Pioneer Sx-939 User manual

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

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

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

»

INPUT_OUTPUT

NeUT

OUT

ae

input

and

output

jacks

Fig.

9

For

playback

For

recording

Y

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.

——FM

TUNING

METER

While

getting

the

SIGNAL

meter

needle

going

to

the

right,

make

fine

adjustment

with

the

FM

TUNING

meter

whose

needle

comes

to

the

center

(indicating

the

optimum

reception).

FM

STEREO

INDICATOR

TUNING

KNOB.

BALANCE

CONTROL

Adjusts

the

balance

between

the

sound

volume

from

the

left

and

right

speaker

systems.

-|—TAPE

MONITOR

(1,

2)

SWITCHES

Monitor

the

recorded

sound

while

recording

with

a

tape

deck.

Also

possible

to

play

back

tapes

as

follows:

V

evisises

ere

With

a

tape

deck

connected

to

the

TAPE

1

jacks

(REC

and

PB),

either

monitoring

of

recording

in

progress

or

playing

back

is

possible.

Bais

grave

ial

With

a

tape

deck

connected

to

the

TAPE

2

jacks

(REC

and

PB

or

REC/PB

con-

nector),

the

same

as

in

1

above

is

possi-

ble.

DOLBY

NR

ADAPTOR

SWITCH

When

employing

Dolby

Noise

Reduction

Adaptor

depress

this

DOLBY

NR

ADAPTOR

to

ON.

PIONEER

FUNCTION

SELECTOR

BUTTONS

For

selecting

the

program

source,

push

each

button

as

follows:

eee

For

AM

broadcast

reception.

FM

sis

aiek

ee

For

FM_

broadcast

reception.

The

STEREO

indicator

lights

up

when

the

broadcast

is

in

stereo.

PHONO

1

...

For

operating

a

turntable

connected

to

the

PHONO

1

input

jacks.

PHONO

2

...

For

operating

a

turntable

connected

to

the

PHONO

2

input

jacks,

MIC:

Fiano

For

using

a

microphone.

Not

possible

to

mix

with

other

program

source.

AUX:

esas

For

listening

to

audio

equipment

(car-

tridge

tape

player,

TV

sound

tuner,

etc.)

connected

to

the

AUX

input

jacks.

DIMMER

SWITCH

Dims

the

brightness

of

the

indicator

light.

Press

again

to

restore

full

brightness.

FM

MUTING

BUTTON

Leave

this

button

undepressed

(in

the

ON

position)

while

tuning

in

FM

stations,

Inter-station

noise

may

interfere

with

FM

reception

while

tuning

between

stations.

To

suppress

this

noise,

leave

the

MUTING

button

undepress-

ed

(in

the

ON

position).

If

the

low

signal

strength

is

due

to

distance

from

the

transmitter

or

other

influences,

depress

this

button,

at

which

the

weak

station

will

be

heard

with

the

MUTING

“OFF.”

LOUDNESS

BUTTON

Depress

this

button

to

listen

at

low

volume.

The

human

ear’s

frequency

response

varies

according

to

the

listening

volume.

The

depressed

button

compensates

for

hearing

response

with

emphasis

on

the

bass

and

treble.

MIC

INPUT

JACKS

LRiosascce

For

connecting

the

left

and

right

channel

microphones.

NOTE:

Use

the

high

impedance

(above

20k8)

with

6mm

diam.

phone

plugs.

VOLUME

CONTROL

Governs

both

the

volume

of

sound

outputs

from

the

speaker

systems

and

from

the

headphones.

MODE

BUTTON

Leave

this

button

undepressed

(if.

necessary,

depress

this

to

release

it

when

already

depressed)

for

STEREO

playback.

For

MONO

playback,

depress

it.

In

this

case

sterco

signals

for

left

and

right

channels

will

be

mixed

into

mono

signal

which

will

be

heard

from

the

center

of

both’

speaker

systems.

"1

et]

HOW

TO

OPERATE

THE

RECEIVER

PREPARING

TO

SWITCH

POWER

ON

Before

switching

on

the

power,

please

set

the

various

controls

as

follows:

@

Set the

VOLUME

control

to

MIN

(minimum

—

fully

anticlockwise).

