Sony ST-JX44L User manual

MICROFILM

SPECIFICATIONS

FM

tuner

section

Tuning

range

Antenna

terminals

87.5

MHz

-

108

MHz

300

ohms,

balanced

75

ohms,

unbalanced

Intermediate

frequency

10.7

MHz

(at

40

kHz

deviation)

at

46

dB

quieting

17.3

dBf,

4

pV

(mono)

Sensitivity

38.3

dBf,

45

pV

(stereo)

10.3

dBf,

1.8

uV

(IHF)

1.6

pV

(S/N

=

26

dB)

Usable

sensitivity

76

dB

(mono)

71

dB

(stereo)

Signal-to-noise

ratio

Harmonic

distortion

at

1

kHz

0.08%

(mono)

0.15%

(stereo)

IM

distortion

0.08%

(mono)

0.15%

(stereo)

Separation

at

1

kHz

50

dB

40

Hz

—

12.5

kHz

+0.5

dB

30

Hz

-

15

kHz

+95

dB

Frequency

response

SAFETY-RELATED

COMPONENT

WARNING!!

COMPONENTS

IDENTIFIED

BY

SHADING

AND

MARK

A

ON

THE

SCHEMATIC

DIAGRAMS,

EXPLODED

VIEWS

AND

IN

THE

PARTS

LIST

ARE

CRITICAL

TO

SAFE

OPERATION.

REPLACE

THESE

COMPONENTS

WITH

SONY

PARTS

WHOSE

PART

NUMBERS

APPEAR

AS

SHOWN

IN

THIS

MANUAL

OR

IN

SUPPLEMENTS

PUBLISHED

BY

SONY.

Selectivity

Capture

ratio

AM

suppression

ratio

at

300

kHz

80

dB

60

dB

Image

response

ratio

50

dB

IF

response

ratio

90

dB

Spurious

response

ratio

|

70

dB

RF

intermodulation

60

dB

(IHF)

Muting

threshold

approx.

25.2

dBf,

10

pV

Output

level/

impedance

at

75

kHz

deviation

750

mV,

4.7

k

ohms

—

Continued

on

page

2

—

ATTENTION

AU

COMPOSANT

AYANT

RAPPORT

ALA

SECURITE!

LES

COMPOSANTS

IDENTIFIES

PAR

UNE

TRAME

ET

UNE

MARQUE

/\

SUR

LES

DIAGRAMMES

SCHE-

MATIQUES,

LES

VUES

EXPLOSEES

ET

LA

LISTE

DES

PIECES

SONT

CRITIQUES

POUR

LA

SECURITE

DE

FONCTIONNEMENT.

NE

REMPLACER

CES

COMPOSANTS

QUE

PAR

DES

PIECES

SONY

DONT

LES

NUMEROS

SONT

DONNES

DANS

CE

MANUEL

OU

DANS

LES

SUPPLEMENTS

PUBLIES

PAR

SONY.

®)

SERVICE

MANUAL

ST-JX44L

MWILW

tuner

section

MW

LW

Tuning

range

§22

kHz

—

1,602

kHz

153

KHz

-

344

kHz

ferrite-bar

provided provided

antenna

Antenna

external

antenna

provided

terminal

Intermediate

450

kHz

450

kHz

frequency

ferrite-bar

200

pV/im

500

pV/m

Usable

antenna

(at

1,000

kHz)

(at

230

kHz)

Seren

uIty

external

30

uV

50

pV

antenna

(at

1,000

kHz)

(at

230

kHz)

Signal-to-noise

ratio

55

dB

55

dB

Harmonic

distortion

0.3%

ao

35

dB

35

dB

Selectivity

(@

kHz)

Q

kHz)

Image

response

ratio

45

dB

45

dB

(at

999

kHz)

(at

230

kHz)

General

System

PLL

quartz-locked

digital

synthesizer

system

System

FM

stereo,

FM/AM

superheterodyne

tuner

Power

requirements

AEP

model:

220

V

ac

(or

240

V

ac

adjustable

by

authorized

Sony

personnel),

50/60

Hz

UK

model:

240

V

ac

(or

220

V

ac

adjustable

by

authorized

Sony

personnel),

50/60

Hz

Memory

back-up

power:

3

V

dc,

two

bat-

teries,

IEC

designation

R6

(size

AA)

Battery

life:

approx.

