Sony St-jx295 User manual

SERVICE

MANUAL

ST-JX290:

This

set

is

the

tuner

section

in

SEN-290

(CND,

E)/SEN-390

(US).

US

Model

E

Model

ST-JIX295/IX390

Canadian

Model

ST-JX295

Photo:

ST-JX390

SPECIFICATIONS

FM

tuner

Frequency

range

Antenna

terminal

87.5

—

108

MHz

300

ohms,

balanced

75

ohms,

unbalanced

iF

10.7

MHz

Sensitivity

S/N

50

dB

sensitive

22.1

dBt

(7

nV)

42.1

dBI

(70

2V)

19.5

dBf

(5

pV)

Usable

sensitivity

(IHF)

80

dB

(mono),

75

dB

(stereo)

0.3%

(mono),

0.5%

(stereo)

at

1

KHz

Signal-to-noise

ratio

Harmonic

distortion

Separation

40

dB

(1

KHz)

Frequency

response

30

Hz

—

15

kHz

“20

dB

Selectivity

55

dB

(400

kHz)

:

AM

suppression

ratio

54

dB

Image

response

ratio

50

dB

IF

response

ratio

90

dB

Spurious

response

ratio

70

dB

Automatic

tuning

threshold

17.8

nV

(30

dBf)

Output

775

mV,

4.7

kohms

(at

75

kHz

deviation)

(ST-JX390)

Sony:

Corporation

Printed

in

AM

tuner

Frequency

range

Antenna

IF

530

—

1,710

kHz

(10

kHz)

531

—

1,710

kHz

(9

kHz)

530

—

1,710

kHz

(10

kHz)

531

—

1,602

kHz

(9

kHz)

Loop

antenna,

External

antenna

terminal

450

kHz

\usica

Model

E

Model

Sensitivity

(999

kHz

or

1,000

kHz)

Signal-to-noise

ratio

Harmonic

distortion

Selectivity

Frequency

response

General

Power

requirements

Power

consumption

500

»nV/m

(when

the

loop

antenna

is

in

use)

54

dB

(mono,

normal)

0.5%

(mono,

normal)

35

dB

(9

kHz,

normal)

38

dB

(10

KHz,

normal)

40

Hz

—

3.5

kHz

+8

dB

(normal)

120

V

AC,

60

Hz

-JX

8

W

ST-JX390

Dimensions

Approx.

430

x

80

x

260

mm

(w/h/d)

(17

x3

%4x

10

“I,

inches)

Weight

Approx.

2.4

kg

(5

Ib

5

oz)

(ST-JX390)

Approx.

2.0

kg

(4

Ib

7

oz)

(ST-JX295)

Supplied

accessories

(ST-JX390)

Remote

control

cord

(1)

Connecting

cord

(1)

FM

wire

antenna

(1)

AM

loop

antenna

(1)

Design

and

specifications

subject

to

change

without

notice.

FM

STEREO/FM-AM

TUNER

ST-JX295/JX390

SAFETY

CHECK-OUT

After

correcting

the

original

service

problem,

perform

the

following

safety

check

before

releasing

the

set

to

the

customer:

Check

the

antenna

terminals,

metal

trim,

‘‘metallized”

knobs,

screws,

and

all

other

exposed

metal

parts

for

AC

leakage.

Check

leakage

as

described

below.

LEAKAGE

TEST

The

AC

leakage

from

any

exposed

metal

part

to

earth

ground

and

from

all

exposed

metal

parts

to

any

exposed

metal

part

having

a

return

to

chassis,

must

not

exceed

0.5mA

(500

microampers).

Leakage

current

can

be

measured

by

any

one

of

three

methods.

1.

A

commercial

leakage

tester,

such

as

the

Simpson

229

or

RCA

WYT-540A.

Follow

the

manufacturers’

instructions

to

use

these

instru-

ments.

2.

A

battery-operated

AC

milliammeter.

The

Data

Precision

245

digital

multimeter

is

suitable

for

this

job.

3.

Measuring

the

voltage

drop

across

a

resistor

by

means

of

a

VOM

or

battery-operated

AC

volt-

meter.

The

“limit”

indication

is

0.75

V,

so

analog

meters

must

have

an

accurate

low-

voltage

scale.