@

Set the

BALANCE

control

to

the

midway

position,

@

Tum

the

TAPE

and

ADAPTOR

switches

to

OFF

(UP).

©

Set

the

TREBLE

and

BASS

controls

to

the

midway

positions

(the

‘‘0”

positions).

@

Turn

the

TONE

switch

ON

(UP).

©

Set

the

AUDIO

MUTING

button

to

OFF

(un-

depressed).

©

Set

the

MODE

button

to

STEREO

(released/

undepressed).

@

Set

the

FM

MUTING

button

to

ON

(released/

undepressed).

It

is

important

to

set

these

controls

as

indicated

to

avoid

any

inadvertent

overload

on

the

receiver

or

speakers,

etc.,

when

power

is

switched

ON.

FM

RECEPTION

1.

Depress

the

FM

button

for

FUNCTION

selection.

2.

Leave

(or

reset)

the

FM

MUTING

button

to

ON.

Note,

however,

that

in

areas

of

low

signal

strength

the

signal

may

be

suppressed.

In

this

case

only,

the

FM

MUTING

button

should

be

depressed

to

the

OFF

position.

8.

Turn

the

TUNING

knob

to

select

your

station.

Best

reception

is

obtained

when

the

SIGNAL

meter

needle

deflects

to

the

extreme

right,

and

the

TUNING

meter

needle

is

exactly

in

the

center,

as

shown

in

Fig.

13.

If

the

broadcast

is

stereophonic,

the

STEREO

indicator

lamp

will

come

on:

it

will

not

illuminate

for

monophonic

broadcasts.

4.

Adjust

the

loudness

of

the

sound

by

means

of

the

VOLUME

control,

and

use

the

BASS

and

TREBLE

controls

to

give

the

tone

quality

you

prefer.

TUNING

METER

(Both

for

AM

and

FM

Reception)

(Only

for

FM

Reception)

Fig.

13

SIGNAL

METER

AM

RECEPTION

1,

Depress

the

AM

button

for

FUNCTION

selection.

2.

Turn

the

TUNING

knob

to

select

your

station.

Best

reception

is

obtained

when

the

SIGNAL

meter

needle

deflects

to

the

extreme

right

(see

Fig.

13).

8.

Adjust

the

VOLUME,

BASS,

and

TREBLE

controls

for

the

listening

level

and

tone

quality

of

your

preference.

NOTE:

If,

when

listening

to

either

FM

or

AM

reception,

the

sensitivity

seems

poor,

and

interference

is

heavy,

so

that

listening

pleasure

is

seriously

affected,

refer

to

the

section

“ANTENNA

AND

GROUND

CONNECTIONS,”

on

page

7

and

make

any

changes

necessary.

RECORD

PLAYING

1.

Set

the

FUNCTION

selector

to

either

PHONO

1

or

PHONO

2,

dependent

upon

whether

the

turntable

you

are

using

is

connected

to

the

PHONO

1

or

PHONO

2

input

jacks,

respectively.

2.

Operate

the

turntable

to

play

the

record.

3.

Adjust

the

VOLUME,

BASS,

and

TREBLE

controls

for

the

listening

level

and

tone

quality

of

your

preference.

NOTE:

In

order

to

eliminate

the

unpleasant

noise

which

can

mark

the

start

of

playing

a

record,

depress

the

AUDIO

MUTING

—20

GB

button,

releasing

it

after

the

stylus

has

performed

the

run-in,

and

then

adjusting

the

VOLUME

to

give

the

sound

level

of

your

choice.

USING

THE

AUX

JACKS

When

playing

equipment

to

which

the

AUX

jacks

are

connected,

operate

as

follows:

1.

Set

the

FUNCTION

selector

by

depressing

the

AUX

button.

2.

Operate

the

audio

equipment.

3.

Adjust

the

VOLUME,

BASS,

and

TREBLE

controls

for

the

listening

level

and

tone

quality

of

your

preference.

I

Ne

|

12

ae

RT

ee

eee

aes

13)

ON

HET

USING

THE

MICROPHONES

1.

Connect

the

microphones

to

the

L

(left-channel)

and

R

(right-channel)

MIC

jacks.

