Pioneer SX-303 Manuel utilisateur

:-_

(DrrloNEEFl'

ORDER

NO.

ARP-

232-0

AM/FM STEREO

RECETVER

sixr3Gl3

o Thisservicemanual

isapplicable

to the KU types.

Forservicing

of the othertypes,

please

refer

to the

additional

service

manual.

o Ge

manuel

d'instruction

serefdre

aumode

der6glage,

enfrangais.

o Este

manual

servicio

tratadelm6todo

ajuste

escrito

enespafiol.

CONTENTS

SPECIFICATIONS

FRONT

PANEL

FACILITIES

PARTS

LOCATION

BLOCK

DIAGRAM

CIRCUIT

DESCRIPTIONS

PACKING

EXPLODED

VIEW

ANDPARTS

LIST

8. P.C.

BOARDS

CONNECTION

DIAGRAM 12

9. SCHEMATICDIAGRAM 15

10. ELECTRICAL

PARTS

LIST

. . 17

11. DIALCORDSTRINGING ...... 19

12. ADJUSTMENTS... 20

nEcucr 22

AJUSTE ... 24

PICINEEFI ELECTFICINIC CclFlPClFIATIClN 4-1, Meguno 1-chome, Mesuno-ku, Tokyo 1F3, Japan

FIC|NEEFI ELECTFICINI€9 IUAAI lNC. 1925 E. Dorninguez St., Long Beech, Catifonnia gOB1O U.S.A.

FfoNEEFI ELEcrFloNlc [EuFtoPEI N.v. Keerbengtean 1,e74o Bevenen, Betgium

PI('NEEFf ELECTFICINIGB AUaTFIALIA FTY. t-lO. lzA-le4 Boundany Ftoad, Bnaeside, Victonier 819F, .Ausrnatia

MODEL

SX-303

(SX-303L)

COMES

IN FIVEVERSIONS

DISTINGUISHED

AS FOLLOWS:

Model Voltage Remarks

sx-303/KU AC120Vonly U.S.A.model

sx-303/Kc AC120Vonly Canada model

sx-303/s AC110V, 'l2OV

,22OV and

24OV (switchabte) Generalexport model

SX-303L/HE AC220V only European

continentmodel with AM-LW bandtuner

sx-303L/HEZ AC220V only Westgermany model with AM-LW band tuner

YX O DEC.

1982 Printed

lapan

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SPECIFICATIONS

Amplifier Section

Continuous

Average

Power

Output

watts*

per

channel,

min.,

ohms

rom

40Hertz

to 20,000

Hertzwith

than

0.3o/ototal

harmonic

distortion.

TotalHarmonic

Distortion(40

Hertz

to 20,fi)0 Hertz,

I ohms,fromTAPE)

continuousrated

povrrcr

output Nomorethan

0.3%

22.5watts

per

channel

power

output

. . . . Nomorethan

O.15yo

Iwatt per

channel

power

output

l*"r..irr"ii""oiri.r,i""it,i""r,rlrt,ill'iJir1"=t;?1,

8 ohms,

fromAUX)

continuousrated

power

output Nomore

than

0.3%

DampingFactor

(1kHz,

8 ohms) 22

nput (Sensitivity/l

mpedance)

PHONO .....2.smV/S0kilohms

TAPE

PLAY . . . 150

mV/50

kilohms

Phono

Overload

Level

(T.H.D.0.1%.

1,000H2)

PHONO . . 150mV

Output Level

TAPE REC . 150mV

SPEAKER A, B,A series

B,off

Frequency

Response

PHONO

(RIAA

Equalization)

. 30Hz

to 20,000H2t0.5d8

TAPE PLAY 15Hzto SO,OOOHz+]OA

Tone

Control

BASS

. i9dB (100H2)

TREBLE 19dB

(10kHz)

Loudness

Contour

(Volum

control

setat-40d8position)

. . +8dB

(100H2),

+6dB

(10,000H2)

Humand

Noise

(lHF,

shortcircuited,A network)

PHONO

MM .. 71dB

TAPEPLAY ......97d8

FM Tuner

Section**

UsableSensitivity.. .10.7d8f(O.9pV)

50dBOuieting

Sensitivity

MONO ...15.3dBf

(1.6pV)

STEREO ..37.6d8f (211ty1

Signal-to-Noise

Ratio

MONO ...75d8(at85dBf)

STEREO . . 70dB

(at

85dBf)

Distortion

(at65dBf)

MONO lkHz. ...0.3Yo

STEREOlkHz. ...O.6Yo

CaptureRatio. ..2.5d8

Alternate

ChannelSelectivity

(400kHzl . . 50dB

Stereo

Separation

(lkHz) . .35dB

FrequencyResponse .. 30HztolSkHz,1ffOt

SpuriousResponseRatio. ......7ft8

lmageResponseRatio ....45d8

lF ResponseRatio. ....100d8

AMSuppressionRatio ...45d8

SubcarrierProductRatio. ......31d8

MutingThreshold 27dBf

(6.3pV)

