Pioneer SX-939 User manual

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4

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STEREO

RECEIVER

SX-939

OPERATING

INSTRUCTIONS

YQPIONEER

LINE

VOLTAGE

AND

FUSE

AND

REAR

PANEL

Each

design

of

LINE

VOLTAGE

and

FUSE

of

this

~

model

differs

according

to

each

destination

to

be

delivered.

How

to

operate

the

SX-939

is

quite

the

same

for

each

version.

However,

each

rear

panel

differs

according

to

LINE

VOLTAGE

and

FUSE

designed

for

each

version.

Fig.

A

shows

the

LINE

VOLTAGE

of

a

220V

only

model.

Fig.

B

shows

the

LINE

VOLTAGE

and

FUSE

of

a

5

line

voltage

(110V,

120V,

130V, 220V,

240V)

whose

line

voltage

and

fuse

can

be

changed

and

set

as

follows:

The

Line

VOLTAGE

of

a

120V

only

model

is

illustrated

Connection

Diagram.

220V

model

AC

INLET

5

Line

Voltage

mode!

CONTENTS

SX-939

Features

.............0000

3

Essentials

You

should

Know..........

4

Connection

Diagram

...............

4

Stereo

Setup:

ic

icecicessececs

6

Speaker

Connection

................

6

Antenna

and

Ground

Connections

.....

7

Connections

.........

0.0000

ee

eens

8

CHANGING

LINE

VOLTAGE

SETTING

AND

FUSE

To

remove

the

fuse,

tun

the

fuse

cap

located

on

the

line

voltage

selector

in

the

direction

indicated

by

the

arrow.

Then

remove

the

fuse

plug

from

the

unit.

Put

the

fuse

plug

back

so

that

the

proper

line

voltage

marking

can

be

seen

through

the

cut

in

the

edge

of

the

plug.

Whenever

the

position

of

the

selector

is

changed,

check

the

rating

of

the

fuse.

A

3A_

fuse

is

to

be

used

for

either

220V

or

240V

operation

and

a

6A

rating

for

110V,

120V

or

130V

operation.

If

the

rating

of

the

fuse

is

correct,

replace

cap.

FUSE

REPLACEMENT

When

the

fuse

blows,

remove

the

fuse

cap

and

replace

the

fuse

with

a

new

one.

Fig.

C.

FUSE

FUSE

CAP

PHILLIPS

(3)

SCREWDRIVER

__...

SOCKET

SP

FUSE

PLUG

Fig.

C

Front

Panel

Facilities...

.............

10

How

to

Operate

the

Receiver

........

12

Versatile

Jacks

for

Today

and

Tomorrow

.........

06.

e

cece

eee

14

Conditions

Frequently

Mistaken

for

Malfunction

...............4.

16

Mounting

Template

..............45

17

Specifications

.................000.

18

ee

FON

KK

SX-939

FEATURES

FM

Front

End

With

Dual-Gate

FET’s,

Buffer

Amp

FM

tuner’s

sensitivity,

overload

resistance

(ability

to

receive

very

strong

signals

without

distortion),

image

rejection

and

spurious

rejection

are

determined

chiefly

by

the

front

end.

In

the

SX-939)

latest

components

and

circuit

technology

have

been

employed

to

bring

all

these

values

close

to

their

theoretical

limits:

two

dual-gate

MOS

FET’s.

RF

amplifi-

cation,

and

the

inclusion

of

a

buffer

amplifier

between

local

oscillator

and

mixer

stage.

In

all

performance

character-

istics,

the

SX-939’s

FM

tuner

compares

favorably

with

the

world’s

most

advanced

specialized

tuners,

It

hardly

needs

to

be

mentioned

that

the

FM

dial

is

of

course

divided

into

equal

“linear”

intervals

and

that

dual

tuning

meters

—

signal

strength

meter

and

zero-center

meter

—are

provided

for

easy,

precise

tuning.

