Sony ST-S444ES Manuale utente

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>

FM

tuner

section

: : :

—s]

Tuning

range

87.5

MHz

-

108

MHz

Signal-to-noise

ratio

5

is

el

ns

Gene

Antenna

terminals

Pe

75

ohms,

unbalanced

Harmonic

distortion

|Mono:

0.03

%

(WIDE),

0.05

%

Intermediate

frequency

at

1

kHz

(NARROW)

10.7

MHz

Stereo:

0.04

%

(WIDE),

0.06

%

(NARROW)

;

IM

distortion

Mono:

0.03

%

(WIDE),

0.05

%

AEP,

UK

model

|

US,

Canadian,

€

Nesdon

Re

(at

40

kHz

model

(at

75

kHz

|

Stereo:

0.04

%

(WIDE),

0.06

%

deviation)

deviation)

|

(NARROW)

|

é

Sensitivity

at

46

dB

quieting

|at50

dB

quieting

|

Separation

17.3

dBf,

2

uV

16.8

dBf,

1.8

pV

at

1

kHz

60

dB

(mono)

(mono)

37.9

dBf,

22.5

yV|

37.9

dB,

22.5

pV

Frequency

response

|

40

Hz

-

12.5

kHz

(stereo)

(stereo)

+0.2

dB

30

Hz

-

15

KHz

r

30

Hz

-

15

kHz

+0.2

dB

Usable

sensitivity

|10.3

dBf,0.9yV

|

10.3

dBf,

0.94V

+0.2

dB

ve

(IHF)

(IHF)

~0.5

0.8

pV

(S/N

=

26

dB)

Selectivity

at

300

kHz

at

400

kHz

30

(WIDE)/57

60

(WIDEV90

_

(NARROW)

dB

(NARROW)

dB

MICROFILM

}

SAFETY-RELATED

COMPONENT

WARNING!!

COMPONENTS

IDENTIFIED

BY

SHADING

AND

MARK

A

ON

THE

SCHEMATIC

DIAGRAMS

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.

ATTENTION

AU

COMPOSANT

AYANT

RAPPORT

A

LA

SECURITE!

LES

COMPOSANTS

IDENTIFIES

PAR

UNE

TRAME

ET

UNE

MARQUE

A

SUR

LES

DIAGRAMMES

SCHE-

MATIQUES

ET

LA

LISTE

DES

PIECES

SONT

CRITIQUES

POUR

LA

SECURITE

DE

FONCTIONNEMENT.

NE

REM-

PLACER

CES

COMPOSANTS

QUE

PAR

DES

PIECES

SONY

DONT

LES

NUMEROS

SONT

DONNES

DANS

CE

MANUEL

OU

DANS

LES

SUPPLEMENTS

PUBLIES

PAR

SONY.

US

Model

Canadian

Model

AEP

Model

UK

Model

E

Model

Capture

ratio

1.0

dB

AM

suppression

ratio

65

dB

Image

response

ratio

120

dB

IF

response

ratio

120

dB

—

Continued

on

next

page

—

FM

STEREO

/FM-AM

TUNER

ON

Y.

ST-S444ES

Spurious

response

ratio

120

dB

RF

intermodulation

88

dB

(IHF)

Muting

threshold

Approx.

29

dBf,

8uV

Auto

tuning

threshold

Approx.

29

dBf,

8uV

Output

level/impedance

at

75

kHz

deviation

750

mV,

620

ohms

Cal

tone

400

Hz,

50

%

mod

AM

tuner

section

Tuning

range

AEP,

UK,

E

model:

531

-

1,602

kHz

US,

Canadian,

E

model:

531

-

1,602

kHz

(with

the

AM

channel

plan

selector

set

at

9

kHz)

530

-

1,610

kHz(with

the

AM

channel

plan

selector

set

at

10

kHz)

LAYOUT-FREE

AM

antenna

External

antenna

terminal

Intermediate

frequency

450

kHz

Usable

sensitivity

LAYOUT-FREE

AM

antenna

300

pV/m

(at

999

or

1,000

kHz)

External

antenna

30

uV

(at

999

or

1,000

kHz)

Signal-to-noise-ratio

Antenna

54dB

Harmonic

distortion

0.3

%

Selectivity

AEP,

UK

model:

35

dB

US,

Canadian,

E

model:

35

dB

(9

kHz),

38

dB

(10

kHz)

Image

response

ratio

42

dB

(at

999

or

1,000

kHz)

Auto-tuning

threshold

Approx.