2.

Set

the

FUNCTION

selector

by

depressing

the

MIC

button.

8.

Set

the

MODE

button

to

STEREO

(released/

undepressed).

4.

Adjust

the

sound

level

by

turning

the

VOLUME

control

to

the

right

little

by

little.

The

midway

setting

of

the

BASS

and

TREBLE

controls

will

usually

be

best.

NOTES:

1.

It

is

readily

possible

for

microphones,

under

certain

conditions

of

use,

to

give

rise

to

“howling”

feedback

noise.

Be

careful

not

to

raise

the

volume

too

high

when

the

microphones

are

close

to

the

speaker

systems

or

in

a

room

with

a

great

deal

of

resonance.

It

is

most

effective

in

using

the

TREBLE

and

BASS

controls

at

their

“0”

settings,

or

in

switching

the

TONE

switch

ON

(UP).

2.

When

a

microphone

has

only

been

connected

to

one

of

the

microphone

jacks

(either

L

or

R),

sound

will

only

be

heard

from

the

corresponding

left-hand

or

right-hand

speaker

systems

as

long

as

the

MODE

button

is

set

at

STEREO.

For

the

sound

to

be

heard

from

both

speaker

systems,

the

MONO

mode

should

be

selected.

USING

TAPE

DECKS

Playback

1.

According

to

the

TAPE

PB

(1,

2),

DOLBY

NR

IN

jacks

to

which

the

tape

deck

is

connected,

either

fhe

TAPE

MONITOR

1

or

2

switches,

or

the

ADAPTOR

DOLBY

NR

switches

should

be

put

ON

(see

Figs.

14

and

15).

2.

Operate

the

tape

deck

controls

to

give

playback.

3.

Adjust

the

VOLUME,

BASS,

and

TREBLE

controls

for

the

listening

level

and

tone

quality

of

your

preference.

NOTE:

Turning

the

TAPE

MONITOR

switch

ON

enables

tape

playback

whatever

the

setting

of

the

FUNCTION

selector.

TAPEDECK1

TAPEDECK2

TAPE

DECK

3

SX.939

eee

Fig.

15

Recording

As

shown

in

Fig.

16,

the

receiver

TAPE

REC

(1,

2),

DOLBY

NR

OUT

jacks

carry

a

certain,

fixed

level

output

from

the

source

selected

by

the

FUNCTION

selector,

which,

once

the

tape

deck

is

connected

to

the

appropriate

jacks,

enables

the

selected

source

to

be

recorded.

The

operation

is

as

follows:

1.

Set

the

FUNCTION

selector

button

for

the

source

to

be

recorded.

2.

Play

the

selected

program

source,

8.

Adjust

the

recording

level

by

means

of

the

controls

on

the

tape

deck,

and

commence

recording.

NOTE:

The

receiver

VOLUME,

BASS,

and

TREBLE

controls

are

completely

inoperative

—

that

is

they

have

no

affection

the

recorded

sound

—

when

recordings

are

being

made.

aes

$

ouPLICATE

4

org

|

SIGNAL

corr Horr

lor

TAPETMONITOR

—

TAPE2MONITOR

DOLBY

NR

SWITCH——

SWITCH

$X-939

Fig.

16

Tape

Monitoring

While

a

recording

is

being

made

with

the

deck,

if

the

TAPE

MONITOR

switch

is

turned

ON,

the

sound

being

recorded

can

be

monitored

through

the

speaker

systems.

In

this

case,

if

the

tape

deck

is

of

three-head

type,

or

if

it

is

equipped

with

a

monitoring

capability,

both

recording

and

playback

connections

must

be

made.

13

DUPLICATING

OR

TAPE

EDITING

RECORDED

TAPES

By

using

two

tape

decks,

a

recording

of

a

complete

.

FM

broadcast,

say,

can

be

first

made,

and

then

those

items

in

it

which

you

want

for

your

permanent

“tape

library”

can

be

selected

and

re-recorded

on

another

tape.

1.

Connect

the

two

tape

decks

as

shown

in

Fig.

17.

2.

Set

the

TAPE

DUPLICATE

switch

to

the

ON

position.

8.

