Teac C-3RX - 4 Mechanical Adjustments and Checks; Reel Torque and Pinch Roller Adjustments; Head Base Plate and Capstan Thrust

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C-3RX

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4

MECHANICAL

ADJUSTMENTS

AND

CHECKS

4-1

REEL

TORQUE

1.

Load

the

cassette

torque

meter

on

the

deck

and

read

the

pointer

indication

on

the

dial

scale

for

each

tape

transport

operation.

The

measured

torque

should

be

within

the

following

values:

.

Take-up:

45

to

65

g-cm

(0.62

to

0.90

oz-inch)

Supply:

3

to

8

g-cm

(0.042

to

0.11

oz-inch)

F.F.and

REW:

90

to

160

g-cm

(1.25

to

2.22

0z-inch)

4-2

PINCH

ROLLER

PRESSURE

1.

With

the

cassette

holder

shut

and

no

tape

loaded,

put

the

deck

in

PLAY

mode.

2.

Hook

a

spring

scale

on

the

tap

of

the

pinch

roller

assembly

plate,

as

shown

in

the

illustration.

3.

Pull

the

scale

down

until

there

is

sufficient

force

to

separate

the

pinch

roller

from

the

capstan

shaft.

4.

Ease’

pressure

until

the

pinch

roller

makes

just

enough

contact

with

the

capstan

shaft

so

that

the

pinch

roller

just

begins

to

turn.

At

this

point,

note

the

reading

on

the

scale.

It

should

be

from

390

g

to

490

g

(13.8

oz.

to

17.3

02.)

5.

If

the

pressure

is

not

within

the

prescribed

specifications,

it

may

be

adjusted

by

first

removing

the

pinch

roller

spring

from

the

pinch

roller

assembly

and

then

bending

the

spring

as

shown

in

the

illustration.

stronger

stronger

KZ

y

weaker

Fig.

4-1

4-3

HEAD

BASE

PLATE

POSITIONING

1.

Set

the

deck

in

the

PLAY

mode.

, ;

2.

Push

the

head

base

plate

by

hand

in

the

direction

of

the

arrow

and

check

that

the

head

base

plate

and

the

stopper

portion

of

the

mechanism

chassis

make

contact.

3.

If

there

is

any

clearance,

loosen

the

two

screws

on

the

head

base

plate

solenoid

and

reposition

the

solenoid

until

the

clearance

is

eliminated.

Head

base

plate

Stopper

portion

of

mechanical

chassis

There

should

be

no

clearance

at

this

point.

Push

by

hand

T-1554-1

when

in

PLAY

mode

23

Fig.

4-2

Screws

Head

Base

Solenoid

Fig.

4-3

Head

base

solenoid

location

4-4

CAPSTAN

ASSEMBLY

THRUST

1.

Turn

the

thrust

adjusting

screw

so

that

thrust

of

the

capstan

shaft

is

within

0.05

mm

to

0.15

mm.

Thrust

play

0.05

mm

to

0.15

mm

ily

—)|__ez

Ue

J

Thrust

adjusting

screw

Flywheel

i

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