Sony STR-S255 User manual

SERVICE

MANUAL

SPECIFICATIONS

Amplifier

section

Continuous

RMS

power

output

60W

+

6O0W

(kHz,

5%

THD,

8

ohms)

Inputs

50

kilohms

50

kilonms

50

kilonms

Outputs

|

SPEAKER

Accepts

speakers

of

8

to

16

ohms

Accepts

headphones

with

low

and

HEADPHONES

high

impedance

Frequency

response

PHONO:

RIAA

curve

+0.5

dB

TUNERI/CD/VIDEO:

10Hz

—

100kHz

+3

dB

|

TT

Tt

|

Baeae

aa

MICROFILM

FM

tuner

section

Frequency

range

87.5

MHz

—

108.0

MHz

Antenna

terminals75

ohms

unbalanced

Intermediate

frequency

10.7

MHz

Sensitivity

at

46

dB

quieting

39.5

dBf,

25

wV

(stereo)

19.5

dBf,

2.5

nV

(mono)

Usable

sensitivity

14.8

dBf,

1.5

uV

(IHF)

Signal-to-noise

ratio

75

dB

(stereo)

80

dB

(mono)

—

Continued

on

page

2

—

FM

STEREO/FM-AM

RECEIVER

SONY.

STR-S255

Harmonic

distortion

TABLE

OF

CONTENTS

0.5%

(stereo)

0.3%

(mono)

at

1

kHz

Section

Title

Separation

40

dB

at

1

kHz

AM

tuner

section

Specifications

Frequency

range

530

-

1610

kHz

(at

10

kHz

step)

531

-

1602

kHz

(at

9

kHz

step)

Function

of

Controls...................

Antenna

AM

loop

antenna

External

antenna

terminal

1.

E

LECTRICAL

ADJUSTMENTS

oe

oan

8

Intermediate

frequency

450

kHz

2.

DIAGRAMS

Usable

sensitivity

AM

loop

antenna:

: .

:

500

yV/m

(1,000

kHz)

2-1.

Tuner

Section

Mounting

Diagram

......

Signal-to-noise

ratio

.

2-2.

Tuner

Section

Schematic

Diagram

......

54

dB

2-3.

Amplifier

Section

Mounting

Diagram

....

Harmonic

sae

2-4.

Amplifier

Section

Schematic

Diagram...

.

ss

0

Pesiete

100W

max.

unswitched

.

PAEODED

MIEMSURNG

Dimensions

Approx.

430

x

225

x

355

mm

(w/h/d)

PARTS

LIST

...................

(17

x

83/4

x

14

inches)

incl.

projecting

parts

and

controls

4.

ELECTRICAL

PARTS

LIST.........

Weight

Approx.

9.2

kg

(20

Ib

5

0z)

net

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

system.

2

Press

the

FM/AM

BAND

selector

to

select

AM.

3

Press

the

POWER

switch

to

turn

off

the

system.

4

While

pressing

the

‘+’

TUNING

button,

press

the

POWER

switch

to

turn

it

on.

To

reset

the

interval

to

10

kHz,

follow

the

same

procedure.

Note

When

the

interval

is

changed,

all

stations

memorized

to

the

10-key

station

preset

selector

will

be

erased.

After

changing

the

interval,

be

sure

to

memorize

the

stations

again.

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.

—2—

STR-S255

SECTION

1

ELECTRICAL

ADJUSTMENTS

FUNCTION

OF

CONTROLS

DEOOOe

ow

Teg

FM

Muting

Level

Adjustment

7

i

FM

rf

signal

generator

FM

ANTENNA

terminal

(FM

75

Q)

Carrier

frequency:

98

MHz

Modulation:

1

kHz,

40

kHz

deviation

Output

level:

17.9

nV

(25

dB)

1.

Push

the

TUNING

(4,

—)

button

for

98

MHz.

2.

Adjust

RV351,

then

check

that

“TUNED”

is

flashed

on

the

indicator.

|

FM/AM

BAND

selector

12]

HEADPHONES

jack

(stereo

phone

jack)

Connect

the

headphones.

The

headphone

volume

can

be

FM

Discriminator

Alignment

(NULL

Check)

[2]

AUTO

TUNING

(FM)

button

adjusted

with

VOLUME.

