280B Series

Scully 280B Series User Manual

Scully 280B Series

241 pages

To Next Page

To Next Page

To Previous Page

To Previous Page

Page #36 background image

Loading...

Page #36 background image

Maintenance

E. Adjust

the

capstan

solenoid

adjustment

nut

(2)

to obtain a 6 lb (2.72 kg) indication

on

the

tension scale.

F. Tighten

the

Allen setscrew

on

the

solenoid ad-

justment

nut

(2).

G. Check

the

gap

between

the

pinch roller and

capstan.

The

gap should

be

approximately

0.10

to

0.30

(2.54

to

7.62

mm).

Readjust

the

gap

by moving

the

L-shaped

stop

bracket

(6)

mounted

to

face

of

capstan solenoid. Loosen

the

two

screws (5) in

slotted

holes

and

move

the

bracket

as

required.

Be

sure

that

the

rod

(3) from

the

solenoid

to

the

pinch

roller

does

not

bind in

the

slot

of

the

bracket.

7.7 Constant Tension Adjustment

[:~~~~~J

High voltage

is

present

on

the

tension

sensor

PW

A.

A.

Open

the

screw valve

on

the

airpot

until

the

damping

effect

is

not

noticeable.

B.

Connect

a Simpson Model

270

or

equivalent

VOM

set

to

the

250

Vac scale, across

the

supply

motor

terminals

(J106

pin

3

and

NEUTRAL).

C. Loosen

the

locknut

on

resistor

R204

on

the

power

supply,

Figure 7-7.

Turn

R204

for

a

minimum resistance (fully ccw). Hold a piece

of

black

paper

in

the

slot

of

the

opto

coupler.

Put

the

machine in Play

mode

and observe

the

VOM.

It

should indicate

85

±5

volts rms.

D.

Tum

R204

cw until

the

voltage

drops

3 volts

rms. Record this voltage. Tighten

the

lock

nut

on

R204.

E. Check

that

the

optical grating

is

rotating

in

the

center

of

the

opto

coupler

slot

as

shown

in

Figure 7-8 A and

B.

F. Loosen

the

setscrew

on

the

coupler,

Figure

7-8A,

and move

the

dancer

arm

to

the

fully

ccw

(from

the

top)

position.

Position

the

opti-

cal grating

for

minimum

voltage reading across

7-8

Model 280B

A This

centering

is

important

to

obtain

voltage

in

step

F.

B

This

centering

is

important

only

to avoid

contact

during

operation.

c

Approximately

45°

for

minimum

voltage

.

Figure 7-8.

Constant

Tension

Adjustment

Procedures.

the

motor

(see Figure

7-BC).

The

VOM should

indicate 8

±3

volts rms.

G. Move

the

dancer

arm

to

the

7:00

o'clock

posi-

tion

(from

the

top).

The

voltage should be

the

same as

recorded

in

step

D.

H. Place a tape

tensiometer

on

the

tape

between

head bridge and

capstan.

Adjust

spring

on

con-

stant

tension, Figure 7-9,

to

obtain

proper

ten-

sion

as

shown

below:

0.25

in

tape

=

3.5

to

4.5

oz

0.50

in

tape

= 7

to

8

oz

1.

Close screw valve

on

airpot

until

the

damping

effect

causes

the

arm

to

bounce

as it

turns

to

the

stop.

Open

screw valve

enough

to

allow

smooth

travel

of

the

arm.

Open

screw valve

one

complete

rotation.

Table of Contents

Questions and Answers:

Need help?

Do you have a question about the Scully 280B Series and is the answer not in the manual?

Scully 280B Series Specifications

General

Brand	Scully
Model	280B Series
Category	Turntable
Language	English