1mV/m

General

System

PLL

quartz-locked

digital

synthesizer

system

FM

stereo,

FM/AM

super-heterodyne

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

Hz

US,

Canadian

model:

120

V

ac,

60

Hz

E

model:

120,

220

or

240

V

ac

adjustable,

50/60

Hz

Power

consumption

18

watts

Dimensions

Approx.

430

x

80

x

340

mm

(w/h/d)

(17

x

34/4

x

134/2

inches)

including

projecting

parts

and

controls

Weight

Approx.

4.4

kg

(12

Ibs

21

02)

net

While

the

information

given

is

true

at

the

time

of

print-

ing,

small

production

changes

in

the

course

of

our

com-

pany’s

policy

of

improvement

through

research

and

design

might

not

necessarily

be

indicated

in

the

specifications.

We

would

ask

you

to

check

with

your

ap-

pointed

Sony

dealer

if

clarification

on

any

point

is

required.

PDP

PL

PL

LL

LLL

LL DL

LDL

DL

DL

DL

DOLL

DLL

LLL

LL

LDL

PDO

DOLL

DL

DL

LLLP

DL

LDS

LDL

DL

LL

POLL

DLL LOL

LLL ODL

OEP

DO

OE

OL

OE

OOD LOL

OCOCOOOR

OOD

~

MODEL

IDENTIFICATION

—

(Specification

Label)

SONY:

FM

STEREO/FM-AM

TUNER

MODEL

NO,

ST-S444ES

US

model:

AC120V

60Hz

18W

Canadian

model:

AC120V

60Hz

18W

AEP

model:

AC

220V~

50/60Hz

18W

UK

model:

AC

240V~

50/60Hz

18W

E

model:

AC

120/220/240V

~

50/60Hz

18W

SAFETY

CHECK-OUT

(US

Model)

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

microamperes).

Leakage

current

can

be

measured

by

any

one

of

three

methods.

1.

N

Fig.

A.

Using

an

AC

voltmeter

to

check

AC

leakage.

A

commercial

leakage

tester,

such

as

the

Simpson

229

or

RCA

WT-540A.

Follow

the

manufacturers’

instructions

to

use

these

instru-

ments.

A

battery-operated

AC

milliammeter.

The

Data

Precision

245

digital

multimeter

is

suitable

for

this

job.

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

(See

Fig.

A)

suitable.

To

Exposed

Metal

Parts

on

Set

AC

voltmeter

0.15

uF

°

(0.75

V)

ie

5kQ

ae

+

Earth

Ground

ST-S444ES

FEATURES

PLL-CIRCUIT

EMPLOYING

DIRECT

COMPARATOR

TECHNOLOGY

The

ST-S444ES

with

its

refined

Phase

Locked

Loop

(PLL)

circuit

can

tune

to

a

frequency

with

extraordinary

precision.

An

IC

developed

by

Sony

allows

the

comparison

fre-

quency

to

be

as

high

as

the

50

kHz

channel

spacing

fre-

quency,

thus

eliminating

the

tendency

of

a

low

com-

parison

frequency,

which

was

formerly

generally

em-

ployed,

to

slip

into

the

audio

range

and

degrade

the

signal-to-noise

ratio.

The

local

oscillator

output

can

therefore

be

directly

supplied

to

the

programmable

divider

section

without

an

additional

pre-scaler.

We

call

this

PLL-circuit

technology

the

Direct

Comparator

meth-

od.

The

result

is

almost

rippleless

local

oscillation,

greatly

reduced

spurious

radiation,

and

an

extremely

high

signal-to-noise

ratio.

STATE

OF

THE

ART

Every

element

of

the

ST-S444ES

is

chosen

with

an

eye

to

optimum

reception.

Dual-gate

MOS

FETs

in

the

RF

amplifier,

and

five

varactors

in

the

front-end

block

in-

sure

high

sensitivity

and

an

excellent

spurious

response

ratio.

Four

uni-phase

filters

in

the

IF

amplifier

provide

high

selectivity.

The

PLL

multiplex

decoder

with

a

pilot

canceler

insures

a

flat

frequency

response,

clear

sepa-

ration

and

very

low

distortion.

