Pioneer TX-520 User manual

^{æffiHf.$WË#ffiffi,

STEREO

TUNER

o This

service

manual

applicableto the KUtype.

o Whenrepairing

theYP,S

andS/G

types,

please

see

paç 25.

o Ce

manuel

d'instruction

serefère

aumode

deréglage,enfrançais.

o Este

manualdeservicio

tratadelmétodo

deajusteescritoenespafrol.

9. ELECTRICALPARTS

LIST

10.

EXPLODEDVIEW

11.

PACKING

12.ADJUSTMENTS

nÉcuce

AJUSTE

ADDITIONAL

SERVICEMANUAL

(FOR

YP,SANDS/GTYPES)

ORDER

NO.

ART-653-O

MODELTX€20 COMES

IN FIVEVERSIONS

DTSTINGUISHED

ASFOLLOWS;

Type Voltage Remarks

KU AC120V

only U.S.A.

model

YP AC240V

only Australiamodel

s/G AC110V,

12OV,22OV

and

24OY

(Switchabte) U.S,

Military model

sACI10V.120V,

22OV

and24OV

(Switchabtel Generalexport model

ss AC110V, 12OV,22OVand 240V (Switchablel Soutch Africa model

CONTENTS

SPECIFICATIONS

FRONT

PANELFACILITIES

BLOCKDIAGRAM

CIRCUIT

DESCRIPTIONS

PARTSLOCATION

DIAL

CORDSTRINGING

P.C.

BOARDSCONNECTIONDIAGRAM

SCHEMATICDIAGRAM

PICINEEFI ELEGTFICINIC CCTFIPCIFIATICIN 4-1. Mesuno 1-chome. Mesuno-ku,

Tokyo 1s3. Jêp6n

U.a. FfCINIIE| IIICTF|CINIC3 CC'FIFC,F|AIIC'N €'5 Oxf o.d Odve. Moonechre. New Je€ey O7O74, U S A

Plcrl\lllFl ILCCTFICINIC (E!,FIC,PE, N.V. Lurchagen-H6ven 9, 2O3O AnEwerp, Elelgrum

FfCrTvllF| ILICTF|CINaCa ALTaTFIALIA PTY. LTEI. 17A-1e4 Boundê.v Floêd. Eln6esrde. VicEonr6 3195. Au6b6li6 =H@

MAR.

1981

Printed

Japan

3. BLOCK DIAGRAM

tooo

AM TUNER

IF AMP A OETECTOR I

75n

GilO

(

FT,|

MPXSTEREO OEIT|oOULAIOR

Ic(HAil56wl

INOICATORS

Ftl +B +--i- V.R.

AM +B---:o I

4. CIRCUIT DESCRIPTIONS

FMTuner

The FM front end is comprised of a J-FET

(2SK168) single+tate RF amplifier, an NPN

transistor mixer, and an NPN transistor modified

Clapp local oscillator.

The IF stageconsists of 2 dualclement ceramic

filters, a single transistor amplifrer element, and an

IF system IC (PA3001-A) which incorporates

the IF limiter amplifier, FM detector, and the FM

muting circuit.

FM Multiplex Stereo

Decoder

The stereo decoder stage employs an FM MpX

IC (HA1156W-P), while the subcarrier signals

(frequencies above l9kHz) are removed by an

-18d8/oct. active filter consisting of a pNp

transistor. This active filter also sewes as an

amplifier for frequencies within its passband,

and eliminates crosstalk.

FM IF SYSTEM

(PA300r-a

)

AMTuner

This employs a 2-ganged tuning capacitor, a

dualclement ceramic filter, and an IC (HA119T)

consisting of a RF amplifier, mixer, 2-stage IF

amplifier, detector and AGC circuit.