1

year with

Sony

SUM-3(NS)

New

Super

Batteries

Power

consumption

8

watts

Dimensions

Approx.

430

x

55

x

300

mm

(w/h/d)

(17

x

2!/4

x

117/s

inches)

including

projecting

parts

and

controls

Weight

Approx.

2.9

kg

(6

Ibs

7

oz)

net

Approx.

3.4

kg

(7

Ibs

8

oz)

in

shipping

carton

MODEL

IDENTIFICATION

—

Specification

Label

—

SONY

FM

STEREO/FM-AM

TUNER

FREQUENCY

RANGE

:

FM87.5

—1O8MHz

LW

153-344kHz

==MW522—1602kHz

50/60Hz

=

MODEL

NO

ST—JUX44L

IF

[FMIO.7MHz

AM450kHz

-

Ae

tg

e

8W

1

SERIAL

_NO,

FEATURES

The

quartz-locked

digital

frequency-synthesizer

system

allows

ac-

curate

and

stabie

tuning

that

is

not

affected

by

temperature

varia-

tions

or

long

period

usage.

Quick

and

accurate

station

selection

is

possible

with

an

electronic

digital

readout

on

the

frequency

display

window.

Tuning

can

be

done

either

by

changing

frequency

display

reading

rapidly,

or

step

by

step.

The

MEMORY

SCAN

button

allows

you

to

scan

automatically

the

preset

stations

only,

listening

to

each

one

for

a

few

seconds

to

check

if

there

is

anything

you

would

like

to

listen

to.

FM

muting

circuit

is

incorporated

to

eliminate

any

interstation

noise.

The

setting

of

the

S{ERE°

switch

can

also

be

memorized

for

each

station,

and

permits

one-touch

reception

with

a

suitable

mode/FM

muting

setting.

A

beat-cut

filter

for

eliminating

114

kHz

beats

is

provided

prior

to

the

multiplex

circuit

to

assure

better

FM

stereo

reception.

Circuit

highlights

Excellent

reception

characteristics

are

assured

by

employing

carefully

selected

parts:

a

MOS

FET

in

the

RF

amp.

for

high

sen-

sitivity

and

excellent

spurious

response

ratio,

three

uni-phase

filters

and

an

IC

in

the

IF

amplifier

for

high

selectivity,

and

a

phase-

locked

loop

IC

for

excellent

separation

and

low-distortion

characteristics.

The

memory

contents

are

retained

by

two

memory

back-up

bat:

teries

when

the

power

is

turned

off.

These

memory

back-up

bat-

teries

also

aliow

the

last

station

tuned

in

to

be

held

in

the

memory.

With

the

RM-44

system

remote

controller,

you

can

remotely

control

power

on/off

and

prememorized

station

selection.

AEP

model:

220V

~

UK

model:

240V

~

AEP-W.

Germany

model:

ST-JX44L

SERVICING

NOTES

@

THE

CERAMIC

CAPACITORS

|

This

set

uses

tube-type

ceramic

capacitors

whose

shape

is

identical

with

the

carbon

resistors.

Be

careful

not

to

use

resistors

instead

of

capacitors

in

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

formin

envelope{

green

second

electrode.

AUAVUVRALBEVanerene

ss

nS

ay

\

ANRRTED

Ven

vewnnnn.

|

1D,

Silvering

deposited

on

outside

of

tube

forming

one

electrode.

COLOR

CODE

(in

pF)

Temperature

Tolerance

charac-

teristic

Ist

or

2nd

olor

Digit

Peown

|

a

ef Cd

are

ae

a

RH

orange

SIO]

Ol

AINA]

Nn!

lw]

wp

10!

