Sony ST-V702 Manuale utente

SERVIC

PRINTED

WIRI

Page

PARTS

LIST

Items

marked

‘x’

they

are

seldom

service.

Some

delay

should

antici-

hay

differe

MANUAL

The

model

almost

the

same

the

model

ST-V502

previously

produced.

Therefore,

see

the

ST-V502

service

manual

for

the

information

not

contained

this

service

manual.

AEP

Model

BOARDS

SCHEMATIC

DIAGRAM

T-V502

Service

Manual

Page

ST-V502

Service

Manual

portion

—_-

different

portion

MS0760-14tP

SIRCS

CONTROL

GND

SYSTEM

[i]

CONTROL

CN702

°,

ara

’

are

not

stocked

since

WG:

West

Germany

model

required

for

routine

IT:

Italian

model

pated

when

ordering

these

items.

Page

~V502

ST-V502

Part

No.

ST-V702

Part

No.

Description

Service

Manual

X-

4917-

289-1

X-4917-290-1

PANEL

ASSY,

FRONT

*4-934-871-11

*4-934-881-11

(AEP,IT)

--+-PANEL,

BACK

*4-934-871-21

*4-934-881-21

(UK)

-+---»

PANEL,

BACK

*4-934-871-41

*4-934-881-41

(WG)

--+:--

PANEL,

BACK

4-933-601-01

*4-934-883-01

FOOT

14,

9-955-922-11

*A-4334-501-A

*A-4334-690-A

(AEP)

--:---MOUNTED

PCB,

POWER

902

*A-4334-503-A

*A-4334-697-A

(WG,IT)

----

MOUNTED

PCB,

POWER

*A-4334-822-A

*A-4334-692-A

(UK)

---:-+

MOUNTED

PCB,

POWER

*A-4334-497-A

*A-4334-689-A

(AEP)

--+---

MOUNTED

PCB,

PANEL

903

*A-4334-499-A

*A-4334-696-A

(WG)

-:::+»

MOUNTED

PCB,

PANEL

*A-4334-500-A

*A-4334-698-A

(IT)

--+::+*>*MOUNTED

PCB,

PANEL

*A-4334-821-A

*A-4334-691-A

(UK)

-+---»

MOUNTED

PCB,

PANEL

CN701|

*1-569-625-21

*1-569-625-11

SOCKET,

CONNECTOR

(SYSTEM

CONTROL

cn7oz2]|

-——

*1-565-561-11

PIN,

CONNECTOR

(AU

BUS)

cngo1|

*1-569-625-11

*1-569-625-41

SOCKET,

CONNECTOR

(SYSTEM

CONTROL

STEREO/FM-AM

TUNER

SONY.

English

Sony

Corporation

90E1652-1

Audio

Group

Printed

Japan

Published

Customer

Relations

and

Service

Group

SERVICE

MANUAL

sony

This

set

stereo/FM-AM

Tuner

section

LBT-V502/V502CD/

V502CDG.

SPECIFICATIONS

Tuner

System

tuner

section

Tuning

range

Antenna

Intermediate

frequency

MW/LW

tuner

section

Tuning

range

Antenna

Intermediate

frequency

Power

requirements

Power

consumption

outlet

Weight

Dimensions

stereo

FM/AM

superheterodyne

tuner

87.5

108

MHz

ohms

unbalanced

10.7

MHz

MW:

522

1,611kHz

(Italian

model)

531

1,602kHz

(other

models)

LW:

144

288kHz

(Italian

model)

153

279kHz

(other

models)

loop

antenna

External

antenna

terminai

450

kHz

240V

AC,

50Hz

(UK

model)

220V

AC,

50Hz

(other

modeis)

10W

switched,

total

500

max.

Approx.

2.4

Approx.

355

312mm

(w/h/d,

including

projections)

AEP

Model

SAFETY-RELATED

COMPONENT

WARNING!!

COMPONENTS

IDENTIFIED

MARK

DOTTED

‘LINE

WITH

MARK

THE

SCHEMATIC

DIAGRAMS

AND

THE

PARTS

LIST

ARE

CRITICAL

SAFE

OPERATION.

REPLACE

THESE

COMPONENTS

WITH

SONY

PARTS

WHOSE

PART

NUMBERS

APPEAR

SHOWN

THIS

MANUAL

SUPPLEMENTS

PUB-

LISHED

SONY.

STEREO/FM-AM

TUNER

SONY.