Signal

Strength lndicator

The TX-520 signal strength meter is a b-point

LED display meter driven by the meter drive IC

(L81416). The signal meter drive signalsfrom

the FM and AM tuner sections are applied to a

set of 5 voltage comparators which are activated

according to the difference between the applied

signal level and the respective reference vottage

levels allotted to each comparator, resulting

in the LEDs(1-5) being

lighted.

METER DRIVE

(

L81416

)

Fig.

4-1 Signal

indicator

circuit

2. FRONT PANEL FACILITIES

o POWERSWITCH

When

this switchisset

to the ON position,power is

sup-

plied

to thetuner's

maincircuits.

Theunit's

power

switch

isgeared

to selecting

thetransformer's

secondary

andso

even

at theSTAND'BY

position,

theunit'scircuitry

will

work as

long

asthe

power

cord

connected

to the

power

outlet.

Disconnect

the power cord from the poweroutlet when

you do not plan

to usethe

unitfor along

period

of time'

€) FUNCTION

SWITCH

When listening

to an FM broadcast

- Setthe function

switch

to theOUT (

r )position.

When listening

to an AM broadcast

- Set the function

switch

to thedepressed

( ^ )position.

@ FM MUTING

SWITCH

Whenselecting

an FM broadcasting

station,

this switch

removes

the irritating

noise

between

stations'

lt should

normally

inthe

ONPosition.

When

thesignal

weak

andthere

a great

deal

of noise

or distortion

with thisswitch

ON,making

it difficultto

hear,then it should

be pressed

to put it in the OFF

position (in this case

mono reproduction

is obtained)'

@rurutruc

KNoB

Turn

this

to select

abroadcasting

station

(FM

or AM)'

@ otnu

scALE

This indicates

the frequencY

(FMor

AMI'

upper

number

(88

- 108)

lower

number

(55

- 160)

@ otal PoINTER

This moves

right

or left when

thetuningknobis

turned.

Line it up with the frequency

of the station

you wantto

listen

to.

O stcruel lNDlcAToR

This

indicates

thestrength

of thesignal

from the (AM

FM) broadcasting

stationto which you are presently

listening.

The larger

the numberof the lamps

lit up,the

stronger

the signal

strongsignal

indicates

that reception

conditions

areoptimum).

G) TUNEDINDICATOR

This lights

up whenan FM broadcasting

station

isbeing

received.

This lamp doesnot light up when an AM

broadcast

being

received'

@ STEREO

INDICATOR

This

lamp

lightsup automatically

when

an FM broadcast

isin stereo.

lt does

notlight

when

theFMMUTING

switch

issetto OFF.

@ FM T.TYPE

ANTENNA

This antenna permits FM broadcasts

to be heard until a

regular

FM antenna

isinstalled.

NOTE:

When the broadcasting

station is far away' or in case

of weak

signats

btockedby mountains,

it might not be possible

to receive,

FM broadcasts

with this

antenna'

ln such

a case'

pleaseinstall

anantenna

exclusivelY

for FM uæoutdoors'

of thebroadcasting

station

frequencY

ofFM

station

frequency

of AM

station

1.SPEC|FlcATloNs

FMTuner

Section

Usable

Sensitivity . . 10'8dBf

(1.9r..V)

5(HBQuietingSensitivitY

MONO ..17.3dBf(4.0sV)

STEBEO 39.2dBf

(50svl

Signal-to-Noise

Ratio

(at

65dBf)

MoNo " " 75d8

STEBEO ....70dB

Dislortion

(at

65dBf)

MONO .-'.1kHz;0.1o/o

STEREO ....1kH2;O.2o/o

Capture

Ratio . ldB

AlternateGhannel

Selectivity

(400kHz) .60d8

Stereo Separation

lkHz. .....40d8

Selestivity .....25d8

Signal

to Noise

Ratio . . .50d8

lmageResponse

Ratio . . .40d8

lFResponseRatio. ...70dB

Antenna ,.. Ferriteloopstickantenna

Audio Section

Output (

Level/lmpedance) 650mV/3.6kO

(100%

MOD)

AM (30%

MOD) lSOmV

Frequency

Besponse

. .

