Pioneer SX-939 Bedienungsanleitung

<ART-044-0>

SERVICE

MANUAL

STEREO

RECEIVER

KCU,

NOTE:

MODEL

SX-939

COMES

THREE

VERSIONS

DISTINGUISHED

FOLLOWS:

Round

label

rear

panel

Voltage

Type

KCU

120V

only

(U.S.A.)

and

CSA

(Canada)

approved.

110V,

120V,

130V

220V

and

240V

(switchable)

General

export

model

—

220V

only

SEMCO

(Sweden),

NEMCO

(Norway)

and

DEMCO

(Denmark)

approved.

<74B02M61D>

PIONEER

SX-93

CONTENTS

About

220V

only

model

labeled

"GN”

This

model

whose

rear

panel

labeled

"GN”

circular

mark

operates

only

220V,

substantially

its

circuit

design

from

two

other

models.

When

repairing

this

model,

please

see

the

manual

page

and

the

followings

which

include

such

items

Circuit

connection

diagram.

Miscellaneous

parts

list.

Schematic

diagram

power

supply

circuit

assembly,

P.C.

board

pattern

and

its

parts

list.

Before

servicing,

also

please

not

fail

check

see

the

"GN"

mark

labeled

the

rear

panel.

SPECIFICATIONS.

FRONT

PANEL

FACILITIES

CONNECTION

DIAGRAM

BLOCK

DIAGRAM

CIRCUIT

DESCRIPTION

.11

LEVEL

DIAGRAM

.12

DISASSEMBLY

.13

PARTS

AND

P.C.

BOARD

LOCATIONS.14

DIAL

CORD

STRINGING.16

10.

ALIGNMENT

PROCEDURE

10.1

English.17

10.2

Germany’(Abgleichverfahren)

.79

11.

EXPLODED

VIEW

AND

PARTS

LIST.20

12.

SCHEMATIC

DIAGRAMS,

P.C.

BOARD

PATTERNS

AND

PARTS

LIST

12.1

Circuit

Connection

Diagram

and

Miscellaneous

Parts

.27

12.2

Tuner

Assembly

(AWE-041).32

12.3

Muting

Circuit

Assembly

(AWM-063).

12.4

Equalizer

Amplifier

Assembly

(AWF-013).40

12.5

Control

Amplifier

Assembly

(AWG-027)

12.6

Power

Amplifier

Assembly

(AWH-030).

12.7

Protection

Circuit

Assembly

(AWM-062).

12.8

Power

Supply

Circuit

Assembly

(AWR-052)

12.9

Switch

Circuit

Assembly

(AWS-064).

12.10

Switch

Circuit

Assembly

(AWS-065).

12.11

Switch

Circuit

Assembly

(AWS-066).

12.12

Switch

Circuit

Assembly

(AWS-067).

12.13

Switch

Circuit

Assembly

(AWS-068).

12.14

Switch

Circuit

Assembly

(AWS-069).

12.15

Connector

Assembly

(AWX-062).

13.

PACKING

METHOD

AND

PART

NUMBERS

14.

SCHEMATIC

DIAGRAMS,

P.C.

BOARD

PATTERN

AND

PARTS

LIST

FOR

220V

ONLY

MODEL

14.1

Circuit

Connection

Diagram

and

Miscellaneous

Parts

.71

14.2

Power

Supply

Circuit

Assembly

(AWR-056)

SPECIFICATIONS

SEMICONDUCTORS

FETs

ICs

Transistors.

Diodes

AMPLIFIER

SECTION

Continuous

Power

Output

20Hz~20kHz

(Both

channels

driven).

1kHz

(Both

channels

driven).

Harmonic

Distortion

(20Hz—20kHz

Continuous

Power

Output).

(1W

1W,

Power

Output).

Intermodulation

Distortion

(Continuous

Power

Output).

(1W

1W,

Power

Output).

Power

Bandwidth

(IHF,

Both

channels

driven).

Frequency

Response

Input

Sensitivity/Impedance

POWER

AMP

IN.

Output

Speaker

.„....

Headphone

Damping

Factor

(1kHz,

80)

Hum

Noise

(IHF,

short-circuited,

Network).

Residual

Hum

Noise

(80,

Pre

Power

amplifier).