ST-

V502

SECTION

SERVICING

NOTES

Note

Ceramic

Filter

(CF1,2,3)

Replacement.

This

set

employs

three

ceramic

filters

(CF1,2,3)

which

should

have

the

same

color

marking

identify

their

center

frequency.

Therefore

offset

adjustment

D609,

D610

necessary

match

the

center

frequency

the

ceramic

filters

used

with

intermediate

frequency.

color

marking

(CF1,2,3)

MODEL

IDENTIFICATION

—

Specification

Label

—

SONY:

STEREO/FM

—

TIMER

TUNER

MMM

MODEL

NO,

ST-V502

SERIAL

NO.

MADE

JAPAN

LOCATION

CONTROLS

©:

Mounted

oe,

Mounted

intermediate

frequency

(MHz)

Color}

Center

fre-

Bisney

(MDS

D609

D610

intermediate

frequency

determined

the

three

types

shown

above,

Ceramic

filters

same

center

fre-

quency,i.e.,

same

color

coding

should

used

for

CF1,

CF2,

and

CF3.

When

replacing

the

ceramic

filters,

perform

the

Di-

scriminator

Adjustment.

AEP,

Model:

CFI,

WG,

Model:

CF1,

AEP,

West

Germany,

Italian

Model:

AC:

220V

50/60

Model:

AC:

240V

50/60

Display

window

Buttons

for

setting

the

clock

and

timer

SYSTEM

POWER

switch

Remote

sensor

SLEEP

button

[3]

[

FREQUENCY/TIME

button

Buttons

for

storing

station

frequencies

TUNING

buttons

]

BAND

selector

MEMORY

SCAN

button

AUTO

tuning

button

Signal

System

Control

Connector

CNJ901

SYSTEM

CONTROL

ST-

V502

CNJ701

SYSTEM

CONTROL

SECTION

ELECTRICAL

ADJUSTMENTS

DISCRIMINATOR

ADJUSTMENT

Setting:

signal

generator

set

C——>

750

terminals

Carrier

frequency

98MHz

Modulation

IkHz,

40kHz

deviation

(100%)

Output

level

ImV

(60dB)

NULL

Terminal

o_O

{

Procedure

Tune

the

set

98MHz.

Adjust

T21

for

reading

the

VOM.

Note:

tuning

level

adjustment

should

made

after

discriminator

alignment.

TUNING

LEVEL

ADJUSTMENT

Setting

stereo

signal

generator

FM75Q

terminals

Carrier

frequency:

98MHz

Modulation

LkHz,

40kHz

deviation

(100%)

Output

level

17.8uV

(25dB)

Procedure:

Tune

the

set

98MHz.

Adjust

RV24

that

the

TUNED

LED

goes

on.

STEREO

SEPARATION

ADJUSTMENT

Procedure:

stereo

Signal

generator

VTVM

FM75Q

OUTPUT

terminals

CNJ702@

L-CH

Carrier

frequency

98MHz

R-CH

Output

level

ImV

(60dB)

Modulation

Audio

400Hz

16.25kHz

deviation

Sub

channel

38kHz

Pilot

signal

19kHz:

16.25kHz

deviation

7.5kHz

deviation

ST-V502

shee

ies

ent

hat

the

LAYO

gnal

ree

reading

(dB)

oop

antenna

that

the

UT-FREE

antenna

output

channel

input

level

becomes

2.5mV/m

(68dB).

Tune

the

set

216kHz.

Adjust

the

RV22

that

the

TUNED

LED

goes

on.

RV21

for

Adjustment

Location

minimum

—tuner

board—

reading.

Adjust

RV21

for

minimum

FEI

reading.

L-CH

Stereo

separation:

®-®

R-CH

Stereo

separation:

©-D

The

separations

both

channels

should

equal.

TP1

DISCRIMINATOR

MW/LW

SECTION

ADJUSTMENT

IC21

(?)

TUNING

LEVEL

ADJUSTMENT

BAND

select

switch:

RV24

wares

TUNING

peting:

LEVEL

ADJUSTMENT

loop

antenna

Ss)

(Sy)

signal

RV22

generator

LAYOUT-FREE

TUNING

antenna

LEVEL

ADJUSTMENT

set

721

RV21

DISCRIMINATOR

—

STEREO

Carrier

frequency

216kHz

ADJUSTMENT

SEPARATION

Modulation

400Hz,

30%

modulation

ADJUSTMENT

3-1.

