280B Series

Scully 280B Series User Manual

Scully 280B Series

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7-6

Maintenance

Model

280B

Figure

7-5.

Tension

Post

Adjustments

arm

hits

its

nylon

stop.

On

rack-mounted

units

(transport

operated

in

the

vertical

position),

set

the

tension

of

the

tape

break

arm

to

the

minimum

tension

required

to

prevent

the

arm

from

resting

at

the

dead

center

(vertical)

position.

7-6. Pinch Roller Adjustment (Figure 7-6)

The

pinch

roller

adjustment

is

made

by

means

of

the

nut

(2)

at

the

end

of

the

threaded

connecting

rod

(3)

which

provides

the

link

between

the

sole-

.

noid

(4)

and

the

pinch

roller

actuating

arm

(7).

Tightening

this

nut

(2)

increases

the

roller

pressure.

Excessive

pressure

places

an

unnecessary

and

unde-

sirable load

on

the

upper

(sleeve)

bearing

of

the

capstan

motor,

and

a

point

is

reached

where

fur-

ther

turning

of

the

nut

will

prevent

the

solenoid

plunger

from

bottoming.

At

this

point,

roller

pres-

sure

drops

rapidly,

becoming

inadequate

to

drive

the

tape

without

slippage.

It

is

then

necessary

to

back

off

the

nut.

The

rubber

pinch

roller

bearing has

been

selected

for

minimum

radial

runout.

The

radii

of

the

inner

and

outer

raceways

of

this

bearing

are

larger

than

the

ball;

therefore,

some

rocking

freedom

can

be

felt

. When

the

pinch

roller

is

actuated,

this

freedom

Figure 7 -6.

Pinch

Roller

Adjustment

allows

the

face

of

the

pinch

roller

to

align

with

the

capstan,

thereby

minimizing

tape

distortion

from

any

scrubbing

action

between

these

two

compo-

nents.

The

pinch

roller

adjustment

procedure

is as

follows:

A.

Thread

tape

on

the

machine.

Remove

tape

from

between

the

capstan

and

pinch

roller

so

that

the

tape

rides

on

the

bottom

(operator)

side

of

the

capstan

when

the

machine

is in

the

Play

mode.

B.

Loosen

the

Allen

setscrew

on

the

capstan

sole-

noid

adjustment

nut

(2).

c.

With

the

machine

in

the

Play

mode,

use a zero-

to-15

lb

(6.81

kg)

tension

scale

to

push

against

the

arm

in

line

with

the

pinch

roller

shaft.

Align scale

pressure

so

that

the

force

of

the

scale

tends

to

remove

the

pressure

of

the

roller

from

the

shaft.

D.

Push

on

the

scale

until

the

pinch

roller

stops

rotating,

indicating

that

the

pinch

roller

had

just

broken

contact

with

the

capstan.

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Scully 280B Series Specifications

General

Brand	Scully
Model	280B Series
Category	Turntable
Language	English