PREAMPLIFIER

SECTION

Input

Sensitivity/Impedance

PHONO

Overload

Level

(rms/p-p).

MIC

AUX.

TAPE

1,2.

TAPE

(DIN

connector).

Output

Level/Impedance

TAPE

REC

TAPE

REC

(DIN

connector).

PRE

OUT.

Harmonic

Distortion

(20Hz~20kHz).

70W

(80),

80W

(40)

75W

(80),

10OW

(40)

Less

than

0.3%

Less

than

0.05%

Less

than

0.3%

Less

than

0.05%

5Hz~40kHz

(T.H.D.

0.3%)

7Hz~100kHz

V/50kO

(40-160)

40-160

than

110dB

Less

than

ImV

2.5mV/50kO

250mV/700mV

2.0mV/50kO

150mV/70kO

150mV

30mV/80kO

V/lkO

Less

than

0.1%

Frequency

Response

PHONO

(RIAA

equalization)

AUX,

TAPE

PB.

Tone

Control

BASS:

MAIN

SUB.

TREBLE:

MAIN.

SUB.

Filter

LOW

Cut

HIGH

Cut.

Loudness

Contour

(Volume

control

set

—40dB

position)

Hum

Noise

(IHF,

short-circuited,

Network)

PHONO

MIC

AUX,

TAPE

Muting.

SECTION

Usable

Sensitivity

(IHF)

Capture

Ratio

(IHF).

Selectivity

(IHF).

Signal-to-Noise

Ratio.

Image

Rejection

(98MHz).

Rejection

(98MHz)

Spurious

Rejection.

Suppression.

Harmonic

Distortion:

MONO

STEREO

Frequency

Response

Stereo

Separation:

1kHz

50Hz~10kHz

Sub

Carrier

Suppression.

Antenna

Input.

Muting.

30Hz~15kHz±0.3dB

10Hz~40kHz+°

±10dB

(100Hz)

±5dB

(50Hz)

±10dB

(10kHz)

±5dB

(20kHz)

—8dB

(50Hz)

6dB/oct.

—9dB

(10kHz)

6dB/oct.

+8dB

(100Hz),

+4dB

(10kHz)

than

70dB

than

65dB

than

95dB

—20dB

1.8juV

I.OdB

80dB

70dB

85dB

lOOdB

55dB

Less

than

0.2%

Less

than

0.4%

20Hz~15kHz-°:o

50Hz~10kHz!g

than

40dB

than

30dB

65dB

300S2

Balanced,

75JT2

Unbalanced

ON-OFF

SX-939

SECTION

Sensitivity

(IHF,

Ferrite

antenna).300/iV/m

(IHF,

Ext.

antenna)

.15

/jV

Selectivity.40dB

Signal-to-Noise

Ratio.50dB

Image

Rejectioa.65dB

Rejection.85dB

MISCELLANEOUS

Power

Requirements

.AC

120V

60Hz

110,

120,

130,

220

and

240V

(switchable)

50/60Hz

Power

Consumption.290W

(UL

approved

model

only)

470W

line

voltage

model

only)

Dimensions.520

(W)

175

(H)

420

(D)

20-1/2

6-7/8

16-9/16

in.

Weight:

Without

Package.18.5

(40

oz)

With

Package.22.6

(49

oz)

FURNISHED

PARTS

T-type

Antenna

Operating

Instructions

Fuse

6A.i

-I

Fuse

3A.

line

voltage

model

only)

NOTE:

Specifications

and

the

design

subject

possible

modification

without

notice

due

improvements.

FRONT

PANEL

FACILITIES

FRONT

PANEL

FACILITIES

SPEAKER

BUTTONS-

Each

speaker

systems

and

connected

each

output

terminals

and

pushing

the

following:

SPKR-A

....

Speaker

systems

into

operation

SPKR-B

....

Speaker

systems

into

operation

SPKR-C

....

Speaker

systems

into

operation

NOTES:

When

any

two

pain

the

buttons

are

depressed,

the

corresponding

pairs

speaker

systems

will

come

into

operation.

However,

operating

all

three

buttons

even

though

depressed

the

same

time

not

possible.

