Sony ST-V702 User manual

SERVIC

PRINTED

WIRI

Page

10

on

S

PARTS

LIST

e

Items

marked

‘x’

they

are

seldom

service.

Some

delay

should

be

antici-

hay

:

differe

E

MANUAL

The

model

is

almost

the

same

as

the

model

ST-V502

previously

produced.

Therefore,

see

the

ST-V502

service

manual

for

the

information

not

contained

in

this

service

manual.

AEP

Model

UK

Model

NG

BOARDS

SCHEMATIC

DIAGRAM

T-V502

Service

Manual

Page

12

on

ST-V502

Service

Manual

nt

portion

—_-

:

different

portion

MS0760-14tP

SIRCS

CONTROL

GND

SYSTEM

[i]

CONTROL

2

CN702

i

°,

ara

’

are

not

stocked

since

«

WG:

West

Germany

model

required

for

routine

.

a

IT:

Italian

model

pated

when

ordering

these

items.

Page

on

ST

~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

14

15

|

*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,

17

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

3P

(SYSTEM

CONTROL

2)

cn7oz2]|

-——

|

*1-565-561-11

|

PIN,

CONNECTOR

3P

(AU

BUS)

cngo1|

*1-569-625-11

|

*1-569-625-41

|

SOCKET,

CONNECTOR

3P

(SYSTEM

CONTROL

1)

FM

STEREO/FM-AM

TUNER

SONY.

English

Sony

Corporation

90E1652-1

Audio

Group

Printed

in

Japan

Published

by

Customer

Relations

and

Service

Group

SERVICE

MANUAL

sony

This

set

is

FM

stereo/FM-AM

Tuner

section

in

LBT-V502/V502CD/

V502CDG.

SPECIFICATIONS

Tuner

System

FM

tuner

section

Tuning

range

Antenna

Intermediate

frequency

MW/LW

tuner

section

Tuning

range

Antenna

Intermediate

frequency

Power

requirements

Power

consumption

AC

outlet

Weight

Dimensions

FM

stereo

FM/AM

superheterodyne

tuner

87.5

to

108

MHz

75

ohms

unbalanced

10.7

MHz

MW:

522

to

1,611kHz

(Italian

model)

531

to

1,602kHz

(other

models)

LW:

144

to

288kHz

(Italian

model)

153

to

279kHz

(other

models)

AM

loop

antenna

External

antenna

terminai

450

kHz

240V

AC,

50Hz

(UK

model)

220V

AC,

50Hz

(other

modeis)

10W

2

switched,

total

500

W

max.

Approx.

2.4

kg

Approx.

355

80

X

312mm

(w/h/d,

including

projections)

AEP

Model

UK

Model

SAFETY-RELATED

COMPONENT

WARNING!!

COMPONENTS

IDENTIFIED

BY

MARK

A

OR

DOTTED

‘LINE

WITH

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

PUB-

LISHED

BY

SONY.

FM

STEREO/FM-AM

TUNER

SONY.

ST-

V502

|

SECTION

1

SERVICING

NOTES

Note

on

Ceramic

Filter

(CF1,2,3)

A

Replacement.

This

set

employs

three

ceramic

filters

(CF1,2,3)

&

which

should

have

the

same

color

marking

to

identify

their

center

frequency.

Therefore

FM

IF

offset

adjustment

by

*

D609,

*

D610

is

necessary

to

match

the

center

frequency

of

the

.

ceramic

filters

used

with

FM

intermediate

frequency.

color

marking

(CF1,2,3)

&

MODEL

IDENTIFICATION

—

Specification

Label

—

SONY:

FM

STEREO/FM

—

AM

TIMER

TUNER

MMM

MODEL

NO,

ST-V502

SERIAL

NO.

MADE

IN

JAPAN

LOCATION

OF

CONTROLS

©:

Mounted

a

oe,

Mounted

FM

intermediate

frequency

(MHz)

Color}

Center

fre-

Bisney

(MDS

*

D609

|

*

D610

FM

intermediate

frequency

is

determined

by

the

three

types

as

shown

above,

Ceramic

filters

of

same

center

fre-

quency,i.e.,

of

same

color

coding

should

be

used

for

CF1,

CF2,

and

CF3.

