Thorens Td 125 User manual

INSTRUCTION

MANUAL

THORENS

TD

125

Contents

Page

1,

INTRODUCTION

3

2,

OPERATION

SUMMARY

4

3,

UNPACKING

6

4,

MOUNTING

7

TONE

ARM

AND

PICK

UP

"1

.

OPERATION

18

oa

.

THE

SOLID

STATE

CONTROL

SYSTEM

AND

HOW

IT

WORKS

18

|.

MAINTENANCE

19

1.

INTRODUCTION

The

turntable

TD

125

is

an

electronic

precision

instru-

ment

which

will

guarantee

the

best

results

in

record

reproduction

when

handled

carefully.

In

order

to

protect

the

instrument

and

your

precious

records,

the

ope-

ration

should

not

be

learned

by

experimenting

but

by

careful

reading

of

this

instruction

manual.

The

Hi-Fi

enthusi

and

the

expert

will

find

in

the

following

chapters

all

the

necessary

information

for

the

application

of

the

transcription

turntable

as

@

pro-

gramme

source

in

high

quality

Hi-Fi

equipment

and

for

its

use

in

the

professional

field.

2.

OPERATION

SUMMARY

21.

Connect

the

turntable

to

the

AC

mains

power

supply.

Check

for

the

correct

voltage.

2.2.

The

slide

button

in

the

centre

of

the

contro!

pan-

el

Q

is

the

AC

mains

on/off

switch.

Position

left:

"OFF"

Position

right:

“ON™

2.3.

The

left

hand

slide

ber

@

is

the

speed

selector

which

controls

the

3

speeds

available.

In

the

left

hand

Position

it

is

16

*/s

RPM.

Centre

position

33

"/s

RPM

and

right

hand

position

45

RPM,

24.

In

front

of

the

lighted

stroboscope

window

@

is

the

knurled

wheel

@

for

the

pitch

control.

Moved

to

the

left:

turntable

runs

faster

Moved

to

the

right:

turntable

runs

slower

For

the

exact

turntable

speed

it

has

to

be

adjusted

so

that

the

stroboscope

pattern

©

seems

to

stand

still

2.5

The

adaptor

in

the

centre

of

the

turntable

platter

©

may

be

turned

over

for

adjustment

in

order

to

play

records

with

either

large

or

small

centre

hole.

26.

Tone

Position

le

Position

right:

play

3.

UNPACKING

Place

the

carton

top

side

up

and

open.

Remove

the

outer

12°

turntable

platter

and

its

rubber

mat.

After

installing

the

unit

carefully

centre

the

outer

turntable

platter

on

the

inner

turntable

platter

with

the

rubber

mat

on

top.

After

removing

the

upper

part

of

the

foam

plastic,

the

turntable

may

be

removed

from

the

carton

The

accessories

are

stored

beneath

the

turntable.

Take

the

complete

unit

out

of

the

foam

plastic

bottom

part

and

put

it

down

on

a

fiat

surface.

Remove

the

spacer

between

the

suspended

chassis

and

control

panel.

Attention:

Save

the

complete

packing.

Shipping

the

turntable

without

this

could

cause

serious

damage.

4,

MOUNTING

4.1.

Mounting

the

turntable

on

a

base

For

the

TD

1258

and

TD

125

AB

version,

this

chapter

is

not

applicable,

Remove

the

outer

turntable

platter

before

proceeding

to

mount

the

unit,

If

the

turntable

is

to

be

operated

free

standing

outside

of

furniture

it

has

to

be

mounted

into

a

base

No

ST

509

or

equivalent.

The

chassis

must

be

fastened

from

underneath

with

the

4

screws

which

ere

supplied

with

the

turntable.

8

of

the

base

do

not

fit

to

the

turntable-

icken

screws

@.

Then

the

thread-bars

can

be

moved

according

to

the

holes

in

the

base.

4.2.

Mounting

the

turntable

Into

furniture

The

TD

125

turntable

should

be

mounted

on

a

ply-wood

mounting

board

of

not

less

than

#/s

inch

thickne:

‘cut

out

according

to

the

template

X

830-2.