AntennaInput

. . . 300ohms

balanced,75ohms

unbalanced

AM Tuner

Section

Sensitivity

fHF, Loopantenna 32O1N

lHF,Ext.

antenna 30gV

Selectivity .2ft8

Signal-to-NoiseRatio . . . ..43d8

lmageResponse

Ratio ....40d8

lF ResponseRatio. .....45d8

Antenna AM LoopAntenna

Miscellaneous

Power

Requirements . AC120V, 60Hz

Power

Consumption. . . 190Watts(UL),

22SVA(CSA)

Dimensions . . . 42O

(W)

x 98 lHl x 214

(D)

16-9/16(W)X 3-718(H)

X 8-7116(D)

Weight

(without

package) . .5kS

(11

tO)

FurnishedParts

FMT-typeAntenna ......1

AMI-oopAntenna ........1

Operating

Instructions 1

'Measured pursuant to the Federal Trade Commission's Trade

Regulation rule on PovverOutput Claims for Amplifier.

**FM muting functions with this unit when the signals are weak.

The unit's internal wires are therefore treated so that the signals

are not muted when the sensitivity is measured.

NOTE:

Specifications and design subject to possible modification without

notice.

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FRONT

PANELFACILITIES

O powen

swrrcH

Push

this to wrritch

on andoff the unit's power.

Power

suppliedat the depressed

(r) switch

position

(ON)

and

turned

off atthereleased

(I) position

(OFF).

@ HenopHoNE

JAcK

Connectthe plug on the stereoheadphones

to this jack

whenlisteningto soundthrough

headphones.

@rorue

coNTRoLs

BASS :Thebass

isincreased

whenthiscontrol

isrotated

clockwisefrom the center

position

andreduced

whenrotated

counterclockwise.

TREBLE :

The treble is increased

when this control is

rotatedclockwise

from the center

position

and

reduced

whenrotated

counterclockwise.

@ eeLeNcE

coNTRoL

This is normally

kept at its center

position.

lt is rotated

when

the volume

of sounddeliveredthroughthe left and

right

channelsof thespeakersor headphones

differs.

The right channelvolumeis reduced

whenthe control is

rotatd toward the LEFT from the center position while

the left channel volume is reducedwhen it is rotated

toward

theRIGHT.

@rurucrroN

swrrcHEs

PHONO :Presswhenlistening

to records.

FM :Press

whenlisteningto FM broadcasts.

AM :Presswhenlistening

to AM broadcasts.

@rape (ADPT)

swrrcH

This is depressed

when usinga tape deckor adaptor

unit

connected

to therear

panel

TAPE/ADAPTOR

jacks.

o LouorrrEss

swtTcH

Depress

this svrritchto the ON position when listeningto

soundat a low level

of volume.This

will enhancethe bass

and treble and givemore life to the soundevenat a low

volume.

@ voluruE

coNTRoL

Use this to adjustthe volume of the sounddelivered

through

the speakersor headphones.

The volume is increased

when this control is rotated

clockwisefrom

theminimum

"0" position.

@ ruruIruG

tNDIcAToR

(TUNING)

Thislightsup to indicate

that an FM,AM stationhas

been

tunedin.

@ sreneorNDrcAToR

(srEREo)

This lightsup automaticallywhen an FM stationbroad-

castingin stereo

hasbeen

tunedin.

@speerERs

swrrcHEs

Theseare usedto select

the speakersthrough which you

will listen

to thesound.

Theselected

speakersarenowworking.

A: The sound is heard from the speakersconnectedto

the

speaker

A terminalsontherear

panel.

B: The sound is heard from the speakersconnectedto

the

speakerBterminals

ontherear

panel.

No sound

will be

heard

when

SPEAKERS

A andBswitches

are both released.

This isthe positionat whichthe sound

can

beheard

through

theheadphones.

NOTE:

No rcund will be heard through the spakers when both the A

and B switches are depressed if only one set of speakershas

been

connected to either the A or I SPEAKE RS terminals.

@ FREoUENcY

scALE

This indicates

the frequencyof the broadcasting

station

(FM,

AM).

The

top levelfigures

(88

- 108)

indicate

theFMband.

The bottom level

figures

(55- 160)indicate

theAM band.

@ TUNTNG

KNoB

Rotatethisknob

to pick

stations

(FM,

AM).

@ POWER

|ND|CATOR

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3.PARTS LOCATION

FrontPanel

View

Speakerknob

AAD60A

Front panel

assembly

NOTES:

. Parts without part nu ber connot be supplied.