Select

one

of

the

tape

decks

(1

or

2)to

play

back

the

pre-recorded

tape,

and

use

the

other

tape

deck

to

make

the

copy

recording.

4,

When

recording

with

tape

deck

1,

TAPE

MONITOR

switch

1

should

be

switched

ON

to

monitor

the

sound

being

recorded,

and

when

recording

with

deck

2,

TAPE

MONITOR

switch

2

should

be

switched

ON

for

monitoring

(refer

again

to

Fig.

17).

TAPE

DECK

1

—

TAPE

DECK

2

+—dlorr

JOFF

TAPE

2MONITOR

_

DOLBY

NR

|

swiTCH—

SWITCH:

SX-939

Fig.

17

VERSATILE

JACKS

FOR

TODAY

AND

TOMORROW

USE

OF

THE

DOLBY

NR

ADAPTOR

JACKS

If

a

DOLBY

adaptor

is

connected

to

the

receiver

DOLBY

NR

ADAPTOR

jacks,

not

only

can

FM

Dolby

broadcasts

be

played

back,

but

if

a

tape

deck

is

connected

to

the

adaptor

itself,

Dolby

system

recording

and

playback

is

possible.

Reception

of

FM

Dolby

Broadcasts

Reception

and

playback

of

Dolby

system

FM

broadcasts

is

done

with

connections

made

as

follows:

1.

Connect

the

Dolby

adaptor

as

shown

in

Fig.

18

to

the

DOLBY

NR

ADAPTOR

IN

and

OUT

jacks.

2.

Set

the

FUNCTION

selector

to

FM

by

depressing

the

FM

button,

and

tune

in

to

an

FM

Dolby-

system

broadcast.

8.

Tum

the

ADAPTOR

DOLBY

NR

switch

to

ON.

jOFF

Lar

TMontron

SWITCH

FUNCTION

on

SELECTOR

q

Sanat

1

FM

DOLBY

ENCODED

FM

STEREO

BROADCAST

DOLBY

NR

SWITCH

$X-939

Fig.

18

Dolby

System

Recording

and

Playback

with

Tape

Decks

Dolby

Recording

1.

As

shown

in

Fig.

19,

connect

the

Dolby

adaptor

output

jacks

to

the

tape

deck

recording

input

jacks

(LINE

INPUT).

2.

Select

the

program

source

of

your

choice

with

the

FUNCTION

selector.

Dolby

Playback

1.

Connect

the

tape

deck

playback

output

jacks

(LINE

OUTPUT)

to

the

input

jacks

of

the

Dolby

adaptor.

2.

Turn

the

ADAPTOR

DOLBY

NR

switch

to

ON,

and

playback

your

Dolby-system

recordings.

NOTES:

1.

If

you

monitor

the

sound

being

recorded

with

the

Dolby

adaptor,

turn

the

ADAPTOR

DOLBY

NR

switch

ON.

2.

For

detailed

instructions

on

connections,

etc.,

for

your

Dolby

adaptor,

please

see

the

instruction

manual

provided

with

it.

TAPE DECK

FUNCTION

SELECTOR

signal

DOLBY

NR

SWITCH

SX-939

Fig.

19

14

SETTING

UP

A

4-CHANNEL

SYSTEM

As

shown

in

Fig.

20,

a

4-channel

system

consists

of

two

pairs

of

left-hand

and

right-hand

speakers,

one

at

the

front,

and

the

other

at

the

rear.

This

gives

a

whole

new

dimension

of

realism not

attainable

with

conventional

2-channel

stereo.

It

offers

the

sense

of

the

acoustics

of

the

hall—

and

the

atmosphere

and

applause

—

where

the

recording

was

made,

The

unique

sense

of

“presence”

of

being

“actually

there”

which

4-channel

stereo

alone

can

give,

has

to

be

experienced

before

it

can

be

appreciated.

The

receiver

will

form

the

ideal

heart

of

a

4

channel

system,

but

you

will

also

require

four

speaker

systems

and

a

4-channel

decoder/power

amplifier

(‘‘decoder-amp”

below)

for

the

rear

channels.

Operation

1.