This

.

rectangular

hole

with

the

dimensions

451

x

341

mm

(17.75

x

13.42").

In

this

hole

the

mounting

frame

CE

509

fits

without

further

fastening.

The

turntable

chassis

TD

125

is

fastened

into

the

mounting

frame

as

de-

scribed

under

4.1

In

order

to

ensure

efficient

operation

of

the

floating

‘suspension

it

is

essential

when

fitting

the

unit

to

allow

it

clearance

between

the

die

cast

chassis

and

inting

board.

3.

Levelling

of

Unit

The

turntable

should

be

levelled

after

mounting

the

tone

arm

by

adjusting

the

three

knurled

levelling

knobs

®.

Turning

clockwise

raises

and

counterclockwise

lowers.

Check

to

make

sure

that

after

adjustment

Unit

is

floating

freely.

7

4.4.

Assembling

of

longer

length

tone

arms

The

TD

125

is

supplied

ting

board

to

accommodate

9°

(Brit

(American

Standard)

tone

arms.

The

turntable

TD

125

may

be

equipped

with

a

longer

tone

arm.

For

the

purpose

a

conversion

kit

JP

512

Is

ailable.

It

consists

of

@

larger

tone

arm

mounting

board

and

a

longer

control

panel.

For

this

conversion,

follows:

—

after

unscrewing

the

3

sock

1d

screws

remove

the

standard

tone

arm

mour

ting

board.

—

Remove

outer

and

inner

turntable

plat-

ters.

—

Loosen

earth

connection

(cable)

between

upper

id

lower

chi

Unscrew

the

3

knurled

nuts

@

and

remove

the

washers

below.

—

Remove

the

upper

die

cast

chassis,

taking

care

not

to

lose

any

part

of

the

spring

suspension

of

this

chassis.

—

Unscrew

the

fastening

screws

of

the

slide

buttons

®

and

remove

the

buttons.

—

Unscrew

the

3

screws

maintaining

the

control

panel

which

become

accessible

after

removal

of

the

die

cast

chassis.

—

Remove

the

standard

control

panel.

For

assembling

the

longer

control

panel

and

the

larger

tonearm

mounting

board,

proceed

accordingly

in

re

erse

sequence.

The

conversion

enlarges

the

turntable

by

75

mm

(2.957),

This

also

requires

the

longer

base

No

ST

512.

ish

Standard)

12

4.5.

TD

125

with

stiff

suspension

A

In

some

special

cases,

for

example

for

discotheque

use,

it

can

be

of

advantage

to

suppress

the

resilient

sus-

pension

of

the

die

cast

chassis

of

the

TD

125,

although

this

operation

results

in

a

slightly

higher

rumble

level.

For

this

conversion,

proceed

as

follows:

—

Unscrew

each

one

of

the

3

knurled

knobs

®

of

the

die

cast

10

chassis

suspension,

one

at a

time,

and

remove

the

spring

below.

—

In

place

of

the

spring

introduce

the

special

rubber

grommet

(please

order

separately

No.

CB

908)

and

insert

the

knurled

knob

upside-down.

—

Beware

to

unscrew

only

one

knurled

knob

at

a

time!

5.

TONE

ARM

AND

PICK

UP

The

tone

arm

mounting

board

has

to

be

removed

by

unscrewing

the

3

socket

headed

screws

with

the

Allen

key

supplied.

The

tone

arm

should

be

mounted

on

the

board

in

accordance

with

the

manufacturers

re-

commended

procedure

and

the

template

supplied.

Connect

earth

of

the

tone

arm

to

the

chassis

screw

@.

The

Thorens

TP

25

tone

arm

has

been

designed

to

per-

fectly

match

the

standards

of

the

TD

125

turntable

and

it

will

therefore

give

you

optimum

performances.

Moreover

the

lowering

device,

operated

from

the

rigid

front

panel

by

means

of

an

additional

slide

bar,

greatly

facilitates

its

use.

5.1.

Cartridge

installation

The

TP

50

plug-in

shell

offers

enough

s

necessary

mounting

hardware

to

suit

any

standard

pick-up

cartridge

('/2"

hole

distance).