103

10°

|

ue

10°

silver

107?

multiplier

temperature

characteristic

tolerance

2nd

digit

7K

yellow

violet

:

gold

white

7

10'°+5%

SL

@®

470pF

+5%

SL

ST-JX44L

®

Circuit

Connections

Depending

on

the

Ceramic

Filter

(CF101

~

103)

This

set

employs

five

types

of

ceramic

filter

which

have

different

center

frequency.

The

pattern

connec-

tions

will

be

different

to

match

the

center

frequency

with

the

intermediate

frequency.

That

is,

the

pattern

connections

will

be

different

depending

on

the

color

mark

on

the

ceramic

filter.

color

mark

AN

Jumper

wire

connection

(e)

xX

x

[e)

x

10)

Xx

[@)

x

O

:

connected

FM

intermediate

frequency

(MHz)

X

:

not

connected

FM

intermediate

frequency

is

determined

by

five

types

as

shown

above

with

specifing

the

state

at

terminal

24,

25

and

26

of

IC402

by

Jumper

wire

connection.

*

CF101,

102

and

103

should

be

used

the

ceramic

filters

of

same

center

frequency.

*Jumper

wires

(J1-J3)

are

located

in

the

section

“FE-4”

of

the

mounting

diagram

on

page

21

or

29.

ST-JX44L

@

Handling

Precautions

for

MOS

ICs

(1C402:

TCP4621BP,

1C601:

LC4001B,

1C701:

»

PD4011BC)

Generally,

the

insulation

resistance

of

the

oxide

layer

in

MOS

IC

structures

is

very

high,

and

the

oxide

layer

is

very

thin.

Because

of

this,

it

is

possible

that

the

static

voltages

usually

present

on

clothes

and

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

taken

while

handling

these

ICs.

(Particular

care

should

be

taken

under

conditions

of

low

humidity.)

Precautions

in

Replacing

MOS

ICs

1.

Store

new

ICs

by

inserting

them

into

a

urethane-

polyester

cushion

(which

is

somewhat

conduc-

tive),

or

wrapping

it

in

aluminum

foil,

so

that

all

the

pins

are

at

the

same

potential.

(The

ICs

should

be

stored

in

that

manner

until

mounted

on

the

circuit

board.)

Fig.

A

partially

conductive

unrethane-polyester

cushion

Ic

Fig.

B

aluminum

foil

2.

Check

the

soldering

iron

for

possible

power-line

leakage

current.

Make

sure

that

there

is

no

leakage

path

by

connecting

an

ohmmeter

to

the

tip

of

the

soldering

iron

and

the

plug

as

shown

in

Fig.

C.

If

there

is

a

leakage

path,

use

some

other

soldering

iron.

VOM

(Q

x

10,000

range)

3.

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

ail

in

succession

with

the

hands

or

a

conductive

wire

or

tool.

4.

The

following

are

effective

methods

for

handl-

ing

ICs

that

remove

the

potential

difference

across

the

oxide

layer.

@

Use

a

paper

clip

modified

by

soldering

in

a

wire

braid

insert.

wire

braid

soldered

.

Make

sure

that

there

is

Fig.

D

no

solder

on

the

inside.

clip

partially

conductive

£

urethane-polyester

Fig.

E

queen

or

aluminum

oll

wire

braid

clip

Make

sure

that

all

the

pins

are

in

contact

with

the

wire

braid

(all

;

the

pins

will

then

be

at

the

same

Fig.

F

__

potential.).

ST-JX44L

®

Take

a

short

length

of

fine

bare

wire

and

Precaution

while

Checking

C-MOS

ICs

wind

it

around

the

IC

so

that

it

shorts

alli

the

pins

of

the

IC,

while

it

is

still

in

the

urethane-

The

C-MOS

ICs

(Complementary

MOS)

are

MOS

polyester

cushion

or

aluminum

foil.

This

ICs

that

have

their

output

sections

made

up

of

ensures

that

all

the

pins

are

at

the

same

N-channel

and

P-channel

push-pull

stages

to

increase

their

speed

of

operation.

