Pioneer SX-750 Bedienungsanleitung

l'"*"

'*"*."*..*---.-

"*B

EtE

bE:b

alt fr

(DrrroNEEFr"

sx-75ct

This

Service

Manual

applicable

only

to theKC,KUmodel.

CONTENTS

1. SPECIFICATIONS

BLOCK

DIAGRAM

FRONT

PANEL

FACILITIES 5

CONNECTION

DIAGRAM

CIRCUIT

DISCRIPTIONS

5.7 Protection

Circuit

5.6 Tone

Control

5.9 Power

Supply

5.8 Power

Amplifier

Circuit

5.3 FM

Muting

Circuit

5.5 Microphone

Circuit

5.4 Phono

Equalizer

Amplifier

5.1 AMTuner

5.2 FM

Tuner

DISASSEMBLY

6. ADJUSTMENTS

6.1 AM Section

6.2 FM

Section

6.3 MPX

Adjusrment

6.4 Power

Amplifier

Section

10.

DIAL

CORD

STRINGTNG 22

LEVEL

DIAGRAM

PARTS

LOCATION

10.1 FrontPanel

View

1O.2 FrontPanel

View (with

removdfrontpanel)

10.3 TopView

10.5 Rear

View

10.4 BottomView

1I. EXPLODED

VIEW

11.1 Part

11.2 Part

1.3 Part

Ill

11.4 Part

11.5 Part

11.6 Part

11.7 Part

VlI

11.8 Packing.

12. SCHEMATIC

DIAGRAMS

P.C.

BOARD

PATTERNS

AND

PARTS

LIST

12.1 SchematicDiagrams

12.2 MiscellaneousParts

12.3 Internal

Circuitryof

Integrated

Circuits. .......... 48

12.4 Filter&

MutingAssembly

(AWM-094) .......... 50

12.5 ToneControl

Assembly

(AWG-046) '...- 52

12.6 PowerAmplifier

Assembly

(AWH-046) 54

12.7 PowerSupply

& ProtectionAssembly

(AWR-099) . . . 58

P.A PowerSupply

Assembly

(AWR-1001 62

12.9 HeadphoneJack

Assembly

(AWX-106) ......... 64

12.10Tuner,

& Control

Assembly

(AWE-073) ....... 65

12.11 Amplifier

Assembly

(AWK-065) 73

12.12

De+mphasisSwitch

assembly

(AWXO95} .-..-'... 74

SPECIFICATIONS

Semiconductors

FET

lCs

Transistors.....

Diodes........

AmplifierSection

Continuous

Power

Output

from20 Hertzto 20,000Hertz

(Both

channelsdriven). . 50watts

per

channel

ohms)

60watts

per

channel

ohms)

Total

HarmonicDistortion

(20

Hertzto 20,000Hertz,fromAUX)

ContinuousRatedPowerOutput . ..

Nomorethan

O.1o/o

25watts

per

channel

power

output,8

ohms .. Nomorethan0.05%

1wattper

channel

Power

output,8ohms .. .

Nomore

than

0.05%

lntermodulation

Distortion

(50

Hertz:7,000

Hertz=4:1,from

AUX)

ContinuousRatedPowerOutput . . Nomore

than

0.1%

watts

per

channel

power

output,8ohms .. .

Nomorethan0.05%

1watt

per

channelpower

output,8ohms........

DampingFactor

(20

Hertzto 20,000Hertz). .

Input

(Sensitivity/

pedance

)

PHONO

. .. 2.5mV/50kohms

l\41C.... ... 5mV/50kohms

AUX... .. 150mV/50kohms

TAPEPLAY1...... 150mV/50kohms

TAPEPLAY2...... 150mV/50kohms

TAPEPLAY2

(DlN

connector)... l50mV/50kohms

PHoNooverloadt"""' tt n o .o.

t."':l

.. 200mV

(1kHz)

Output

(Level/l

mpedance)

TAPERECI

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

TAPEREC2...... .........150mV

TAPEREC2

(DlN

connector)

..... 30mV/80kohms

SPEAKER ....... A,

B,A+B

HEADPHONES. . . ..... Lowlmpedance

FrequencyResponse

PHONO

(RIAA

equalization)

.. .... 30Hertzto 15,000Hertz !O.2dB

AUX,TAPEPLAY l0 Hertz

to 50,000Herrz .-?