Ceramic

Filters

And

IC’s

In

IF

Stages

For

Sharp

Selectivity

A

total

of

three

ceramic

filters

in

the

IF

(intermediate

frequency)

stages

give

sharp

selectivity

and

never

need

to

be

realigned.

Integrated

circuits

functioning

as

limiters

provide

stable

operation

and

excellent

capture

ratio

(the

ability

to

distinguish

between

a

wanted

and

an

unwanted

signal

on

the

same

station

band).

Quadrature

Detection,

Phase

Lock

Loop

(PLL)

Stereo

Demodulator

Detection

of

the

frequency-modulated

signal

is

performed

by

the

“quadrature”

method

with

a

balanced-bridge

type

differential

amp,

This

costly

design

assures

linearity

throughout

the

frequency

band

and

reduces

distortion

to

the

minimum,

In

the

MPX

circuit,

a

phase-lock-loop

(PLL)

circuit

design

is

used

to

give

clear,

stable

separation

at

any

audio

frequency.

The

circuit

is

equipped

with

an

IC

(replacing

six

transistors)

in

a

bridge

configuration.

IC

Mean

Great

AM

Listening,

Too

This

section

also

incorporates

integrated

circuits

and

auto-

matic

gain

control

in

the

RF

and

IF

stages,

as

well

as

a

3-ganged

variable

capacitors

for

improved

image

ratio,

selectivity

and

frequency

response,

plus

reduced

distortion.

Balanced

Positive

And

Negative

Power

Supply

With

Heavy-Duty

Components

The

power

supply

unit

-

backbone

of

any

amplifier

—

is

of

the

most

elaborate

type

such

as

used

anywhere

in

home-use

audio

equipment,

with

balanced

dual,

polarity

supply

and

extre

large10,000uF

capacitors.

This

results

in

a

tremendous

reserve

of

power

for

transient

peaks,

but

also

eliminates

the

irritating

switching

noise

often

encountered

in

less

profes-

sional

designs.

Phono

Equalizer

With

Wide

Dynamic.

Range

And

Extremely

Close

Tolerances

The

incoming

phono

signal

from

a

turntable

is

equalized

precisely

according

to

the

international

RIAA

standard

playback

curve

—

within

0.3

dB

of

the

ideal,

Moreover,

the

phono

inputs

can

accept

relatively

strong

signal

levels

without

distortion

(250mV

rms),

resulting

in

a

wide

dynamic

range.

This

is

due

to

the

circuit

design

with

three

direct-coupled

amplification

stages

including

a

differential

amp

in

the

first

stage.

Twin Tone

Controls

Permit

Precise

“Shaping”

Of

Sound

The

overall

frequency

response

curve

can

be

controlled

in

a

total

of

seven

ways.

Twin

controls

in

the

bass

range

permit

variation

at

100Hz

by

+10dB

in

2dB

steps,

and

at

50Hz

by

+5dB

in

2.5dB

steps;

similarly,

the

high

controls

give

+10dB

correction

in

2dB

steps

at

10kHz,

and

again

+5dB

correc-

tion

at

20kHz

in

2.5dB

steps.

All

tone

controls

can

be

removed

from

the

circuit

(by

setting

the

TONE

swtich

at

OFF)

if

desired.

High

and

Low

filters

are

provided

for

solving

specific

noise

problems,

while

the

Loudness

switch

boosts

the

very

low and

high

frequencies

at

soft

listening

volumes,

giving

a

more

natural

sound

contour,

In

one

word:

the

SX-939

gives

you

complete

mastery

over

what

you

hear.

...

Plus

A

Wealth

Of

Auxiliary

Features

And

Circuits

Dolby*

inputs

and

outputs

permit

confection

of

an

outboard

Dolby

noise

reduction

unit,

for

example,

to

receive

Dolby-encoded

FM

programs.

Two

tape

monitor

circuits

allow

two

tape

decks

to

be

used

for

recording,

playback

and

tape-to-tape

duplicating.