The

Simpson

250

and

Sanwa

SH-63Trd

are

examples

of

a

passive

VOM

that

is

suitable.

Nearly

all

battery

operated

digital

multimeters

that

have

a

2V

AC

range

are

suitable.

(See

Fig.

A)

To

Exposed

Metal

Parts

on

Set

AC

voltmeter

(0.75

V)

—=

Earth

Ground

Using

an

AC

voltmeter

to

check

AC

leakage.

TABLE

OF

CONTENTS

section

Title

Page

Specification

Coe

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Safety

Check-out

POUTITTRTTTTILESTTTITITI

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TT

2

A

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Git

ees

aes

3

2.

ELECTRICAL

ADJUSTMENT

FM

Section

POUTTETETITITITITETITIET

TEES

TTT

TT

TILT

T

TTT

TTT)

4

AM

Section

POUT

TULTITISETITETIT

TUTTLE

LITTER

TTT TTT

TTT

4

3.

DIAGRAM

3-1,

Block

Diagram

OHHH

HEHEHE

H

HEHE

HEHOH

HEHEHE

HHH

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5

3-2,

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Wiring

Boards

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5.

ELECTRICAL

PARTS

LIST

-v:-ssssseseeoe

20

To

change

the

AM

tuning

interval

The

AM

tuning

interval

is

preset

at

the

factory

to

10

kHz

to

match

the

frequency

allocation

system

of

your

country.

To

change

the

interval

to

9

KHz,

proceed

as

follows.

1

Depress

the

POWER

switch

to

turn

on

the

unit.

2

Set

the

BAND

FM/AM

selector

to

AM.

3

Press

the

POWER

switch

to

turn

off

the

unit.

4

Hold

the

TUNING

knob

in

the

“+”

position,

and

depress

the

POWER

switch

to

turn

on

the

unit.

To

reset

the

interval

to

10

kHz,

follow

the

same

procedure.

Note

When

the

interval

is

changed,

all

preset

stations

which

you

have

memorized

using

the

numeric

buttons

will

be

erased

from

the

memory.

After

changing

the

interval,

be

sure

to

preset

the

stations

again.

ST-JX295/JX390

SECTION

1

GENERAL

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ST-JX295/JX390

SECTION

2

ELECTRICAL

ADJUSTMENT

FM

SECTION

e@

FM

Discriminator

Alignment

(NULL

check)

Setting

:

FM

RF

stereo

signal

generator

Carrier

frequency

:

98

MHz

Output

level

:

60

dBy

FM

ANTENNA

3002

terminals

VOM

TP1

(DC

range)

NULL

terminal

Procedure

:

1.

Tune

the

set

to

98

MHz,

2,

Adjust

T21

for

0

V

reading

on

the

VOM,

Note:

FM

TUNING

LEVEL

adjustment

should

be

macle

after

FM

discriminator

alignment,

e

FM

TUNING

LEVEL

Adjustment

Setting

:

FM

RF

stereo

signal

generator

Carrier

frequency

:

98

MHz

Output

level

:

25

dBy

FM

ANTENNA

300Q

terminals

Procedure

:

1,

Tune

the

set

to

98

MHz,

2,

Adjust

RV24

so

that

the

TUNED

LED

goes

on,

AM

SECTION

e

AM

Tuned

Indication

Lighting

Level

Adjustment

Setting

:

AM

RF

signal

generator

Put

the

lead-wire

antenna

close

to

ye

the

set,

C=

30%

amplitude

modulation

by

400

Hz

signal

Output

level

:

58

dBy

Procedure

:

1,

Tune

the

set

to

1,050

kHz

(US,

CANADIAN),

999

kHz

(E),

2,

Adjust

RV22

so

that

the

TUNED

LED

goes

on,

@

FM

Stereo

Separation

Adjustment

Setting

:

FM

RF

stereo

signal

generator

VTVM

ANTENNA

ST-JX295

:

CNJ4

(1

or

3

PIN)

FM

ANT

(3002)

S7T-3xX390:

PJ1

Carrier

frequency

:

98

MHz

Output

Jevel

:

60

dBy

Procedure

:

Tune

the

set

to

98

MHz,

FM.

stereo

signal

generator

output

channel

VTVM

connection

reading

(dB)

Adjust

OM

for

minimum

reading,

Adjust

RV21

for

minimum

reading,

L-CH

Stereo

separation

:

(A)

=

(B)

R-CH

Stereo

separation:

(C)

~

(D)

The

separations

of

both

channels

should

be

equal,

RV22:

Tuned

Level

Adjustment

(AM)

RV24

:

Tuned

Level

Adjustment

(FM)

T21

:

Null

Adjustment

RV21

:

Stereo

Separation

Adjustment

ST-JX295/JX390

SECTION

3

DIAGRAMS

3-1.

