Sony STR-V 25 User manual

US

Model

Canadian

Model

Photo

:

US

model

FM

STEREO

/FM-AM

RECEIVER

SPECIFICATIONS

GENERAL

System:

Superheterodyne

FM/AM

tuner

Dimensions:

US

model;

Approx.

430

(w)

x

135

(h)

x

380

(d)

mm

Equalizer

amp

section:

IC

op-amp,

NF

type

16

'%

(w)

x

5

3%

(h)

x

14

%

(d)

inches

Tone

amp

section:

IC

op-amp,

NF

type

Power

amp

section:

Pure-complementary

dc

amp

Power

Requirements:

120

V

ac,

60

Hz

Power

Consumption:

US

model;

80

W

Canadian

model;

120

W

AC

Outlets:

Switched

100

W

Unswitched

300

W

SAFETY-RELATED

COMPONENT

WARNING!!

COMPONENTS

IDENTIFIED

BY

SHADING

AND

MARK

AN

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.

ATTENTION

AU

COMPOSANT

AYANT

RAPPORT

A

LA

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.

Canadian

model;

Approx.

460

(w)

x

135

(h)

x

380

(d)

mm

18

(w)

x

5%

(h)

x

14%

(d)

inches

including

projecting

parts

and

controls

Weight:

US

model;

Approx.

7.7

kg,

17

Ibs

(net)

Approx.

8.8

kg,

19

Ibs

3

0z

{in

shipping

carton)

Canadian

model;

Approx.

8.5

kg,

18

Ibs

12

oz

(net)

Approx.

9.6

kg,

21

Ibs

3

oz

(in

shipping

carton)

AMPLIFIER

SECTION

Power

Output

and

With

8

Q

loads,

both

channels

driven,

from

Total

Harmonic

20

—

20,000

Hz;

rated

28

W

per

channel

Distortion:

—=

minimum

RMS

power,

with

no

more

than

0.04

%

total

harmonic

distortion

from

250

mW

to

rated

output.

—

Continued

on

page

2

—

SERVICE

MANUAL

wee

STR-V25

Damping

Factor:

Dynamic

Headroom:

Intermodulation

(1M)

Distortion:

(60Hz:

7kHz=4:

1)

Residual

Noise:

40

at

1

kHz,8

2

1.5

dB

Less

than

0.04

%

at

rated

output

Less

than

0.2

mV

at

8

2

Inputs:

|

Sensitivity

Impedance

S/N

WED

pHoNo

|

Eyam)

|

SOK

|

Segue]

A

TAPE

1.2

|

(Tees

|

SK?

|

goaer|

4

eux

|

cree

|

52%

|

ove]

|

Measured

with

rated

output

power

into

8

2

loads

(both

channels

driven

simultaneously)

at

1

kHz

*'78

JHE

Outputs

(with

rated

input):

REC

OUT

1,2

[Voltage

150

mV

(—14.5

dB),

Impedance

10

k2Q

HEADPHONES

|

Accepts

low

impedance

headphones.

SPEAKER

A,

B

8

—

16

Q

speakers

are

suitable.

Measured

with

rated

input,

FM

30

%

modulation

Frequency

Response:

Tone

Controls:

Loudness

Control:

(att.

30dB)

FM

TUNER

SECTION

Tuning

Range:

Antenna

Terminals:

Intermediate

Frequency:

PHONO:

RIAA

equalization

curve

+

0.5

dB

AUX,

TAPE

1,2:

5Hz—~—

70

kHz

a

dB

BASS

+

10

dB

at

50

Hz

TREBLE

+

10

cB

at

20

kHz

+10

dB

at

50

Hz

+3

dB

at

10

kHz

87.5

—

108

MHz

300

2

balanced

75

Q

unbalanced

10.7

MHz

Sensitivity

at

50dB

Quieting:

Usabte

Sensitivity:

Signal-to-noise

Ratio:

Harmonic

Distortion:

Separation:

Frequency

Response:

Selectivity:

Capture

Ratio:

AM

Suppression

Ratio:

Image

Response

Ratio:

IF

Response

Ratio:

Spurious

Response

Ratio:

RF

intermodulation:

Sub-carrier

Product

Ratio:

Muting

Threshold:

AM

TUNER

SECTION

Tuning

Range:

Antenna:

Intermediate:

Frequency:

Usable

Sensitivity:

Signal-to-noise

Ratio:

Harmonic

Distortion:

Selectivity:

16.1

dBf,

3.5

wV

(mono)

36.1

dBf,

35

uV

(stereo)

10.3

dBf,

IHF

1.8uV

75

dB

(mono)

70

dB

(stereo)

at

100

Hz

0.15

%

(mono),

0.2

%

(stereo)

at

1

kHz

0.1

%

(mono),

0.15

%

(stereo)

at

6

kHz

0.15

%

(mono),

0.2

%

(stereo)

40

dB

at

100

Hz

45

dB

at

1

kHz

35

dB

at

10

kHz

30

Hz—15

kHz+1

dB

60

dB

at

400

kHz

1.5

dB

50

dB

45

dB

90

dB

75

dB

65

dB

40

dB

Approx.