Connect

the

receiver

DOLBY

NR

ADAPTOR

OUT

jacks

to

the

decoder-amp

INPUT

jacks.

2.

Connect

the

receiver

DOLBY

NR

ADAPTOR

IN

jacks

to

the

decoder-amp

OUTPUT

jacks.

3.

Turn

the

ADAPTOR

switch

to

ON.

4.

You

are

now

ready

to

enjoy

the

thrill

of

4-

channel

reproduction.

Placement

of

Your

Speaker

Systems

As

shown

in

Fig.

20,

two

pairs

of

speaker

systems

are

located

to

the

front

left

and

right,

and

the

rear

left

and

right

(four

in

all).

Connect

the

speakers

located

in

FRONT

to

the

receiver,

and

the

REAR

speakers

to

the

power

amplifier

for

the

rear

channels.

It

is

also

possible,

according

to

the

restrictions

of

space

or

personal

taste,

to

place

the

speakers

as

shown

in

Fig.

22.

4

CHANNEL

DECODER

AMP

REAR

SPEAKER

POWER

|

FRONT

SPEAKER

on

AMP.

E

RIGHT

‘SX-939

——

ee

|

ONCE

USE

OF

THE

4CH

MPX

OUTPUT

JACKS

Whenever

4-channel

multiplex

discrete

FM

broad-

casts

may

commence,

the

addition

of

a

4-channel

discrete

FM

broadcast

adaptor

(“‘adaptor”

below)

will

enable

full

4-channel

reproduction

of

the

broadcasts

from

your

receiver.

1.

The

adaptor

is

connected

as

shown

in

Fig.

21

to

the

4

CH

MPX

OUTPUT

jack

of

the

receiver.

2.

Connect

the

adaptor

output

to

the

receiver

DOLBY

NR

jacks.

Tum

the

ADAPTOR

switch

ON.

.

Depress

the

FM

button

for

FUNCTION

selection.

.

Tune

in

to

the

4-channel

discrete

FM

broadcast.

.

Adjust

the

VOLUME,

BASS,

and

TREBLE

controls

for

the

listening

level

and

tone

quality

of

your

preference.

OO

oo

NOTE:

For

detailed

instructions

on

connections,

etc.,

see

the

instruction

manual

with

the

adaptor.

4.-CHANNEL

DISCRETE

FM

BROADCAST

ADAPTOR

‘our!

4cH

REAR

AMP_

SPEAKER

4-CHANNEL

DISCRETE

FM.

BROAOCAST

DOLBY

NR

SWITCH

a

H.

FRONT

LEFT

FRONT

RIGHT

REAR

LEFT

REAR

RIGHT.

i

CH.4

REAR

Fig.

22

15

ee

a

CONDITIONS

FREQUENTLY

MISTAKEN

FOR

MALFUNCTION

duced

in

hi-fi

acoustic

units

result

from

external

sources

of

noise:

Due

to

the

inherent

high

sensi-

tivity

and

the

high

fidelity

in

reproduction,

the

unit

amplifies

and

reproduces

extraneous

noises,

however

small,

into

definite

output

noise.

If

your

receiver

produces

a

noise,

check

according

to

the

following

table

and

trace

out

the

source

of

noise

for

the

appropriate

corrective

action.

Noise:

There

are

a

variety

of

noises

relating

to

the

-

operation

of

a

hi-fi

unit.

These

are

generally

divided

into

two

types;

(1)

the

unit

is

faulty

(a

transistor

or

part

has

deteriorated)

and

(2)

an

external

source

is

adding

to

the

unit.

When

a

hi-fi

unit

produces

an

unpleasant

noise,

it

is

often

assumed

that

the

unit

is

faulty,

but

statistical

records

indicate

that

the

majority

of

noises

pro-

SYMPTOM

SUSPECTED

SOURCE

OF

NOISE

DIAGNOSIS

AND

REMEDY

Continuous

or

intermittent

+

Static

(lightning)

In

many

cases,

it

is

very

difficult

to

remove

the

source

noise

like

jjijjj

or

zzzzzz.

+

Fluorescent

lamp,

motor,

or

thermostat

|

of

noise.

