Pioneer SX-1250 Bedienungsanleitung

/FM STEREORECEIVER

sx-l?50

<ART,158-0>

77i <, "

- ^-C r

lif

' rl

(v)proNEER

Type Voltage Remarks

KCU 120Vonly CSA {Canada}

and UL {U.S.A)

approved

with de'emphasisselector switch (25psl75ps)

HG 22OV and24OV (Switchable) SEMKO

{Sweden),

NEMKO

(Norwav),

DEMKO

(Denmark)

and

El (Finland)

approv€d

s1IOV, 12OV,22OV and240V {Switchable) Generalexport modelwith de-emphasisselector

switch{25pslsops/75psl

MODELSX.125O

COMES

THREEVERSIONSDISTINGUISHED

ASFOLLOWS:

Whenrepairing

Sor HGtype,

please

see

the

manualonpage

101.

CONTENTS

SPECIFICATIONS

FRONTPANEL

FACILITIES

CONNECTION

DIAGRAM

CIFCUITDESCRIPTIONS

4,1 TunerSection

4.2 AudioSection

4.3 Protection

Circuit

. .......,. 17

4.4 Power

Supply

Circuit ....... 18

LEVEL

DIAGRAM

.,.. ......... 19

BLOCKDfAGRAM

....

. ....... 20

DlsAssEMBLY. ........22

PARTS

LOCATION

8.1 Front

Panel

View.. ........ 25

4.2 RearPanel

View .........,27

8.3 TopView ........29

8.4 Bottom

View ....., 31

8.5 Front

View .......33

ADJUSTMENTS

9.1 AMTuner ... . 3b

9.2 FM

Tuner ...........36

9.3 Power

Amplifier ...........38

9.4 Stabilizer ... .. ..... 38

DIALCORDSTRINGING ........ 39

EXPLODED

VIEWS

. ... . 40

SCHEMATICDIAGRAMS,

P.C.

BOARDPATTERNS

AND

PARTS

LISTS

9. Ii

10.

11.

12.

12.1 Miscellaneous-parts

'--

\o 12.2

12.3

12.4

12.5

12.6

12.7

12.8

12.9

12.10

12.11

12.12

12.13

12.14

12.15

12.16

12.17

12.18

sx-1 25C,

SchematicDiagram

Internal

Circuitryof Integrated

Circuits

The

Circuitof FMFrontEnd

(AWB-023)

Tuner

Assembly

(AWE-0681

De+mphasis

Switch

Assembty

(AWX-099)

Equalizer

Amplifier

Assembly

(AWF-021

)

Function

SwitchAssembly

(AWS-094)

FlatAmplifier Assembly

(AWG-042)

5PConnector

Assembly

(AWX-062)

ControlAmplifierAssembly

(AWG-0411

FilterAmplif

ierAssembly

(AWM-089)

Microphone

Jack

Assembly

(AWX-@71

Pourer

AmplifierAssembly

(AWH-048)

Speakers

SwitchAssembly

(AWS-G}S)

Protection

CircuitAssembly

(AWM-091)

Stabilizer

Assembly

(AWR-l

06)

Power

Supply

Assembly

(AWR-I07)

PACKING

PARTS

LIST

EXPLODED

VIEWS

SUPPLEMENTS

FOR

SX-l250/HG

ANDSX-1250/5

15.1 Contrast

ofMiscellaneous-parts

.. ........101

15.2 Schematic

Diagramfor

SX-1250/S .....lO3

15.3 SchematicDiagram

forSX-l2sOlHG. ..... lOb

15.4 De-emphasis

SwitchAssembly

(AWX-101,

for

type) .. .....1O7

15.5 Speakers

SwitchAssembly

(AWS.098,

for

HGtype) ........ 108

15.6 Poriver

SupplyAssembly

(AWR-108,

for

HGtype) .........110

13.

14.

15.