Microphone

inputs

on

the

front

panel

let

you

use

the

SX-939

as

a

public

address

amplifier.

Audio

muting

switch

decreases

the

volume

instantly

by

20dB

without

having

to

turn

back

the

volume

control,

Indicator

lamps

light

up

in

accordance

with

the

functions

used,

telling

you

at

a

glance

what

you're

hearing

and

how.

Dimmer

switch

dims

illumination

of

tuning

dial,

tuning

meters

and

indicator

lamps,

leaving

only

a

softly

glowing

light

in

the

dark.

*The

word

‘Dolby’

is

a

trademark

of

Dolby

Laboratories

Inc.

3

ESSENTIALS

YOU

SHOULD

KNOW

PLACEMENT

OF

YOUR

SX-939

The

SX-939

is

heavy

and

should

always

be

handled

with

great

care.

Equal

care

should

be

given

to

the

choice

of

its

placement

within

your

listening

room.

Once

you

have

chosen

the

best

position,

you

can

proceed

with

connection

of

the

speaker

systems

and

turntable.

Be

sure

to

avoid

the

following

locations,

which

can

cause

malfunctions:

®@

Places

exposed

to

direct

sunlight

or

close

to

heating

units

or

other

sources

of

heat.

@

Places

with

poor

ventilation.

©

Excessively

humid

or

dusty

locations.

©

Sloping

locations,

those

subject

to

vibration,

or

otherwise

unstable.

@

Places

close

to

alcohol

and

spray-type

in-

secticides,

etc.,

or

any

other

such

highly

inflammable

substances.

PROTECTION

CIRCUIT

For

some

3

to

6

seconds

after

the

receiver

is

switched

ON,

no

sound

will

be

heard.

This

is

due

to

the

operation

of

protection

circuits

which

are

designed

to

guard

transistors

and

speakers

from

possible

damage

due

chiefly

to

the

switching

transients,

etc.

Should

the

receiver

remain

silent

for

considerably

longer

than

this,

first

switch

off,

and

then

check

the

speaker

system

connections.

Should

the,,receiver

suddenly

go

silent

while

you

are

listening to

it,

if

you

can

hear

a

continuous

series

of

“clicks”

due

to

relay

contacts

opening

and

closing

within

the

receiver,

this

can

be

an

indication

of

a

short

circuit

in

the

speaker

system

connections.

Switch

off,

and

re-check

the

speaker

system

impedances,

etc.

The

protection

circuit

re-sets

itself

automatically,

so

that

normal

functioning

is

resumed

as

soon

as

the

cause

is

removed.

*

The

word

“Dolby”

is

a

trademark

of

Dolby

Laboratories

Inc.

CONNECTION

DIAGRAM

.

T-TYPE

FM

ANTENNA

FM

DE-EMPHASIS

SWITCH

(5

LINE

VOLTAGE

MODEL

ONLY)

Before

shipment

this

switch

has

been

pre-set

to

the

appro-

priate

position

for

the

delivery

area.

Models

for the

U.S.A.

and

Canada

are

set

to

“75sec”

and

other

models

are

set

to

“BOusec”’.

Incorrect

setting

will

adversely

affect

the

high

sound

range,

so

check

the

position

before

op-

erating

this

unit.

If

you

are

in

doubt

about

the

pre-emphasis

used

in

your

area,

consult

your

audio

dealer.

NOTE:

Be

sure

to

set

the

switch

to

“25usec’”

only

when

receiving

a

special

FM

Dolby”

broadcast

(pre-empha-

sis

25usec)

with

an

auxiliary

Dolby*

NR

adaptor

connected

to

your

system.

OUTDOOR

FM

ANTENNE

AM

ANTENNA

3002

feeder

|

|

|

752

coaxial

cable!