If

the

output

terminal

of

potential.

these

ICs

comes

into

contact

with

B+

or

B-

voltage,

fine

bare

wire

then

the

FET

which

is

ON

at

that

time

will

either

(stripped

solid

hookup

wire,

etc.)

become

shorted

or

open.

This

is

valid

for

all

the

output

sections

that

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

If

this line

is

grounded,

or

touches

8+

or

B-

bus...,

the

output

stage

of

this

IC

will

be

destroyed.

Fig.

1

Fig.

G

@

When

it

is

necessary

to

handle

the

IC

with

the

fingers,

do

not

touch

any

pin,

and

hold

the

IC

at

the

ends

of

its

plastic-package

case

as

shown

in

Fig.

H.

SP,

Fig.

H

5,

Method

of

Mounting

Insert

the

IC

while

holding

it

with

the

modified

clip,

and

solder

all

the

pins

with

the

clip

still

shorting

the

pins.

(Similarly,

solder

all

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

have

been

soldered.

LOCATION

AND

FUNCTION

OF

CONTROLS

Before

plugging

in

or

attempting

to

operate

this

tuner,

ST-JX44L

it

is

suggested

that

you

familiarize

yourself

with

all its

switches

and

the

purpose

of

each.

Each

number

in

the

photo

is

keyed

to

the

descriptive

text.

i

POWER

switch

Band/frequency-display

window

and

indicators

(See

the

Yap

Band

selector

KD

TUNING

button

STEREO

gyi

iMUTINGSWiteh

3

MEMORY

SCAN

button

@

POWER

switch

Depress

to

turn

on

the

power.

To

turn

the

power

off,

press

the

switch

again.

@

Band

selector

Selects

the

desired

band:

FM,

MW

or

LW.

Each

time

the

selector

is

pressed,

the

band

will

change

and

the

selected

band

wil!

be

indicated

in

the

band/frequency-display

window.

©

TUNING

button

Press

either

side

of

this

button

to

change

the

frequency.

Press

the

left

side

[

-

]

to

go

to

a

lower

frequency

and

the

right

side

{

+

]

to

go

to

a

higher.

To

change

the

frequency

continuously

until

the

desired

frequency

is

received,

keep

the

button

depressed.

The

frequency

figures

will

change

rapidly.

To

change

the

frequency

slowly

(in

0.05

MHz

steps

for

FM,

9

kHz

steps

for

AM

and

MW

and

1

kHz

steps

for

LW),

press

and

immediately

release

the

button.

@

Station

identification

windows

Station

labels

(supplied)

identifying

pre-memorized

stations

can

be

placed

in

these

windows.

@

Station

preset

buttons

To

call

up

a

pre-memorized

station,

press

the

appropriate

button.

@

MEMORY

switch

Press

to

operate

memory

circuit.

The

MEMORY

indicator

will

ap-

pear

on

the

band/frequency-display

window

for

a

few

seconds

in-

dicating

that

the

memory

circuit

is

standing

by.

1®

Station

identification

windows

he

Station

preset

buttons

(a

MEMORY

switch

@

STEREO

switch

This

switch

serves

the

dual

purpose

of

a

mode

and

FM

muting

switch.

Normally

keep

this

switch

engaged

(the

MUTING

indicator

il-

luminates)

to

eliminate

FM

interstation

noise

while

tuning

from

sta-

tion

to

station.

The

tuner

operates

in

stereo

mode

for

stereo

sound

sources

and

will

be

automatically

switched

to

mono

mode

for

monaural

sound

sources.

When

you

want

to

tune

in

a

very

weak

station,

or

when

an

FM

pro-

gram

is

too

noisy,

press

the

switch

to

disengage

it.

(The

MUTING

in-

dicator

illumination

will

go

out.)

This

will

enable

the

tuner

to

receive

weak

stations,

although

the

stereo

feature

is

sacrificed.

in

this

case,

keep

the

amplifier

volume

down

to

avoid

speaker

damage

caused

by

the

interstation

noise.

