Telefunken M 204 E - Component Assemblies and Construction; Feed Plate, Switch;Jack Bracket, and Take-Up Plate Assemblies; Engagement Plates Mechanism

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To

fold

out the

amplifier

board

Screw

out

the

four

retaining

screws

of

the

amplifier

board

(at

the

yellow

triangular

spacers).

Fold

out

the

amplifier

board.

To

take

out

the

output

stage

assembly

Screw

out

the

three

retaining

screws

of

the

printed

circuit

board

(in

the

black

triangular

spacers)

and

the

two

fixing

screws

of

the

cooling

fin.

Take

out

the

assembly.

To

take

off

the

head

covering

Using

both

hands,

press

downwards

the

sidewings

of

the

head

covering

close

above

the

coverplate,

and

pull

off

the

head

covering

forwards.

To

take

off

the

coverplate

Pull

off

the

six

control

knobs

and

the

knob

of

the

function

selector

switch

forwards,

and

pull

off

the

rectangular

knob

of

the

tape

speed

selector

in

the

direction

of

the

changeover

lever.

The

coverplate

can

then

be

taken

off

after

releasing

the

six

cross-slot

screws.

Six-Jack

Bracket

Screw

out

four

screws

in

the

chassis

from

the

front.

Fold

out

the

jacks

bracket

(it

is

not

necessary

to

take

off

the

mask).

Feed

Plate

Assembly

(on

left,

looking

onto

chassis)

The

components

are

listed

in

order,

commencing

at

the

bottom

as

seen

looking

onto

the

chassis:

—

Slider

for

elevation

adjustment

of

the

feed

plate

Profile

block

to

compensate

the

inclined

plane

of

the

slider

Plastic

washer

Lockwasher,

bronze

washer

and

star

spring

Supporting

plate

Lockwasher,

bronze

washer

and

star

spring

Brake

plate

with

felt

lining

Slip

plate

with

felt

lining

and

injected

bushing

with

bearing

Plastic

washer,

bronze

washer

and

tension

ring

Engagement

plate

Switch

and

Jack

Bracket

Screw

out

two

screws

from

the

rear

side

of

the

chassis,

release

the

anchorage

of

the

mains

cable,

pull

out

the

jacks

bracket

through

a

small

distance

and

turn

through

180°.

The

wiring

is

then

accessible.

Construction

and

Functional

Principles

The

complete

mechanism

of

the

magnetophon

204

is

built

on

a

sheet

metal

chassis

which

is

screwed

to

the

wooden

cabinet

frame.

Engagement

Plates

The

engagement

plates

engage

with

their

three

latching

pegs

into

the

bayonet

slots

of

the

slip

plates.

They

should

be

engaged

by

turning

towards

the

magnetic

heads.

To

disengage

them,

turn

in

the

other

direction,

but

not

too

far

since

otherwise

the

plates

latch

again.

To

latch

or

unlatch

the

plates,

hold

the

slip

plate

and

engage

or

release

the

engagement

plate

with

the

help

of

a

small

tape

reel.

The

tension

ring

below

the

engagement

plate

should

be

mounted

with

a

play

of

0.2

to

0.3

mm

with

respect

to

the

slip

plate.

Take-Up

Plate

Assembly

(on

right,

loocking

onto

chassis)

The

components

are

listed

in

order,

commencing

at

the

bottom

as

seen

looking

onto

the

chassis:

—

Slider

for

elevation

adjustment

of

the

take-up

plate

Profile

block

to

compensate

the

inclined

plane

of

the

slider

Plastic

washer

Lockwasher,

bronze

washer

and

three

star

springs

Supporting

plate

Lockwasher,

bronze

washer

and

one

star

spring

Brake

plate with

felt

lining

Slip

plate

with

felt

lining

and

injected

bushing

with

bearing

Plastic

washer,

bronze

washer

and

tension

ring

Engagement

plate

Fig.

2

Exploded

drawing

of

feed

plate

(left)

Fig.

3

Exploded

drawing

of

the

take-up

plate

(right)

ay

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