Making

use

of

the

hardware

supplied

—

washers,

spacers

ond

screws

—

mount

the

cartridge

in

a

way

to

bring

the

stylus

tip

at

a

distance

of

1/1"

to

7/«"

(19—21

mm)

from

the

bottom

of

the

shell.

Fig.

3.

Attention!

It

is

essential

that

only

the

metrical

M2

screws

supplied

with

the

TP

50

shell

be

used.

The

screws

delivered

with

several

cartridges

have

a

Whitworth

thread

and

they

will

not

fit

the

metric

threads

used

on

Thorens

units.

"1

5.2.

Cartridge

alignment

The

TP

50

plug-in

shell

allows

to

adjust

first

the

vertical

tracking

angle

and

then

the

stylus

overhang

for

opti-

mum

tracking.

4

15/16"

Fig.3

49mm

5.2.1

Vertical

tracking

angle

Loosen

slightly

the

two

screws

A

on

both

sides

of

the

shell

and

small

screws

8

(see

fig.

3)

Insert

the

shell

plug

in

the

arm

socket,

allowing

the

location

pin

to

enter

the

slot.

Press

inward

and

tighten

the

locking

nut

firmly

but

not

more

than

necessary.

This

operation

is

best

performed

when

the

arm

is

clamped

in

the

arm

rest.

Bring

the

tone

arm

over

a

record

(caution:

take

a

worn

record)

and

adjust

the

vertical

tracking

angle

according

to

the

instructions

of

the

cartridge

manufacturer,

in

turning

the

shell

on

tt

termined

by

the

two

screws

A.

Do

not

force

the

shell

into

position,

due

to

the

extra-light

design

this

could

lead

to

serious

damages.

12

For

15°

cartridges,

the

proper

vertical

tracking

angle

is

obtained

when

the

upper

surface

of

the

plug-in

shell

's

horizontal

Make

sure

that

the

rear

of

the

shell

or

of

the

cartridge

cannot

contact

a

warped

record.

If

necessary,

increase

the

vertical

distance

between

the

stylus

tip

and

the

bottom

of

the

shell

with

the

help

of

spacers

(see

fig.

3).

At

last

tighten

smail

set

screws

B.

Due

to

this

special

adjustment

it

is

possible

to

obtain

a

15*

vertical

tracking

angle

also

for

a

number

of

older

cartridges

which

were

not

manufactured

ac-

cording

to

the

present

international

standards.

5.2.2

Stylus

overhang

The

optimum

distance

of

230

mm

between

stylus

tip

and

vertical

tone

arm

bearing

is

obtained

when

the

stylus

tip

is

at

a

distence

of

49

mm

from

the

rear

vertical

surface

of

the

plug-in

shell

(see

fig.

3)

Tighten

the

two

screws

A.

5.3.

Cartridge

connection

Four

separate

colour

coded

leads

are

already

soldered

to

the

terminal

pins

in

the

shell:

Red

——

Right

channel

positive

(hot)

Green

—

Right

channel

negative

(shield)

These

two

leads

constitute

also

the

mono

channel.

White

—

Left

channel

positive

(not)

Blue

—

Left

channel

negative

(shield)

4.

Assembling

the

counterweight

As

a

precaution

against

damage

in

transit,

the

counter-

weight

is

packed

separately,

already

threaded

on

the

removable

back

tubular

part

of

the

arm

with

the

set

screw.

Slide

the

back

tubular

part

with

the

counterweight

‘onto

the

pick-up

arm

extension

and

lock

it

in

position

with

set

screw.

For

balancing

the

arm

move

the

stylus

force

adjustment

lever

back

as

far

as

possible

to

the

abutment

of

the

lower

end

of

the

scale.

Move

the

lowering

device

slide

bar

to

the

“play”

position.

Position

the

arm

80

that

the

stylus

tip

is

between

the

arm

rest

and

the

turntable

platter.