Only

when

listening

through

headphones,

press

again

the

SPUR

hut

ton/s)

use

OEE

(undepressed)

from

the

position

/pressed)

POWER

SWITCH-

Turn

this

switch

but

wait

for

some

seconds,

during

the

silence

which

the

protection

circuit

elimi¬

nates

the

unpleasant

noise

not

imputed

receiver

fault.

PHONES

(1,

OUTPUT

JACKS-

two

pairs

headphones.

BASS

CONTROLS-

Adjust

bass

tone

quality.

100Hz.For

the

low

frequencies

below

400llz.

Possible

lOdB

increasing

reducing

100Hz

2dB

steps.

50H/.Alter

adjustment

the

100Hz

control,

further

adjust

frequencies

below

80Hz

this

control,

necessary.

Possible

5dB

increasing

reducing

bass

response

50Hz

2.5dB

steps.

LOW

CUT,

HIGH

CUT

BUTTONS-

LOW.When

the

low-pitched

rumble

(turntable

motor

other

source)

obtrusive,

de¬

press

the

LOW

CUT

button

ON.

interference,

leave

undepressed

(OFF).

HIGH.When

the

high

frequency

scratch

noise

(records

other

source)

much,

depress

this

button

ON.

interference,

leave

undepressed

(OFF).

TONE

SWITCH-

When

the

(up)

position,

this

switch

causes

the

amplilier

section

operate

with

flat

frequency

regard¬

less

the

tone

control

sellings.

Use

this

switch

check

the

audio

characteristics

your

listening

room

such

when

necessary

check

the

tone

quality

phono

cartridges

and

speakers

and

also

particularly

set

the

tone

controls

assessed.

-SIGNAL

METER

For

and

station

tuning.

tuning:

Tune

the

dial

pointer

that

the

SIGNAL

meter

needle

comes

the

extreme

right.

tuning:

Both

the

SIGNAL

and

TUNING

meters

work

together.

The

optimum

point

the

SIGNAL

meter

needle

the

same

tuning.

Then

use

the

TUNING

meter.

fi¬

i'M

TREBLE

CONTROLS-

Adjust

treble

lone

quality.

lOKHz.For

the

high

frequencies

above

2.5kHz.

Possible

lOdB

increasing

reducing

treble

response

lOKHz

2dB

steps.

20KHz.After

adjustment

the

10kH/

control,

further

adjust

frequencies

above

12kHz

this

control,

necessary.

Possible

5dB

increasing

reducing

treble

response

20kHz

2.5dB

steps.

-AUDIO

MUTING

BUTTON

-20dB

Depress

this

button

mute

the

audio

input

-20dB.

need

turn

down

the

VOLUME

control

each

occasion

for

your

convenience.

TAPE

DUPLICATE

SWITCH-

Leave

this

switch

the

(down)

position

duplicate

edit

recorded

tape

using

two

tape

decks.

For

normal

use,

switch

over

the

(up)

position.

TUNING

METER

While

getting

the

SIGNAL

meter

needle

going

the

right,

make

fine

adjustment

with

the

TUNING

meter

whose

needle

comes

the

center

(indicating

the

optimum

reception).

STEREO

INDICATOR

TUNING

KNOB-,

‘

v‘

}

-•

BALANCE

CONTROL—*

Adjusts

the

balance

between

the

sound

volume

from

the

left

and

right

speaker

systems.

-TAPE

MONITOR

(1,

SWITCHES

Monitor

the

recorded

sound

while

recording

with

tape

deck.

Also

possible

play

back

tapes

follows:

ith

tape

deck

connected

the

TAPE

jacks

(REC

and

PB),

cither

monitoring

recording

progress

playing

back

possible.

ith

tape

deck

connected

the

TAPE

jacks

(REC

and

REC/PB

con¬

nector),

the

same

above

possi¬

ble.

-DOLBY

ADAPTOR

SWITCH

When

employing

Dolby

Noise

Reduction

Adaptor

depress

this

DOLBY

ADAPTOR

ON.

-FUNCTION

SELECTOR

BUTTONS

For

selecting

the

program

source,

push

each

button

follows:

AM.For

broadcast

reception.

.For

broadcast

reception.

The

STEREO

indicator

lights

when

the

broadcast

stereo.