SEMICONDUCTOR

LEAD

LAYOUTS

LA5667

2SK246-

GR3

2SB1116A-L

DTA144ES

2SC2785-

HFE

HZS27-

UZP-6.8B

DTC114ES

18$120

10E2N

2SA1317-

STU

2SC2603-

yee

rer

28C2669-

28C3113-A

2$C3330-

STU

2S8C3402

GP1U52XB

ST-V502

ST-

V502

3-3.

TUNER

SECTION

PRINTED

WIRING

BOARD

3-2.

BLOCK

DIAGRAMS

iis

Ons

IC21

LA1851N

roa

NMOWOODWIOADOUCOOQOODUGAR

P292900

C-

C81

LC7218

PHASE

SWALLOW

BIT

DETECTOR

CHARGE

COUNTER

PROGRAMMABLE

PUMP

W/16,

1/1?

BIT

DIVIDER

SHIFT

UNIVERSAL

LATCH

COUNTER

cos

prilsqe

eal

REF

<3)

1C701

LA5667

CONTROL

Note

Schematie

Digmam

@®

*D609.

*D610:

See

page

for

Note

Ceramic

Filter

(7:

adjustment

for

repair.

REG

(CF1,2,3)

Replacement.

Voltage

and

waveforms

are

with

respect

ground

;

ignal

(detuned)

conditions.

All

capacitors

are

unless

otherwise

noted.

pF:

uuF

BAG

Reee

SOWV

less

are

not

indicated

except

for

electrolytics

mark

and

tantalums.

(

)

.AM

Note

Printed

Wiring

Board

All

resistors

are

and

Y,W

less

unless

otherwise

‘

Voltages

are

taken

with

VOM

(Input

impedance

10M).

oO—

parts

extracted

from

the

component

side.

specified.

Ms:

parts

mounted

the

conductor

side.

—

;

internal

component.

Voltage

variations

may

noted

due

normal

produc-

indicates

side

identified

with

part

number.

ter

nonflammabie

resistor.

tion

tolerances.

WG:

West

Germany

model

EES

B+

Line

Signal

path.

©iT:

Italian

model

B-Line

:FM

eWG:

West

Germany

modei

elT

Italian

model

ST-

V502

3-4.

TUNER

SECTION

SCHEMATIC

DIAGRAM

ST-

V502

C21

LA1858N

DET,

MPX

IF,

DET

{TUNER

BOARD]

Fel

FRONT-END

scree

)

AMP

2sca669

AMP

AEP,UK

FM:1.9

7.6V

EP.

{

OOOO

()

RV24

‘

EES

—

SOAMIBL

WG,1T:3.6

“Rist

884

ees

WG,

‘MODEL

AEP,UK

MODEL

AEP:

WG,

IT:

eel

R64

22k

C65

963,

LWSWITCH

2.3

™

vol

28C3402

o°

632

ray

Lae

29,

63)

bate

100k

SWITCH

113.5)

BLOCK

C67

0018

C68

0.0015

L61

220%H

R73

seseo2

BAND

SWITCH

D6!

GMAOi

hae]

G6!

2803402

SWITCH

LW:1.5-6,3¥

———

FM-AFC

AM-RF-IN

UK,AEP:

100P

WG,1T:680P

Q81,

B+

SWITCH

2SA1348

283402

en.

C62

0.022

™~

MWSL3-7.2V———

R109

4.7K

C102

0.1

G83

2SK246

GRI\

p_e

985

25K246

LPe

28C3112A

2SC3112A

3.8Vp-p

139nsec

CGNs

aaAo

ln ld

Ww—-

+10

RV22

TUNING

RY22

C37

c39

22k

0.41

SOY

R3S

47k

0.4.

FT|

a21

28C3330

)

PRE

AMP

@22

28C3330

R29

10K

0.47

5OV

c31

C32

0.1

SOV

\f-BUFF

R37

R38

100k

220k

AEP

,UK

2.2K

WG,

:4.7K

STEREO

SEPARATION

WG,

MODEL

CNJ&

GND

—

POWER

BOARD

CONNECTOR

BOARD

line

with

mark

are

critical

for

safety.

Note:

The

Rea

Gite

mark

dotted

Replace

only

with

part

number

specified.

ST-V502

ST-

V502

3-5.

CONTROL

AND

POWER

SUPPLY

SECTION

PRINTED

WIRING

BOARDS

eee

(PANEL

BOARD)

MO?