@

MEMORY

SCAN

button

Press

for

automatic

scanning

of

the

stations

pre-memorized

on

the

station

preset

buttons.

BAND/FREQUENCY-DISPLAY

WINDOW

AND

INDICATORS

B®

MEMORY

indicator

MEMORY,

©

MEMORY

indicator

When

the

MEMORY

switch

is

pressed,

“MEMORY”

will

appear

for

a

few

seconds

indicating

that

the

memory

circuit

is

standing

by.

@

Band/frequency-disptay

Permits

reading

the

received

frequency

at

a

glance

from

the

figures.

@

STEREO

indicator

This indicator

will

light

when

an

FM

stereo

program

of

sufficient

signal

strength

is

tuned

in

with

the

STEREO

switch

engaged.

@®

PRESET

button

indicator

When

the

station

preset

button

is

pressed,

a

figure

from

1

to

8

cor-

responding

to

the

pressed

button

will

appear.

When

the

MEMORY

SCAN

button

is

pressed,

the

figures

will

change

in

sequence.

@®

MUTING

indicator

This

indicator

illuminates

when

the

STEREO

switch

is

engaged.

@®

LOCKED

indicator

This indicator

illuminates

when

a

signal

stronger

than

the

tuner’s

muting

level

is

tuned

in

and

locked.

Band/frequency-display

[E}

LOCKED

indicator

1b}

STEREO

indicator

STEREO

[¥)

PRESET

button

indicator

MUTING

MHz

LOCKED

[K)

MUTING

indicator

Selected

band

FM/MW/LW

\

i

e

|

MANUAL

TUNING

(1

eae

(Q

setectinedesieavang

==

SSS~*S

|

i

|

POWER

|

f

i

|

}

4

Adjust

the

volume

and

tone.

i

=

ere

ee

a

ibis

sscat

j

Amplifier

—)

Proyvrrg

°

foes

Ss

ee

SSs5

(

3

For

FM

reception,

press.

yt

4

Tune

in

the

desired

station,

observing

the

\

|

LOCKED

indicator

and

the

band/frequency

i

display.

i

for

lower

frequencies

for

higher

frequencies

i

r

TUNING

+

-

TUNING

+

|

STEREO

|

i

|

STEREO

|

cle

To

tune

in

a

very

weak

station,

see

below.

MUTNG

When

the

frequency

figures

reach

the

end

of

the

tuning

range

of

each

band,

the

frequency

will

then

be

scanned

from

the

opposite

end

of

the

tuning

range.

se

eee

To

tune

in

a

weak

or

noisy

station

@When

FM

stereo

signals

are

noisy,

or

to

tune

in

a

very

weak

FM

Station,

lower

the

volume

and

disengage

the

MUR

Switch

by

pressing

it

again.

The

MUTING

indicator

illumination

will

go

out.

he

will

result

in

better

reception,

at

the

sacrifice

of

the

stereo

ef-

ect.

ST-JX44L

MEMORY

PRESET TUNING

This

tuner’s

electronic

tuning

system

(utilizing

a

PLL—Phase

Lock-

ed

Loop—

synthesizer)

and

a

memory

circuit

make

tuning

very

easy.

Once

the

frequencies

of

the

stations

you

want

to

tune

in

are

memorized,

all

you

have

to

do

is

push

a

button.

TO

MEMORIZE

STATION

FREQUENCIES

Preparation:

A

total

of

eight

station

preset

buttons

can

be

preset

for

either

FM

or

AM

(MW

and

LW)

in

any

desired

sequence.

Arrange

the

order

of

stations

for

each

station

preset

button

and

note

the

band

and

the

frequency

of

each

in

advance.

Follow

the

numbered

sequence.

1

2

Tune

in

the

desired

station,

following

the

procedure

described

in

“MANUAL

TUNING”.

Illuminates

for

a

few

seconds.

Note

that

the

settings

of

the

muting

Switch

for

atetis

reception

of

“

LOCKED

this

station

are

memorized.

STEREO

Repeat

these

steps

for

each

station

preset

button.