Spurious

Response

Batio .30Hz

totstnzlo'f

Miscellaneous

PowerRequirements .... AC120V,50/60H2

PowerConsumption ....llw

Dimensions ... 420(W)x

94(H)x254(D)mm

16-9/16(W)x 3-11116(H)

x 10(D)in

Weight

(Without

Package)

FurnishedParts 3.2k9

(6lb

13oz)

FM T-type

antenna

Operating

Instructions

NOTE:

Specifications and the design subiect to possiblemodifica-

tion without notice due to improvements.

lmageResponseRatio ...55d8

ResponseRatio.. ...80d8

AM Suppression

Ratio . .55dB

MutingThreshold ...19.2d8f (5pV)

Antenna

lnput . . 3(X)ohmsbalanced,

75ohms

unbalanced

AM Tuner

Section

Sensitivity

IHF ferriteantenna 300frV/m

lHFexternalantenna. .....30pV

()( T.tl,T

:?1,

iil-L+;l

iQr4 Qt2 QTQO 09 ,

HAl156W.P

T4 T2 1C4 VCITCi vRl

TC5VC3

\Æ2 rc2

,:* '" I]'Ki

[&ti,,,'

., .;

'- -1.r H l-a

9iç+d

ti R?6

3.46X

1? r

,.:F?ll4l(

)

-l

*3-rrr--

Ll "t'*

# **=

ffi ffi* Ëâ ffi

@ ffi fÈ, t'",,"

'cà ,,,1

"r€]",|Ê;f:Ë

r , Y#lu,T --i-- *Rfi,.-,,",^"

::l'i [:'na4pu- 33/50

''fJ.,fti Tc ] ' ,,1Ëlfff

ibJi ffi #

i '_b€lf,r".;,ld;

ff;* #

Èf - | | Jù*;";;;','J_hË;EE ili;

@ 's'T-ffi,'"':io

i i :t':"f-'il.;{îfl,ryF

#l , '!{:,,,,

PA3001-A

HAl 197 2SA726S

2s'c2575

7. P.C.BOARDS

CONNECTION

DIAGRAM

ATUNER Ass'y(cWt- | SZ)

Q4 Q5 02 Q3

ExternalAppearance

of Transistors

and lCs

2sKt6B 2sc461

2Sc53s

i "____,f--* i 0iz aEe j:

ï'ffiLJffi

ll -,.",,.$j.'ilgji'

ffiÆiffi#':,.,ï*fu ri.,-

r;___-t I i I e ,,:7- 16i,o0K

at2 zsc461 ll , .--_ fir:T

. "..^'lffil.jfl"TE* ffi-g *tq"- + L+=j-s-

*4*l-.=*=*-#i,lo-.,:...-.,1.rcai**.{fi|.-,:*.-Æ

DIAL POINTER SWITCH Ass'Y

(cws-346)

LED Ass'y (GwX-634)

zscxt45A

Tl:POWER TRANSFORMER

r------\ Rtoo 2 2M.(t/2w)

LBl4t6

PL2

aV I OOmA

PLI

AVO3A

AC | 20V

5. PARTS LOCATION

Front

Panel

View

Front panel

assemblY

ANM-005 r

Rear

Panel

View

Strain relief

AEG76O

Terminal

(ANTEN

AKA.O14

TopView

Dial pointer assembly

AAF-I11

* * LamP with wires

AEL-l55

A * Power

transformer

ATT-790

A i* Pushswitch

(POWER)

ASG-s16

** l€mp

AEL-108

Switch

NOTES:

CTheAmarhfound'onsomecomponentpartsindicatestheimportanceofthe

safetyfactoroftnepart'Therefore,whenreplacing,besuretotnepartsofidentical

designntion.

