Fisher CR-7000 - Torque and Tension Adjustments; Take-up Torque Measurement; Back Tension Measurement; Tape Tension Adjustment

8 pages

To Next Page

To Next Page

To Previous Page

To Previous Page

Loading...

(3)

Torque

and

tension

(A)

Take-up

torque

|

(B

al

(C)

Measure

with

torque

gauge

(figure

three)

Play

30

~

60gr/cm

Fast

forward

55

~

90gr/cm

Rewind

55

~

90gr/cm

Fig.

3

Back

tension

Measure

with

tension

gauge.

To

use

a

tension

gauge,

make

a

hole

in

the

side

of

the

cassette

as

shown

in

figure

four.

Be

careful

that

the

tape

does

not

rub

against

the

edge

of

the

cassette;

these

will

make

correct

measurement

impossible.

Play

Less

than

5gr/cm

Fast

forward

Less

than

5gr/cm

Rewind

Less

than

5gr/cm

Fig.

4

Tape

tension

As

shown

in

figure

five,

cut

off

a

length

of

tape.

Tie

one

end

to

a

thread

connected

to

the

tension

gauge,

and

leave

the

other

end

hanging

loose.

Operate

the

unit

in

PLAY

mode

and

hold

the

tension

gauge

steady

(do

not

move

it

to

left

or

right).

When

the

tape

stops,

read

the

tension

gauge.

If

this

reading

is

over

100

gram,

no

adjustment

its

needed.

If

it

is

not

over

100

gram,

adjust

the

pinch

roller

pressure.

This

is

done

by

bending

the

coil

spring

86

(141-2-852T-37600)

shown

in

the

mechanism

ex-

ploded

view.

Clean

the

pinch

roller

with

alcohol

only

so

that

tape

will

not

slip.

Fig.5

(4)

Tape

speed

Remove

the

cabinet

(108)

by

unfastening

the

four

binding

head

screws

(Y108

3

x

8mm)

fixing

the

cabinet.

Remove

the

front

panel

(101)

by

unfastening

the

six

washer

head

tapping

screws

(Y110

3

x

8mm

and

Y111

3

x

10mm)

fixing

the

front

panel.

See

the

cabinet

exploded

view

for

the

details.

Connect

the

tape

speed

counter

to

LINE

OUTPUT

terminal

(left

or

right

channel)

of

the

unit.

Load

a

tape

speed

test

tape

(MTT-111)

and

operate

the

unit

in

the

playback

mode.

Turn

semi

valiable

resistor

of

the

motor

clockwise

or

counterclockwise

through

the

adjustment

hole

to

obtain

3

KHz

+10Hz

indication

of

the

tape

speed

counter.

LED

PCB

(5)

PAUSE

timing

Operate

the

unit

in

the

PLAY

mode

(Unload

the

cassette

when

making

this

adjustment).

Press

the

PAUSE

button

gradually

and

bend

the

arm

of

the

pinch

roller,

using

a

pair

of

pliers,

as

shown

in

figure

seven.

When

properly

adjusted,

first

the

pinch

roller

should

stop

running

and,

then,

the

take-up

reel.

There

should

be

a

clearance

of

approximately

0.1

0.4mm

_

between

the

capstan

and

the

pinch

roller

when

the

pinch

roller

has

come

to

a

halt.

(a)

There

should

be

a

gap

of

approximately

0.1

to

0.4mm

when

the

take-up

reel

has

stoped

running.

(b)

Capstan

(c)

Pinch

roller

(d)

Leverpinch

roller

assembly

(e)

Arm

(f)

Slide.

PLAY

BUTTON

PAUSE

BUTTON