THORENS PC 650 - Tape Transport Mechanism; Transport Operation and Adjustments

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TAPE

TRANSPORT

MECHANISM

2.

Fast

Forward

and

Reverse

Functions

lf

either

the

fast

forward

or

reverse

function

does

not

en-

gage,

check

first

whether

the

rocker

assembly

(Fig.

5)

is

moving

freely.

The

rocker

must

fall

from

its

own

weight

when

the

cassette

deck

is

placed

on

its

side.

If

binding

occurs,

slightly

alter

the

positions

of

the

clip

washers

(four

arrows).

If

the

reel

motor

does

not

start,

refer

to

Section

3.

3.

Reel

Motor:

Drive

Voltage

Test

and

Replacement

le

a)

Unsolder

the

connecting

wires

at

the

reel

motor

(wires

St

06,

St

07).

b)

Solder

a

100

Ohm,

1/2

Watt

resistor

to

the

connecting

wires.

Avoid

chassis

contact!

c)

Depress

and

hold

down

either

the

fast

forward

or

re-

verse

button.

d)

If

the

voltage

measured

on

the

resistor

is

less

than

4.5

VDC,

check

the

performance

of

the

Logic

Control

Board

VM

17

and

the

Power

Control

Board

VM

14

with

reference

to

the

TRANSPORT

FUNCTIONS

description

(Sections

16

and

17).

e)

If

the

voltage

is

at

least

4.5

VDC

and

the

reel

motor

does

not

start,

it

must

be

replaced

according

to

the

following

procedure.

3191415

F

f)

Remove

the

two

cylinder-head

screws

“A”

(Fig.

6)

and

the

two

separators

(3019445)

between

the

rear

of

the

mounting

plate

and

the

reel

drive

aggregate.

g)

Carefully

guide

out

the

reel

drive

aggregate

toward

the

rear.

Avoid

damaging

the

gears.

h)

Demount

the

motor

(3119705)

from

the

reel

drive

aggre-

gate

by

removing

the

two

Phillips

head

screws.

i)

Screw

on

the

replacement

motor.

A

play

of

0,1

mm

is

necessary

between

the

motor

pinion

“C”

and

the

trans-

mission

gear

B”’.

j)

Check

the

free

movement

of

the

rocker

assembly

accord-

ing

to

Section

2.

k)

Carefully

return

the

reel

drive

aggregate

into

its

mounting

position.

The

stop

pin

D’

on

the

aggregate

must

pass

between

the

adjustment

lugs

E”

on

the

mounting

plate.

1)

Mount

the

aggregate

with

the

two

screws

‘A’,

tightening

evenly.

m)Check

the

free

movement

of

the

rocker

assembly

once

again

by

turning

the

pinion

C”

in

alternate

directions.

n)

Solder

the

colored

wire

(St

06)

to

+”

and

the

black/

white

wire

(St

07)

to

the

other

terminal

of

the

motor.

o)

Check

the

height

of

the

head

bracket

(Section

4),

the

tape

tension

(Section

5),

and

the

tape

speed

(Section

6),

adjusting

as

necessary.

Fig.

5

3119705

4.

Head

Bracket

Height

Adjustment

The

height

of

the

head

bracket

influences

the

contact

force

between

the

record/playback

head

and

the

tape.

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