.....40

ToneControl

BASS

.....

TREBLE... ..

+8dB, 7dB

(100

Hz)

+9d8, 7dB

(10

kHz)

Filter

H|GH... ... 6kHz(6dB/oct.)

LoudnessContour

(Volume

controlset

at 40dB

position)

.... +6dB(100

Hz),

+3dB(10

kHz)

Humand

Noise

(lH

F,short-circuited,A Network,rated

power)

PHONO. ...70dB

AUX,TAPEPLAY... ..........9OdB

FM Section

usable

sensiriviry l\4oNo

. . .. . . .. .10.7d8f(1.99v)

STEREO....

... .19.0dBf

(9.8sV)

50dB

Quieting

Sen5itivity

i\4ONo......... 17.2dBf

(4.0pV)

STEREO....

.... 39.2dBf

(50gV)

Signalto NoiseRatioat

65dBf

MONO.. .....72d8

STEREO. ....67d8

Distortionat

65dBfl00Hz...MONO........ O.15y.

STEREO.......

O.3yo

lkHz....MONO........ O.15Yo

STEREO.......

O.3v.

6kHz....lvlONO....... . OA%

STEREO_......0A%

Frequency

Response

.. -... . 30Hzto 15,OO0Hz

+-8:E

Capture

Ratio .........1.0d8

AlternateChannelselectivity ........ 80dB

SpuriousResponseRatio.

.. .......90d8

lmageResponseRatio... .........80dB

lFResponseRatio... ...100d8

AlVlSuppressionRatio... ......... 55d8

l\4utingThreshold ladBf (2.8t/V)

Stereo

Separation . . 40dB

(l kHz),30dB

(30H2

- l5kHz)

SubcarrierProductRatio .......... 62dB

SCARejectionRatio... .......... 62dB

Antennalnput .300ohmsbalanced

75ohmsunbalanced

150mV

six-75c'

AMSection

Sensilivity

(lH

F,Ferriteantenna)..

(lH

Ext.

antenna)

Selectivity

Signalto

NoiseRatio . .. .. .

lmage

Reiection

lFRejection

Antenna.......... Built-in ......65dB

FerriteLoopstickAntenna

. .13.7kg(30lb2oz)

s.3kg

(33

lb1

oz)

.300s

V/m

....15ttV

. . . .

35dB

.. . .50dB

. . . .40dB

Miscellaneous

PowerRequirements... ...120V,60H2

PowerConsumption 160W

(UL),

350W

(max.)

Dimensions .. 480(W)x149(H)

x371(D)mm

18-718

(w)

s-7l8(H)

x 14-sl8(D)in.

Weight

withoutpackage........

with package

FurnishedParts

FN4T-typeAntenna.

OperatingInstructions

NOTE:

Specifications

and designsubjectto possible

modificotion

without notice,dueto improoements.

2.FRONT

PANEL

FACILITIES

POWER

INDICATOR

LAM

Lightswhen

SPEAKERSswitch

ismovedto any

position

from POWEROFF, and AC power is suppliedto the

receiver.

SPEAK.ERSSWITCH

Functionsboth as powerswitchand speakerselection

switch.

POWER

OFF:ACpower

isoff.

OFF:

AiB:

PHONES

OUTPUT

Insertheadphone

plug into this jack when headphone

listening

isdesired.

Inthiscase,

SPEAKERSswitchshould

bein

OFF

position.

BASS,

TREBLE

CONTROLS

For toneadjustment

when

TONE switch

is in ON posi-

tion.

Whenknobsareturned

clockwisefrom "0" position,

responsein bass

or treblerange,respectively,isboosted.

Turningcounterclockwise

attenuates

response.

TONESWITCH

ControlsON-OFFooeration

of tonecontrolcircuit.

lnthe

ON position, tone control by meansof BASS and

TREBLEknobs

maybeaccomplished.