oForyourPartsstochControl,thefætmovingitemsareindicatedwiththe

marhs ** and *

i7 cawsnALLY MovES FASTER

THAN *

This

clasification

snitt-UeTdiueted

byeach

distibutorbecarse

it depende

onmodel

number,

temperature,

humidity,

etc'

base

AEC-741

KNOb

(TUNING}

AAA.O71

Knob

(FUNCTION,

MUTING}

AAD.268

Terminal

(AM

STEREOOUTI

AKB-O76

Strain reliel

AEC-327

ACpower

cord

ADG.Os2

ADE.O34

Tuning

shaft

assembly

AXA-292

* * Push

switch

(FUNCTION,

MUTING)

ASG-261

LED assembly

cwx-638

Top

GWs346

Dial

Pointer

6. DIAL CORD

STRINGING

1. Removethe top cover and front panel'

2. Remove the tuning drum from the shaft of the

tuning caPacitor'

3. fie one end ot it'e cord to the stud A located

inside the tuning drum'

4. Rotate tfte tuinË-capacitor right,around until

-' ifr" ,otot bladesa"" tutty intermeshed'

6;;;" thetunintdnrm

back:"IÎ,tÏ t^TT::

"' Jupu"itot shaft, Àaking sure-

that the secunng

t"i"* B facesdirectlY uPwar-d'

6. Pass

the cord o"i Utt""gtt the small opening in

the circumt"'""àt of lrre tuning drum (see

diagram), ""a tf'"tt take it over pulleys C' D

and E in that sequence'

z. friiJtrt" "o'a Jtà"ttd thetuningshaft 3 times'

8.Pass

it over

p"ff"V f' *ii.d il."t9lÎd thetuning

drum 2 times, iiJ littutty tie it to the spring

ttà.t C so

that it istensioned'

9. Tum the tuning shaft, and check that the cord

movessmoothly.

10. Cut off any excess

eord'

ii. T;-ù; tuning shaft counter'clockwise

asfar as

it will go'

12. Alig the dial p"i"t"" wrth the starting point

--' ;; A" dial scaie, and then passthe cord over

it.

13. Check that t'tre diat pointer is in line with the

- - starting point of the dial scale'

14. Finally appty ttr" locking paint to the cord

securing positions (stud A and spring hook G)

and the dial Pointer connecuon'

9. ELECTRICAL

PARTS LIST

NOlES;

o llhen ord,ering resisfors, first convert resistance ualuecinto code form asshown in

the following examples.

Ex. 1 Wen there are 2 effectiue digits (any digit apart from O),such æ 56O ohm

and 47h ohm (tolerance is shown by J=5%, and K=lO% ).

56Oa 56 x lol

57ka 47 x 103 561

. .. .. RD%PS

E[tE J

473.,.., RD%PS

EAAB

o.sa 0R5.. .... RN2H

@rE6 K

rsl 010

.. .... æsrP

@a@

Ex. 2 Wen there are 3 effectiue d,igits (tuch as in high precision metal film

resistots),

5.62ha 562x 10' 562r . .. . RN%SR

@6@ln

c The I mark found, on some component parts indicates the importance of the

safety factor of the part. Therefore, when replacing, be sure to use parts of

ide

ntical desi gnati

on.

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

marhs ** and * .

** GENERALLY MOVES FASTER THAN *

This classification shall be adjwted by each distibutor because it depends on

model number, temperature, humidity, etc.

Miscellaneous

Parts

Mark Part No, Symbol & Description Part No. Symbol & Description

A * ATT-790

*i AEL-108

** AEL-I55

a ACN{29

ADG452

ADE-O34

GWE-l

GWS-346

GWX-638

AKB076

Tuner

Assembly

(GWE-I

52)

CAPACITORS

Mark Part No.

T1 Power transformer

PLI Lamp assembly

PLz Lamp with wires

R100 Carboncomposition

resistor (2.2M1%Vll

AC power cord

Output cords with phono plugs

Tuner assembly

Switch assembly

LED assembly

Terminal

(AM STEREO OUTI

Symbol & Description

c37,C39

c30,c:]1

g2,c5, cl 1, C13,eA7,C52.