PHONO

For

operating

turntable

connected

the

PFIONO

input

jacks.

PHONO

For

operating

turntable

connected

the

PHONO

input

jacks.

MIC.For

using

microphone.

Not

possible

mix

with

other

program

source.

AUX

.For

listening

audio

equipment

(car¬

tridge

tape

player,

sound

tuner,

etc.)

connected

the

AUX

input

jacks.

-DIMMER

SWITCH

Dims

the

brightness

the

indicator

light.

Press

again

restore

full

brightness.

-FM

MUTING

BUTTON

Leave

this

button

undepressed

(in

the

position)

while

tuning

stations.

Inter-station

noise

may

interfere

with

reception

while

tuning

between

stations.

suppress

this

noise,

leave

the

MUTING

button

undepress¬

(in

the

position).

the

low

signal

strength

due

distance

from

the

transmitter

other

influences,

depress

this

button,

which

the

weak

station

will

heard

with

the

MUTING

"OFF."

-LOUDNESS

BUTTON

Depress

this

button

listen

low

volume.

The

human

ear's

frequency

response

varies

according

the

listening

volume.

The

depressed

button

compensates

for

hearing

response

with

emphasis

the

bass

and

treble.

-MIC

INPUT

JACKS

R.For

connecting

the

left

and

right

channel

microphones.

NOTE:

Use

the

high

impedance

(above

20ksi)

with

6mm

diam.

phone

plugs.

-VOLUME

CONTROL

Governs

both

the

volume

sound

outputs

from

the

speaker

systems

and

from

the

headphones.

■

MODE

BUTTON

Leave

this

button

undepressed

(if.

necessary,

depress

this

release

when

already

depressed)

for

STEREO

playback.

For

MONO

playback,

depress

it.

this

case

stereo

signals

for

left

and

right

channels

will

mixed

into

mono

signal

which

will

heard

from

the

center

both'

speaker

systems.

CONNECTION

DIAGRAM

FERRITE

ANTENNA

For

connecting

4-channel

discrete

adaptor

For

connecting

Dolby

adaptor

DE-EMPHASIS

SWITCH-

some

count'ies,

the

receiver

delivered

with

selector

switch

for

adjusting

the

de-emphasis

from

to75/Jsec.

your

unit

equipped

with

such

switch

the

rear

panel,

and

the

high

sound

range

gives

impression

weakness

move

the

de-em¬

phasis

switch

its

other

posi¬

tion.

PRE/POWER

AMP-

The

bridge/connecting

plugs

between

PRE

OUT

and

POWER

jacks

should

always

left

position

normal

use.

they

are

disconnected

removed,

sound

will

come

from

the

speak¬

ers.

Always

sure

cut

the

power

supply

before

attempting

re¬

move

them.

RIGHT

LEFT

(C)

SPEAKER

SYSTEMS

BLOCK

DIAGRAM

SX-939

CIRCUIT

DESCRIPTION

SIGNAL

PATH

The

broadcast

signal

waveform

from

the

antenna

fed

the

two

dual-gate

MOS

field-effect

transistor

the

front

end

sec¬

tion

for

radio

frequency

amplification.

This

signal

converted

into

intermediate

fre¬

quency

the

dual-gate

MOS

FET

mixer

stage

combination

with

the

signal

from

the

local

oscillator.

The

intermediate

frequency

signal,

con¬

verted

within

the

front

end

section,

fed

three

ceramic

filters

and

two

ICs,

where

tuned,

amplified,

and

detected,

becoming

audio

frequency

(composite)

signal.

The

composite

signal

following

detection

fed

the

MPX

terminal

jack

and

the

multiplex

decoder

stage.

The

multiplex

decoder

stage

uses

one

for

three

functions:

demodulate

the

com¬

posite

signal

into

the

left

and

right

channel

stereo

signals,

operate

the

automatic

mode

switching

between

stereo/mono,

and

switch

the

stereo

indicator

lamp

appro¬

priately.

The

decoding

system

uses

phase

locked

loop

(PLL)

circuit,

which

assures

continuous

stable

operation

and

excellent

stereo

sepa¬

ration

with

low

susceptibility

external

noise

(such

car

ignition

noise)

and

am¬

bient

temperature

changes.