In the

OFF posi-

tion, the tone controlcircuit is bypassedandfrequency

responseinhigh

andlowrangesis

flat.

HIGH

FILTER

SWITCH

For highfrequencynoisedueto scratcheson the record,

place

switchin 6kHz position.

This will provide

6dB/

octaveattenuation

atfrequencies

above

6kHz.

Fornormal

operationswitch

shouldbeinOFF (upper)

position.

Sound will be heardfrom speakerscon-

nectedto A speakerterminals.

No soundwill be heardfrom speaker

sys-

tems.

This position

shouldbe usedwhen

listening

withheadphones.

Sound will be heardfrom soeakerscon-

nectedto Bspeakerterminals.

Sound will be heardfrom speakerscon-

nectedto A terminals

andfrom speakers

connected

to Bterminals.

STEREOINDICATORLAMP

Lights

whenFM

stereobroadcast

being

received.

(\D

r'IONCGT. BT

EPEAKEFg .* ;'l?."

BALANCE

CONTROL

For adjustment

of relative

output levels

of L and R

channels

of speakersystems

or headphones.

Clockwise

rotation

from center

position

increases

volume

of R over

L channel.

Counterclockwise

rotation

increasesvolume

L channel

over

VOLUME

CONTROL,

For adjustment

of speakeror headphone

output level.

Levelincreases

withclockwise

rotationof knob-

LOUDNESS

SWITCH

SIGNAL

METER

For FM and AM reception,

needle

of the

SIGNALmeter

theright.

turn

TUNINGknobuntil

isdeflecteda maximumto

level,

placing

this

switchin

response

in low and high

FALANCI

FMTUI

With thr

right, fi

TUNIN(

MODE

For sel

playbac

STERE(

channel

speaker:

NOTE:

Recordi

MONO,

rate.

DUPLIC

Withsu

two tap

onto th

operatic

For listening

at low volume

the ON position

will boost

frequency

ranges.

The response

of the human

earto low and highsound

volumes

is different. At low volumelevels,

the ear is

relatively

insensitive

to sounds

at either

extreme

of the

frequency

scale.

By means

of the LOUDNESS

switch,

these

sounds

are

given

additional

amplification.

luutJ

FM lillmilillril'

AM 55

,$?,94,96,0g,100,102

illilrltl |ltlillt]rIrlilttlilttliltl | iltrn,trtt

ilillitiltiltl

ii.

TUNINGMETER

Withthe needle

of the

SIGNALmeter

deflectedto the

right, fine-tuneFM broadcastby centeringneedleof

TUNINGmeter.

PROGRAM

SOURCEINDICATORS

Indicate

program

sourceselected

by meansof FUNCTION

switch.

TUNING

KNOB

For

selectionof FM

orAMstations.

FM MUTINGBUTTON

Foi selectionof FM broadcasts,buttonshouldbein ON

(released)position.

When button is in ON position,

unpleasantinterstation

noiseis suppressed.When

signal

strengthispoor,

it may

notbe

possible

to bringinthedesiredstationif MUTING

isON. In thiscase,

press

buttonto place

it intheOFF

position.

FUNCTION

SELECTOR

Forselectionof program

source.

AM:

FM: AM broadcasts

FMbroadcasts

PHONO: Playing

records

AUX/MIC: For useof component

connectedat AUX

terminalsof receiver,

or microphoneswhich

maybe

plugged

intoMlc jack.

NOTE:

AUX and MIC programsourcescannot be usedsimul-

taneously. When using AUX hi-fi component,micro-

phone

should

bedbconnected.

JAcK

Acceptsstandard6mm{ plug.Microphoneinput signal

entersbothRandL channels.

TAPEMONITOR

SWITCH

1: For program

sourcesother than tapedeck

(playback).

(REC

PLAY).

SOURCE: For programsources

otherthantape deck

(playback).

2: For monitoring

of playback

or record

mode

of tape

deckconnectedto TAPE2 terminals

(REC

orPLAY).

NOTE:

When

not monitoringrecord

orplayback

mode

of a tape

dech,

switchshouldbein SOURCE

position.