1.SPECIFICATIONS

Semiconductors

FETS.... ...... 5

|Cs..... ......6

Transistors ......82

Diodes

.. ......60

PowerAmplifierSection

C.ontinuous

PowerOutputfrom 20 Hertz

to 20,000

Hertz

(Both

channels

driven).. 160

watts

per

channel

ohms)

200watts

Per

channel

(4ohms)

Total

HarmonicDistortion

(20

Hertzto 20,000Hertz,

from

AUX)

ContinuousRated

PowerOutput.. . Nomorethan0.1%

watts

per

channel

power

output,

8ohms . . . Nomorethan0.05%

1watt

per

channel

power

output,8ohms . . . Nomorethan

O.O7%

Intermodulation

Distortion

(50

Hertz: 7,000Hertz

4: l,

fromAUX)

Continuous

RatedPower

Output.. . No morethan

0 1%

watt!

per

channel

power

output,8

ohms . . . Nomorethan

0.05%

1watt

per

channel

power

output,Sohms . . Nomore

than

0.O1%

FrequencyResponse

. .. ... . . .5H2to

100,000H2ildB

InputSensitivity/

mpedan

POWER

Ar\4P

|N.........

Output

Speaker..

Headphone

DampingFactor

.......1V/50kohms

A, B,C,A+8, B+C,A+C

...... Lowlmpedance

(20H2

20,000H2,8

ohms). .......30

HumandNoise

(lHF,

short-;ircuited,

A Network)

. .100d8

Preamplif

ierSection

InputSensitivity/

lmpedance

PHONOI

PHONO

t\4tc....

AUX,..,

TAPEPLAYI.....,

TAPLPLAY2......

TAPEPLAY

2 (DlN

conne(lor).

. .

PHONOOverload

Level

(T.H.D.

0.1%)

PHONO

OutputLevel/l

mpedance

TAPL

RECI ...,.

TAPERLC2......

TAPE

REC2(DlN

connector)

.. .

PRE

OUT

Totallllrmonic

Distortion

(20Hr

ot 20,000Hr,

IV ourpur) . . Nomore

thanO.02%

Frcquency

Rcsponse

PHONO

IAAequ,rlizrrion).

.30}12

ro15,000H2r0.2dB

AUX,TAPE

PLAY

....... tOHzto50,000H.,lldB

ToneControl

BASS...

I'REBLE

Filter

LOW....

lV/1k

ohms

80dB

74dB

0.1%

HIGH

,..

Loudness

Contour

(Volume

control

set

at 40dB

position)

. . . . .+6dB

(100H2),+3dB

okHz)

Hum and Noise

(lHF, short,circuited,

A Network,

rated

power)

PHONO........

AUX,

TAPE

PLAY

l\4uting

FM Section

Usable

Sensitivity.. . l\40No

STEREO..

Usable

Sensitivity

(lHF'58)

.....

50dB

Quieting

Sensitivity....

l\40No . . .

STEREO..

Signal-to-Noise

Ratio at65dBf . .

Distortion

at65dBfl00Hz.....

lkHz. . . . . .

6kHz

. . [4AlN 1l0dB

(l00Hz)

SUB t sdB(s0Hz)

. . l\4AlN 1'l0dB

(tokHz)

SUB t 5dB

(20kHz)

.. 30Hz

(12dB/oct.)

. . 8kHz

(12dB/oct.)

... 75dB

...90dB

. . 20dB

8.7dBf

(3.orv/300s})

la.sdBf

(s.8gV/300[l)

. . 1.5irV

11.sdBf

(a.1pV/3000)

36.0dBf

(69sV/300())

MONO.......

STEREO.....

i\40No......

STEREO....

MONO......

STEREO....

0.25%

.0.1%

. 0.2/o

. 2.5mV/50k

ohms

. 2.5mV/50kohms

. 6.5mV/50k

ohms

.150mV/50k

ohms

.150mV/50k

ohms

. I50mv/50k

ohms

.150mV/50k

ohms

. . 500mV

kHz)

. . s00mV

(1kHz)

........150mV

. 30mV/80k

ohms

Frequency

Response

...l\40No....... 0.3%

STEREO.. . .. O.3Vo

. . 30Hztol5,000Hri?