FM

OF

EMPHASIS

Pout

50

7508

ews

AM

FERRITE

ANTENNA

PRE/POWER

AMP—————

The

bridge/connecting

_

plugs

between

PRE

OUT

and

POWER

IN

jacks

should

always

be

left

in

position

in

normal

use.

If

they

are

disconnected

or

removed,

no

sound

will

come

from

the

speak-

ers,

Always

be

sure

to

cut

the

power

supply

before

attempting

to

re-

move

them.

As

for

the

applications

of

the

PRE

OUT

and

POWER

IN

jacks,

please

refer

to

the

section

on

PRE

OUT

AND

POWER

IN

JACKS

on

page

9.

er

ee

4

PIONEER

TAPE

DECK

TAPE

DECK

TURNTABLE TURNTABLE

CARTRIDGE

{open-reel,

cassette)

TAPE

PLAYER

—————

——

LINE

Connect

to

OUTPUT

ground

terminal

of

turntables,

tape

decks,

etc.

Recording

/Playback

cord

DIN-type

For

connecting

4-channel

discrete

FM

adaptor

For

connecting

Dolby

NR

adaptor

SPEAKER

SYSTEMS

STEREO

SETUP

Your

SX-939

receiver

is

ideally

suited

to

form

the

-

heart

of

a

stereophonic

reproduction

system

of

the

very

highest

quality.

Use

it,

as

shown

in

Fig.

1,

with

the

speaker

systems

and

other

components

of

your

choice,

including

tumtable,

tape

deck

(either

open-reel

or

cassette

type),

etc.

The

receiver

can

also

be

used

as

part

of

the

following

systems:

@

Multi-amplifier

systems.

@

Dolby

system

reception,

playback,

and

recording.

@

Four-channel

playback

systems.

@

Four-channel

FM

multiplex

reception.

TAPE

DECK

(open-reel

or

cassette)

TURNTABLE

CARTRIDGE

TAPE

PLAYER

+0

Mal

Oo

‘SX-939

Vadeod

iy

MICROPHONES

go

010

080900

0

(8)

SPEAKER SYSTEMS

Fig.

1

SPEAKER

CONNECTION

The

receiver

is

equipped

with

three

sets

of

speaker

terminals

(A,

B,

and

C).

Use

the

A

terminals

for

the

speakers

in

normal

use.

As

shown

in

Fig.

2

,

connect

the

terminals

marked

R

to

the

RH-speaker

systems

(the

speaker

which

is

on

the

right-hand

side

as

viewed

from

the

listening

position),

and

the

terminals

marked

L

to

the

LH-speaker

systems.

@

As

shown

in

Fig.

3,

the

upper

socket

(red)

is

the

positive

(+)

terminal,

and

the

lower

(black)

is

the

negative

(—)

terminal

in

each

case.

In

the

same

way,

the

speakers,

too,

have

positive

and

negative

polarity

(+

and

—

terminals).

Be

sure

to

connect

terminals

of

the

same

polarity

together

(+

to

+,

and

—

to

—).

SPEAKER

OUTPUT

TERMINALS

RIGHT

CHANNEL,

RIGHT

SPEAKER

LEFT

SPEAKER

SYSTEM

SYSTEM

Fig.

2

NOTE:

When

two

sets

of

speaker

systems

are

being

used

at

the

same

time

(A+B,

A+C,

or

B+C),

please

ensure

that

the

impedance

of

each

speaker

system

is

not

less

than

8Q.

If

speaker

systems

with

impedances

below

8

Q

are

used,

the

protection

circuit

of

the

receiver

may

operate

to

prevent

audition.

Speaker

Terminal

and

Lead-Wire

Connections

Connecting

the

leads

(see

Fig.

3

)

1.

Depress

the

black

lever

on

the

speaker

terminals

and

insert

the

lead

from

the

negative

(—)

side

into

the

lower

socket

hole,

and

release

the

lever.

2.