EFFORTLESS

TUNING

Tuning

is

easy

using

the

digital

frequency

readout

in

the

frequency

display

window.

Three

methods

of

tuning

are

available

:

Automatic

tuning,

in

which

the

entire

AM

or

FM

band

is

scanned

automatically

until

a

signal

is

received.

Manual

tuning,

in

which

the

AM

or

FM

band

can

be

scanned

either

rapidly

or

step-by-step.

Memory

preset

tuning,

in

which

the

frequencies

of

up

to

eight

stations

can

be

stored.

In

this

mode,

this

infor-

mation

will

be

retained

when

the

power

is

turned

off

so

that

you

can

tune

in

your

favorite

station

with

the

push

of

a

button.

Various

conditions

can

also

be

memorized

for

each

individual

station

to

permit

one-touch

reception.

All

the

memorized

settings

are

displayed

in

the

FL

display

window.

The

SCAN/READ

button

allows

you

to

scan

automa-

tically

the

preset

stations

only,

listening

to

each

one

for

a

few

seconds

to

check

if

there

is

anything

you

would

like

to

listen

to.

ST-S444ES

A.C.T.

(AUDIO

CURRENT

TRANSFER)

CIRCUIT

This

tuner

employs

the

A.C.T.

technique

developed

for

Sony

integrated

amplifiers.

The

A.C.T.

circuit

design

vir-

tually

eliminates

the

problems

which

the

conventional

voltage

transfer

design

had:

electrical

interference

be-

tween

the

left

and

right

channels,

decreased

sound

quality,

distortion,

noise,

etc.

caused

by

the

fact

that

both

the

signal

source

current

and

the

power

supply

cur-

rent

flow

through

the

same

ground.

This

technique

insures

the

tuner’s

high-quality

recep-

tion

performance.

PROGRAM

FUNCTION

Using

the

Program

Function,

you

can

automatically

tune

in

to

up

to

four

stations

which

have

been

memoriz-

ed

in

any

sequence

you

want.

Stations

will

be

received

one

by

one

as

the

power

is

turned

on

and

off

by

an

op-

tional

timer.

This

Program

Function

enables

timer-

activated

reception

or

recording

of

a

number

of

stations

as

compared

to

the

single

station

capability

of

conven-

tional

tuners.

OTHER

REFINEMENTS

The

HI-BLEND

switch

reduces

noise

in

FM

stereo

rece-

tion.

The

ten-step

SIGNAL

indicator

shows

the

strength

of

the

tuned

signal.

The

CAL

(CALibration)

TONE

button

produces

a

400

Hz,

50

%

mod.

signal

(equivalent

to

37.5

kHz

deviation),

which

is

useful

for

calibrating

the

recording

level

on

a

tape

deck.

The

two-pole

beat-cut

filter

is

positioned

before

the

multi-

plex

circuit

to

assure

better

FM

stereo

reception.

OPERATING

VOLTAGE

Before

connecting

the

unit

to

the

power

source,

check

that

the

operating

voltage

of

your

unit

is

the

same

as

the

local

power

line

voltage.

AEP

mode!

operates

on

220

V

ac

(or

240

V

ac

adjustable

by

authorized

Sony

personnel).

.

UK

model

operates

on

240

V

ac

(or

220

V

ac

adjustable

by

authorized

Sony

personnel).

The

USA

and

Canada

models

operate

only

on

120

V

ac.

The

E

model

operates

on

either

120,

220

or

240

V

ac.

The

voltage

selector

is

located

on

the

rear

panel.

If

the

selector

must

be

reset,

disconnect

the

ac

power

cord

and

turn

the

selector

with

a

coin

so

that

the

arrow

mark

of

the

selector

points

to

the

proper

voltage

figure.

PRECAUTIONS

On

safety

eBefore

operating

the

unit,

be

sure

that

the

operating

voltage

of

your

unit

is

identical

with

that

of

your

local

power

supply.

eShould

any

liquid

or

soild

object

fall

into

the

cabinet,

unplug

the

unit

and

have

it

checked

by

qualified

person-

nel

before

operating

it

any

further.

e

Unplug

the

unit

from

the

wall

outlet

if it

is

not

to

be

used

for

an

extended

period

of

time.

To

disconnect

the

cord,

pull

it

out

by

grasping

the

plug.

Never

pull

it

out

by

the

cord.

