Pioneer SX-202 Service manual

(v)

rrtoNeerl

AM/FM

STEREO

RECETVER

sx-?;0e-

MODEL

Modol

SX-202/KU

sx-202/Kc

SX.2O2

sx-202/s AC11OV

sx-202lYP

SX-202L/HE AC22OV

sx-202LlHEZ

o

This service additional

o

Ce manuel d'instruction

.

Este

manual de servicio

(SX.2O2LI

AC12OV only AC120V

AC240V

AC220V only

manual is

service

manual.

COMES

only

,12OV ,22OV

only

IN SIX VERSIONS

Volteg€

and 240V

applicable to the KU

se refdre

au

mode

trata del m6todo de

DISTINGUISI.IED

U.S.A. model

Canada model

{switchable} General export model

types.

de r6glage,

For

en

aiuste escrito en

Australia

European

West Germany

servicing

frangais.

model

continent model with AM,LW

model with AM-LW

of tlte other types,

espaiiol.

ORDER ARP-230-O

AS FOLLOWS:

R6mrrks

band runer

band tuner

please

refer

NO.

to the

CONTENTS

't.

sPEctFtcATtoNs

2. FRONT

3. PABTS

4. BLOCK DIAGRAM

5. CIRCUIT PACKING

6.

7.

EXPLODED

FICINEEFI PICINEEFI PIGINEEFI PICI|YEEFI

PANEL

LOCATTON

DESCR IPTIONS

ELECTFICINIC ELEC:THONICB ELEC?FIC,NlC ELECTFIEINICB

.

FACILITIES

VIEW

AND

. . .

.

. . . . . . .

PARTS

IUBAI

[EUnclPEI

AUBTFIALIA PTY.

LIST

GCIFIPCIFIATION a I, Mesuno

lNC. 1925

N.V. Keerbenglssn 1,

.

. .

E. oomnguez

LTE!. 178-1821

P.C.

8. 3 4 5 6 8 9

9.

10. ELECTRICAL PARTS I1.

12. ADJUSTMENTS

SE., Long Beach,

2740 Beve.en,

tsounde.v Fosd, Bnaesde, Vrcco.

BOARDS

SCHEMATIC DIAGRAM

DIAL

COR D

REGLAGE

AJUSTE.

1 Ljhome, Mesu.o-ku,

Cahfo.nra

Eletg,um

CONNECTION DIAGRAM

LIST

STRINGING

,. ,.

go8lO

YX

Tokyo 1::3, Jspen

u.S.A..

a 3195. a.usc.atr€

O DEC.

1982

Printed

in

12

t5

17 19

20

laDan

1. SPECIFICATIONS

Amplifier

Continuous

watts*

40Hertz

than

Total Harmonic Distortion

ohms,

8

continuous

12.5 watts

1 watt

Intermodulation

ohms,

8

continuous

Damping

I nput

PHONO .....2.5mV/5Okilohms

TAPE PLAY

Phono Overload

PHONO

Output

TAPE REC SPEAKER

Frequency Response

PHONO

TAPE PLAY

Tone

BASS TREBLE

Loudness frntour

Hum and

PHONOMM.. TAPE

FM

*UsableSensitivity

50dB

**MONO

STEREO

Signal-to-Noise

MONO STEREO

Distortion

MONO

STEREO

Section

Average

per

channel,

to 20,000 Hertz

0.3%o

(Sensitivity/l

Control

Tuner Section

Ouieting Sensitivity

tolal harmonic

from

TAPE)

power

rated

per

channel

per

channel

fror;'r AUX)

rated

Factor

Level

(RIAA

.

Noise

PLAY

(at

65dBf)

power

Distortion

power

(1

kHz,8

mpedance)

(T.H.D.0.1%,

Level

Equalization)

(Volum

+8dB

. .

(lHF,

short circuited,

Ratio

1kHz. lkHz.

Power 0utput

min.,

at

ohms

8

with

no more

distortion.

