Sony ST-JX4L Bedienungsanleitung

AEP Model

UK Model

$TtnE0/Fn||-A]r{

TlJ

rwl

IQUARTZI

N,[fi

Frequency

response

40Hz

- 12.5kH'z

+0.2

- 15

kHz

1oà2

Selectivity 80dBat300kHz

Captureratio 1.0dB

suppressionratio

60dB

lmage

responseratio

80dB

lFresponse

ratio 10OdB

Spuriousresponse

ratio

100

- Continued on page 2 -

ATTENTION AU COMPOSANTAYANT RAPPORT

Àu sÉcunrrÉr

LES COMPOSANTSIDENTIFIES PAR UNE TRAME ÊT

urue ruenoue I suR LEs DTAGRAMMEs

scxÉ-

MATrouEs,

LEsvuEs ÉclerÉes ET LA Ltsrg DEs

prÉces

soNT cRrrrouEs

pouR le sÉcuntrÉ oe

FONCTIONNEMENT. NE REMPLACER CES COMPO-

sANTsouE pARoes prÈces

soNy DoNT LEsNU-

nnÉnos

sorur ooruruÉs

DANscE MANUEL

ou DANS

les suppt-ÉueNrs

puelrÉspAR

soNy.

SONY

FM tuner section

Tuningrange 87.5

MHz

- 108MHz

Antennaterminals 300ohms,balanced

ohms,unbalanced

Intermediate

frequency

10.7MHz

Sensitivity

at 46dB quieting

(40

kHz

deviation)

sV (mono)

43gV(30pV)i (stereo)

Usable

sensitivity 1.4FV

(S/N

= 26dB,40kHz

deviation)

1.8

sV,

10.3dBf

(lHF)

Limiting

threshold 'l

Signal-to-noise

ratio(40

kHzdeviation)

80dB (mono),

75dB (stereo)

Harmonicdistortion

(40

kHzdeviation)

0.08%

(mono)

,0.12o/o

(stereo)

at '100

0.08%

(mono),

0.12o/o

(stereo)

at 1

kHz

0.1%(mono),

0.2%(stereo)

at 10kHz

lM clistortion

(40

kHzdeviation)

SPECIFICATIONS

0.08% (monol, O.12% (stereo)

45 dB at 100 Hz

50dB (17d8)* at 1kHz

40 dB at 10kHz

SAFETY.RELATED COMPONÊNTWARNING!

COMPONENTS

IDENTIFIEDBY SHADING AND MARK

A oN THE scHEMATrc DTAGRAMS, EXpLoDED

VIEWSAND IN THE PARTS LIST ARE CRITTCAL

SAFE OPERATION. REPLACE THESE COMPONENTS

WITH SONY PARTS WHOSE

PART NUMBERS APPEAR

AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS

PUBLISHEDBY SONY.

Seoaration

SERVICE

MANUAL

sT-JX4L

intermodulation

74dB

(lHF),

88dB

(2.4

MHz)

Sub-carrier

product

ratio

Muting

threshold Approx.

25.2dBl,

Output

level/impedance

(75

kHzdeviation)

750

mV,4.7k ohms

Calibrating

tone

level

' 50%

modulation

(37.5

kHz

deviation),

400Hz

( )* measuredwith

theSENSswitchengaged

MW/LW

tunersection

Ferriterod antenna

External

antenna

terminal

54(50)' dB/m

(at 230kHz)

50(40)t sV

(at 230 kHz)

45dB(9

kHz)

75dB (at230

kHz)

( )r measurèd with the SENS switch engagod

46(42)* dB/m

(at999

kHz)

(30)*

(at

999

kHz)

45dB (at999kHz)

General

System

Power

requirements

Powerconsumption

Dimensions

Weight

PLL

quartz-locked

digital

synthesizer

system

UKmodef : 24OV ac-lor22OY ac-adjust-

ableby authorized

Sony personnel),

50/60 Hz

AEP modef: 22OY ac- lor 24OY ac

- adlust-

ableby authorized

Sony personnel),

50/60 Hz

12W

Approx.

430

x 55

x 330

(w/h/d)

(17

x 2rlt

x 13inches)

including

projecting

parts

andcontrols

Approx.3.6

lbs

oz)

net

Approx.

4.1

lbs

oz)

inshipping

carfon

MODEL

lDENTIFICATION

- Specification

Label-

AEPmodel MODELNO.

ST. JX4L

FMSTEREO/FM.AM

TUNER

FREQUINCY

RANGE'

FM875-l08MHzMW522-1602kHz

LWl55-344kHz

lF :

l0.7MHzAM450kHz

AC:22QV

- 50/60H2 tzW

FTZ-PRÙFNUMMER

U185

SERIAL

NO.