For

headphone

listening

only,

release

Seiting:

Select

the

automatic

or

manual

tuning

mode.

both

SPEAKERS.

3

_

FM

rf

signal

3]

TUNING

buttons

[13]

SPEAKERS

selectors

generator

Press

to

change

the

frequency.

To

change

the

frequency

continuously,

keep

the

button

depressed.

Select

speaker

system

A

or

B,

or

both.

RV351

14}

5-band

graphic

equalizer

>

STEREO

indicator

Lights

when

an

FM

stereo

program

of

sufficient

signal

strength

is

tuned

in.

aa

MEMORY

button

Memorizes

a

station

on

a

10-key

station

preset

selector.

|

6!

Display

window

~

FUNCTION

indicators

Lights

to

show

the

current

input

source.

FUNCTION

buttons

VIDEO:

For

listening

to

or

recording

the

sound

from

video

equipment

or

auxiliary

programs

(connected

to

VIDEO

inputs).

TAPE:

For

listening

to

a

tape.

CD:

For

listening

to

or

recording

a

compact

disc.

TUNER:

For

listening

to

or

recording

the

radio.

PHONO:

For

listening

to

or

recording

a

phono

record.

|

10-key

station

preset

selector

Used

for

quick

tuning

of

frequently

used

radio

stations.

LS

ENTER

button

Completes

station

preset

selections.

ls

|

=

POWER

switch

(

Slide

downward

or

upward

to

adjust

the

tone.

First

set

all

controls

to

the

center

position

(‘0’),

then

slide

each

control

gradually

until

you

perceive

an

improvement.

When

the

tone

adjustment

using

the

equalizer

is

not

required,

set

the

controls

to

the

center

position.

BALANCE

control

Adjusts

the

balance

of

the

left

and

right

channel

output

level.

VOLUME

control

22.5kHz

frequency

FM

ANTENNA

terminal

Carrier

frequency:

98

MHz

Modulation:

1

kHz,

40

kHz

deviation

Output

level:

1

mV

(60

dB)

IFT351

TP351

VOM

(DC

range)

RV352

AM

Muting

Level

Adjustment

Setting:

BAND

selector

switch:

AM

rf

signal

Procedure:

generator

1.

Push

the

TUNING

(+,

—)

button

for

98

MHz.

Put

the

lead-wire

antenna

close

to

the

set.

2.

Adjust

IFT351

for

0

V

reading

on

the

VOM.

Ceo

30%

amplitude

Carrier

frequency:

999

kHz

modulation

by

Output

level:

0.79

mV

(58

dB)

400

Hz

signal

1.

Push

the

TUNING

(+,

—)

button

for

999

kHz.

2.

Adjust

RV352,

then

check

that

“TUNED”

is

flashed

on

the

indicator.

SECTION

2

STR-S255

@

O—-:

parts

extracted

from

the

component

side.

2-1.

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2-2.

TUNER

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SCHEMATIC

DIAGRAM

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ag

aR

a

Oe

as

Sue

¢

4

Bs

a

at

ee,

1 n

_

3

Shee

=

° °

7

2

bes

2

fs

ae

iv

5

37

5

re)

x

=

os

=

<<

Ga

&

Gat

5

SGC

B

deged

ro)

|

{

CONTROL

ST

BOARD

®

—ot.—

STR-S255

SECTION

3

EXPLODED

VIEWS

AND

PARTS

LIST

NOTE:

Sees

ESS

Sa

ete

Rt

(2)

The

mechanical

parts

with

no

reference

+

The

construction

parts

of

an

assembled

ae

ESERIES

TE

number

in

the

exploded

views

are

not

part

are

indicated

with

a

collation

supplied.

number

in

the

remark

column.

The

components

identified

by

shading

and

mark

are

critical

for

safety.

Replace

only

with

part

number

specified.

-

Items

marked

"

*

"

are

not

stocked

since

they

are

seldom

required

for

routine

service,

Some

delay

should

be

antici-

pated

when

ordering

these

items.

with

VOLUME

The

components

identified

by

shading

and

mark

are

critical

for

safety.

Replace

only

with

part

number

specified.