Inposition

1 or 2, the

programsourceindicatedby theFUNCTION

selectorwill not be heardthroughspeahersysfemsor

headphones.

i',,1

,,,t

* ;s-

andR

ockwise

'Rover

lume

rt level.

vitchin

high

l sound

3ear is

of the

switch,

to*s ueoiwer: !

MODE

SWITCH

For selection

of stereophonic

or monophonic

modeof

playback.

In normaloperation,

switch shouldbe in

STEREO

position.

In the MONO position,

R and L

channel

signalswill be mixed,and

soundscomingfrom

speakersof bothchannels

will bethesame.

NOTE:

Recording

stereophonicallywith theMODE switchin the

MONOposition may causechannelseparation

to deterio-

rate.

DUPLICATE

SWITCH

With switchin ON position,

signalsrecordedon oneof

two tapedecksconnectedto thereceivermayberecorded

onto the other, with or without editing. For normal

operation,thisswitchmustbein

OFF

(upper)position.

lilllllllllllrllll

3.CONNECTIONDIAGRAM

REAR

VIEW

Outdoor FM antenna

Centerwire

-tl

mesh

75 ohm coaxial cable

{indoor

oroutdoorl

A*ry

ANTENNA

PLACEMENT

Makenote

ot rhelollowing

po'nts when choosing e location

for the FM antenna.

300 ohm leeder cable

Direction ot signals

1.5meter (5 ft.) above

More than 4 meters

(15ft.) above

ground

Please

seetollowing section,

"Antenna and Ground

Connections,"

for instructions

regarding

Fl/1

antenna

FM do-rmph6i5 3witch: For normal FM recebtion rhis switch

shorrld

be seton "75!S" (unir is set to rhis when leavingfactory).

The "25pS" setting is used only when listening to FM Dolby*

transmissaons.

When listening

ro FM Dotby transmissions,

it wi

necessarylo use an NR adaptor wiich can be purchased separately.

More detailedinstructions

witt be found in the section,

,,FM Dotbv

Reception."

Antennashouldnot

tte placed where it

will be subiect to elec-

tracalinterlerence

from motor vehicles.

Fig.I

r L_t

6E E

B E^A tr

Feeder wire and cSle a Length should b€ a

should be insulated at short aspossible.

mounting points, a Feeder

wire should not

b€ coiled.

TOP

VIEW

six-750

Accessory AC outlets:

Switched ...... Power to this outlet is controtted by the SX-750

pow€r switch.Wh€n power to the receiver

is "On," this oudet will

provide

AC currenr{10Owattsmaxamuml.

Unslvitchod.....

Power

to thisoutlet isnot controtted

by theSX,75O

power swilch. As long as the power cord is plugged

into a tive

outlet, thisoutlet will supply AC current{maximum 300 warts).

AC outl€ts

L channel R chr

A SPEAKER SYSTEMS

L channel

R channel

0000

000000

00[|

00000000rt000000000000000000000000000000||0000000

BSPEAKERSYSTEMS

Carrridg€ tape deck Tape deck

Fig.2

4. BLOCKDIAGRAM

ANTENNA

FI1

TSQ

300si

GND

Af1

amp

CF . HA12O1CF HAl13

?T410614P

Ratio

detecfon

SIGNAL

meter^

vlu

CONTROL

SECTION

TAl136P1

TAl 136Pi

A11

TUNER

*,;t-l

AMP

TA1136Pl

IlICAH

c! c!

Tone

control

t-- rF

{rr

(./)

(-/)

OFF

t-rl

-lI

PHONO

AUX n

0N6.l

OFF

16ng

gQnTfol

DCPOWER

SUPPLY

,aF

:;-<

(Yh

AC POWER

C\J C!

,:k

LLJ _l

Dl_'_i

FI1 TUNER

rPFRI F

bA))

TAl

tf-

il,

i!t

tl,

c/)

Lri

-IRFRIF

:tV€

J}}L

_--5. Local

oscillafor^

@g l--

f,tr i

oa o-

2"1

Sro

outlet AC

ouilet

AC].5V

Dia

illunrination

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