On

installation

eDo

not

install

the

unit

in

a

location

near

heat

sources

such

as

radiators

or

air

ducts,

or

in

a

place

subject

to

direct

sunlight,

excessive

dust,

mechanical

vibration

or

shock.

eGood

air

circulation

is

essential

to

prevent

internal

heat

build-up

in

the

unit.

Place

the

unit

in

a

location

with

adequate

air

circulation.

On

operation

eWhen

the

unit

is

not

in

use,

turn

the

power

off

to

con-

serve

energy

and

to

extend

the

useful

life

of

your

unit.

eSet

the

PROGRAM

switch

to

OFF

when

the

Program

Function

is

not

being

used.

If

this

is

not

done,

you

can-

not

tune

with

the

TUNING

or

station

preset

buttons.

On

cleaning

Clean

the

cabinet,

front

and

rear

panels

periodically

with

a

soft

dry

cloth.

If

the

stains

are

difficult

to

remove,

use

a

cloth

moistened

with

a

mild

detergent

solution.

Do

not

use

solvents

such

as

alcohol,

benzine

or

thinner,

since

they

will

damage

the

finish.

On

repacking

Do

not

throw

away

the

carton

and

the

packing

material.

It

makes

an

ideal

container

to

transport

the

unit

in.

When

shipping

the

unit

for

repair

work

or

to

another

location,

repack

it

as

illustrated

on

the

carton

box.

For

the

customers

in

the

USA

For

detailed

safety

precautions,

see

the

leaflet

“IMPOR-

TANT

SAFEGUARDS”.

Note

about

the

AM

channel!

plan

selector

This

tuner

has

a

two-position

AM

channel

plan

selector

underneath

the

right

front

corner.

To

tune

in

AM

sta-

tions

correctly,

the

selector

should

be

correctly

set

ac-

cording

to

the

AM

frequency

allocation

system

of

your

country.

9kHz:

for

countries

where

the

frequencies

are

allo-

cated

at

intervals

of

9

kHz.

10

kHz:

for

countries

where

the

frequencies

are

allo-

cated

at

intervals

of

10

kHz,

for

example,

the

USA

and

Canada.

This

selector

is

factory

preset.

If

the

AM

frequencies

are

not

allocated

at

intervals

in

your

country,

the

selector

setting

should

be

changed.

Be

sure

to

turn

off

the

power

before

changing

the

position

of

the

selector.

SECTION

1

ST-S444ES

OUTLINE

1-1.

FUNCTION

OF

CONTROLS

Each

number

in

the

text

is

keyed

to

that

of

the

photo

above.

@

POWER

switch

Depress

to

turn

on

the

power.

To

turn

the

power

off,

press

the

switch

again.

@

TUNE

MODE

button

To

tune

in

a

station

with

the

automatic

tuning

system,

press

this

button

so

that

the

TUNING

AUTO

indicator

lights

up.

When

you

want

to

tune

with

manual

tuning

system,

press

the

button

again

so

that

the

TUNING

MANUAL

in-

dicator

lights

up.

AM

(FY

EI

TT)

kHz

FM

Li

Li,

|

MHz

STEREO

12345678910

HI-BLENDe

ON

leds

MUTING

e

ON.

lelag

le]8]

3

e

STEREO

MONO

|

TUNING

«

AUTO

MANUAL

SIGNAL

PROGRAMM

1.20314)

iF

BAND

*

WIDE

NARROW

“wl

|

©

MUTING/MODE

button

This

button

serves

a

dual

purpose:

it

is

a

muting

switch

and

FM

mode

selector.

To

tune

in

a

strong

FM

station,

press

the

button

so

that

the

MUTING

ON

and

MODE

STEREO

indicators

light

up.

In

this

mode,

the

muting

circuit

will

pe

activated

to

eliminate

interstation

noise

while

tuning

and

the

FM

station

will

be

received

in

stereo

mode.

When

you

want

to

tune

in

a

very

weak

FM

staion,

press

the

button

again

so

that

the

MUTING

OFF

and

MODE

MONO

indicators

light

up.

The

muting

circuit

will

be

deactivated

and

the

FM

station

is

received

in

monaural

mode.

In

this

mode,

keep

the

amplifier

volume

down

to

avoid

speaker

damage

caused

by

interstation

noise

dur-

ing

tuning.

—5—

ST-S444ES

©

FM/AM

selector

button

Selects

the

desired

band:

FM

or

AM.