Lift

up

the

red

lever

on

the

speaker

terminals

and

insert

the

lead

from

the

positive

(+)

side

into

the

upper

socket

hole,

and

then

release

the

lever.

Speaker

lead-wire

10mm.-

Jystiionpe

Remove

insulation

Ss

from

wire

end,

cE

Twist

stranded

wire.

lever

ate

(>)

@

S

lever

Speaker

lead

-wire

(a)

Fig.

3

Speaker

Placement

The

optimum

stereo

effect

is

obtained

from

a

two-channel

stereo

system

when

the

two

speaker

systems

on

the

left

and

on

the

right

are

about

the

same

distance

apart

as

they

are

from

the

listener,

forming

the

three

corners

of

an

equilateral

triangle.

PIONEER

ANTENNA

AND

GROUND

CONNECTIONS

FM

ANTENNA

CONNECTIONS

For

the

best

results

you

should

use

an

outdoor-type

FM

antenna.

The

simple

T-type

antenna

supplied

with

the

receiver

may

be

satisfactorily

used

in

areas

of

high

signal

strength

(for

instance,

those

very

near

to

the

FM

station,

or

in

an

all-wooden

construction

house.)

Placement

and

Connection

of

FM

Antenna

@

Connect

the

feeder

wire

from

the

antenna

to

the

FM

ANTENNA

terminals

on

the

receiver.

@

Please

place

the

antenna

for

the

best

reception

while

listening

to

the

FM

broadcast

station

as

described

in

“FM

Reception”

on

page

12.

ANTENNA

TOAUNBAL

3008BAL

ao

AM

ANT

Fig.

4

T-TYPE

Direction

of

OUTDOOR

FM

pao

station

ANTENNA

“XN

To

FM

ANT

terminal

Fig.

5

Making

Connections

with

Coaxial

Cable

In

certain

locations

—

in

cities

with

high

traffic

density,

in

industrial

areas,

and

near

high

voltage

power

lines

—

objectionable

interference

may

be

present

even

with

the

use

of

an

outdoor

FM

antenna.

Please

consult

with

your

local

audio

dealer

on

the

advisability

of

connecting

the

antenna

and

receiver

with

752

coaxial

cable

in

place

of

the

feeder

you

are

using.

When

using

coaxial

cable,

connections

should

be

made

as

shown

in

Fig.

6.

a

8

A)

Strip

the

coaxial

INNER

cable

as

shown.

CONDUCTOR

©

B)

Loosen

the

screws

and

connect

the

F

cable.

sarthiee

Then

tighten

all

(BRAIDIE

Nene

en

COAXIAL

CABLE

(75-ohm)

Fig.

6

AM

ANTENNA

CONNECTIONS

Under

normal

conditions

it

will

be

sufficient

to

adjust

the

ferrite

bar

antenna

mounted

on

the

rear

panel

of

the

receiver

for

optimum

broadcast

signal

reception

as

shown

in

Fig.

7

and

in

accordance

with

the

instructions

given

on

pagel2

“AM

Reception.”

Should

reception

still

be

noisy

or

week

with

the

bar

antenna,

an

indoor

lead

antenna

or

special

outdoor

AM

antenna

must

be

fitted.

Placement

and

Connection

of

AM

Antenna

©

Connect

the

antenna

lead

to

‘the

receiver

AM

ANTENNA

terminal.

@

Use

vinyl-sheathed

wire

as

shown

in

Fig.

7

for

the

indoor

lead

antenna.

@

For

anoutdoor

AM

antenna,

use

trees,

etc.,

to

suspend

the

vinyl-sheathed

wire

as

shown

in

Fig.

7.

AM

FERRITE

ANTENNA

INDOOR

AM

LEAD

ANTENNA

OUTDOOR

AM

ANTENNA

(8)

(c)

To

AM

ANT

terminal

Fig.7

THE

GROUND

TERMINAL

It

is

advisable,

both

on

the

grounds

of

safety

and

the

elimination

of

interference,

to

install

a

ground

wire

wherever

possible.