3dB

Capture

Ratio ..........l.OdB

AlternatcChannelSelectivity ........ 83dB

Spurious

Response

Ratio... .......11OdB

lmage

Rcsponse

Ratio

... .........110d8

Response

Ratio

... ...120d8

AMSuppression

Ratio... .........60d8

/VlutingThreshold .....13dBf(4.9pvl3004)

Stereo

Separation

. . 50dB

(lkHz),

35dB

(30H2-t5kHz)

SubcarrierProductRatio .......... 14dB

SCARejection

Ratio... ..........74d8

AntennaInput 300ohms

balanced

ohmsunbalanced

six-1 Elscl

A\,?

AM Section

Scnsitivity

(lHF,

Ferritcantenna)

(lll

F,Ext.antenna)

Sclcctivity

Signal-to-Noise

Ratio

........

lmage

Rcsponse

Ratio.......

lFRcsponse

Ratio.. .

Antenna

l\4iscellaneous

PowerRcquircmcnts ... 120V

60HZ

.......6s0w(uL,csA)

'1200W

(max.)

Powcr

Consumption

Dimensions........

556(W)x186.5(H)

x464.5(D)

21-7l8(w)

x7.3/8(H)

x 181/4(D)

Weight

Without

Packag€

. . 29.2kg(641b

4 oz)

WithPackage ..... 33.2kg

(73

lb1oz)

Built'inFcrrite

......300pV/m

.........l5irv

.........40d8

.........55d8

.........65dB

.........85dB

Loopstick

Antenna

Furn

ished

Parts

Fl\4

T-typc

Antcnnd

. .

Opcrating

Instructions

Hex.

Wrench

NOTE:

Specifications

ond thedesigtr

subject

to possible

modifica.

tion uithout noticedue to improuements.

sHEX WRENCH

The accessoryHex. wrenchis provided

for removingthe

VOLUME and TUNING knobs, or for tightening its

setscrewin theeventit becomesloose.

If required,loosenthe setscrew

by insertingthe wrench

into the hole on the side of the knob and tuming the

wrench counterclockwise. Be particularly careful not to

scratch

the front panel

whenemploying

the wrench.

2. FRONTPANEL FACILITIES

FUNCTION

SELECTOR

BUTTONS

To selectthe program

source,

push

eachbutton as

follows:

NOTE:

Only one FUNCTION button shouldbedepresaed

ot o

ttme.

......... For

AMbroadcastreception.

PHONO

.....

AUX

........

oooA

\-' o

. . . . For FlVl

stereoreception.

Automatically

receives

monophonicallyduring

FlVlmono-

phonic

broadcasts.Th0 5TE

REOindic.rror

liihtsupwhen

lhebr"J,lL.r.tr\ n

\lcrcu.

PHONO

2/MtC.

TAPE

DUPLICATE

SWITCH

Set thi5switchin the ON (down) position

to duplicate

or edit a recorded

tapeusingtwo tape

decks.

To operate

aturntable

connected

to the

PHONO1 input

jacks.

For listening

to audio

component

(car-

tridgetape

player,

TV sound

tuner,etc.)

connected

to theAUX input

jacks.

As abovefor PHONO2 iacks,

or for

reproduction

through

microphonescon-

nected

to the Mlc iack

ison thefront

panel.

Note, when

the

microphone

connectedto the iack the turntable

connectedto the

PHONO2

iacks

cannot

Deuseo.

VOLIJMECONTROL

AND AUDIO MUTING

SWITCH

The extremely high power output of the SX-1250

can be finely controlled by combining the cali-

brated VOLUME control and the AUDIO MUT-

ING switch.

The AUDIO MUTING switch can also be used to

briefly lower the volume when changingrecords or

taDes. r

VOL!ME

.-.

IrtI

ADAPTOR

SWITCH

When

employing

adaptorcomponents,

suchasa graphic

equalizeradaptor,

RG processor,

or Dolby NR adaptor,

depressthis

ADAPTOR

switchto ON.

s?F$

TAPE

MONTTOR

(1,

2) SWTTCHES

Set

theseswitchintheON (down)position

asfollow:

1 .. .. With a taDe deck connectedto the TAPE I

jacks (REC and PLAY), either playbackor

monitoringof a recording

in progre5s

arepos-

sible.