After

decoding,

the

signal

fed

four

transistors

and

one

filter,

where

the

residual

carrier

component

(38kHz,

19kHz,

and

SCA)

rejected,

and

then

the

audio

amplifier

section.

The

muting

circuit

consists

effectively

two

circuits,

designed

reduce

the

pulse

noise

which

can

easily

arise

when

muting

circuit

operative.

The

one

circuit

electronic

switch

in¬

corporated

into

the

IC,

that

the

de¬

modulated

circuit

switched

off

and

the

IC,

and

the

other

gate

circuit

the

com¬

posite

signal

means

FET.

The

tuner

section

employs

one

mono¬

lithic

which

functions

radio

frequency

amplifier,

frequency

converter,

local

oscil¬

lator,

intermediate

frequency

amplifier,

and

detector.

The

output

pure

audio

signal.

The

signals

which

are

applied

the

MIC

and

PHONO

terminal

jacks

are

selected

the

FUNCTION

switch

before

being

fed

the

first

stage

the

three-stage

differential

direct-coupled

equalizer

amplifier

which

the

signals

are

amplified.

order

reduce

the

switch

noise,

the

circuit

configuration

employed

enables

the

potential

the

input

and

output

terminals

set

near

zero

volts.

incorporates

independent

differential

circuit

the

first

stage

the

equalizer

amplifier

whose

supply

uses

twin

plus

and

minus.

The

output

from

the

equalizer

amplifier,

together

with

that

from

the

AUX

terminal

jacks,

the

audio

signal

from

the

tuner,

and

the

audio

signal

from

the

tuner,

are

all

selected

the

FUNCTION

switch,

and

pass

through

the

switch

circuit

for

TAPE

DUPLICATE,

TAPE

MONITOR,

DOLBY

ADAPTOR,

and

the

circuits

for

BALANCE

and

VOLUME

controls,

before

being

fed

the

control

amplifier.

The

control

amplifier

has

extremely

high

input

impedance,

using

PNP

and

NPN

tran¬

sistors

two-stage

direct-coupled

circuit.

This

greatly

reduces

the

influence

the

performance

inherent

equipment

con¬

nected

externally.

The

output

from

this

two-stage

direct-

coupled

circuit

divided

into

two

circuit

systems.

One

goes

the

TONE

switch

via

the

twin

tone

control

circuit,

and

the

other

goes

directly

and

unmodified

any

way

the

TONE

switch.

The

TONE

switch

selects

between

them.

The

amplifier

section

the

twin

control

has

closed

loop

NFB

amplifiers

for

both

the

main

and

sub

circuits,

each

which

has

its

own

transistor,

eliminating

mutual

inter¬

ference.

10.

The

control

amplifier

output

fed

the

power

amplifier

after

passing

through

the

LOW

FILTER,

HIGH

FILTER,

and

AUDIO

MUTING

circuits.

The

first

stage

the

power

amplifier

differential

amplifier

element,

and

the

second

stage

uses

constant

current

load

circuit,

that

potential

drift

pre¬

vented.

the

other

hand,

the

final

output

stage

uses

two

power

transistors

parallel

both

the

upper

and

lower

circuits,

that

large

collector

dissipation

possible.

11.

The

power

amplifier

output

fed

the

three

push

buttons

which

form

the

SPEAKER

switch.

This

selects

and

speaker

system

terminal

connection.

all

three

speaker

systems

were

connected

simultaneously,

the

effective

speaker

impedance

might

less

than

4n.

guard

against

this

possibility,

when

all

three

buttons

are

depressed

together,

all

three

systems

are

disconnected

from

the

amplifier.

12.

The

protection

circuit

which

guards

against

potentials

the

power

amplifier

output

junctions,

against

speaker

complex

load

im-

pedances

less

than

4n,

and

shorts

across

the

speaker

terminals.

Their

operation

such

that,

under

the

corresponding

abnormal

con¬

dition,

relay

acts

separate

the

output

junction

and

the

output

circuit.

Further,

this

protection

circuit

also

helps

mute

the

unwanted

signal

which

immediately

follows

switching

the

POWER

switch

ON,

and

immediately

disconnect

the

output

after

switched

OFF.

Andere Handbücher für SX-939

Inhaltsverzeichnis

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