Turn

the

counterweight

with

the

right

hand,

while

main-

taining

the

lateral

position

of

the

arm

with

the

left

hand

to

avoid

damaging

the

stylus,

until

the

arm

assumes

a

horizontal

position,

i.e.

the

stylus

is

at

record

surface

level.

5.5.

Stylus

force

adjustment

After

balance

of

the

tone

arm

has

been

achieved,

slide

the

stylus

force

lever

to

the

prescribed

weight

on

the

stylus

force

scale

as

recommended

by

the

cartridge

manufacturer.

Fig.

4.

Stylus

force

adjustment

\

Anti-skating

adjustment",

Fig.

4

5.6.

Anti-skating

adjustment

The

setting

of

the

anti-skating

force

depends

mainly

on

the

applied

stylus

pressure.

At

the

TP

25

tone

arm

it

can

be

adjusted

by

fixing

the

nylon

thread

which

is

led

through

a

hole

in

the

tone

arm

mounting

board

in

one

of

the

three

different

notches.

The

highest

anti-skating

force

is

applied

when

the

nylon

thread

hangs

in

the

outer

notch.

Furthermore,

the

force

can

be

decreased

by

un-

screwing

the

lower

part

of

the

antiskating

weight.

13

The

correct

anti-skating

force

necessary

for

a

particular

cartridge

can

be

determined

by

means

of

a

test

record

which

incorporates

a

tracking

test,

for

instance

CBS

no.

STR.

111.

Whilst

playing

this

part

of

the

record,

at

first

without

anti-skating

force,

reduce

the

stylus

force

until

distortion

becomes

audible.

Normally

it

is

first

audible

in

the

right

channel

and

upon

a

further

reduction

of

the

stylus

force,

in

the

left

channel.

Adjust

the

anti-skating

devi

the

stylus

force

back

to

@

distortion

free

reproduc-

@

value

which

guerante

tion

kating

fore

means

of

the

groov

records.

When

piaying

this

part

of

the

record

the

nylon

thread

should

be

adjusted

in

such

a

way

that

the

tone

arm

does

neither

move

to

the

center

nor

the

outer

edge

of

the

test

record.

olso

be

determined

by

8

part

of

some

other

test

If

such

test

records

are

not

available

the

adjustment

can

be do

Stylus

force

1_—1.5

grams

inside

15—2

grams

middle

2

—4

grams

outside

4

5.7.

Pick-up

output

connections

The

tone

arm

is

wired

in

the

factory

according

to

Fig.

5.

Right

channel:

stendard

male

phonoconnector

plug,

black

colour.

Left

channe!

white

colour.

standard

male

phonoconnector

plug,

[)

.

left

channe!

right

ehanne:

Al

|

c+--—4

Fig.

5

Ground

connection:

—

The

unit

plate

ond

the

metal

part

of

the

arm

are

connected

at

A

to

the

shield

of

the

right

channel

cable

acting

as

@

ground

lead.

—

The

shield

of

the

left

channel

cable

is

insulated

from

the

base

plate

of

tho

turntable

and

from

the

metal

parts

of

the

arm.

The

spring

mounted

parts

of

the

turntable

are

connect

ed

to

the

fixed

unit

plate

by

ground

lead

D.

Lug

E

should

be

fastened

on

the

metal

frame

by

the

corre-

sponding

set

screw

of

the

pick-up

wooden

board.

lf

necessary

for

particular

cartridges

or

amplifiers,

two

different

wiring

systems

may

be

easily

realized:

3

wire

system

Connect

lugs

3

and

4

on

the

terminal

strip

with

a

wire

B;

the

shields

of

both

channels

are

thus

connected

together

and

to

the

unit

plate

5

wire

system.

When

the

ground

for

the

turntable

cannot

be

returned

to

the

amplifier

ground

through

the

signal

carrying

shieldings,

the

wire

connecting

lugs

t

and

3

should

be

cut

at

A

and

a

separate

insulated

wire

C

connected

from

lug

1

to

the

common

grounding

point

for

the

amplifiers.

6.

OPERATION

6.1.

AC

Mains

power

supply

connection

The

turntable

TD

125

may

be

operated

at

any

AC

mains

power

supply.