When

replacing

the

ceramic

filters,

perform

the

FM

Di-

scriminator

Adjustment.

A:

AEP,

UK

Model:

CFI,

2

WG,

IT

Model:

CF1,

2,

3

AEP,

West

Germany,

Italian

Model:

AC:

220V

~

50/60

Hz

UK

Model:

AC:

240V

~

50/60

Hz

Display

window

Buttons

for

setting

the

clock

and

timer

SYSTEM

POWER

switch

8

Remote

sensor

SLEEP

button

[3]

[

6

|

FREQUENCY/TIME

button

Buttons

for

storing

station

frequencies

TUNING

buttons

[9

]

BAND

selector

MEMORY

SCAN

button

AUTO

tuning

button

Signal

of

System

Control

Connector

CNJ901

SYSTEM

CONTROL

1

@

|

ST-

V502

CNJ701

SYSTEM

CONTROL

2

@

SECTION

2

ELECTRICAL

ADJUSTMENTS

FM

DISCRIMINATOR

ADJUSTMENT

Setting:

FM

rf

signal

generator

set

C——>

9

FM

750

terminals

Carrier

frequency

:

98MHz

Modulation

:

IkHz,

40kHz

deviation

(100%)

Output

level

:

ImV

(60dB)

NULL

Terminal

o_O

0

|

{

|

Procedure

:

1.

Tune

the

set

to

98MHz.

2.

Adjust

T21

for

0V

reading

on

the

VOM.

Note:

FM

tuning

level

adjustment

should

be

made

after

FM

discriminator

alignment.

FM

TUNING

LEVEL

ADJUSTMENT

Setting

:

FM

rf

stereo

signal

generator

FM75Q

terminals

Carrier

frequency:

.

98MHz

Modulation

:

LkHz,

40kHz

deviation

(100%)

Output

level

:

17.8uV

(25dB)

Procedure:

1.

Tune

the

set

to

98MHz.

2.

Adjust

RV24

so

that

the

TUNED

LED

goes

on.

FM

STEREO

SEPARATION

ADJUSTMENT

Procedure:

FM

rf

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

|

si

3

shee

ie

ies

ent

hat

the

LAYO

gnal

g

ree

reading

(dB)

.

Se

oop

antenna

so

that

the

UT-FREE

antenna

output

channel

input

level

becomes

2.5mV/m

(68dB).

2.

Tune

the

set

to

216kHz.

3.

Adjust

the

RV22

so

that

the

TUNED

LED

goes

on.

ee

RV21

for

Adjustment

Location

:

minimum

—tuner

board—

ml

reading.

O

Adjust

RV21

for

minimum

FEI

reading.

L-CH

Stereo

separation:

®-®

R-CH

Stereo

separation:

©-D

The

separations

of

both

channels

should

be

equal.

TP1

FM

DISCRIMINATOR

MW/LW

SECTION

A

ADJUSTMENT

IC21

(?)

AM

TUNING

LEVEL

ADJUSTMENT

C}

:

BAND

select

switch:

LW

RV24

wares

FM

TUNING

peting:

LEVEL

ADJUSTMENT

loop

antenna

Ss)

(Sy)

AM

ff

signal

RV22

generator

LAYOUT-FREE

AM

TUNING

antenna

LEVEL

ADJUSTMENT

qe

7

set

\

721

RV21

:

FM

DISCRIMINATOR

—

FM

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-

2L

UZP-6.8B

DTC114ES

18$120

10E2N

2SA1317-

STU

2SC2603-

EF

yee

rer

28C2669-

OY

7

28C3113-A

2$C3330-

STU

2S8C3402

GP1U52XB

ST-V502

ST-

V502

3-3.

TUNER

SECTION

PRINTED

WIRING

BOARD

3-2.