CONNECTIONS

TURNTABLE

CONNECTIONS

The

receiver

is

fitted

with

two

phonograph

input

jacks,

PHONO

1

and

PHONO

2,

enabling

two

turntables

fitted

with

magnetic

phono

cartridges

to

be

connected.

©

Connections

between

the

turntable

OUTPUT

plugs

and

the

receiver

PHONO

input

jacks

should

be

made

as

shown

in

Fig.

8,

taking

care

not

to

confuse

L

&

R

channels.

If,

as

in

Fig.

8,

the

turntable

is

fitted

with

a

ground

lead

or

plug,

this

should

be

connected

to

the

receiver

GND

terminal.

NOTES:

1,

When

using

a

turntable

fitted

with

two

tonearms,

the

output

leads

for

each

of

the

tonearms

should

be

connected

to

the

respective

PHONO

input

jacks

(I

and

2).

2.

When

using

a

turntable

fitted

with

a

moving

coil

(MC)

phono

cartridge,

it

is

essential

to

use

a

special

MC

matching

transformer

or

head

amplifier.

$X-939’s

PHONO

input

jacks

R

CH

TURNTABLE’s

output

jacks

TAPE

DECK

CONNECTIONS

The

provision

of

two

sets

of

recording

output

jacks

(TAPE

1,

2

REC)

and

two

sets

of

playback

input

jacks

(TAPE

1,

2

PB)

plus

a

DIN-type

recording/playback

connector

(TAPE

2

REC/PB)

means

that,

in

addition

to

normal

recording

and

playback,

two

tape

decks

can

be

used

to

record

at

the

same

time,

or

to

“dub”

or

duplicate

recordings

from

one

tape

deck

to

the

other.

Use

the

connecting

cord(s)

provided

with

the

tape

deck(s)

to

make

the

connections

(see

Fig.

9).

Thé

tape

deck

can

also

be

connected

to

the

ADAPTOR

jacks

(DOLBY

NR

—

noise

reduction).

Fig.

8

$X-939's

TAPE

jacks

LINE

LINE

»

INPUT_OUTPUT

NeUT

OUT

ae

input

and

output

jacks

Fig.

9

For

playback

For

recording

Y

connection

connection

Connections

for

Recording

@

The

receiver

output

TAPE

1

REC

jacks

are

connected

to

the

recording

input

jacks

(LINE

INPUT)

of

the

tape

deck

as

shown

in

Fig.

9.

The

upper

jacks

of

each

pair

are

the

L

(left)

channels

and

the

lower

are

the

R

(right)

channels.

When

the

tape

deck

is

provided

with

a

DIN-type

connector

for

recording

and

playback,

use

the

optional

recording/playback

cord

(e.g.

Pioneer

model

PP-101)

to

make

the

connection

with

the

TAPE

2

REC/PB

DIN

connector.

NOTE:

If

the

recording/playback

cord

connects

both

recording

and

playback

at

the

same

time,

there

is

no

need

to

make

separate

connections

to

either

TAPE

2

REC

output

jacks

or

TAPE

2

PB

input

jacks,

If

the

ADAPTOR

OUT

jacks

are

to

be

used,

connect

them

to

the

tape

deck

input

(LINE

INPUT)

jacks.

@

When

using

two

tape

decks,

the

second

tape

deck

should

be

connected

to

the

receiver

TAPE

2

REC

output

jacks.

If,

however,

the

first

deck

has

been

connected

to

the

DIN-type

recording/

playback

connector,

the

second

deck

should

be

connected

to

the

TAPE

1

REC

output

jacks.

$X-939's

TAPE

jacks

DIN-type

Recording/Playback

cord

(e.g,

Pioneer

model

PP-101)

REC/PB

TAPE

DECK’s

DIN-type

connector

Fig.