For

voltages

between

210 and

240

V

the

small

fuse

5x20

mm,

100

mA,

slow-blow

has

to

be

attached

to

the

fitting

fuse

holders.

For

voltages

between

110

and

130

the

large fuse

6

x

32

mm,

200

mA,

slow-blow

has

to

be

attached

to

the

respective

fuse

holder,

The

fuse

holders

are

easily

accessible

after

removal

of

the

protective

cap

@.

Before

changing

the

fuse

don't

forget

to

disconnect

the

unit

from

the

mains!

(ai

Fig.

Due

to

the

electronic

speed

control

of

the

TD

125

turn-

table

an

electrical

adjustment

to

different

AC

mains

power

supply

frequencies

(50

or

60

Hz)

is

not

neces-

sary.

For

the

adjustment

of

the

stroboscope

illumina-

tion

see

paragraph

64.

15

6.2.

AC

Mains

power

supply

switch

The

slide

bar

©

on

the

control

panel

has

two

positions:

Left

position:

OFF

Right

position:

ON

The

synchronous

motor

is

controlled

by

the

solid

state

control

system.

There

is

a

built

in

automatic

overload

protective

circuit.

Therefore

no

damage

will

occur

if

the

turntable

platter

is

stopped

by

hand

when

the

power

is

on,

16

6.3.

Speed

selector

The

slide

bar

on

the

left

hand

side

of

the

contro!

panel

@

is

the

speed

selector

for

the

three

speeds

16

#/s,

33

'/s

and

45

RPM.

It-can

be

operated

at

any

time

whether

power

is

on

or

off.

The

fine

speed

adjustment

is

made

by

the red

knurled

whee!

@

in

front

of

the

illuminated

stroboscope

window

@,

The

turntable

speed

is

increased

when

the

knurled

wheel

is

moved

to

the

left

and

decres

moved

to

the

right

When

the

appropriate

stroboscope

pattern

the

following

record

speeds

will

be

obt

following

mains

frequen!

At 50

Hz

45.11

RPM

and

33.33

RPM

‘At

60

Hz

45.00

RPM

and

33.33

RPM

When

using

the

162/

RPM

speed,

correct

speed

will

be

indicated

by

the

33

'/s

stroboscope

pattern.

6.4.

Stroboscope

adjustment

for

different

AC

mains

power

supply

frequencies

The

TD

125 turntable

can

be

operated

without

fre-

quency

adjustment

at

50

and

60 Hz

(USA,

Canada)

AC

mains

power

supply.

(Make

sure

that

the

correct

fuse,

corresponding

to

the

AC

mains

power

supply

voltage

is

installed,

see

paragraph

6.1.)

The

stroboscope

illumination

has

to

be

changed

when

‘operating

the

turntable

at

another

AC

mains

power

supply

frequency.

This

illumination

has

no

influence

to

the

other

function

of

the

turntable.

For

the

adjust-

ment,

tho

outer

turntable,

the

drive

belt

and

the

inner

turntable

have

to

be

removed.

The

two

screws

(@

in

figure

No.

7)

should

be

loosened

‘one

or

two

turns.

The

neon

lamp

carrier

may

now

be

moved

as

indicated

in

figure

No.7

corresponding

to

the

AC

mains

power

supply

frequency.

After

tightening

the

screws,

fit

the

inner

turntable

platter

into

its

bearing

well

and

replace

the

drive

belt.

The

outer

turntable

platter

is

then

centred

on

the

inner

one.

The

drive

belt

should

be

kept

entirely

free

from

any

trace

of

oil

or

grease

during

this

operation

Fig.

7

7

THE

SOLID

STATE

CONTROL

SYSTEM

AND

HOW

IT

WORKS.

The

TD

125

turntable

is

fitted

with

a

Solid

State

Control

System.

This

replaces

the

mechanical

linkage

which

is

normally

necessary

to

maintain

different

record

speed:

The

Solid

State

Control

Circuit

consists

of

a

transi

The

necessary

power

for

the

synchronous

motor

is

produced

by

a

push-pull

amplification

stage.