IC

BLOCK

DIAGRAMS

A)

iis

me

op

Ons

IC21

LA1851N

m

ol

cm

'

roa

+

VN

NMOWOODWIOADOUCOOQOODUGAR

<M

P292900

*

io

La

aR

i

F

E

F

D

E

C-

C

B

A

C

C81

LC7218

|

PHASE

"a

SWALLOW

2

BIT

DETECTOR

y

CHARGE

COUNTER

PROGRAMMABLE

PUMP

W/16,

1/1?

BIT

a

DIVIDER

SHIFT

REGISTER

UNIVERSAL

LATCH

COUNTER

ee

By

z

Dp

g

=i

of

SJ

z

on

ox

cos

s

¥

de

|

prilsqe

!

eal

eo

-

REF

a

<3)

1C701

LA5667

CONTROL

@

Note

on

Schematie

Digmam

@®

*D609.

*D610:

See

page

2

for

Note

on

Ceramic

Filter

e

(7:

adjustment

for

repair.

REG

(CF1,2,3)

&

Replacement.

e

Voltage

and

waveforms

are

de

with

respect

to

ground

;

:

ignal

(detuned)

conditions.

@

All

capacitors

are

in

wF

unless

otherwise

noted.

pF:

uuF

BAG

Reee

:

SOWV

or

less

are

not

indicated

except

for

electrolytics

no

mark

-

FM

and

tantalums.

(

)

.AM

e

Note

on

Printed

Wiring

Board

®

All

resistors

are

in

2

and

Y,W

or

less

unless

otherwise

‘

2a

EN

@

Voltages

are

taken

with

a

VOM

(Input

impedance

10M).

®

oO—

:

parts

extracted

from

the

component

side.

specified.

es

e

Ms:

parts

mounted

on

the

conductor

side.

e

—

;

internal

component.

Voltage

variations

may

be

noted

due

to

normal

produc-

@

=f

&

indicates

side

identified

with

part

number.

e

ter

-

nonflammabie

resistor.

tion

tolerances.

©

WG:

West

Germany

model

e

EES

:

B+

Line

@

Signal

path.

©iT:

Italian

model

e

E@

-

B-Line

o>

:FM

eWG:

West

Germany

modei

elT

:

Italian

model

ST-

V502

3-4.

TUNER

SECTION

SCHEMATIC

DIAGRAM

1

2

3

4

5

6

7

ST-

V502

C21

LA1858N

FM

DET,

MPX

AM

IF,

DET

10

{TUNER

BOARD]

A

Fel

FM

FRONT-END

oy

scree

)

FM

IF

AMP

g3

2sca669

|

FM

IF

AMP

AEP,UK

FM:1.9

~

7.6V

5

EP.

UK

i]

{

O

6

OOOO

:

Se

()

Ch

*

1

RV24

:

‘

sf

aE

EES

#

|

er

:

3

—

Be

—

o

SOAMIBL

WG,1T:3.6

7

2

8

,

B

E

»

AM

Hi

“Rist

a

Bd

884

c3

ees

WG,

IT

‘MODEL

AEP,UK

MODEL

ee

AEP:

47

WG,

IT:

22

eel

R64

22k

C65

66

963,

LWSWITCH

2.3

™

a8

=

3

vol

28C3402

o°

632

ray

Lae

MW

29,

63)

bate

100k

ee

SWITCH

1

60

113.5)

MW

BLOCK

C67

0.

0018

C68

0.0015

L61

220%H

R73

seseo2

DT

BAND

SWITCH

D6!

GMAOi

hae]

Nu

a

~,

<&

G6!

28

2803402

MW

SWITCH

LW:1.5-6,3¥

———

FM-AFC

AM-RF-IN

UK,AEP:

100P

WG,1T:680P

Q81,

82

FM

B+

SWITCH

Qe

2SA1348

Oe

283402

er

ee

en.

C62

0.022

2a

a

™~

Rn

&

MWSL3-7.2V———

R109

4.7K

G

a

ls

#

z

a

fs

.

om

ni

is

16

4

~

o

TO

w

B

3

C102

a

0.1

5

CH

G83

2SK246

GRI\

|

p_e

985

25K246

2)

LPe

64

28C3112A

86

2SC3112A

3.8Vp-p

|

139nsec

CGNs

a

i

tc

aaAo

=

ln ld

>

ae

Oe

Dw

a

Ww—-

+10

wy

11

12

13

14

RV22

AM

TUNING

RY22

a

C37

c39

22k

5

10

0.41

SOY

R3S

47k

46

0.4.