10

ee

R

PIONEER

Connections

for

Playback

@

Connect

the

receiver

TAPE

1

PB

input

jacks

to

the

playback

output

jacks

(LINE

OUTPUT

or

TAPE

MONITOR)

on

the

tape

deck.

The

upper

jacks

of

each

pair

are

the

L

(left)

channels,

and

the

lower

are

the

R

(right)

channels.

NOTE:

If

the

ADAPTOR

IN

jacks

are

to

be

used,

connect

them

to

the

tape

deck

output

(LINE

OUTPUT)

jacks.

@

When

using

two

tape

decks,

the

second

tape

deck

should

be

connected

to

the

receiver

TAPE

2

PB

input

jacks.

If,

however,

the

first

deck

has

been

connected

to

the

DIN-type

recording/

playback

connector

(TAPE

2

REC/PB),

the

second

deck

should

be

connected

to

the

TAPE

1

PB

input

jacks.

USE

OF

THE

AUX

INPUT

JACKS

These

jacks

are

a

set

of

spare

input

jacks.

They

can

be

connected

to

cartridge

tape

players,

television

sound

multiplex

tuners,

or

other

forms

of

signal

output.

The

upper

of

the

two

terminals

is

the

L

(left)

channel,

and

the

lower

is

the

R

(right)

channel.

USING

THE

PRE

OUT

AND

POWER

IN

JACKS

If

the

connections

between

the

PRE

OUT

and

POWER

IN

jacks

shown

in

Fig.

11

are

removed,

the

power

amplifier

and

pre-amplifier

sections

can

function

separately.

By

isolating

the

receiver

pre-amplifier

section,

it is

possible

to

use

it

to

drive

a

separate,

high

output

power

amplifier

or

to

build

up

a

multi-amplifier

system

as

detailed

here.

Fig.

11

Connections

for

Setting

up

A

Multi-amplifier

By

purchasing

anelectronic

crossover

network

and

one

or

two

additional

power

amplifiers,

a

two-

or

three-way

multi-amplifier

system

can

be

set

up.

The

multi-amplifier

system

splits

up

the

audible

frequency

range

into

different

frequency

bands,

operating

amplifiers

and

speakers

ideally

suited

to

each

band.

This

results

in

reduced

intermodulation

distortion

and

improved

damping

and

crossover

characteristics.

Use

of

the

multi-amplifier

system

enables

construction

of

the

ideal

playback

system.

Connections

for

a

two-way

multi-amplifier

system

are

as

follows:

1.

Remove

both

of

the

plugs

bridging

the

PRE

OUT

and

POWER

IN

jacks.

2.

Connect

the

PRE

OUT

jacks

to

the

input

jacks

of

the

crossover

network.

3.

Connect

the

POWER

IN

jacks

to

the

LOW

range

jacks

of

the

crossover

network.

4,

Connect

the

HIGH

range

output

jacks

of

the

crossover

network

to

the

input

jacks

of

a

separately

bought

power

amplifier

for

the

high

frequency

range.

5.

Connect

the

speakers

for

the

lower

frequencies

to

the

receiver,

and

those

for

the

higher

fre-

quencies

to

the

separate

amplifier.

The

levels

of

the

different

frequency

ranges

are

adjusted

at

the

crossover

network.

For

detailed

instructions

on

the

use

of

the

crossover

network,

please

refer

to

the

instruction

manual

provided

with

it.

SPEAKER

SYSTEMS

$X-939

RIGHT

SIDE

TWEETER

CROSSOVER

NETWORK

WOOFER

POWER

AMPLIFIER

(HIGH-RANGE)

Fig.

12

FRONT

PANEL

FACILITIES

SPEAKER

BUTTONS

Each

of

speaker

systems

A,

B,

and

C

is

connected

to

each

of

output

terminals

A,

B,

and

C.

By

pushing

the

following:

SPKR-A

....

Speaker

systems

A

into

operation

SPKR-B

....

Speaker

systems

B

into

operation

SPKR-C

....