In

order

to

make

the

radio

input

larger

than

may

be

in

use

in

house

or

in

the

vicinity

of

|

the

noise

level,

set

up

a

good

outdoor

antenna

and

ra)

the

house.

make

a

complete

grounding.

Q

-

:

mI

<

|

When

a

station

is

tuned

in,

|

+

Poor

fluorescent

lamp,

motor,

or

electric

|

Reversing

the

line

plug

may

occasionally

alleviate

this

|

8

|

hum

is

mixed

in

the

pro-

|

heater

may

be

in

use

in

house

or

near

the

|

noise

problem.

Usually

it

is

very

difficult

to

eliminate

S

|

ram.

house.

the

noise.

s

Hissing

sound

noise

in

AM

+The

frequency

of

an

adjacent

station

is

Impossible

to

remove

such

interference.

If

the

case

of

°

(medium

wave)

reception.

fering

with

that

of

the

station

being

—

such

noi:

in

the

TV

set,

incr

e

the

distance

be-

F

tuned

in

(10kHz

beat

interference).

.

“I

+

TV

set

is

on

in

the

same

house

with

the

<

receiver.

5

=

5

Static

noise

(in

particular,

+

White

noise

generated

from

automobile

|

In

an

area

surrounded

by

hills

or

high

buildings,

the

|

when

automobiles

run

|

engines.

FM

input

signals

are

very

weak.

Thus

the

noise

limiter

=

|

close

to

the

house).

<High

frequency

sewing

machine

or

weld-

|

in

the

circuit

loses

its

function.

Set

up

an

FM

outdoor

Fd

ing

machine

being

used

near

your

house.

|

antenna

having

many

director

elements,

=

Reception

of

FM

st

+

Note

that

the

serv

covered

by

an

|

Increasing

FM

input

signal

may

alleviate

this

problem.

program

contains

more

FM

stereo

broadcast

is

about

50%

of

that

|

Use

an

exclusive

FM

outdoor

antenna

instead

of

the

noise

than

FM

mono

pro-

of

a

regular

mono

broadcast.

|

indoor

T-type

antenna.

gram.

|

Hum

or

buzz.

When

|

+

Poor

connection

of

shielded

wire.

(a)

Correct

the

conditions

stated

in

(a),

(b),

(c)

or

(d).

In

&

|

switched

to

radio

recep-

|

+

Jack

connection

is

loose.

(b)

case

of

(e),

report

it

to

an

official

activity,

&

|

tion,

the

noise

disappears.

|

+

Line

cord

of

fluorescent

lamp

is

near

the

oo

shielded

wire.

(c)

a

+

Poor

grounding.

(d)

|

oO

+

Ham

transmitting

station

or

TV

transmit-

g

ting

station

is

near

your

house.

(e)

%

|

ourput

tone

quality

is

|

-

Stylus

wears

out.

(a)

Check

(a)

through

(e)

and

correct

the

condition.

|

poor

and

mixed

with

noise.

|

-

Record

wears

out.

(b)

=

|

Treble

is

not

clear.

+

Dust

adheres

to

stylus.

(c)

a

+

Stylus

is

improperly

mounted.

(d)

3

+

Stylus

pressure

is

not

proper.

(e)

+

The

TREBLE

level

is

too

high.

Lower

the

TREBLE

level.

WATCH

FOR THE

FOLLOWING

CONDITIONS;

THESE

ARE

ALSO

APT

TO

BE

MISTAKEN

FOR

MALFUNCTIONS,

SYMPTOM

SUSPECTED

SOURCE

OF

NOISE

DIAGNOSIS

AND

REMEDY

Power

is

not

turned

on

|

-

Fuse

blows.

(a)

Check

(a)

and

(b)

and

correct

the

condition.

although

the

power

switch

|

-

Line

plug

is

loose,

(b)

i

is

set

to

ON.

|

=

—.

-

In

playing

@

record,

in-

|

-

Distance

between

the

turntable

and

the

|

Change

the

distance

or

rearrange

the

installation

creasing

the

volume

causes

|

speakers

is

too

short.

increase

of

the

unit

and

speakers.

(Installing

the

howling.

+The

place

on

which

the

turntable

or

|

turntable

on

a

firm,

solid

stand

may

alleviate

this

speakers

are

set

is

unstable.

problem.)

i

Do

not

enhance

the

BASS

sound

level

excessively.