The

selected

band

wili

be

indicated

in

the

display

window.

©

!F

BAND

button

Normally

press

this

button

so

that

the

IF

BAND

WIDE

in-

dicator

lights

up.

Low-distortion,

hi-fi

FM

broadcasting

sound

can

be

obtained.

When

there

is

interference

by

adjacent

stations,

press

the

button

so

that

the

IF

BAND

NARROW

indicator

lights

up.

The

higher

selectivity

will

improve

the

reception.

@

HI-BLEND

button

When

FM

stereo

signals

are

weak

and

noisy,

press

this

button

so

that

the

HI-BLEND

ON

indicator

lights

up.

This

will

provide

better

reception,

although

the

stereo

effect

at

high

frequencies

is

slightly

reduced.

To

deactivate

the

high-biend

circuit,

press

the

button

again.

The

HI-BLEND

OFF

indicator

will

light

up.

@

CAL

TONE

button

Normally

press

this

button

so

that

the

CAL

TONE

in-

dicator

is

not

lit.

To

obtain

a

400

Hz,

50

%

modulated

signal

for

adjusting

the

recording

level

on

a

cassette

deck,

press

the

button.

The

CAL

TONE

indicator

will

light

up.

Generally,

on

cassette

decks,

adjust

the

recording

level

so

that

the

peak

meters

to

—4dB,

and

on

reel-to-reel

tape

decks

the

peak

level

meters

deflect

as

close

as

possible

to

0dB.

However,

depending

on

the

broadcast

programs

or

the

tapes

you

use,

some

further

ad-

justments

may

be

necessary.

You

can

determine

the

most

appropriate

recording

level

for

your

tape

deck

after

several

trials,

using

the

suggested

levels

as

a

star-

ting

point.

To

deactivate

the

cal

tone

circuit,

press

the

CAL

TONE

button

again.

@

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.

During

automatic

tuning:

Press

to

start

automatic

fre-

quency

scanning.

The

frequencies

below

or

above

that

shown

on

the

display

window

will

be

scanned

automa-

tically

until

a

signal

is

received.

To

resume

scanning,

press

the

button

again.

During

manual

tuning:

Press

and

keep

the

TUNING

button

depressed

to

change

the

frequency

continuously

until

the

figures

in

the

frequency

display

window

ap-

proach

the

desired

frequency.

The

frequency

figures

will

change

rapidly.

To

change

the

frequency

slowly

(in

0.05

MHz

steps)

to

tune

in

a

station

accurately,

press

the

button

and

release

immediately.

When

the

frequency

figures

reach

the

end

of

the

tuning

range,

the

frequency

will

then

be

scanned

from

the

op-

posite

end

of

the

tuning

range.

©

Station

preset

buttons

and

station

identification

windows

To

call

up

a

memorized

station,

press

the

appropriate

button.

Station

labels

(supplied)

identifying

memorized

stations

can

be

placed

in

the

station

identification

windows

above

the

buttons.

@

SCAN/READ

button

This

button

has

a

dual

purpose.

With

the

PROGRAM

switch

set

to

OFF,

it

works

as

a

memory

SCAN

button

and

with

the

PROGRAM

switch

set

to

ON,

as

a

program

READ

button.

SCAN

button:

Press

to

automatically

scan

the

sta-

tions

memorized

on

the

station

preset

buttons.

READ

button:

By

pushing

this

button,

the

programmed

station

order

can

be

checked.

@

MEMORY/SET

button

This

button

has

a

dual

purpose.

With

the

PROGRAM

switch

set

to

OFF,

it

works

as

a

MEMORY

button

and

with

the

PROGRAM

switch

set

to

ON,

as

a

program

SET

button.

MEMORY

button:

Press

to

memorize

the

tuned

station

to

a

station

preset

button.

The

MEMORY

indicator

will

appear

in

the

frequency

display

window

for

a

few

seconds

indicating

that

the

preset

memory

circuit

is

standing

by.

SET

button:

Press

to

program

the

preset

stations

in

the

desired

order.

The

MEMORY

indicator

will

appear

in-

dicating

that

the

program

circuit

is

standing

by.

@®

PROGRAM

switch

To

use

the

program

function,

set

this

switch

to

ON.

For

ordinary

use,

be

sure

to

keep

the

switch

in

the

OFF

position.