18

nV,

25

dBf

530

kHz

—

1,610

kHz

Built-in

ferrite-rod

antenna,

External

antenna

terminal

450

kHz

300

nV

/m,

ferrite-rod

antenna

100

vV,

external

antenna

at

1,000

kHz

50

dB

at

50

mV/m

0.5

%

at

50

mV/m,

400

Hz

35

dB

at

10

kHz

MODEL

IDENTIFICATION

—

Specification

Label

—

US

model:

Canadian

model:

FM

STEREO

/

FM—AM_

RECEIVER

MODEL

NO.

STR—V25

FREQ

RANGE:

FM

87.5-108MHz

AM530-1610

KHz

iF

:FM

10.7MHz

AM

450

KHz

SERIAL

NO.

AC

120V_

60Hz

AC

120V_

60Hz

80w

720W

STR-V25

SECTION

1

OUTLINE

901'S0L0

1010

a

HO-1

SV

AWS

:

HO-4

ee

L934

YOLV1N93uy

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=

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334

wv

D)——

2

i-L06S

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CAGOW

NVIOYNY916020

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(234v!]

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id

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1nd

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901

-

bOL8

4

330

dWV

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Ww]

440

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:

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13A31

‘Wwnais

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VOIGNI

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AENENTS

)

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20801

1g

ape

ONILAW

W4

Bed

»\

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ee

re

{3d0W

ea0ss

bo

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Ww

D—AO——

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ae

a

Sere

a

EeaRE

93,

1

€

a

H-¥

|

@

|

a

i

|

:

49

108

91

4

[208

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|

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1080

»

19

@

1d

oy

[woe

dWv

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W4

dW

31

WS

j

[207K

wa

dW

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W4

(3)

|

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USL

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=

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aoa

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[wnnainv]

STR-V25

SECTION

2

DISASSEMBLY

2-1.

REMOVAL

Note:

Follow

the

disassembly

procedure

in

the

numerical

order

given.

TOP

COVER

top

cover

top

cover

screw

left

side

board

ass’y

: :

-

(Canadian

model)

A

iia

sipaihr

a

”

FRONT

PANEL

O

BVTT3x6

front

panel

assy

@

BVTT3

x6

BOTTOM

PLATE

PTPWH3

x

6

@

P

O

PTPWH3

x

6

@

PTPWH3

x

6

4

Photo

:

US

model

STR-V25

2-2,

DIAL

CORD

STRINGING

1.

Preparation

9-911-825-32

Cord,

dial;

0.3mm

dia

g

/

\

whe

/

ti

Crimp

the

eyelet

and

then

apply

gh

locking

compound.

ws

:

‘1394mm___

-

»)

(55

inches)

[i

=

OMT:

——_—_

4h

5

—6mm

.

2.

Stringing

1).

Turn

the

tuning

capacitor

shaft

fully

clockwise,

and

set

the

dial

drum

to

the

position

as

illustrated.

2).

Follow

the

stringing

procedure

in

the

numerical

order

given.

°

®

Receive

a

broadcasting-station

signal

and

set

the

dial

pointer

to

the

frequency

of

the

station

on

the

dial

scale.

®

After

stringing,

(7)

String

below

apply

suitable

ee

the

dial

pointer

guide.

locking

compound.

o>

=

sh

Lr

ee

,

\

°

7

~~

o

7

:

vs

|

dial

pointer

@

two

and

half

ZA

BS.

‘iki

ass

oS

turns

>

Z

ara

:

4

~/

VU

>

Ry

ea

5)

—=

i

§

aS

@

String

below

SQ

(4)

three

turns

the

lead

wires.

dial

drum

|@

one

turn}

r

——@

E

°

@

Hook

the

spring

to

the

boss.

®

ete

eceae

half

turns

O

(inch)

STR-V25

SECTION

3

ELECTRICAL

ADJUSTMENTS

TUNER

SECTION

|

FM

Discriminator

Alignment

1

Setting:

MODE

switch:

MONO

VOM

frange:

2.5

V

de}

Procedure:

di

Detune

the

set.