16

PIONEER

MOUNTING

TEMPLATE

90

(3-9/16)

me

(2-3/8)

'

Cutout

in

shelf

for

ventilation

1

ae

|

410

(16-1/4).

49.66

(3/8)

33

(1-5/16)

CLE

T

Ae

LEAL

Amplifier

is

mounted.

‘510

(20-1/16)

Cutout

for

front

panel

mounting

in

cabinet

(Horizontal)

(Can

also

be

used

for

vertical

mounting)

1

UNIT:

mm

(inch)

Remove

the

four

feet

on

the

bottom

plate

of

the

unit.

After

removing

feet,

fasten

setscrews

into

holes

from

which

feet

were

removed.

413

(16-1/4)-

Front

panel

of

unit.

Slight

Clearance

The

top

of

the

shelf

must

not

be

Shelf

(Panel)

higher

than

the

cutout

Setscrews

Use

M4

(ISO)

setscrews

of

within

10mm

(1/3")

long

for

combining

amp’s

bottom

plate

with

any

panel,

allowing

a

slight

clearance.

17

a

SPECIFICATIONS

Semiconductors

FETs

.

3

ICs...

4.

Transistors.

nee

e

cece

renee

57

Diodes

co.

5

02a

te

sip

eisie

niin

Beis

bg

re:

B50

39

Power

Amplifier

Section

70

watts*per

channel,

min.

RMS

at

8

ohms

or

80

watts”

per

channel

at

4

ohms

from

20

Hertz

to

20,000

Hertz,

with

no

more

than

0.3%

total

harmonic

distortion.

Continuous

Power

Output

at

1,000

Hertz

(Both

channels

driven)

.....

75

watts

per

channel

(8

ohms)

100

watts

per

channel

(4

ohms)

Total

Harmonic

Distortion

(20

Hertz

to

20,000

Hertz)

SECET

OTE

TIRE

ik

No

more

than

0.3%

(Continuous

Rated

Power

Output)

No

more

than

0.05%

(1

watt

per

channel

Power

Output,

8

ohms)

Intermodulation

Distortion

.

No

more

than

0.3%

(Continuous

Rated

Power

Output)

No

more

than

0.05%

(1

watt

per

channel

Power

Output,

8

ohms)

Frequency

Response

.........-55

7

Hertz

to

100,000

Hertz

Input

Sensitivity/Impedance

POWER

AMP

IN...

2...

0.00

e

eee

ee

eee

1

V/SOk

ohms

Output

Speaker

.....

vee eee

es

A,B,C,

AtB,

AtC,

B+C

Headphone

........eceeee

eens

Low

impedance

Damping

Factor

(1,000

Hertz,

8

ohms)...

.

Saesesir

GAS)

Hum

&

Noise

(IHF,

short-circuited,

A

Network)

.

ee

ree

110dB

Preamplifier

Section

Input

Sensitivity/Impedance

PHONO

1

00...

cece

eee

e

cece

ene

2.5mV/SO0kQ.

PHONO

2:

needa

Sedies

seve

ee

ees

2.5mV/50kKQ

PHONO

Overload

Level

(rms/p-p)

250mV/700mMV

MIC:

creche

eiba

ste

6

bapa

spose

y

2.0mV/S0kQ.

AUX

..

6.6.

-

150mV/70kQ

TAPE

PB

1,

2

150mV/70kQ

TAPE

PB

2

(DIN

connector).

...........5-

150mV/70kQ

Output

Level/Impedance

TAPE

REC,

2)

scien

tes

ee

tees

eas

we

150mV

TAPE

REC

2

(DIN

connector)............--

30mV/80kQ.

PRE

OUT

occ

ccc

cece

ce

te

ee

tet

onee

1V/1kQ

Harmonic

Distortion

(20Hz~20kHz)

Less

than

0.1%

Frequency

Response

PHONO

(RIAA

equalization)

........

30Hz~1SkHz

£0.3dB

AUX;

TAPE

PB).