Display

window

®

IF

BAND

indicator

Indicates

the

setting

of

the

IF

BAND

button.

@®

HI-BLEND

indicator

Indicates

the

setting

of

the

HI-BLEND

button.

®

MUTING

indicator

Indicates

the

setting

of

the

MUTING/MODE

button.

@

MODE

indicator

Indicates

the

setting

of

the

MUTING/MODE

button.

@

TUNING

indicator

The

AUTO

indicator

shows

the

automatic

tuning

mode,

and

the

MANUAL

indicator,

the

manual

tuning

mode

set

with

the

TUNE

MODE

button.

®

CAL

TONE

indicator

Lights

up

to

show

that

a

400

Hz

calibrating

tone

signal

is

provided

by

the

CAL

TONE

button.

®

ME

Whe

will

a

ry

cirg

@

Ba

The

q

here.

@

ST

This

i

suffia

MUTI

@

SIG

Indica

unt

o

mean

dicatd

ante

The

|

tical

@®

PR

With

progr

disple

T-S444ES

ST-S444ES

g

switch

1sS0

that

light

up.

vated

to

the

FM

nN,

press

d

MODE

t

will

be

1ONaural

down

to

dise

dur-

©

FM/AM

selector

button

Selects

the

desired

band:

FM

or

AM.

The

selected

band

will

be

indicated

in

the

display

window.

@

IF

BAND

button

Normally

press

this

button

so

that

the

IF

BAND

WIDE

in-

dicator

lights

up.

Low-distortion,

hi-fi

FM

broadcasting

sound

can

be

obtained.

When

there

is

interference

by

adjacent

stations,

press

the

button

so

that

the

IF

BAND

NARROW

indicator

lights

up.

The

higher

selectivity

will

improve

the

reception.

©

HI-BLEND

button

When

FM

stereo

signals

are

weak

and

noisy,

press

this

button

so

that

the

HI-BLEND

ON

indicator

lights

up.

This

will

provide

better

reception,

although

the

stereo

effect

at

high

frequencies

is

slightly

reduced.

To

deactivate

the

high-blend

circuit,

press

the

button

again.

The

HI-BLEND

OFF

indicator

will

tight

up.

@

CAL

TONE

button

Normally

press

this

button

so

that

the

CAL

TONE

in-

dicator

is

not

lit.

To

obtain

a

400

Hz,

50

%

modulated

signal

for

adjusting

the

recording

levei

on

a

cassette

deck,

press

the

button.

The

CAL

TONE

indicator

will

light

up.

Generally,

on

cassette

decks,

adjust

the

recording

level

so

that

the

peak

meters

to

—4dB,

and

on

reel-to-reel

tape

decks

the

peak

level

meters

deflect

as

close

as

possible

to

0

dB.

However,

depending

on

the

broadcast

programs

or

the

tapes

you

use,

some

further

ad-

justments

may

be

necessary.

You

can

determine

the

most

appropriate

recording

level

for

your

tape

deck

after

several

trials,

using

the

suggested

levels

as

a

star-

ting

point.

To

deactivate

the

cal

tone

circuit,

press

the

CAL

TONE

button

again.

©

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.

During

automatic

tuning:

Press

to

start

automatic

fre-

quency

scanning.

The

frequencies

below

or

above

that

shown

on

the

display

window

will

be

scanned

automa-

tically

until

a

signal

is

received.

To

resume

scanning,

press

the

button

again.

During

manual

tuning:

Press

and

keep

the

TUNING

button

depressed

to

change

the

frequency

continuously

until

the

figures

in

the

frequency

display

window

ap-

proach

the

desired

frequency.

The

frequency

figures

will

change

rapidly.

To

change

the

frequency

slowly

(in

0.05

MHz

steps)

to

tune

in

a

station

accurately,

press

the

button

and

release

immediately.

When

the

frequency

figures

reach

the

end

of

the

tuning

range,

the

frequency

will

then

be

scanned

from

the

op-

posite

end

of

the

tuning

range.

@

Station

preset

buttons

and

station

identification

windows

To

call

up

a

memorized

station,

press

the

appropriate

button.

Station

labels

(supplied)

identifying

memorized

stations

can

be

placed

in

the

station

identification

windows

above

the

buttons.

@

SCAN/READ

button

This

button

has

a

dual

purpose.