2,

Adjust

the

red

core

(primary-side)

of

IFT801

for

0

V

dc

reading

on

VOM.

17

/C8071

Dio

9

Note:

Repeat

the

secondary-side

and

primary-

side

adjustments

several

times.

—c-

R832

0807

—"°&

ca02

lFT80O1

(primary-side

:

red)

tuner

board

IFT807

(secondary-side

:

black)

FM

Discriminator

Alignment

2

Setting:

MODE

switch:

MONO

FM

rf

signal

distortion

generator

meter

FM

antenna

REC

OUT

Carrier

frequency:

98MHz

terminal

Output

level:

1

mV

(60

d8)

Modulation:

400

Hz,

75

kHz

deviation

(100

%)

Procedure:

Adjust

the

black

core

(secondary

side)

of

IFT801

for

minimum

distortion.

STR-V25

Signal

Indicator

Level

Adjustment

Setup:

MODE

switch:

FREQUENCY

COVERAGE

ADJUSTMENT,

TRACKING

ADJUSTMENT

and

IF

ALIGNMENT

VCO

Adjustment

MONO

A)

Regular

Method

The

front-end

section

has

been

carefully

FM

rf

adjusted

at

the

factory,

so

the

adjustment

is

signal

unnecessary

in

the

field.

generator

Setting:

FRONT-END

SECTION

MODE

switch:

:

Procedure:

FM

rf

signal

FM

antenna

generator

terminal

Carrier

frequency:

98MHz

Modulation:

400

Hz,

75kHz

deviation

(100%)

Output

level:

1mV

(60

dB)

Procedure:

Tune

the

set

to

98

MHz

and

adjust

RT802

so

that

all

signal

elements

light

up.

(See

figure

below.)

—

co

=

ae

green

lamp

lights

up

5

4

2

3

4

FM

antenna

terminal

Carrier

frequency:

98MHz

Modulation:

400

Hz,

75

kHz

deviation

(100%)

1mV

(60

dB)

Output

level:

4

FM

Muting

Level

Adjustment

Setting:

MODE

switch:

STEREO

MUTING

switch:

ON

Procedure:

FM

rf

signal

VOM

generator

fac

range)

tuner

board

frequency

counter

1.

2.

Adjust

RT101

for

76

kHz

+

100

Hz

on

the

counter.

Tune

the

set

to

98

MHz.

FM

Stereo

Separation

Adjustment

FM

stereo

signal

generator

output

channel

L-CH

(A)

Adjust

RT102

for

minimum

reading

VTVM

connection

VTVM

Setting:

reading

(dB)

MODE

switch:

STEREO

MUTING

switch:

ON

FM

antenna

REC

OUT

terminal

B)

Simple

Method

Carrier

frequency:

98MHz

Modulation:

400

Hz,

75

kHz

deviation

(100%)

10

wV

(20

dB)

Procedure:

1.

Tune

the

set

to

the

FM

stereo

broadcasting

signal.

Output

level:

Procedure:

1.

Tune

the

set

to

98

MHz.

2.

Turn

RT801

and

stop

it

just

when

the

VOM

indication

suddenly

decreases.

2.

Turn

RT101

clockwise

or

counterclockwise

and

memorize

the

lighting-up

range

of

the

stereo

lamp.

FM

rf

stereo

Signal

ma

generator

©

©)

Adjust

RT102

for

minimum

reading.

3.

Receive

a

signal

stronger

than

the

muting

level.

Confirm

that

the

ACUTE

SERVO

LOCK

lamp

(green)

lights

up.

(See

figure

below.)

3.

Secure

RT101

at

the

center

of

the

lighting-up

0.01

HF

range

of

both

turns

as

shown

below.

center

of

lighting-up

ranges

FM

antenna

terminal

REC

OUT

lighting-up

range

L-CH

Stereo

separation:

(A)

—

R-CH

Stereo

separation:

©

—

The

separations

of

both

channels

should

be

equal.

ry

LOCKED

ACUTE

SERVO

LOCK

Carrier

frequency:

98

MHz

Output

level:

1

mV

(60

dB}

Modulation:

Audio

(400

Hz}:

33.75

kHz

deviation

(45%)

Pilot

(19kHz):

7.5kHz

deviation

(10%)

The

green

lamp

at

the

center

lights

up.

=7—

—8—

AUDIO

SECTION

Note

1.