MADE

IN JAPAN 4-875-305-OI

OUK model

MODEL

NO.

ST-JX4L

FMSTEREO/FM-AMTUNER

FREQUENCYRANGE:

FM87.5-l08MHz

MW522-l602kHz

155

344

kHz

:FM

l0.7MHz

AM450kHz

50/60H2 tzW

AC:240V-

SERIAL

NO,

MADE

JAPAN 4-875-306-0I

ST.JX4L

. THE CERAMIC CAPACITORS

This set uses tube-type ceramic capacitors whose

shape is identical with the carbon resistors. Be careful

not to use resistorsinstead of capacitorsin repairing'

Disc-type ceramic capacitors can be used for

replacing those originally used in the set.

Two kinds of drilled holes are provided in some

patterns for mounting the tube-type and disc-type

ceramic capacitors. Use appropriate holes where

applicable.

Silvering on inside

of tube forming

second electrode.

SERVICING

NOTES

Example:

ceramtc

st digit temperature

characteilstic

tolerance

yellow

;

47 l0'15%

wh.ite

SL ) 47OpF +5% SL

Silvering deposited on outside

of tube forming one electrode.

multiplier

2nd digit

COLOR

CODE(in PFI

Color lst or 2nd

Digit Multipliet Tolerance Temperatur€

charac-

teristac

brown Il0' Y

red 21o'? D

orange J103

yellow 410" RH

gleen 5

blue 6

violel 7UJ

Elay 8x30Vo x

white 9SL

black 0100 t207o CH

eold l0-t t5% V

silver t0-? xlÙVo B

ST-JX4L

o Handling

Precautions

for MOSlCs

Generally, the insulation resistance

of the oxide

layer in MOS IC structures

isveryhigh,

and the oxide

layer is very thin. Because

of this, it is possible

that

the static voltages

usually present

on clothesand the

human body will be enough to generate

a potential

difference across

the insulator, high enough to cause

a breakdown of the insulating

layer.

The following precautions

should be takenwhile

handlingthese

ICs.

(Particular care

should

be taken under conditions

of low humidity.)

Precautions

in ReplacingMOS lCs

Store

newICsby inserting

them into aurethane-

polyester cushion (which is somewhat conduc-

tlve), or wrapping it in aluminum foil, so that

all the pins areat the same

potential.

(The ICs shouldbe stored in that manner

until

mounted on the circuit board.)

Fis. Apartially conductive

unrethane-polyeste r

cushion

Fis. Baluminum foil

Equalize

any potential

difference

between

the

clothes,

the tools in use,

the work bench,

the

set being

worked on, and the packaged

IC by

touching them all in succession

with the hancis

or a conductive

wireor tool.

The following are effective methods for handl-

ing ICs that remove the potential difference

across

the oxide layer.

. Use a paper clip nrodified by solderingin a

wire braid

insert.

soldered

Fig. D

Fis. E

soldered

Make sure that there is

no solder on the inside

clip

Check the soldering

iron for possible

power-line

leakagecurrent. Make sure that there is no

leakage

path

by con4ecting

anohmmeter

to the

tip of the soldering

iron and the plug

shown

in Fig.

C. If there is a leakage

path, use

some

other solderins

iron.

VOM

(dl x IO,OOO range)

Make sure that all the oins are in

contact with the wire braid latt

_ the pins will then be at the same

f tg. f potentiat.).

partially conductive

urethane-polyeste r

cushion or aluminum

foil

wire braid

Fis.

OTake a short length of fine bare wire and

wind it around the IC sothat it shorts all the

pins of the IC, while it is still in the urethane-

polyester cushion or aluminum foil. This

ensures that all the pins are at the same

potential.

fine bare wire

(stripped solid hookup

wtre, etc.J

Precaution

while Checking C-MOS lCs

The C-MOSICs (Complementary MOS) areMOS

ICs that have their output sections made up of

N-channeland P-channel

push-pullstagesto increase

their speedof operation. If the output terminal of

these ICs comesinto contact with B+ or B- voltage,

then the FET which is ON at that time will either

becomeshorted or open.

This is valid for all the output sectionsthat are

connected together by the interconnections. Even

the circuits that are physically separated

(and not on

the same board) can be destroyed simultaneously.

Example:

partially conductive

urethane-polyester

cushion or aluminum

foil

Fis.G

o When it is necessary

to handle the IC with

the fingers,do not touch any pin, and hold

the IC at the endsof its plastic-package

case

asshown in Fig.H-

Fis. H

Method of Mounting

Insert the IC while holding it with the modified

clip, and solder all the pins with the clip still

shortingthe pins. (Similarly, solderall the pins

while the bare shorting wire is still wound

around them.). Remove the clip or the bare

shorting wire only after all the pins havebeen

soldered.

lf this line is grounded, or touches

B+ or B- bus. . . , the output stage

of this lC will be destroyed.