Speaker

systems

C

into

operation

NOTES:

1.

When

any

two

pairs

of

the

buttons

(A

+

B,

B+

C,C

+A)

are

depressed,

the

corresponding

pairs

of

speaker

systems

will

come

into

operation.

However,

operating

all

three

buttons

even

though

depressed

at

the

same

time

is

not

possible.

2.

Only

when

listening

through

headphones,

press

again

the

SPKR

button(s)

in

use

to

OFF

(undepressed)

from

the

ON

position

(pressed)

POWER

SWITCH:

Turn

this

switch

ON

but

wait

for

some

3

to

6

seconds,

during

the

silence

of

which

the

protection

circuit

elimi-

nates

the

unpleasant

noise

not

imputed

to

a

receiver

fault,

For

details,

see

“PROTECTION

CIRCUIT”

on

page

4.

PHONES

(1,

2)

OUTPUT

JACKS

Accept

two

pairs

of

headphones.

SIGNAL

METER

For

AM

and

FM

station

tunings.

AM

tuning:

Tune

the

dial

pointer

so

that

the

SIGNAL

meter

needle

comes

to

the

extreme

right.

FM

tuning:

Both

the

SIGNAL

and

FM

TUNING

meters

work

together.

The

optimum

point

of

the

SIGNAL

meter

needle

is

the

same

as

in

AM

tuning.

Then

use

the

FM

TUNING

meter,

BASS

CONTROLS

Adjust

bass

tone

quality.

1OOHz

.....

For

the

low

frequencies

below

400Hz.

Possible

up

to

10dB

of

increasing

or

reducing

at

100Hz

in

2dB

steps.

SOH2

=

53

e.

After

adjustment

by

the

100Hz

control,

further

adjust

frequencies

below

80Hz

by

this

control,

if

necessary.

Possible

up

to

5dB

of

increasing

or

reducing

in

bass

response

at

SOHz

in

2.5dB

steps.

LOW

CUT,

HIGH

CUT

BUTTONS:

LOW

......

When

the

low-pitched

rumble

(turntable

motor

or

other

source)

is

obtrusive,

de-

press

the

LOW

CUT

button

to

ON.

Inno

interference,

leave

it

undepressed

(OFF).

HIGH

......

When

the

high

frequency

scratch

noise

(records

or

other

source)

is

much,

depress

this

button

to

ON.

In

no

interference,

Icave

it

undepressed

(OFF).

TONE

SWITCH

When

in

the

ON

(up)

position,

this

switch

causes

the

amplifier

section

to

operate

with

a

flat

frequency

regard-

less

of

the

tone

control

settings.

Use

this

switch

to

check

the

audio

characteristics

of

your

listening

room

such

as

when

it

is

necessary

to

check

the

tone

quality

of

phono

cartridges

and

speakers

and

also

to.particularly

set

the

tone

controls

to

be

assessed,

TS

SE

I

10

TREBLE

CONTROLS:

Adjust

treble

tone

quality.

10KHz

.....

For

the

high

frequencies

above

2.5kHz.

Possible

up

to

10dB

of

increasing

or

reducing

in

treble

response

at

10KHz

in

2dB

steps.

20KHz

.....

After

adjustment

by

the

10kHz

control,

further

adjust

frequencies

above

12kHz

by

this

control,

if

necessary.

Possible

up

to

SdB

of

increasing

or

reducing

in

treble

response

at

20k

Hz

in

2.5dB

steps.

AUDIO

MUTING

BUTTON

—20dB

Depress

this

button

to

mute

the

audio

input

to

—20dB.

No

need

to

turn

down

the

VOLUME

control

on

each

occasion

for

your

convenience.

TAPE

DUPLICATE

SWITCH

Leave

this

switch

in

the

ON

(down)

position

to

duplicate

or

edit

a

recorded

tape

using

two

tape

decks.

For

normal

use,

switch

over

to

the

OFF

(up)

position.