No.

Part

No.

Description

Remarks

Part

No.

Description

Remarks

MOe.

FAVE

NO.

Description.

BERATED.

|

NOS

PAVE

INGE.

DESEUIBE

ION.

Renate.

51

*4-921-303-01

HEAT

SINK

71

*4-919-705-01

BRACKET

(ST)

52

4-875-726—11

SHEET»

INSULATING

73

*4-911-244-01

CHASSIS,

MAIN

1

X-4919-706-1

PANEL

ASSY

19

4-919-712-41

BUTTON

(1)

53

7-682-649-09

SCREW

+PSW

3X10

75

4-870-539-00

PLATE,

GROUND

2

7-685-646-79

SCREW

+BVTP

3X8

TYPE2

N-S

20

4-919-712-51

BUTTON

(2)

54

*4-911-280-01

BRACKET

(H)

16

4-890-173-00

WASHER

3

*4-919-704-01

BRACKET

21

4-919-712-61

BUTTON

(3)

56

*4-911-239-01

BRACKET,

TRANSFORMER

4

1-685-647-79

SCREW

+BVTP

3X10

TYPE2

N-S

22

4-919-712-71

BUTTON

(4)

*3-561-428-00

5

*4-919-710-01

HOUSE,

LAMP

23.

4=919-712-81

BUTTON

(5)

57

*4-911-238-01

FRAME

ee

6

4-911-230-11

KNOB,

SLIDE

24

4-919-712-91

BUTTON

(6)

58

7-682-148-01

SCREW

+BVTT

3x8

(S)

902

*A-4410-593-A

MOUNTED

PCB,

AMPLIFIER

5

59

*4-919-715-01

CHASSIS.

AMPLIFIER

903

*A-4351-618-A

MOUNTED

PCB,

ST

7

4-911-230-21

KNOB,

SLIDE

25

=

4-919-713-01_

BUTTON

(7)

60

*4-919-701-51

PANEL;

BACK

904

*1-622-505-11

PC

BOARD,

FUNC

8

7-682-148-01

SCREW

+BYTT

3x8

(S)

26

=

4-919-713-11

BUTTON

(8)

61

7-685-646-79

SCREW

+BVTP

3X8

TYPE2

N-S

9

*4-911-283-01

PLATE»

BOTTOM

27.

=

4=919-713-21

BUTTON

(9)

*1-622-506-11

PC

BOARD»

VOL

10

—_

X+4919-703-1

KNOB

(VOL)

ASSY

28

=

4-919-713-31

BUTTON

(0)

62

3-704-242-01

SCREW,

TERMINAL»

+

BYTP

CLAW

*1-622-509-11

PC

BOARD,

HP

11

4-919-714-O1

CASE

29.

+

4-919-713-41

BUTTON

(ENTER)

63

3-703-685-21

SCREW

(+BY

3X8)

*1-622-510-11

PC

BOARD»

SP

12

—

4-886~821-01

SCREW.

M3

CASE

30

*4-919-716-01

HOLDER,

LED

64

3-701-948-18

LABEL.

FUSE

*1-622-683-11

13.

§-919-707-01

PLATE»

LIGHT

GUIDE

31

*4-919-709-01

ILLUMINATOR

a

ae

aee

et

oe

OUA

14

4-919-712-01

BUTTON

(FM/AM)

32

4-861-045-00

LABEL»

CAUTION

15

4-919-713-51

BUTTON

(AUTO/MANUAL

)

33.

*4-919-717-O1

SPACER;

PANEL

67

4=-911-235-01

KNOB»

PUSH

16

4-919-712-21

BUTTON

(-)

34

4-919-711-01

PLATE,

ORNAMENTAL

68

X-4864-303-0

FOOT

ASSY

17

4-919-712-31

BUTTON

(+)

906

*1-622-508-11

PC

BOARD»

CONT

69

*3-703-244-00

BUSHING

(2104),

CORD

18

4-919-703-01

BUTTON

909

*1-622-511-11

PC

BOARD»

GEQ

70

7=682~560-04

SCREW

+BYTT

4X6

(S)

910

*1-622-512-11

PC

BOARD»

LAMP

—1

5—

Sony STR-S255 User manual

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