Fis. I

SECTION

OUTLINE

1-1. CONTROLLER

1C503

(1rPD553C-1371:

llO (lnput/Output)PORT'SFUNCTION

Port PinNo.of lC Function

PA2

PA3

PBO-3

PCo-3

PDO-3

PFO-3

PGO-l

PG2

PG3

PEO

PEI

PE2

PE3

PHO-3

Pto-2

37-40

2- 5

8-11

t6-19

22-23

26-29

30-32

FM Muting ON/OFF Signal.

Memory IC Data Input

Level is alwaysH at AM mode.

Seenext page.

FM/AM Control Output (FM: I, AM: 0)

MWLW Control Output (MW: I, LW: 0)

Clock Output for PLL/MEMORY IC

$ee

next page.

PLL Latch Output

DataOutput for PLL MEMORY IC

Address Output for Memory IC

Mode Control Output for Memory IC

5T-JX4L

O SWITCH

AND DISPLAY

MATRIX

10.7MHz I 50kHz

When identitication color

of ceramic filter is blôck or

white, this diode is used.

LW changeover

OFF

Lw, (153-342

kHz)

ON LW,

(155-344

kHz)

kHz

19.6ttt.,

Switching

Matrix

When identiTication

colol

ol ceramic filter isblack

this diode isused

CAL TONE CONTROL

SENSCONTROL

'MUTING

CONTROL

ENFORCEDCONTROL

ST.JX4L

1-2. BLOCK

DIAGRAM

LEIEr

L-El---l

Ëtr

l,'l

oF<

aÈ

Èt

t:i

frf,

* ==r

1.3. TUNING WITH THE STATION PRESET

BUTTONS

With this tuner, owing to an electronic tuning

system using a PLL (Phase

Locked Loop) synthesizer

and a memory circuit, the reception of a station is

much simplified. Once you commit the frequencies to

memory, pushing

a button isall you need

do to select

a desired station. There is no need to search for the

station with the TUNING button each

time you wish

to tune in a station.

TO MEMORIZE THE STATION FREOUENCIES

Preparation: A total of eight station preset but-

tons can be preset for either FM, MW or LW in any

desired sequence. Arrange the order of stations for

each station preset button and note the band and the

frequencyof each

in advance.

Repeat

these

stepsfor each

stationpreset

button.

Replace the station labels to conform to the

selected

prememorized

stations.

Notes:

o The MEMORY indicator will go off automatically

after a few seconds.When the indicator is out, the

memory circuit does not operate to memorize the

station.

a The previous memory will be erased when a new

frequency is committed to the memory of the same

button. An erasure

cannot be made without a new

input.

To memorize

a weak station

To memorize MW and LW stations whose signals

are weak or whose strength is variable, tune with the

SENS switch engaged.

To memorize weak FM sta-

tions, tune with the SENS switch engagedand the

ff|f,'r$l switch disengaged. This will ensurethe

onetouch memory reception of those stations.

Follow the numbered seguence.

TO CHECK THE PRESET FREOUENCY

After the memory procedure

is completed, con-

firm the prememorized frequency. Press

the TUNING

button and changethe frequency display indication.

Press the station preset button to be checked. The

frequency which had been pre-memorized should

then be indicated in the band/frequency-display win-

dow.

TO RECEIVE A PRE{VIEMORIZED

STATION

Turn the POWER switch on and simply press

the

desired

stationpreset

button.

Memory of the last received

station

This tuner includes a memory circuit to re-

member the station which had been received for

more than one second just before the power was

turned off. This station will be automaticallv

tuned in when the power is turned on again.

This memory system enables you to make a

timer-activated recording from the tuner.

Note that the setting of

the f^lôi,Î,Zt

and SENS

switches for reception

of this station is mem-

orized. llluminates for a few seconds,

@ WOit" theMEMORy indicator is iiluminated,

pressthe desired station preset button.

The indicator will go out, and the band,

frequency and setting of the rlaLj!,È^,z,

and

SENS switches will be memorized.

ST.JX4L

Note: Follow the disassembly

procedure

in the numericalorder

given.

Top

Coverand

Front

Panel

Removal

o O, O: top

cover

o O-@: frontpanel OevTT3x6

pBVTT

,P 3x6

EVTT

,P 3x6

y'-

l-..o.XU'y'j

front panel

avrrsxo

SECTION

DISASSEM

BLY

Bottom Plate Removal

(l): Loosen

the eightscrews

(BVTT 3

x 6).

(2): Remove

in the

direction of

arrow.

'og

not loose these screws.

10 -

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