DC

bias

and

DC

balance

adjustments

should

be

performed

about

five

minutes

later

after

the

POWER

switch

is

turned

ON.

DC

Balance

Adjustment

(with

no

signal

input)

VOM

{de

range)

SPEAKER

L-CH

(R-CH)

RT652

(R-CH)

RT602

(L-CH)

US

model

RT651

RT601

(R-CH)

(L-CH)

DC

Bias

Adjustment

(with

no

signal

input)

—

L-CH

—

Adjust

RT601

for

20mV

dc

reading

on

VOM.

+

=

VOM

(de

range)

re

TI

power

amp

board

STR-V25

2.

Repeat

DC

bias

and

DC

balance

adjustments

two

or

three

times.

Adjust

RT602

(L-CH)

and

RT652

(R-CH)

for

OV

dc

reading

on

VOM.

RT602

(L-CH)

RT652

(R-CH)

Canadian

model

—

R-CH

—

Adjust

RT651

for

20mV

dc

reading

on

VOM.

VOM

aa

(de

range)

+

Rey

,

For

Note

on

Schematic

Diagram:

@

All

capacitors

are

in

uF

unless

otherwise

noted.

pF

:

pur

SOWV

or

less

are

not

indicated

except

for

electrolytics

and

tantalum.

@

All

resistors

are

in

ohms,

%W

unless

otherwise

noted,

kQ

:

10002,

MQ

:

1000k2

°

f+

:

nonflammable

resistor,

e

A:

internal

component.

e

[7]

:

panel

designation.

e@

(~~)

:

adjustment

for

repair.

e

:

B+

bus.

e@

==

—e=:

B—

bus,

®

Voltages

are

de

with

respect

to

ground

unless

otherwise

noted,

®

Readings

are

taken

under

with

a

VOM

(20kQ/V),

no

mark:

{

FM

section

(FM

stereo}

’

{AM

section

(detuned)

(

}

:

FM

(detuned)

@

Voltage

variations

may

be

noted

due

to

normal

pro-

Cc

duction

tolerances.

@

Switch

Ref.

No.

|

Switch

Position

§301-5,

6

MUTING

OFF

$501-1

to

3

|

PHONO

ON

$502-1

to

4

|

FM

OFF

$503-1

to

4

|

AM

OFF

$504-1

to

3

|}

AUX

OFF

$505-1

to

4

|

TAPE

1

OFF

S506-1

to

4

|

TAPE

2

OFF

$507-1

to

4

|

TAPE

COPY 1—=2

OFF

$508-1,

2

MODE

STEREO

$509-1,2

LOUDNESS

OFF

|

$901-1

to

3

|

POWER/SPEAKERS

POWER

OFF

Qa

a

—~10—

2d.

pF

:

wuF

electrolytics

‘wise

noted.

‘ss

Otherwise

™).

normal

pro-

tion

{+

OFF

Replacement

Semiconductors

For

replacement,

use

semiconductors

except

in

(

).

Q101,

103

Q702,

705:

2SK34

(2SK34C)

Q104,

201

202,

609

a659

:

2SC1364

(2SC1815)

:

rae

0612-616

°

SGD

Q803-—807

Q811

Q707:

2SD809

letter

side

0102,

610

|

Q660,

706

|

:

2SA1027R

(2SA1015)

{Ey

a80s—810

i

A

&

Q611,661

:

2SA1049

EC

1€101:

wPC1161C

1C201:

4PC1178C

C801:

uPC1167C

16

151413121110

9

Q601,

651:

2SC2725

12345878

(Top

view)

1

23

af

qT

7

26

1C401,

451:

M5214L

35

3

4

5

63

Q604,

654:

2SC1986D

(2SC1827)

D101—103

|

D601

D603,

604

D651

:

181555

D653

D801,

802

D805,

807

|

Q605,

655:

2SC1914A

|

607,657:

2SA850

Deas

Q606,

656:

2SC1735

D701—706

|

:

10E2

D201:

HZ11B2L

EY

cathode

B

E

BCE

D303-—307

|

D309

|

:

SLP241B

Q701:

2SC1986D

(2SC1826)

D709:

S4VB40

(S4vB)

iS)

co

Ge

I

EBC

STR-V25

Q704:

2SB731

letter

side

Cc

SECTION

4

DIAGRAMS

4-1.

