Sony Trinitron KV-27TS20 Manuel utilisateur

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ERVICE

MANUAL

Note:

The

service

manual

for

RM-757

has

been

issued

separately.

Television

system

Channel

coverage

Picture

tube

Input

Output

Power

requirements

Power

consumption

Dimensions

Weight

Sound

output

MICROFILM

US

Model

Chassis

No.

SCC-AO5P-A

Canadian

Model

Chassis

No.

SCC-A50G-A

MODELS

OF

THE

SAME

SERIES

SPECIFICATIONS

American

TV

standards

VHF:

2-13

UHF:

14-69

Cable

TV:

1-125

Microblack

Trinitron

tube

27-inch

picture

measured

diagonally

28-inch

picture

tube

measured

diagonally

VIDEO

INPUT

(phono

jacks)

Video:

1

Vp-p,

75-ohms

unbalanced,

sync

negative

Audio:

500

mVrms

(100%

modulation)

Impedance:

47

kilohms

AUDIO

OUTPUT

(VARIABLE)

(phono

jacks)

More

than

408

mVrms

at

the

maximum

volume

setting

(variable)

(100%

modulation)

Impedance:

10

kilohms

120

V

AC,

60

Hz

160W

(max.)

5W

(in

standby

condition)

Approx.

672

x

650

x

524.5

mm

(w/h/d)

49Kg

3W

x

3W

(music

power)

KV-27TS20

Accessories

supplied

Remote

Commander

RM-757

with

2

size

AA

batteries

Antenna

connector

Optional

accessories

U/V

mixer

EAC-66

Connecting

cord

VMC-810S/820S

RK-C74/150

Design

and

specifications

subject

to

change

without

notice.

TRINITRON..COLOR

TV

SONY.

5ILGY

KV-27TS20

RM-757

Section

Title

Page

1.

GENERAL

1-1,

Location

of

Contorls...............00.

4

122¢

Timeér/

Block.

03

sechag

gal

6g

elite

d

gait,

bbe

ea wc

4

1-3.

Presetting

TV

Channels

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

6

1-4.

Watching

TV

Programs

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

T

2.

DISASSEMBLY

2-1.

Rear

Cover

Removal

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

8

2-2.

A

Board

Removal....................

8

2-3.

Service

Position

.................004.

9

2-4.

Picture

Tube

Removal

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

10

2-5.

Removal

of

Anode

Cap

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

10

3.

SET-UP

ADJUSTMENTS

3-1.

Beam

Landing

...................0..

1]

3-2.

Convergence

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

00000004

12

3-3.

Focus

Adjustment

................000.

14

3-4.

White

Balance

..................0...

14

4.

SAFETY

RELATED

ADJUSTMENT

......

15

TABLE

OF

CONTENTS

WARNING

!!

AN

ISOLATION

TRANSFORMER

SHOULD

BE

USED

DURING

ANY

SERVICE

TO

AVOID

POSSIBLE

SHOCK

HAZARD,

BECAUSE

OF

LIVE

CHASSIS.

THE

CHASSIS

OF

THIS

RECEIVER

IS

DIRECTLY

CON-

NECTED

TO

THE

AC

POWER

LINE.

3

SAFETY-RELATED

COMPONENT

WARNING

!!

COMPONENTS

IDENTIFIED

BY

SHADING

AND

MARK

A

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.

CIRCUIT

ADJUSTMENTS

THAT

ARE

CRITICAL

TO

SAFE

OPERATION

ARE

IDENTIFIED

IN

THIS

MANUAL.

FOLLOW

THESE

PRO-

CEDURES

WHENEVER

CRITICAL

COMPONENTS

ARE

REPLACED

OR

IMPROPER

OPERATION

IS

SUSPECTED.

ATTENTION!

AFIN

D’EVITER

TOUT

RISQUE

D’ELECTROCUTION

PROVENANT

D’UN

CHASSIS

SOUS

TENSION,

UN

TRANSFORMATEUR

D‘ISOLEMENT

DOIT

ETRE

UTILISE

LORS

DE

TOUT

DEPANNAGE.

LE

CHASSIS

DE

CE

RECEPTEUR

EST

DIRECTEMENT

RACCORDE

A

L‘ALIMENTATION

SECTEUR.