BLOCK

DIAGRAMS

[TUNER

BOARD]

&M

BEJIE

MEX

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ST-4X390

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|

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BOARD]

power

suppcy

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FM

FRONT-END

(SEGMENT)

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1024

GND

LA85IN

|

FM

DET

MPX

TUNED

|

;

:

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SYSTEM

CONTROL

INDICATOR

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KEY

BOARD

>

|

DECORDER

STEREO

SW

|

AM,ANT

FES1

|

MW

RF

BLOCK

TP1

y

L2

(NULL)

R

OSC

GND

cl

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SWITCH

MATRIX

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|

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FLAG

ACUMLATOR

H.V

REGISTOR

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CN3

TRANSFORMER

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of

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CONTROL

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CONTROL

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AC

IN

SYSTEM

CLOCK

CONTROL

Tm

(14)—(15)

INTERRUPT

CONTROL

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GENERATOR

9

SEPARATION:

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CN701

ST-JX295/JX390

3-2.

PRINTED

WIRING

BOARDS

e

Semiconductor

Location

Note:

@

Color

code

or

sleeving

over

the

end

of

the

jacket.

@

O-——~:

parts

extracted

from

the

component

side.

®

tte

:

indicates

side

identified

with

part

number.

[Note

on

Inserting

the

Cord

to

the

Connector

on

Tuner

Board]

®

Insert

the

cord

to

the

connector

fitting

@

of

the

cord

in

accordance

with

the

white

mark

on

the

board

at

the

connector

as

shown

in

the

figure,

—

cord

©

connector

white

mark

@

Semiconductor

Lead

Layouts

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EQA02-30B

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28C2785

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EXPLODED

VIEW

NOTE:

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The

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parts

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no

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Due

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parts

with

part

number

in

the

exploded

views

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construction

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assembled

part

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number

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Color

Indication

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Appearance

Parts

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(RED)

...KNOB,

BALANCE

(WHITE)

The

components

mark

ST-JX295/JX390

identified

by

or

dotted

line

with

mark

are

critical

for

safety.

Replace

only

with

part

number

specified.

Les

composants

identifiés

par

une

marque

sont

critiques

pour

la

sécurité.

Ne

les

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par

une

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portant

le

numéro

spéci

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&

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Description

Remarks

_

PLATE

(ST),

GROUND

(JX295:US

,Canadian)

e

Items

marked

“*"’

are

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stocked

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A

they

are

seldom

required

for

routine

t

service.

Some

delay

should

be

antici-

Cabinet's

Color

Parts’

Color

pated

when

ordering

these

items.

(1)

ST-JX295

ST-JX390

|

iin

ST-JX390

not

supplied

net

supplied

No.

Part

No.

Description

Remarks

No.

Part

No.

]

4~922-790-11

KNOB

(TUNING)

21

*4-924-988—1

|

901

*A~4333~-249—A

2

X-4905-263-1

(JX295)...PANEL

ASSY,

FRONT

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X-4905~-264—]

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*

A-4333-250-A

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7-682-548-04

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POWER

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7-685-534-19

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TYPE2

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902

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99-1

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6

4-9]

7-050-41

CASE

903

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3~704-366-01

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(CASE)

(3X8)

904

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8

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(JX295)......

PANEL,

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3-174-A

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A=-4303-175-A

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7-685-646-79

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7-682-550-04

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CN5O1A.1-540-057—

12

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0

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ES

13

*4-917-044—11

(3X390)...BRACKET

(PT)

FL70)

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14

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HOLDER,

PC

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=

1-565-352-21

15

X-4904-496-1

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TRANSFORMER,

POWER

(JX390)..SWITCH,

PUSH

(AC

POWER)(1

KEY)

(JX390:

E)....SWITCH,

VOLTAGE

CHANGE

Sony ST-JX295 User manual

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