. The b morh found on aome component ports indicates the importonce of the

sofety factor of the port- Thereforc, uhen replocing, be 6ure to use

ports of id.enticol

designation.

. For your Potts Stock Control, the fost mot)ing items are indicated u)ith the moths

ta and l.

'' GENERALLY MOWS FASTER THAN '.

Thb claesificotion shall be odjusted by eoch di;tributor becouseit deDends on model

numbe f, temperature, humidity, etc.

Bonnet

ANE4lO

ANM-293

AAD$O5

..-":.n

f\,- KnobA (vo LU1ME)

AAB316

FunctionknobA

{TAPE,

LOUDNESS)

AAD€06

Function knob B

(PHONO,

FM,

AM)

AAD607

Phone

jack

AKN-(X5

Knob B

(BASS,

TREBLE,BALANCE)

AAB3I7

RearPanelView

Earth terminal

Complexterminal

AKX{73

TopView

l\r*t Fuse

(T2.5A)

AEK-123

A** Pushswirch

(POWER'

ASG-541

A ac socket

AKP.O39

AWB{44

** tc

M5153L

Switchassembly

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4.BLOCK DIAGRAM

FRONT

END (1/3)

| 3OOO

. BAL

L rrrupar

l- cND

I LOOP

L ANT

MIX AMP

LED DRIVER FM

MUTE

AM FRONT

ENO

[5dtl sr-l

PHONO

(Lch)

FM(Rch)

l- crav

Lch REC

,"o"o

f eiror,ro

Rch REC

".o"

sr-4

TAPE

(t/? )

sr-5

UONESS

(?/2) TONECONTROL

vR2-2,2-3

EQUALIZERAMP

lzsmrl

t'EryI pHoNEs

r_-

134,4/41

Rch

SPEAKE RS

r20v

+92

(

15.4V

s2-2

SP- B

(vzl

s2-l

SP-A

lt/2)

lI"o

],, ^

SI-l : FUt{CTION

(PHOtlO)

SI-2: FUNCTION

{FM)

sr-5 : FUt{cTroN

( AM)

SI-4 : TAPEMONITOR

sr-5:LouoNEss

9!L- oFF

oN -.9!E

oN -.g_Eq

--qEE

or -_q!! S2.I : SPEAKERS

S2.2: SPEAXERS

I_9_l!-

- oFF

!-!L - oFF

FM.IF AMP

FT.IIF,/OET MPX

RE6ULA.

rfrR

METER

OETECTOR

r-;1-l

rcr i lrJ i

Itfr I

lt/2) | (t/4)

ffi--D"t o='""o'

POWERAMP

sr-4 sr-5

|2/2t (2/2

)

AM IF AMP

+82 AM

POWER

ON,/OFF MUTING

POWERSUPPLY A PROTECTOR

sror i PoWER oil - oFF

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CIRCUITDESCRIPTIONS

FM Front End

A unitized variable capacitor type front end

unit is used consisting of an FET RF single stage

amp, local oscillator/mixer IC and an IF trans-

former.

FM lF Amp, DetectorandMPX Circuit

A 2-transistor IF amp with ceramic filter is used

and the next stage

hasan IC (M51533L) contain-

ing the FM IF detdctor andMPX circuit. The block

diagram

of IC M51533L is shownin Fig. 5-1.

This

IC uses a peak detection method which can be

adjusted with a single coil. The PLL method is

employed to reconstitute the 38kHz sub-carrier

for the MPX circuit.

The IF signalis input at pin 1 andthe detection

output is obtained from pin 5. The detection out-

put passes

through the muting Q4, goes

to pin 9,

passes through the MPX circuit and the stereo

signals are obtained frorn pins 11 and 1'2. In

addition, this unit detectsthe presence

or absence

IL OUT ROUT

of a pilot signal to automatically switch between

stereo and mono reception by R14 which is con-

nected to pin 14. When a stereosignalis received,

pin 13 drops to the low level to light the stereo

indicator. When pin 2 is grounded, the PLL VCO

and FM IF operation stop (for AM).

FM Mutingand LED Driver

With this unit, muting is automatically activated

when the antenna input drops below 10pV. As the

antenna input decreases, the voltage at pin 3

drops, Q5 is turned off and Q6 is turned on. As a

result, the gate voltage of Q4 drops, Q4 is turned

off and the detector output circuit is blocked

(Fig. 5-1). When an FM or AM station is tuned

in, the base

potential of Q5 is raised,Q5 isturned

on and the tuning indicator lights.

nrtr F?? |

OETECTOR

INPUT

BUFFER

LEVEL

METER

CIRCUIT

TER

rTC

Fig.5-1 FMlF,Detectorand

MPX

circuit

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AM Tuner

This uses a variable capacitor type tuning

circuit composed of three transistors, a 2-fuan-

sistor front end and a single transistor AM IF

detector.