(40

Hertz

to 20,000

output

No more than 0.3%

power

output

No more than 0.15%

output

No more than O.2o/"

(50

Hertz:7,000

output

ohms)

'

150

.... A,

. 30Hz

....

control

to 20,000H2t0'5dB

l5Hzto50,000Hz+ldB

...

set at-40d8

(100H2),

...10.7dBf

....15.3d8f

....75d8(at85dBf)

Hertz

more than 0.3%

No

mV/50 kilohms

1,000H2)

B,AseriesB.off

r9dB rgdB(10kHz)

+6dB

network)

A

.....71d8

.37.6d8f

70dB

is

25

from

Hertz,

. . 150mV

. 150

(100H2)

position)

(10,000H2)

...97d8

(0.9pV)

(1.6pV)

(at

.'0.67o

=

4: 1,

22

mV

(21pYl

85dBf)

'O'3Yo

CaptureRatio Alternate Channel Stereo Separation

Frequency Response SpuriousResponseRatio.

lmageResponseRatio

ResponseRatio.

lF AM

SuppressionRatio SubcarrierProductRatio. Muting Threshold Antenna

AM Tuner

Sensitivity

lHF, Loop

lHF, Selectivity Signal-to-NoiseRatio

lmageResponseRatio

ResponseRatio.

lF

Antenna

Miscellaneous Power Requirements . ,

Power

Consumption

Dimensions . . . .

Weight

(without

Furnished

FMT-typeAntenna .....1

AM Loop

Operating

*Measured

Regulation rule on

*'FM

muting

unit's

The

not muted when

ara

NOTE:

Specifications and design subiect

notice,

.

Selectivity

(lkHz)

lnput

ohms balanced,

300

Section

antenna

Ext, antenna

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

package)

Parts

Antenna

Instructions

pursuant

internal wires are

to the

Povnr Output

functions with this

the sensitiviry

(400kHz)

. . 30Hz to

ohms

75

AM LooP

Watts(UL),

125

. . .

420(W)x98(Hl

. . .

Federal Trade Commission's

therefore treated

for Amplifier.

Claims

unit when the signals

measured.

is

possible

to

modification without

..2.ft8

15kHz,1!

......70d8

...45d8

....100d8

...45d8

......31d8

.27dBt

unbalanced

32OtN

.....25dB

....43d8

....40d8

...'45dB

Antenna

AC 120V,

150 VA(CSA)

x214(D) mm

X

8-7116(D)

(9lb

4.3

kg

are weak.

so

the signals

that

.

50dB

. 35dB

oa

[

(6.3PV)

lm

30pV

60Hz

in

8 oz)

1 1

Trade

2.

FRONT

PANEL

L;N

FACILITIES

-IFUNCTION

t';K

t;K

l-*'-'

L FI-EI-E

r6"

PowER

O

Push

this supplied at the turned

off at the

HEADPHoNE

@

Connect the when listening

ToNE

@

BASS

TREBLE

BALANcE coNTRoL

@

This

is normally when the right

channels The right rotatd the left toward

O

PHONO : FM : AM :

@

This connected

@

Depress

sound at a

and treble volume.

toward

the RIGHT.

FuNcrtoN

TAPE

is depresed

LOUDNESS

swtrcH

to s1^ritch on

depresed

released

plug

on

to

sound through headphones.

coNTRoLs

:

The

bass is increased clockwise from when rotated

:

The

treble is rotatd reduced

volume

channel volume is reduced

channel volume

clockwise

when rotated

kept

of

of the speakers

the

LEFT

swtrcHEs

Press

when listening

Press

when listening

Press

when listening

(ADPT)

when

to

the rear

SWITcH

this

switch to the

low level of volume.

give

and

more

and off the unit's

-

(

switch

)

(I)

position

JAcK

the

stereo headphones

when

the

center

counterclockwise.

increased when

from

the

counterclockwise.

at its center

sound delivered

or

from

is reduced

position.

headphones

the

records.

to to FM to

AM broadcasts.

SWITcH

using

a tape

panel

TAPE/ADAPTOR

position

ON

This will

life

to the sound

power.

position

(OFF).

to this

this

control

position

center

through

when the

center

when

broadcasts.

deck or

and reduced

this

position

lt is rotated

the left

differs.

position

it is rotated

adaptor unit

jacks.

when listening

enhance the

even at a low

Power

(ON)

and

jack

is rotated

control is

and

control

while

to

bass

voLUME

@

is

Use

this through The clockwise

@

This lights

tuned

@

This lights casting in

@

These will listen The A: The

B: The

No sound are both released. can be heard

and connected

@

This (FM,

The top level figures The

@

Rotate

@

the

volume

from

TUNING

in.

srEREo tNDtcAToR

stereo has

SPEAKERS

are used

to the

selected

sound is heard from

the speaker

sound

the

speaker

NOTE:

No

sund will

B switches

FREoUENcY

indicates

AM).

bottom level

TUNTNG

this

PowER

coNTRoL

to

adjust

speakers

the

or headphones.

is

increased

the

minimum

volume

when

"0"

INDIcAToR

up

to indicate

up

automatically

been

that

an

when

tuned in.

swrrcHEs

to

select the speakers

sound.

speakers are now working.

the speakers

A

terminals

heard

is

B terminals on

heard

will be

This

through the

heard

be are depressed

to

either the A

the frequency

(88

figures

KNoB

knob to

pick

tNDtcAToR/DtAL

on

the rear

from

the

when

SPEAKERS A and

position

is the

headphones.

through

or

the

if

only

B SPEAKERS

scALE

of the broadcasting

-

108) indicate

-

(55

1601 indicate

up

stations

of the

this

position.

sound

control

(TUNING)

FM,

AM

station has

(srEREo)

FM

an

speakers

rear

geakers

one et

(FM,

station broad-

through

connected

panel.

connected

panel.

which

at

when

speakerc has

of

terminals.

FM

the

AM).

potNTER

delivered

is rotated

been

you

which

to

B switches the

sound

both

the A

been

station

band.

AM band.

PARTS LOCATION

3.

Front Panel

Speaker knob AAD608

Front

oanel assemblv

ANM-292

AAD€O5

jack

Phone

AKN{45

Knob

B

(BASS,

TR EBLE,

AAB-317

View

BALANCE}

NOruSr

.

Parts uithout

o

?he

I

sofety

foctor

desEnation.

your

.

For t* ond *. ,* CENERALLY MOWS

This classificotion shall

number,

part

number connot be supplied.

morh

found

of the

Ports Stoch Control, the

temperoture, humidity, e tc.

on

some

port-

Therefore, uhen

be odjusted by

component

fost

FASTER

ports

replacing,

mouing items dre indicdted uith the morhs

THAN '. each

indicotes the impottonce of the

be sure to use

distributor becduse it depende on model

e--

parts

of identicol

Bonnet

AN E4I

Tuning AAA{84

Knob A lvoLuME)

AAB.3'I6

Function knob A

LOUDNESS)

{TAPE,

AAD6O6

Function

{PHONO,

AAD€O7

knob B

FM,

O

knob

AM)

Rear Panel View

Earth

terminal

Complex terminal AKX-073

Top View

Fuse AEK-121

Power

transformer

ATT.942

(T

1 .6A)

A

**

*

1120v)

AC socket AKP-O39

Rear

ADG-073

panel

Switch assembly

BLOCK

4.

t-

3OOO

|

BAL

FM

I

75o

|

L-UNBAL

GND

l-

AM

LooP

I

ANT

L

DIAGRAM

END

(1/3)

FRONT

FM

I

LED

D6

TUNING

DRIVER

Q6

Q4

FM

au9

sr-s

--*

':*"

STEREO

MUTE

IF AMP

LJ

(4/41

ar,

+82

FM

L

I

IFIDET

rdLF

METER

S

DETECTOR

MPX

TOR

IN

I

vco

DET.

p

OUT-

691

SlG.

L OUT

IN

AM

D4

ernv

l-

Lch REC

rroro

i-

l-enor.ro

I

Rch REC

PLAY

L

acr2ov

6OHz

FRONT

AM

trsomvl

EqUALIZER AMP

lz.smvl

a 5[,

srol

;o\--<r5

| \,, I

+q2

END

^:

-(v4l lt5omvl.

I

fT",

(3l4.,4/41

o{ll

_

qail

sr-4 TAPE

(t/21

sr-4 sr-5

(

2/2't ( 2/2

POWER

SUPPLY 8 PROTECTOR

sr-5

LOUDNESS

(2/21

|

POWER

ON/OFF

MUTING

1,"=rd;Tt--17

POWER

+82

(

13.4V

D7

TONE CONTROL vR2-2,2-3

G:405dB

AMP

s2-2

SP. B

(t/2't

lr4.

rv

PHONES

I

TO

Rch

PEAKE RS

S

1,,

,

^

I

Sl-l: FUNCTION SI.2: FUNCTION sr-3: FUt{cTroN

:

TAPE

SI.4

SI-5 : LOUDNESS

(PHONO) (FM)

(aM}

MONITOR

r"

ON - OFF

-

ON

OFF

ON - OFF

-

ON

OFF

ON - OFF

S2-I : SPEAKERS S2-2:

SPEAKERS

A I

-

ON

OFF

ON - OFF

SIOI : POWER

ON - OFF

CIRCUIT

5.