Replace

the

station

labels

to

conform

to

the

selected

pre-

memorized

stations.

Notes

e@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.

e@The

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

CHECK

A

PRE-MEMORIZED

FREQUENCY

After

the

memory

procedure

is

completed,

confirm

the

pre-

memorized

frequency.

Press

the

TUNING

button

and

change

the

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

window.

TO

RECEIVE

A

PRE-MEMORIZED

STATION

Turn

the

POWER

switch

on

and

simply

press

the

desired

station

preset

button.

Memory

of

the

last

received

station

This

tuner

includes

a

memory

circuit

to

remember

the

station

which

had

been

received

for

more

than

one

second

just

before

the

power

was

turned

off.

This

station

will

be

automatically

tuned

in

when

the

power

is

turned

on

again.

This

memory

system

enables

you

to

make

a

timer-activated

recording

from

the

tuner.

10

=

=a

3

While

the

MEMORY

indicator

is

illuminated,

press

the

desired

staticn

preset

button.

STEREO

MEMORY

MUTING

fam

vocken

LAG

The

MEMORY

indicator

will

go

out,

and

the

band,

frequency

and

settings

of

the

ucie.

switch

will

be

memorized.

MEMORY

SCANNING

The

MEMORY

SCAN

button allows

you

to

quickly

hear

what

kind

of

programs

are

being

broadcast

by

the

pre-memorized

stations.

When

you

press

the

MEMORY

SCAN

button,

the

pre-memorized

stations

are

automatically

received

in

order

from

the

pre-

memorized

station

to

the

immediate

right

of

the

station

being

received

for

about

4

seconds

each.

Pushing

a

particular

station

preset

button

stops

the

scanning.

The

scanning

sequence

will

be

shown

by

the

flickering

of

the

figure

in

the

band/frequency

display

window.

After

the

station

preset

button

on

the

far

Pg

ah

a

ice

Ol

cst

right

has

been

activated,

the

button

on

the

,

L

-!

!

far

left

will

be

activated

and

the

sequence

repeated.

Press

to

start

Press

to

stop

memory

scanning.

When

you

press

the

MEMORY

SCAN

button

during

manual

tuning,

scanning

will

start

from

the

station

memorized

on

the

leftmost

sta-

tion

preset

button.

—10—

ST-JX441

SECTION

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CONTROLLER

IC

TCP4621BP-6504/-6505

1C402

(TCP4621BP-6504/-6505)

is

a

microcomputer

IC.

The

terminal

functions

are

as

follows:

Main

Functions:

e

Key

input

detection

e

Fluorescent

indicator

tube

(FL401)

indication

output

¢

Data

transmission

to

PLL

frequency

synthesizer

IC

(IC401:

CX778A)

(16

bit

serial

data)

1C402

Terminal

Functions

FL

tube...

Fluorescent

Indicator

Tube

+B

CLOCK

Signal

input

for

“STEREO”

indication

ee

ners

aera

LATCH

©

Signal

input

for

external

remote

controller

Muting

control

signal

output

MUT.

1

(L:

mute)

Signal

output

for

FM

mode

switch

MUT.

0

(L:

“STE

REO/MUTING”

on)

Signal

input

for

“LOCKED”

indication

(H:

“LOCKED”)

Digit

signal

for

MW/LW

switchi

ignal

;

Grid

6

switching

signal

output

eg

grid

(H:

MW,

L:

LW)

iv

FM/AM

switching

signal

output

(H:

FM,

L:

AM)

CPU

operation

stop

signal

input

(H:

CPU

operation

stop)

Signal

output

for

FL

tube

segment

drive

Reset

signal

input

CLOCK

(1700Hz}

g

h

Microcomputer

clock

input

(360k

Hz)

Grid

5

Digit

signal

output

Grid

4

ee

:

ey

inpu

tor

FL

tube

grid

Grid

3

drive

Grid

2

Grid

1

Digit

signal

output

for

FL

tube

grid

drive

—12—

Sony ST-JX44L User manual

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