ATTENTION

AUX

COMPOSANTS

RELATIFS

A

LA

SECURITE!!

LES

COMPOSANTS

IDENTIFIES

PAR

UNE

TRAME

ET

PAR

UNE

MARQUE

/\

SUR

LES

SCHEMAS

DE

PRINCIPE,

LES

VUES

EXPLOSEES

ET

LES

LISTES

DE

PIECES

SONT

D'UNE

IMPORTANCE

CRITIQUE

POUR

LA

SECURITE

DU

FONCTIONNEMENT.

NE

LES

REM-

PLACER

QUE

PAR

DES

COMPOSANTS

SONY

DONT

LE

NUMERO

DE

PIECE

EST

INDIQUE

DANS

LE

PRESENT

MANUEL

OU

DANS

DES

SUPPLEMENTS

PUBLIES

PAR

SONY.

LES

REGLAGES

DE

CIRCUIT

DONT

L’‘IMPOR-

TANCE

EST

CRITIQUE

POUR

LA

SECURITE

DU

FONCTIONNEMENT

SONT

IDENTIFIES

DANS

LE

PRESENT

MANUEL.

SUIVRE

CES

PROCEDURES

LORS

DE

CHAQUE

REMPLACEMENT

DE

COMPOSANTS

CRITIQUES,

OU

LORSQU’UN

MAUVAIS

FONCTIONNE-

MENT

EST

SUSPECTE.

Section

Title

Page

CIRCUIT

ADJUSTMENTS

S-1.

A

Board

Adjustments

...............4.-

18

DIAGRAMS

6-1.

Block

Diagram

..........2.

020000040

21

6-2.

Circuit

Boards

Location................

26

6-3.

Schematic

Diagram

...............0.00..-

27

64.

Printed

Wiring

Boards

................4.

31

6-5.

Semiconductors

...

2...

0.0.00.

eee

38

EXPLODED

VIEWS

Jal.

-Reat

Cover

ois.

cali

ik

oi

i

ar

le

es

39

F222,

Picture

TUBE

322

cars

¥

tierce

ea

decease

40

ELECTRICAL

PARTS

LIST............

41

KV-27TS20

RM-757

SAFETY

CHECK-OUT

(US

MODEL

ONLY)

After

correcting

the

original

service

problem,

perform

the

following

safety

checks

before

releasing

the

set

to

the

customer:

1.

Check

the

area

of

your

repair

for

unsoldered

or

poorly-soldered

connections.

Check

the

entire

board

surface

for

solder

splashes

and

bridges.

2.

Check

the

interboard

wiring

to

ensure

that

no

wires

are

‘pinched’

or

contact

high-wattage

resistors.

3.

Check

that

all

control

knobs,

shields,

covers,

ground

straps,

and

mounting

hardware

have

been

replaced.

Be

absolutely

certain

that

you

have

replaced

all

the

insulators.

4.

Look

for

unauthorized

replacement

parts,

par-

ticularly

transistors,

that

were

installed

during

a

previous

repair.

Point

them

out

to

the

customer

and

recommend

their

replacement.

5.

Look

for

parts

which,

though

functioning,

show

obvious

signs

of

deterioration.

Point

them

out

to

the

customer

and

recommend

their

replace-

ment.

6.

Check

the

line

cord

for

cracks

and

abrasion.

Recommend

the

replacement

of

any

such

line

cord

to

the

customer.

7.

Check

the

condition

of

the

monopole

antenna

(if

any).

Make

sure

the

end

is

not

broken

off,

and

has

the

plastic

cap

on

it.

Point

out

the

danger

of

impalement

on

a

broken

antenna

to

the

customer,

and

recommend

the

antenna’s

replacement.

8.

Check

the

B+

and

HV

to

see

they

are

at

the

values

specified.

Make

sure

your

instruments

are

accurate;

be

suspicious

of

your

HV

meter

if

sets

always

have

low

HV.

9.

Check

the

antenna

terminals,

metal

trim,

“metallized”

knobs,

screws,

and

all

other

exposed

metal

parts

for

AC

leakage.

Check

leakage

as

described

below.

To

Exposed

Metal

Parts

on

Set

|

AC

0.15

uF

315

kQ

voltmeter

(0.75

V)

=

Earth

Ground

Fa

A.