To

main-

tain

the

optimum

torque

from

the

motor

at

any

fre-

quency,

a

pair

of

frequency

stepped

switches

are

linked

torized

Wien

bridge

oscillator,

normally

used

in

meas-

turing

instruments,

and

the

frequency

of

this

oscillator

can

be

varied

in

definite

steps

so

that

the

speed

of

the

16

pole

synchronous

motor

can

be

changed.

An

additio-

nal

fine

frequency

adjustment

may

be

effected

by

means

of

a

potentiometer,

thus

providing

an

electronic

speed

control

within

the

range

of

+

2%.

13

Fig.

8

together

thus

providing

different

phase

shift

motor

con-

densers.

The

speed

of

the

synchronous

motor

is

therefore

con-

trolled

by

the

generated

frequency.

The

desired

record

‘speed

will

be

provided

by

the

precise

frequency

varia-

tion

of

the

control

generator.

8.

MAINTENANCE

8.1.

Turntable

The

turntable

bearing

shaft

revolves

in

self-lubricating

bearings.

Under

normal

conditions

lubrication

is

not

necessary

before

several

1000

hours

of

running.

When

lubrication

of

the

turntable

bearing

@

is

necessary

use

exclusively

Caltex

Regal

oil

B

(ROB)

as

supplied

with

our

Lubrication

Kit

available

as

an

accessory

at

your

dealer.

2.

Motor

Due

to

the

slow

operating

speed

of

the

synchronous

iy

under

normal

opera-

motor

no

lubrication

is

ne

ting

conditions.

8.3.

Drive

System

The

belt,

the

motor

pulley

of

oll

or

grease.

If

necessary,

clean

them

with

a

lint

free

cloth

dampened

with

denatured

alcohol

or

methy-

lated

spirits

8.4.

Replacing

the

neon

stroboscope

bulb

Before

doing

this,

DISCONNECT

THE

UNIT

FROM

THE

MAINS.

Remove

the

inner

and

outer

turntable

as

described

in

paragraph

6.4.

The

neon

bulb

is

then

accessible,

located

under

a

cylin-

dricai

lens

at

the

upper

edge

of

the

black

stroboscope

plate.

Fig.

7.

After

unscrewing

both

screws

left

and

right

beneath

the

lens

@,

the

lens

can

be

removed

and

the

neon

buib

replaced.

To

reassemble

the

turntable

proceed

accordingly

in

reverse

sequence.

19

THORENS

WARRANTY

1.

We

warrant

that

we

shail

replace

free

of

charge

every

defective

part

of

this

unit

or

repair

it

free

of

charge

in

our

works

or

in

one

of

our

authorized

service

stations;

in

case

a

defect

should

set

in

within

the

period

of

warranty.

The

warranty

period

is

of

one

year

from

the

date

of

the

original

purchase.

2.

Above

warranty

is

valid

only

if

the

enclosed

warranty

card,

duly

filled,

is

returned

within

10

éays

after

purchase

to

the

Thorens

General

Representative

in

your

country;

his

address

will

be

given

by

your

dealer.

3.

Should

a

defect

set

in

within

the

warranty

poriod,

please

contact

the

Thorens

General

Representative

and

describe

completely

the

defective

operation

and

quote

Model

and

Serial

Number

of

your

unit.

In

simple

cases

the

General

Representative

will

send

you

the

replacement

part.

Otherwise

he

will

give

you

the

address

of

the

nearest

service

station

or

ask

you

to

return

the

complete

unit.

4,

In

the

latter

case,

please

pack

the

unit

in

the

original

packing

‘according

to

the

instructions

of

the

manual.

Shipment

must

be

made

shipping

charges

prepaid.

5.

Any

damage

caused

by

failure

to

observe

the

instructions

contained

in

the

manual,

as

well

as

by

accident

in

transit

or

elsewhere,

will

not

be

covered

by

this

warranty.

6.

The

warranty

expires

if

the

unit

is

being

repaired

or

altered

by

anyone

other

than

a

Thorens

authorized

service

station.

THORENS

—

FRANZ

AG

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