FT|

15

a21

28C3330

o

)

PRE

AMP

é

@22

28C3330

=z

2

R29

10K

0.47

5OV

c31

C32

0.1

SOV

\f-BUFF

x

a

oN

rN

93

R37

R38

100k

220k

AEP

,UK

:

2.2K

WG,

IT

:4.7K

STEREO

SEPARATION

WG,

IT

MODEL

CNJ&

CH

GND

@

8)

—

oe

=

CH

TO

POWER

BOARD

TO

CONNECTOR

BOARD

line

with

mark

are

critical

for

safety.

Note:

The

Rea

Ge

Gite

by

mark

A

or

dotted

Replace

only

with

part

number

specified.

ST-V502

ST-

V502

3-5.

CONTROL

AND

POWER

SUPPLY

SECTION

PRINTED

WIRING

BOARDS

eee

he

ee

(PANEL

BOARD)

MO?

TUNER

fay¥

BOARD

BEN

EE

ee

Sak

ate

a

CNP8O!

;

|

Ce

Me,

‘

RN

ORL

?

|

:

|

Eero

4

“Yismrnnnnnbdebl

i

/

|

[CONNECTOR

BOARD)

1

|

ea

'

/

mn

Ay

l

|

14

age

|

TO

TUNER

|

CNu80!

CNu802

|

BOARD

|

P,

©

Semiconductor

Location

!

|

Ref.

No.

|

Location

|

L

3]

RCH

|

t

WARADQOOOWDWOTDUAANUN

SYSTEM.

fa

TO

TUNER

CONTROL

|

l

BOARD

PPSPBDVDWDDOWOD

|

cNvaor

|

!

|

A

|

C-

CNY802

|

.

:

|

E-12

H-12

ba

0

ure

500W

|

AC

OUTLET

|

-9

[iene

eee

4

UK

MODEL

1

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ond

ch

coh

!

~J

!

ak

ok

=O0ONNO

OC

H

E

Fe

F

B

H

F

Ne

Op

ee

el

SYSTEM

CONTROL

2

Note:

e@

oO——:

parts

extracted

from

the

component

side.

e

@

=

=:

parts

mounted

on

the

conductor

side.

@

{

t&

indicates

side

identified

with

part

number.

17

OQ

x

ak

eh

ek nk

th

ed

®WG:

West

Germany

model

@IT:

Italian

model

A

3-6.

CONTROL

AND

POWER

SUPPLY

SECTION

SCHEMATIC

DIAGRAM

®

See

page

6

for

Notes.

1

ON

OFF

[ONCE

DAILY/““SLEER”

I

77

sf

Tels

aan

cs

AUTO”

IMUT

ING

eal

7

r

“|

[TUNED

|

'

(MEMORY

|

ISTERED!

|

PRESET

|

=—4

|

L-——5j

HaHa

AL

|

piMHz

WL

|

=

medal.

0602

-604,

USIO6OM

+

a

$1

DA

>

88>~V

$1

(8G)

(76)

610

&

($12)

D603

s

M

£9

0

TP602

R620

10k

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ge

FS

ao

Yo

R619

10k

Gy

©

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~

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CONTROLLER/FL

DRIVE

TEST

ise)

oO

Mw

Cc

Sl

CE

R618

10k

Oj

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OUT

AUB

IN

MUTING

OUT

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COUNT

NG

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1S

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HIRHSRHOD-CSHID

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—_—

N N

oa

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=

2

ST-V502

D605,

609,610

0612-618

USIO60M

ST-

V502

R6HI

10k

R610

10K

R609

10x

IT

MODEL

4)

fs

Bee

ae

Pe as

ae

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D60S

$601

$602

$603

$604

$605

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ro

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fo

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D613

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ot

11

p>}

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o

[A

SHIFT]

————--—_—_{¢]

{4}

—{TUNING}—{=]

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=

sos.

SI

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Sony ST-V702 User manual

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