TUNER

fay¥

BOARD

BEN

Sak

ate

CNP8O!

;

Me,

‘

ORL

Eero

“Yismrnnnnnbdebl

[CONNECTOR

BOARD)

age

TUNER

CNu80!

CNu802

BOARD

Semiconductor

Location

Ref.

No.

Location

RCH

WARADQOOOWDWOTDUAANUN

SYSTEM.

TUNER

CONTROL

BOARD

PPSPBDVDWDDOWOD

cNvaor

C-

CNY802

E-12

H-12

ure

500W

OUTLET

-9

[iene

eee

MODEL

eek

ond

coh

=O0ONNO

SYSTEM

CONTROL

Note:

oO——:

parts

extracted

from

the

component

side.

parts

mounted

the

conductor

side.

{

indicates

side

identified

with

part

number.

ek nk

®WG:

West

Germany

model

@IT:

Italian

model

3-6.

CONTROL

AND

POWER

SUPPLY

SECTION

SCHEMATIC

DIAGRAM

See

page

for

Notes.

OFF

[ONCE

DAILY/““SLEER”

Tels

aan

AUTO”

IMUT

ING

eal

“|

[TUNED

(MEMORY

ISTERED!

PRESET

=—4

L-——5j

HaHa

piMHz

medal.

0602

-604,

USIO6OM

88>~V

(8G)

(76)

610

($12)

D603

£9

TP602

R620

10k

R619

10k

TMP47C870N

4661

CONTROLLER/FL

DRIVE

TEST

ise)

R618

10k

AUB

OUT

AUB

MUTING

OUT

COUNT

1%)

[S]

LS]

1s)12|ls

ZS]

]

}4))

2}/s]/2//

Pree

pene

HIRHSRHOD-CSHID

= N

°o

—_—

N N

ST-V502

D605,

609,610

0612-618

USIO60M

ST-

V502

R6HI

10k

R610

10K

R609

10x

MODEL

Bee

Pe as

D60S

$601

$602

$603

$604

$605

D612

ees

~—F

NO-

1O—

(6)

3606

$607

3608

soo9

s610

D613

la ag T>

p>}

SHIFT]

————--—_—_{¢]

{4}

—{TUNING}—{=]

$611

sos.

’ -

D6t4

BAND

MENORY

{MEMORY

SCAN]

AUTO

$616

S617

$618

$619

D615

[oes

oem

com

19-———_

o—_--—

‘eee

DAILY

TIME

{=]

*D609

3620

=P?

3621

3622

$623

3626

eed

D616

reek

SLEEP

CONTROL

BACK

0610

625

$626

sear

sexe

$629

ao-4

D617

ames

o—#

~o—

(oot

pot

MODE

TP60i

$630

$631

3632

D618

Mat)

come

aca

fe)

P23

P2i

R62

R63

P10

©)

®)

R606

10k

R604

100k

R605

10k

—<P19

Pi2

R607

10%

R608

10K

)

P13

Pll

)

end

[P13

[eI

SIRCS

OUT

RELAY

OUT

]

IC601

1C60!

GP1US2

RECEIVER

3.6V

——

0.8V

238ysec

4.3V

0.4v

238

psec

[$1

94.95

22/2

cneon2

2/213

o;a

luo

eiz

uwi|>

tuner

Board

SYSTEM

CONTROL

0601

USIO6OM

(c)

2802603

Peg

Sy ti

LAS667

POWER

CONTROL

13.54

als

9801

2SBI

116A

ers

B+

SWITCH

R804

4.7%

R80S

Q802

HOLD

-a

(1?)

AUB

OUT

RELAY

log

2scsao2

BUFFER

D70

etna

usi0C0M

AUB

fled

GND

SYSTEM

CONTROL

CN701

C705

C704

~L701

0.01

G10

SOV

D100u

R710

R709 R708

10k

10k 10k

MS0760-141P

SIRCS

CONTROL

Had

ab&é

CNJ8O1

CNU802

SWITCHED

5Q0W

MAX

OUTLET

CNP801

CN804

ST-V502

3-7.

FRONT-END

(FE1)

SCHEMATIC

DIAGRAMS

(West

Germany,

Italian

Model)

)

(AEP,

Model)

C03

Do!

RO!

R014

ROB

C020

Lh,

OUT

colr

cor

003

cols

LOS

TROS

co19

REED

—

TRATED

—13—

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