DESCRIPTIONS

FM Front End

unitized variable

A

is

unit amp,

used consisting of an

Iocal

oscillator/mixer IC

capacitor

FET

former. FM lF

2-transistor

A and the ing

the diagram of IC M51533L is IC

uses

Amp,

peak

a

Detector

and

MPX

Circuit

IF amp with ceramic stage detector

IF

has

an

and

(M51533L)

IC

MPX circuit. The block shown

detection method which can

adjusted with a single coil. The employed for

the

MPX

The IF signal is input output is obtained from put passes passes

through the signals are obtained addition,

reconstitute the

to

circuit.

at

through the muting

MPX circuit

from

this

detects the

unit

1 and the detection

5.

The detection out-

Q4,

pins

presence

front

type

end

RF single stage

and

€rn IF trans-

filter is

used

contain-

in Fig. 5-1.

This

be

PLL

method

is

38kHz sub-carrier

goes

to

9,

and the stereo

11

and

L2.

In

or absence

pilot

of

a stereo nected pin

13 indicator. and FM

FM Muting

With

when the

signal

and

mono reception

to

drops

When

IF operation

and

this

unit,

antenna antenna input drops, result, off

(Fig.

in,

the base

on

and

is

Q5

gate

the

and the

5-1).

the tuning

turned

When

potential

to

automatically

14.

When

to

the low

2 stop

LED Driver

muting is

input

decreases,

off

voltage

detector

an FM

of

indicator

by

a

stereo signal

level

to light

grounded,

is

(for

AM).

automatically

drops

below

the

and

Q6

of

output

Q4

or

AM station

is raised,

Qb

drops,

circuit is

lights.

switch between

R14 which is

is received,

the

stereo

the PLL

activated

10pV. voltage is turned

Q4

As

at

on.

is turned

blocked

is

tuned

is

turned

Q5

con-

VCO

the

3

As a

AM

t-3

s

LEVE L METER CIRCUIT

Fig.

T

5-1

INPUT

BUFFER

L OUT R OUT

FM

lF,

M5r

TER

S

EO

ITC

H

SW

Detector and MPX circuit

533 L

REGULATOR

Tuner

AM

This uses a variable circuit composed of three sistor

front end and a single transistor AM

detector. AF Section

The equalizer circuit

(2

amp

The

channel)

power

STK4141-2S

M5218P.

amp

(See

Fig.

has a low-noise

has a 25 watt output

5-a).

The tone control circuit feedback

Protective

This

unit has a circuit

power

the operates

voltage

Fig.

when

5-2

protection

loop of the

Circuits

amp

power

shows the construction

power

to detect DC

outputs and a

is

turned on and

circuit. When a DC

capacitor type

tuning

transistors, a 2-tran-

operation power

placed

is

in the negative

amp.

voltages

muting circuit

off.

of the DC

voltage

IF

IC

at

that

appears at the (plus)

the

or

Q14

polarity

applied to

fuse

the

on

power

(minus)

of the DC

D15.

This turns

primary

the

supply circuit is shut off.

Fig.

5-3 shows the Time constant diately

potential

after

of

Q15

turned on to

signal. Q15

When C161 discharged of

Q15

remains,

in the

few

A

rises to

the

passes

zero.

Q15

same

turn off

through D18; it

in an instant to

manner as when

t1

the

activate

seconds later, the base

power

However, because

is

power

is longer

power exceeds

Q16

Q15

is turned off, the

turned on and

amp output,

is activated

either

depending on

voltage and a trigger is

on

side is

cut and the

is shorted,

power

+B1

Dl5,

on/off muting circuit.

than t2

is turned

its base

and

Q17

so that

on, the emitter

potential,

and

imme-

QL5

ground

potential

along

with

Q16

and

Q17.

charge of

is almost completely

potential

make the

base

the charge of C160

muting

power

is

activated

is

turned on.

Q13

is

the

of

Fig.5-2 DC Voltage

MAI

N

VOLUME

BALANCE

VOLUME

Fig.

5-3

Power

ON/OFF muting

POWER AMP

protection

--:-----J

!

(

L

ch

circuit

Dt7 Dr6

;-:'itz

circuit

)

RtSl

- J

TO SPEAKER

swrTcHEs