are

de-

termined

by

the

position

of

the

cam

follower

lever

(166).

After

every

start

or

record

drop

the

cam

follower

lever

(166)

is

moved

to

stop

position

by

main

lever

(173)

(longer

end

of

the

cam

follower

lever

towards

the

center

of

the

main

cam).

As

the

record

is

dropped

the

cam

follower

lever

(166)

is

turned

to

start

position

by

cam

rocker

(A)

so

that

the

tonearm

can

swing

in

after

record

drop

and

be

lowered

onto

it.

If

there

are

no

more

records

on

the

spindle

its

downward movement

is

locked

and the

cam

rocker cannot

turn

the

cam

follower

lever,

the

lever

remains

in

stop

position

and

cau-

ses

the

tonearm

to

lower

onto

its

rest.

When

main

cam

(161)

returns

to

neutral

posi-

tion

the

lug

of

shift

arm

(187)

is

able

to

move

into

the

recess

provided

in

the

main

cam,

actuate

power

switch

(140)

and

disenga-

ge

idler wheel

(150).

Trouble

Platter

stops

after

automatic

set-—down

of

tonearm

Cause

5

Shift

arm

(187)

not

locked

by

pawl

(203).

b)

Power

switch

has

interrupted

power

sup—

ply

(has

switched

off).

Remedy

s

By

turning

the

eccentric

on

the

paul

b)

By

adjusting

switch

slide

(181)

maximum

play

between

suitch

slide

and

shift

arm

(0.3

mm).

Trouble

The

last

record

of

a

stack

keeps

repeating

Cause

Defective

spindle

Remedy

Replace

spindle

Trouble

Fig.

20

After

adjustment

of

the

tonearm

set-down

point

for

7"

records

the

set-down

point

for

12"

records

is

incorrect.

Cause

Eccentric

(E)

of

adjuster

lever

(221)

out

of

adjustment.

Remedy

Adjust

tonearm

set-down

point

by

turning

eccentric

(E).

Fig.

21

Trouble

Record

drops

when

unit

is

switched

to

"stop"

Cause

Cam

rocker

(A)

not

locked

by

change

lever.

Remedy

Adjust

change

lever

so

that

it

passes

ap-

proximately

1.5

mm

underneath

the

cam

rocker

when

"stop"

function

is

initiated.

Fig.

22

Trouble

Records

do

not

drop.

Cause

Cam

rocker

has

insufficient

travel.

Remedy

Adjust

travel

with

eccentric

screw

on

cam

rocker.

Adjustment

is

correct

when,

with

the

main

cam

in

neutral

position

and

the

changing

spindle

locked,

the

three

supports

of

the

changing

spindle

describe

longitu-

dinal

movement

of

0.2

mm

when

the

change

actuator

stud

is

pushed

up.

13

Trouble

Vertical

tonearm

mo-

vement

restricted

du-

ring

set-down

cycle

Tonearm

moves

with

stylus

pressure

and

anti-skating

scale

in

zero

position

a)

out-

wards,

b)

inwards

During

change,

start

and

stop

operations,

noise

from

the

me-

chanism

can

be

heard

in

speaker

system

No

sound.

The

short

circuit

of

the

pick-

up

leads

is

no

lon-

ger

broken

Motor

will

not

shut

off

when

tonearm

is

on

arm

rest

Acoustic

feedback

Trouble

Tonearm

is

hindered

in

during

change

cycle.

Cause

a)

Excessive

bearing

friction

b)

Lift

sticks

in

lift

tube

a)

Anti-skating

device

out

of

adjustment

b)

Excessively

taut

to-

nearm

leads

produc

ting

torque

Muting

switch

malad-

justed.

Clearance

be-

tween

contact

strips

on

muting

switch

ex-

cessive

Clearance

between

wi-

pere

and

contact

strips

absent

or

insufficient

Suppression

capaci-

tor

(in

power

switch)

is

defective

(short

circuit)

a)

Chassis

parts

(e.g.

connection

leads)

are

tou-

ching

base

cutout.

b)

Connecting

leads

are

too

taut

its

horizontal

motion

Positioning

socket

or

positioning

screw

mi-

sad

justed.

Remedy

Move

tonearm

over

operating

lever

(44)

and

turn

the

positioning

socket

(68)

until

the

clearance

between

stylus

tip

and

operating

lever

is

approximately

2

-

3

mm.

Rotate

cam

(161)

away

from

its

neutral

posi-

tion

until

main

lever

(173)

lifts

the

tone-

arm

completely.

Swing

the

tonearm

over

its

rest

and

adjust

screw

(57)

so

that

between

pimpel

(66)

and

the

resting

surface

of

the

tonearm

there

is

a

play

of

approximately

0.1

mm.

(0.5

mm

measu-

red

at

tonearm

head).

This

play

must

be

maintained

over

the

en-

tire

horizontal

swing.

Remedy

a)

Eliminate

friction

by

adjustment

of

bea-

ring

screw

(setscrew

41)

and

check

balance.

b)

Remove

lift

and

clean

(described

on

page

9)

a)

Adjust

skating

lever

so

that

skating

spring

acts

correctly

at

tonearm

pivot.

b)

Slacken

tonearm

leads.

By

bending

contact

strips.

Adjustment

is

correct

when,

with

the

main

cam

in

neutral

position,

the

gap

between

the

wipers

and

the

contact

strips

on

the

muting

switch

is

approximately

0.5

mm.

Spray

contact

springs

with

preservative

(e.g.

Kontakt

61)

and

check

adjustment

of

contact

strips.

By

adjusting

contact

strips.

Adjustment

is

correct

when,

with

the

main

cam

in

neutral

position,

the

gap

between

the

wipers

and

the

contact

strips

on

the

muting

switch

is

approximately

0.5

mm,

Renew

suppression

capacitor

in

power

switch

a)

Correct

cutout

according

to

instructions

supplied

with

unit.

Move

leads.

b)

Slacken

or

extend

leads

Fig.

23

Replacement

Parts

|

pos.

|

ert.-uo.

|

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bushes.

Lubricants

should

be

applied

sparingly

to

bearing

points

and

friction

surfaces.

It

is

important

that

no

oil

or

grease

should.

come

in

contact

with

the

friction

faces

of

the

idler

wheel,

motor

pulley

and

platter

as

otherwise

slip

will

occur.

Avoid

touching

these

parts

for

the

same

reason.

When

lubricants

of

different

types

are

mixed,

chemical

decomposition

frequently

occurs,

To

avoid

complications

with

lubricants

we

recommend

using

the

original

lubricants

listed

below.

The

following

lubricants

should

be

used:

Renotac

No.

342

adhesive

oil

BP

Super

Viscostatic

10

U/30

Shell

Alvania

No.

2

Isoflex

PDP

40

Silicone

oil

AK

500 000

Molykote

PPPP

RD

20

Alterations

reserved

Dual 1226 User manual

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