MOUNTING

DIAGRAM

—

Conductor

Side

—

(Canadian

Model

:

Power

Amp

Board)

:

[

POWER

AMP

|

~L2v¥FQB6O

%

REI3

:

eyes

my

1C301:

LB1416

ogolig

=

a4

fy,

i

|

REI,

270

al

1413121110

9

8

602

e709

N

|

reat

100.

if

1234567

|

(Top

view}

|

1C501:

NJM4560D

|

1C802:

uPC4558C

|

8765

|

1234

(Top

view)

|

D707:

EQB01-12Z2

(EQA01-12R)

|

:

D708:

EQB01-05

(EQA01-05R)

|

;

loge

sap

ae

|

ayo

te

Serato

oa

3a

a

:

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ae

eg

OEM

cathode

|

2

murat

xe

=

woe

©

$5

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Ove

>

'

BOY

os

|

3>

D301,

302,

308:

SLP141B

|

vel

fret

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ee

a

|

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Pout

|

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pee

ey

ee

en

eee

>

:

ors

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snesdl

7"

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iow

M

Y

=

CNJSOI

=

UNS

—

23

0

RED

a

D602,

652:

SV04S

e@

[:

indicates

side

identified

with

part

number.

ae

|

3

R901

3.3M(1/2W)

ee

:

B

+

pattern

=

r

©

meaner

©

signal

path

cathode

©

mee

meee:

L-CH

signal

path

©

qemeon

mem

:

R-CH

signal

path

D804,

806:

MV12N

~12—

CHASSIS

GROUND

[

_

CANADIAN

MODEL

STR-V25

Q704:

2SB731

letter

side

.705:

2SK34

(2SK34C)

D

G

Ss

/

SGoD

Q707:

2SD809

letter

side

LY

es

yD

|

‘

cB

E

1C301:

LB1416

1C101:

wPC1161C

1C201:

wPC1178C

1C801:

uPC1167C

14131211109

8

16151413121110

9

1234567

(Top

view}

12345878

(Top

view)

1C501:

NJM4560D

1C802:

uPC4558C

C401,

451:

MS214L

8765

1234

(Top

view)

D707:

EQB01-12Z

(EQA01-12R)

D708:

EQB01-05

(EQA01-05R)

D101—103

;

D601

D603,

604

D651

D653

D801,

802

D805,

807

D605

j

D701—706

{

D201:

HZ11B2L

cathode

181555

10E2

D301,

302,

308:

SLP141B

303-307

|

»

SLP241B

D602,

652:

SVO04S

309

|

cathode

anode

>t

D804,

806:

MV12N

‘709:

S4VB40

(S4VB)

cathode

a

1

i

34

t

4

anode

11-

STR-V25

SECTION

4

DIAGRAMS

‘

STR-V25

4-1.

MOUNTING

DIAGRAM

—

Conductor

Side

—

(Canadian

Model

:

Power

Amp

Board)

RIS

1200,

gol

Id

\

R610,

,,

270

v

os

615-5

200

lev

33V

3

R665

reg

200P

0655

9983

ape

208

R660,.270

270p..

B3V

E

2k}

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ve

G59

2k

i247

RSE

yA

sary

O55,

27

REST

4?

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ig

ra)

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eee

a

oon

i

oe

:

°

R707

1

ee

&

he

Ae

:

nity]

;

:

33

8103

peg

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aA

F701

2.58

A

|

BLY...

|

r-

<3,6

<3>—

—~<3>—

a

23>—

23

|

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fret

SS

PT9O!

|

(W)

POWER

i

|

P30

L_

(DIAL

POINTER)

al

Sg

ee

es

ep

ee

20

ore

CNJ902

¥:

SWITCHED]_____

|

BLK

|

CNU9OI

UNSWITCHED]

——

|

4

300W

MAX

|

3

RED

2

@

[-:

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side

identified

with

part

number.

|

wie

=

R901

3.3M(1/2W)

xa

:

4

=

19

RED_4

CHASSIS

|

GROUND

©

examen

©

signal

path

|

©

meas

meme

:

L-CH

signal

path

|

cP90I

©

meen

seep

:

R-CH

signal

path

|

q

CNP9OI

AC

IN

|

_

CANADIAN

MODEL

—12~

—13—

604,608

658,654

I

"|

603

653

|

602

652

|

655

|

601

651

|

614

|

602

652

|

613,

612

|

601

651

|

615,616

|

STR-V25

4-2.

MOUNTING

DIAGRAM

—

Conductor

Side

—

Cc

©

See

page

11

for

the

replacement

semiconductors.

STR-V25

™!

7

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Fil

BA

300n

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ANT

38kHz

TO

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[VOLUME]

Sony STR-V 25 User manual

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