CU,

c56,C69

cl4, Cl5,C17,

C18,C20,C22,

C23,

c26,C29,C49,C50,C71

c24

c51,C57,C68

c58

æ2

c33

c34

c16,æ5,U3,U4

c27,C60,e,61

c19

u6,62

c25

c55

c63

c28

cæ

cæ,67

c65

c36,C70

CKDYB

222K50

CKDYX273M25

CKDYF

1032

CKDYF4732

CKDYX473M

CKDYF223250

cosA 331K 50

cosA 511J

CEA

R33M

50L

CEA

OlOMsOL

CEA

R47M

50L

CEA

OlOM

50L

CEA

2R2M

50L

CEA

lOOM

50L

CEA4TOM

1OL

CEA4R7M

35L

CEA

101M

25L

CEA221

M16L

CEA221M25L

CEA

471M

16L

CEA

471

M25L

CEA3R3M

50L

CEA

1O1M

16L

ACK-OI2

ACM-006

ccDUJ

O90D50

CGB

R47K

5OO

ccDzM 050Ds0

ccDSL 060D50

ccDcH 080D50

ccDcH 1

50J

ccDRH 150J

ccDUJ 150JsO

ccDcH 330Js0

ccDsl 101J

Tuning capacitor

Ceramictrimmer

TCXI

c10

c59

c12

ccDsL 221J50 c21

CKDYB561K

50 C38,C40

CKDYB

102K

50 C53

CKDYB122K

û U8

CKDYB182K

50 CA1

,CA2

-11

(

rr AcPo7g

RD%PM

trBtrJ

RNz4PO

trODDF

SEMICONDUCTORS

Mark Pan No.

VRI Semifixed

(5k-B)

Rl-R4, R6-R25, R27-R34,

R36-R67, R74-R78, R80-R87

R26,R35

RESISTORS

NOTE:When ordering resisfons,

conuert the resistance

value

into codeform, and thenrewrite the portno. as

before.

Mark Pan No. Symbol & D6cription

OTHERS

Mark PartNo. Symbol& Dercription

* * ASG-261 Push

switch

(FUNCTION,FM

MUTING)

AKA-O14 Terminal4-p (ANTENNAI

PMZ3OPOGOFMC Screw3X 6

VBZ3OP100FZK Screw3

X 1O

SwitchAssembly

(GWS-346)

Mark PartNo. Symbol& Dcc.iption

A ** 496€,15 Push

switch

(POWERI

LEDAssembly

(GWX-638)

NOTE:When ordeing resrstors, conuert the resistance ualue

into code form, and then rewite the part no. as before.

Mark PartNo. Symbol& Dæcription

Symbol & D$cription

** 2SK168

** 2SC535

** 2SC461

** PA3001-A

** HAt156Wf

** 25A7265

** (2SA7501

** HAl197

A ** zsoego

A ** (zsogrs,

** L81416

** 2SC945A

** (2SC257st

* 1082

r (srB0102l

* KZL130

* 152076

* (1S15551

* 1152473''

COILS,

FILTERS

Mark Part ltlo.

03,o4,o12

07,o8

010

013

011,O14

,o2

D13,Dl4

RDy.PM

trtrtrJ

* AEL-337

* AEL334

R68-R73

D4-D9 LED(Greenl

D10 LED

(Red)

Symbol& Dæcrlption

ATEO49

AT8.()66

ATEOOS

124428

AT8623

ATFO53

ATF-I21

ATFO38

T2 FM

det.

transformer

T3 AMosc.coil

T4 FM lF transformer

L6 RF

chokecoil

L7 Bar-antenna

assembly

Fl ,F2 FM

ceramic

filter

F3 AMceramic

filter

F4 AM lFfilter

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