25%

asia

cup

tusteeead

e's

10Hz~40kHz*°

dB

Tone

Control

+

BASS:

MAIN...........2...20008

+10dB

(100Hz)

Measured

pursuant

to

Federal

Trade

Commission’s

Trade

+5dB

(SOHz)

Regulation

rule

on

Power

Output

Claims

for

Amplifiers.

+10dB

(10kHz)

+5dB

(20kHz)

18

TREBLE:

aa

es

IONE

ER

Filter

LOW:

CUE

ici6

9

055

oe

dS

pcan

cbeds

—8dB

(SOHz)

6dB/oct.

HIGH

Cut

i

oss

eek

iy

aes

—9dB

(10kHz)

6dB/oct.

Loudness

Contour

(Volume

control

set

at

.

—40dB

position)...........

+8dB

(100Hz),

+4dB

(10kHz)

.

Hum

&

Noise

(IHF,

short-circuited

A,Network)

PHONO

More

than

70dB

MICs.

dee

actrety

Mee

tatioe

geo

88

.

-

More

than

65dB

AUX,

TAPE

PB

.

More

than

95dB

Muting

—20dB

FM

Section

Usable

Sensitivity

(IHF)..........

wees

1.8uV

Capture

Ratio

(IHF)

........

.

1.0dB

Selectivity

(IHF)

........

80dB

Signal-to-Noise

Ratio.

.....

70dB

Image

Rejection

(98MHz)

..

85dB

IF

Rejection

(98MHz)

.

100dB

Spurious

Rejection

...

. .

100dB

AM

Suppression

.....

.

ceva

SSEB.

Harmonic

Distortion:

MONO

Less

than

0.2%

Less

than

0.4%

.

20Hz~15kHz*9:3

dB

50H2~10kHz*9?

dB

Stereo

Separation:

kHz...

.

More

than

40dB

50Hz~10kHz

.

More

than

30dB

Sub

Carrier

Suppression...

6... cece

eee

cee

eee

Antenna

Input

STEREO.

Frequency

Response

75Q

Unbalanced

MUNG

3.4

sie

tine

ts

mts

ee

Ca

stoee

ts

S

Sam

se

ON-OFF

AM

Section

Sensitivity

(IHF,

Ferrite

antenna)...............

300uV/m

(IHF,

Ext.

antenna)...

0.0...

0.00.00

ee

15uV

SOlSCtVity

og:

srtzasie

fa

jaca,

v

cestearo

Bahco,

pr

azhvece

biaee

5

ooy ele

ce

40dB

Signal-to-Noise

Ratio

.

wane

Image

Rejection

.

IF

Rejection

....

Miscellaneous

Power

Requirements

........

AC

120V

60Hz,

220V

50/60Hz

or

110,

120,

130,

220

and

240V

(switchable)

50/60Hz

Power

Consumption

..

470W

600W

(Manufactured

for

England)

Dimensions

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

520

(W)

x

175

(H)

x

420

(D)

mm

20-1/2

x

6-7/8

x

16-9/16

in.

Weight:

Without

Package

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

18.5kg

(40

Ib

11

oz)

With

Package

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

22.6kg

(49

Ib

12

0z)

Furnished

Parts

FM

T-type

Antenna

..

0.0...

2

cee

eee

ee

eee

ee

1

Operating

Instructions...

2...

eee

1

Fuse

6A

Fuse

3A

NOTE:

Specifications

and

the

design

subject

to

possible

modification

without

notice

due

to

improvements.

19

PIONEER

ELECTRONIC

CORPORATION

4-1,

Meguro

1-Chome,

Meguro-ku,

Tokyo

153,

Japan

U.S.

PIONEER

ELECTRONICS

CORPORATION

75

Oxford

Drive,

Moonachie,

New

Jersey

07074,U.S.A.

.

PIONEER

ELECTRONIC

(EUROPE)

N.V.

Luithagensteenweg

no.

3,

2030

Antwerp,

Belgium

PIONEER

ELECTRONICS

AUSTRALIA

PTY.

LTD.

178-184

Boundary

Road,

Braeside,

Victoria

3195,

Australis

Printed

in

Japan

<ARB-099-D>

=

+————

j+—__+

—_|—_1

lt

Pioneer SX-939 User manual

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