2 .. .. Sameasin 1 above,with a tapedeck

connected

to the

TAPE2jacks

(REC

andPLAY).

For

normaluse,leave

in theOFF (up)positions.

SPEAKERBUTTONS

Three

setsof speaker

terminals,A, B,andC,are

provided

on therear

panel,

andtherequiredspeaker

systems

canbe

selectedbydepressing

theSPEAKERS

buttons

asfollows:

A ........... Speaker

systemsAoperate

B ........... Speakersystems

Boperate

C ,.......... Speakersystems

Coperate

NO?ESr

1. Whetr any two buttons (A+8, B+C, C+A) ore de'

preaeed

simultaneously, the eorresponding

pairs of

speakersystems

will comeinto operation.

Howeuer,

is not possible

to operote

all three

speaher

systems

the same time, euen though all the buttons ore

depressed.

2. For priuote listening through heodphones,

return all

the SPEAKERSbuttons to the OFF (undepressed)

Dosition.

PHONES

'ACK

Acceptsstereo

headphones.

WARNING:

Do notpluga microphoneinto thePHONES

jachosmay

domagethe microphone.

POWERSWITCH

After turning

thisswitchON thereisa

delayof some

6to

8 seconds,during which time the protection circuit

operates

to eliminateunpleasantnorse.

TWINBASSCONTROLS

Adiustlow frequencytone.

100H2: Adiustsfrequencybandbelow

400H2.Control

effectiveness

at 100H2

r10dB.

50Hz: Provides

additionalcontrolfor the frequency

band below 200H2.Control effectiveness

50Hz

r5dB.

TONESWITCH

IntheOFF (up)position,

this

switch

causestheamplifier

section

to operatewith a flat frequencyresponseregard'

lessof the

tonecontrol

setting.

FMTUNING

METER

With the SIGNAL meter needledeflected

make fine adiustment

by centering

the FM

meter

needle

(indicating

optimum

reception).

SIGNAL

METER

the right,

TUN

ING

TUN

Sele,

obse

stGl

Ft\4|

Lear

ForAN4

and

Al\4

tuning:

FMtuning:

Flvlstation

tunings.

Tune for maximum deflection of the

SIGNAL meterneedle

to theright.

Both

the

SIGNALand

FMTUNING

meters

work together.Theoptimum point of the

SIGNAL

meter

needle

thesameas

tuning.Then

usetheFl\4TUNING rn€ters.

supF

tw€{

supF

oepr

SPEAKER

SYSTEMINDICATOR

FMSTEREO

INDICATOR

LOWCUT (30H2)

FILTERBUTTON

whenlow-oitched

rumble{fromturntable

motoror other

source) is obstrusive

depressthis button to provide

l2dBloctave,attenuation

at frequencies

below 30H2.

nointerferenceisexperienced,release

thisbutton.

HIGHCUT

(8kHz)

FILTER

BUTTON

When

highfrequency

scratchnoise

(from

wornrecords

othersource)isunpleasant,depress

thisbuttonto provide

12dB/octaveattenuationat frequencies

above8kHz. lf

thereisno interference,releasethisbutton.

Whr

oepl

the

tnts

Adi

10k

TWI

20k

I of the

G meters

nt of the

m€Iers.

TOR

orother

provide

lOHz.

rcords

,provide

3kHz.lf

TUNINGKNOB

Selectthe station

and tune for optimum reception

observing

the SIGNAL meter

for AlVl

stations,

andboth

SICNALand

TUNINGmeters

for FMstations.

FMMUTING

BUTTON

Leavethis button undepressed

(in the ON position)

suppressunpleasantinterstation

noise

while tuning be-

tweenFl\4stations.

Low-strengthsignals

may also be

suppressed

by thisfunction,

to pickup aweakstation

depressthis

buttonto the

OFF position.