With

the

PROGRAM

switch

set

to

OFF,

it

works

as

a

memory

SCAN

button

and

with

the

PROGRAM

switch

set

to

ON,

as

a

program

READ

button.

SCAN

button:

Press

to

automatically

scan

the

sta-

tions

memorized

on

the

station

preset

buttons.

READ

button:

By

pushing

this

button,

the

programmed

station

order

can

be

checked.

@

MEMORYISET

button

This

button

has

a

dual

purpose.

With

the

PROGRAM

switch

set

to

OFF,

it

works

as

a

MEMORY

button

and

with

the

PROGRAM

switch

set

to

ON,

as

a

program

SET

button.

MEMORY

button:

Press

to

memorize

the

tuned

station

to

a

station

preset

button.

The

MEMORY

indicator

will

appear

in

the

frequency

display

window

for

a

few

seconds

indicating

that

the

preset

memory

circuit

is

standing

by.

SET

button:

Press

to

program

the

preset

stations

in

the

desired

order.

The

MEMORY

indicator

will

appear

in-

dicating

that

the

program

circuit

is

standing

by.

@

PROGRAM

switch

To

use

the

program

function,

set

this

switch

to

ON.

For

ordinary

use,

be

sure

to

keep

the

switch

in

the

OFF

position.

Display

window

@®

IF

BAND

indicator

Indicates

the

setting

of

the

IF

BAND

button.

@

HI-BLEND

indicator

Indicates

the

setting

of

the

HI-BLEND

button.

®

MUTING

indicator

Indicates

the

setting

of

the

MUTING/MODE

button.

@

MODE

indicator

Indicates

the

setting

of

the

MUTING/MODE

button.

@®

TUNING

indicator

The

AUTO

indicator

shows

the

automatic

tuning

mode,

and

the

MANUAL

indicator,

the

manual

tuning

mode

set

with

the

TUNE

MODE

button.

®

CAL

TONE

indicator

Lights

up

to

show

that

a

400

Hz

calibrating

tone

signal

is

provided

by

the

CAL

TONE

button.

:

@®

MEMORY

indicator

When

the

MEMORY/SET

button

is

pressed,

“MEMORY”

will

appear

for

a

few

seconds

indicating

that

the.memo-

ry

circuit

is

standing

by..

@

Band/frequency

display

The

band

and

frequency

being

received

is

displayed

here.

@

STEREO

indicator

This

indicator

will

light

when

an

FM

stereo

program

of

sufficient

signal

strength

is

tuned

in

with

the

MUTING/MODE

button

set

to

STEREO.

@®

SIGNAL

indicator

Indicates

the

strength

of

the

tuned

signal

by

the

amo-

unt

of

indicator

illumination.

The

fullest

illumination

means

the

antenna

input

signal

is

strong.

When

the

in-

dicator

illuminates

only

at

the

low

end,

it

means

the

antenna

input

signal

is

weak.

The

lines

tracing

the

upper

and

lower

ends

of

the

ver-

tical

bars

indicate

the

signal-to-noise

ratio

curves.

@®

PROGRAM

indicator

With

the

PROGRAM

switch

set

to

ON,

the

order

in

the

programmed

sequence

of

the

station

being

received

is

displayed

here.

ST-S444ES

ST-S444ES

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13,17,

18,

71,72

-—X_

24-28,

4,

42-44

IO

=52

,

54~60,62—68,70

-X

19-21,

23-29,

31-34,

40

i}

ny

PT9OI

0-@

VOL

REG

Q501

,Q502

RECT

D501

,0502

B+2

15.7V

SWITCHING

Q62I

RECT

0503

,0504

VOL

REG

8+3

STATIC

6.4V

DRIVE

'c8ol

0505,

D506

iC50}

6V

RESET

B+!

29.5

RECT

0507

,0508

a

gta

J

ST-S444ES

ST-S444ES

SECTION

2

DISASSEMBLY

PANEL

ASSY

DISPLAY

BOARD

CASE

REMOVAL

Remove

four

case

screws.

+BVTT3

x

6

(6

pes)

BVTT3

x

6

(2

pes)

BOTTOM

PLATE

Remove

screws

at

both

top

and

bottom

sides.

TERMINAL

BOARD

jack

plate

+BVTP3

x

8,

tapping

BVTTS3

x

6

(7

pes)

Tuner

board

can

be

checked

by

removing

the

bottom

plate.