AF Section

The equalizer circuit has a low-noise operation

amp(2 channel)M5218P.

The power amp hasa 45 watt output power IC

STK4141-2S

(See

Fig.5-4).

The tone control circuit is placed in the negative

feedback

loop of the power amp.

Protective

Circuits

This unit has a circuit to detect DC voltages

the power amp outputs and a muting circuit that

operateswhen power is turned on and off.

Fig. 5-2 shows the construction of the DC

voltage protection circuit. When a DC voltage

appears at the power amp output, either Q13

(plus) or Q14 (minus) is activated depending on

the polarity of the DC voltage and a trigger is

applied to D15. This turns on D15, +81 isshorted,

the fuse on the primary side is cut and the power

supply circuit is shut off.

Fig. 5-3 showsthe power on/off muting circuit.

Time constant t1 is longer than t2 so that imme-

diately after the power is turned on, the emitter

potential of Q15 exceeds

its base

potential, Q15 is

turned on to activate Q16 and Q17 and ground the

signal. A few seconds later, the base potential of

Q15 rises

to turn off Q15 alongwith Q16 and e1Z.

When the power is turned off, the charge of

C161 passes

through D18; it is almost completely

discharged in an instant to make the base

potential

of Q15 zero. However,because

the charge

of C160

remains, Q15 is turned on and muting is activated

in the same manner as when power is turned on.

SPEAKE

SWITCHES

Fig.

5-2 DC

Voltage

protection

circuit

TOPOWERAMP tr,r2

POWERAMP

( Lch)

Fig.5-3 Power

ON/OFF

muting

circuit

const

ont

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rNr(+)l

l(-

)

PACKING

OUT2

Equivalent

circuit

of power

tN2(+)

rN2(-)

GND 68

MUTING

Fis.5-4

VEE

fiI

OUT

Mark No. Part No. Doscription

AHA.335

AR8526

ATB{76

ADH.OOS

AHE-107

Sidepad

Operating instructions

(English

)

Loop antenna assembly

T-type antenna

Packingcase

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T.EXPLODEDVIEW

AND PARTS

LIST

NO?ES:

o Partswithout part number cannot be

supplied.

o The S marh found on some component parts indicates the importance of the

safety factor of thepart. Therefore, when replacing, be sureto use partsof identicol

designotion.

o For your Parts Stoch Control, the fast mouing items are indicated with the morhs

t* ond *.

*T GENERALLY MOWS TASTER THAN ).

This classification shallbeadjusted by eachdistributor becauseit depends on model

number, temperaturc, humidity, e

tc.

lVlark No. Part No. Decriptions

Mark No. Part No. Description

1. ANE410 Bonnet

2. BBZ30P080FZK Screw

x 8)

A * 3. ATT-944 Power

transformer

{120V}

4. PMZ30PO60FMC Screw

(3x 6l

5, AAD€O8 Speaker

knob

6. VMZ30P06OFMC

Screw(3x6)

7. NK9OFUC Nut

8. AAB-317 Knob

{BASS,

TREBLE,

BALANCE}

9. NKT0FUC Nut

10. AAAO84 Tuningknob

11. A48-316 KnobA (VOLUME)

12. ANM-293 Frontpanel

assembly

13. AAD€07 Function

knobB (PHONO,

FM,

AM)

14. AAD€06 Function

knobA (TAPE.

LOUDNESS}

A ** ts. ASG-541 Pushswitch

(POWER)

16. AAD€05 Powerknob

17. AEC-784 Cabinet

bumper

18. AXA-373 Tuning

shaft

19. AEC471 Nylonrivet

20. MTZ3OPIOOFZK Screw

(3x 1O)

a ** z't. AEK-123 Fuse

(T2.5A)

A 22. AKP-039 ACsocket

A 23. ADG-073 Ac power

cord

24. GWM-265 Complexassembly

25, AKN-045 Phone

Jack

(PHONES)

** 26. SUJSLYXSF Speaker

switch

A 27. ACGO17 Ceramic

(0.01

)

24. BBT30P080FZK Screw

(3x 8)

50.

51.

52.

53.

54.

55.

56.

57.

58.

59.

60.

61.

62.

63.

64.

Speakerswitch assembly

Switch holder

Pullyassembly

LED assembly

Earth

Mountingplate

Pully assembly

Pully holder

Headphone

jack

assembly

Chassis

Bottom Plate

Binder

Earth terminal

Rearpanel

Tuningdrum

Smoother

Pointer holder

Pointer assembly

Heat

sink

Wire holder

65.

66.

67.

68.

69.

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/dt"'

/r"t"

2te@

\--.

8l?'v

,6rff h<;

CK\@ l-F

\gw@

AYZ+'-'

7-\

"JFi

/F/

t-'-'

2z\ a

i \lg

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