Using

an

AC

voltmeter

to

check

AC

leakage.

LEAKAGE

TEST

The

AC

leakage

from

any

exposed

meta!

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

microampers).

Leakage

current

can

be

measured

by

any

one

of

three

methods.

1.

A

commercial

leakage

tester,

such

as

the

Simpson

229

or

RCA

WT-540A.

Follow

the

manufacturers’

instructions

to

use

these

instru-

ments.

2.

<A

battery-operated

AC

milliammeter.

The

Data

Precision

245

digital

multimeter

is

suitable

for

this

job.

3.

Measuring

the

voltage

drop

acfoss

a

resistor

by

means

of

a

VOM

or

battery-operated

AC

volt-

meter.

The

“‘limit”

indication

is

0.75V,

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

suitable.

(See

Fig.

A)

HOW

TO

FIND

A

GOOD

EARTH

GROUND

A

cold-water

pipe

is

guaranteed

earth

ground;

the

cover-plate

retaining

screw

on

most

AC

outlet

boxesis

also

at

earth

ground.

If

the

retaining

screw

is

to

be

used

as

your

earth-ground,

verify

that

it

is

at

ground

by

measuring

the

resistance

between

it

and

a

cold-

water

pipe

with

an

ohmmeter.

The

reading

should

be

zero

ohms.

If

a

cold-water

pipe

is

not

accessible,

connect

a

60-100

watts

trouble

light

(not

a

neon

lamp)

between

the

hot

side

of

the

receptacle

and

the

retaining

screw.

Try

both

slots,

if

necessary,

to

locate

the

hot

side

of

the

line,

the

lamp

should

light

at

normal

brilliance

if

the

screw

is

at

ground

potential.

(See

Fig.

B)

Trouble

Light

%

Ohmmeter

-

AC

Outlet

Box

—

aks

Cold-water

Pipe

Fig.

B.

Checking

for

earth

ground.

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KV-27TS20

RM-757

SECTION

2

DISASSEMBLY

2-1.

REAR

COVER

REMOVAL

Note:

/ncase

a

REAR

COVER

HOLDER

is

broken,

secure

the

REAR

COVER

using

a

cross-head

BVTP4

x

16

screw.

@)

four

screws

(BVTP4

x

16)

@

rear

cover

@)

one

screw

(BVTP4

x

16)

2-2.

A

BOARD

REMOVAL

(4)

A

board

@)

two

special

screws

(+PW

4

x30}

A

(2)

ANT

terminal

@

Remove

the

claws

at

the

bottom

of

the

ANT

terminal

board.

—

g—

KV-27TS20

RM-757

2:3.

SERVICE

POSITION

@)

two

special

screws

(tPW

4

x

30)

@)

ANT

terminal

KV-27

—

w

N

(>)

2

=

~~

a “

2-4.

PICTURE

TUBE

REMOVAL

@)

Remove

the

six

claws

of

the

BEZEL.

To

remove

each

claw,

insert

the

screwdriver

%

in

the

arrow

direction

indicated

in

the

figure.

a

GQ)

eight

special

screws

rad

2-5.

REMOVAL

OF

ANODE

CAP

¢

REMOVAL

OF

ANODE-CAP

¢

REMOVING

PROCEDURES

|

f

Anode

button

@

Turn

up

one

side

of

the

rubber

cap

in

the

@

Using

a

thumb

pull

up

the

rubber

cap

@

When

one

side

of

the

rubber

cap

is

direction

indicated

by

the

arrow

@.

firmly

in

the

direction

indicated

by

the

separated

from

the

anode

button,

the

arrow

©).

anode-cap

can

be

removed

by

turning

up

the

rubber

cap

and

pulling

up

it

in

the

direction

of

the

arrow

©.

*

HOW

TO

HANDLE

AN

ANODE-CAP

@

Don't

hurt

the

surface

of

anode-caps

with

sharp

shaped

material

!

@

Don't

press

the

rubber

hardly

not

to

hurt

inside

of

anode-caps

!

A

metal

fitting

called

as

shatter-hook

terminal

is

built

in

the

rubber.

@

Don't

turn

the

foot

of

rubber

over

hardly

!

The

shatter-hook

terminal

will

stick

out

or

hurt

the

rubber.

selicaiated

cS

sy

3