280B Series

Scully 280B Series User Manual

Scully 280B Series

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Model

285B

Theory

of

Operation

assembly

back

to

pln

6

of

power

amplifier

U3

in

the

play

electronics

assembly.

The

power

amplifier

raises

the

level

of

audio

signal

to

a

level

sufficient

to

drive

the

headset

or

an

external

8-ohm

impedance

sp

~

&ker.

The

output

of

U3

is

connected

to

PH

O

NES

jack

J133

on

the

transport

control

chassis,

then

to

the

SPEAKER O

UTPUT

terminal

block

on

the

power

supply

assembly.

When

headphones

are

plugged

into

the

PH

O

NES

jack,

the

connection

to

the

speaker

is

opened.

4.7

POWER

SUPPLY

4.8

The

power

transformer

has

a

tapped

primary

winding

to

compensate

for

different

power

sources.

The

transformer

is

factory

wired

for

115-120

volt,

50

/

60

Hz

power

source.

If

the

reproducer

is

operated

at

a

different

line

voltage,

the

jumper

on

the

power

transformer

input

winding

should

be

changed

(see

Figure

7-3).

The

output

of

the

power

transformer

is

applied

to

a

commercial

power

supply

regulator

(PSR1).

The

regulator

has

three

adjustments

which

are

set

at

the

factory.

They

are

current

limit,

overvoltage

protection

and

output

voltage

adjust.

It

is

not

recommended

that

the

adjustments

be

changed

in

the

field

except

for

the

possible

exception

of

the

output

voltage

adjust-

ments

as

explained

in

Section

6,

ELECTRONICS MAINTENANCE.

4-3

/

4-4

Table of Contents

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Scully 280B Series Specifications

General

Brand	Scully
Model	280B Series
Category	Turntable
Language	English