SECTION

3

ADJUSTMENTS

FM

SECTION

Setting:

Band:

FM

1

CAL

TONE

Level

Adjustment

Setting:

VTVM

(dc

range)

button.

OV

reading

on

VOM.

OUTPUT

should

be

made.

Procedure:

1.

Press

CAL

TONE

switch.

RT603

2.

Adjust

RT603

for

—6dB

(0.39V)

reading

on

VTVM.

STANDARD

SIGNALS

FOR

ADJUSTMENT:

FM

rf

Monaural

Signal

Carrier

frequency:

98MHz

Modulation:

400Hz,

75kHz

deviation

(100%)

US,

Canadian,

E

Model

FM

rf

Stereo

Signal

Carrier

frequency:

98MHz

Modulation:

Audio

400Hz,

33.75kHz

deviation

(45%)

Subchannel

33.75kHz

deviation

(45%)

Pilot

19kHz

7,5kHz

deviation

(10%)

AEP,

UK

Model

FM

rf

Stereo

Signal

FM

rf

Monaural

Signal

Carrier

frequency:

98MHz

Carrier

frequency:

98MHz

Modulation:

Audio

400Hz

Modulation:

400Hz,

40kHz

deviation

(100%)

16.25kHz

deviation

(40%)

Subchannel

16.25kHz

deviation

(40%)

Pilot

19kHz

7,5kHz

deviation

(19%)

Discriminator

Adjustment

A)

Primary

Side

(NULL)

@

Procedure

VOM

{dc

range)

@

Procedure:

-Detune

the

set

by

pushing

the

TUNING

(+,

—)

Turn

the

core

(secondary

side:

Red)

of

IFT102

for

3.

Turn

the

core

(primary

side:

Black)

of

IFT103

for

Note:

Repeat

both

secondary

and

primary

sides

adjustments

Note:

When

the

ceramic

filter

is

replaced,

these

adjustments

ST-S444ES

ST-S444ES

Muting

Width

Adjustment

Setting:

MUTING/MODE

switch:

ON

B)

Secondary

Side

(DISTORTION)

IF

BAND:

WIDE

MODE:

MONO

FM

rf

signal

distortion

generator

meter

Procedure:

FM

rf

signal

generator

VTVM

o.o1uF

LL

aS

page

SR

lL

set

|

j

test

point

SS

4

1

FM

ANTENNA

terminal

OUTPUT

FM

rf

Monaural

signal

FM

ANTENNA

ouTPUT

pee

rmina

R145

Output

level:

1mV

(60dB)

terminal

(752)

Carrier

frequency:

Q98MHz

(US,

Canadian)

+40

—

+65kHz

*(AEP,

G-AEP,

UK,

E)

+25

—+40kHz

ImV

(60dB)

minimum

distortion

reading

on

the

distortion

meter.

Output

level:

.

Receive

98MHz

signal.

2.

With

a

carrier

frequency

of

98MHz

'+40

to.

+6

5kHz

+

adjust

IFT101

so

that

output

signal

is

os

—

-

several

times.

Confirm

minimum

distortion

for

NARROW

IF

BAND.

IFT101

IFT102

.

When

necessary,

repeat

above

steps

so

that

output

signal

is

obtained

at

same

frequency

detuning

point

to

both

plus

and

minus

directions

within

10kHz.

FM

Muting

Level

Adjustment

Setting:

IF

BAND:

WIDE

FM

rf

signal

generator

oscilloscope

FM

ANTENNA

terminal

OUTPUT

(75Q)

FM

rf

Monaural

signal

Output

level:

12.6uV

(220B)

Procedure:

1.

Mode:

MUTING

ON

2.

Tune

the

set

to

98MHz

by

pressing

the

TUNING

button

(+,

—)

and

adjust

the

output

level

of

signal

generator

at

22dB

(12.6uV).

3.

Turn

RT101

(WIDE)

at

the

position

where

the

waveform

suddenly

appears

on

the

oscilloscope.

4,

Mode:

MUTING

OFF

5.

Turn

RT102

(NARROW)

at

the

position

where

the

waveform

suddenly

appears

on

the

oscillo-

scope.

test

point

Gate

Voltage

Adjustment

VTVM

(dc

range)

Adjust

RT601

so

that

gate

voltage

of

Q601

is

1.8V

(+0.1V)

at

87.5MHz.