PROGRAM

SOURCE

INDICATOR

FM MULTIPATHBUTTON

When selecting

the bestpositionfor the Fl\4antenna,

depressthis button sothat multipathnoiseis heard

from

the speaker

systems.To listen

to FN,lbroadcasts,

release

thisbutton.

TWIN

TREELECONTROLS

Adjustshighfrequencytone.

1okHz: Adjustsfrequency

bandabove2.5kHz.

Control

effectiveness

at lokHz isr10dB.

20kHz: Providesadditionalcontrol for the frequency

band above 5kHz. Control effectiveness

20kHzis

r5d

six-1 e50

MIC

JACKS

(L andR)

Forconnecteachchannel

jack5

the left

andrightchannel

microphone5.

NOTE:

Usethe hEh impedance

(oboue

20ks7)with 6mm diatn.

phoneplugs.

VOLUMECONTROL

Adjusts

output levelto speakers

andheadphones.

Scale

isgraduated

in dB, and when usedin conjunction

with theMUTINGswitch,finer

andwiderrange

attenua-

tion canbe performed.

Seeadditionaldescription

page

AUDIOMUTING

SWITCH

_2OdB

Depressthis switch to attenuatethe audio output by

20dB.

Thisconvenient

featuresaveshavingto disturbthe

VOLUME control,for example

whenansweringthetele-

one.

LOUDNESSSWITCH

Depress

this switch when listening

at low volume.The

frequency

responseof the humanearvariesaccording

the listening

volume,and the depressed

position

com-

pensates

for hearingresponseby emphasizingthebass

and

treble.

IIIODESWITCH

For stereo

playback,

leavethis switch undepressed

(or

depress

to release,if alreadydepressed).

Whendepressed

for MONOplayback,

leftandrightchannel

stereosignals

will be mixed to produce

monophonicsound

from both

speakersystems.

BALANCE

CONTROL

Adjusts

the balance

between

thesound

volumefrom the

leftandrightspeaker

systemsorheadphones.

right,

o6ru'"-6*6

3.CONNECTIONDIAGRAM

TURNTAELE

OUTDOOR

FMANTENNA

T.TYPE

FMANTENNA

TAPEI

3O0A teeder

FM OE.EMPHASIS

SWITCH

Normally, set this swatch to "75!s". Be sure to set ir to

"25ps" only when listening to an F[, broadcast (pre-

ernphasis; 25rrsec.l with a Oolby' system NR adaptor con-

nected berween the ADAPTOR OUT and ADAPTOR lN

* The word "Dolby" i! a trademarkof Dolby Laboratories

Inlj.

ffi-[] 4.V

GND

TURNTABLE

RIGHT LEFT RIGH'

SPEAK

SYSTEMSA

IAPE OECK

(open{eel,

casselre}

LINE LINE

INPUT OUIPUT LINE LINE

INPU-T OUTPUT

irulr(il -00r0r ftrovt ScRtyis

yr 30rrtr 0Tct

DOLBY

NR ADAPTOR 4 CHANNEL DISCRETE

FM ADAPTOR

ose

. I e0

LINE LINE

INPUT OUTPUT

PR€/POWE

R AMP

The bridg€ connecting

plugs beiween pRE OUT and

POWER lN iacks

shouldalwaysbe teft in position in

normal us€. ll rhey are disconnected

or removed,

soundwill come from the speakers.Atwaysbesureto

swatch off the power supply before artempring to

CONVENIENCE

OUTLETS

Unswitchod: Less

frequenttyused

components,

which do

l2O0W

max.) not require

coupled

power,

can be

ptugged

into eitherot theseoutlets.

A frequ€ntlyused

component (turntabte,

tape

deck. elc.) can be plugged into this outlet.

By leaving the power switch of rhat compo,

nent in the ON position, povver

suppty

ro the

componenr wi

be coupled

with thesx_1250

switch

operation.

lr tP

t-t t-t t-l

t=Jt=Ju Switchsd:

(sow

max.l

Itl:i.i+l rl '

RIGHT LEFT RIGHT

SPEAKER

SYSTEMS

8SPEAKER

SYSTEMSC

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