Sony Trinitron kv-20exr20 User manual

SERVICE

MAN

pcPr0.

B.

Zr

American

TV

standards

VHF:

2-13

UHF:

14

—

69

Cable

TV:

1

—

125

Microblack™

Trinitron*

tube

20-inch

picture

measured

diagonally

21-inch

picture

tube

measured

diagonally

75-ohm

external

antenna

termina!

for

VHF/UHF

VIDEO

1

and

2

IN

§

VIDEO

IN

(4-pin

mini

DIN)

Y¥:

1

Vp-p,

75-ohms

unbalanced,

sync

negative

C:

0.286

Vp-p

(Burst

signal),

75-ohms

Video

(phono

jacks):

+

Vp-p,

75-ohms

unbalanced,

sync

negative

Audio

(phono

jacks):

500

mVrms

{100%

modulation)

Impedance:

47

kilonhms

VIDEO

2

OUT

Video

(phono

jack):

75-ohms

unbalanced,

sync

negative

Audio

(phono

jacks):

{mpedance:

10

kilohms

Television

system

Channel

coverage

Picture

tube

Antenna

tnput

Output

En==

MICROFILM

KV-

20EXR20

RM-Y103

US

Model

Chassis

No.

SCC-D50D-A

Canadian

Model

Chassis

No.

SCC-D61B-A

ANU-2

cuassis

MODELS

OF

THE

SAME

SERIES

KV-20EXR20

KV-20EXR10

|

KV-20EXR15

SPECIFICATIONS

Speaker

output

AUDIO

OUT

(VARIABLE)

(phono

jacks)

More

than

408

mVrms

at

the

maximum

volume

setting

(variable)

Impedance:

5

kilohms

5Wx2

Power

requirements

120

V

AC,

60

Hz

Power

consumption

Max.

Standby

130W

1.5

W

Supplied

accessories

Remote

commander

AM-Y103

with

2

size

AA

(R6)

batteries

(1)

Antenna

connector

(1)

Recommended

accessories

Dimensions

Weight

U/V

mixer

EAC-66

Connecting

cable

VMC-810/820S,

YC-15

V/30

V

Video

rack

SU-275

517.0

X

477.2

X

483.4

mm

(W

X

H

x

D)

25.0

kg

Design

and

specifications

are

subject

to

change

without

notice.

TRINITRON@COLOR

TV

SONY.

KV-20EXR20

TABLE

OF

CONTENTS

RM-Y103

Section

Title

Page

1.

GENERAL

1-1.

Location

Of

Controls

4

1-2.

Presetting

TV

Channels

5

1-3.

Watching

TV

Programs

6

1-4.

Adjusting

Picture

and

Sound

Quality

-------+-++-

t

1-5.

Using

the

Universal

Remote

Commander

--------

9

1-6.

Using

the

Guide

Function

10

2.

DISASSEMBLY

2-1.

Rear

Cover

Removal

---+++rtrscrtsces

tte

rreee

13

2-2.

Ul

and

U2

Boards

Removal

-++++-++rrrrsrteee:

13

2-3.

Service

Position

«ccc

cr

treet

eee

13

2-4.

Picture

Tube

Removal

--+++++s

errr

teeter

cee

14

3.

SET-UP

ADJUSTMENTS

3-1.

Beam

Landing

+++++ssseeerceec

sects

eee

eeees

15

3-2.

Convergence

16

3-3,

Focus

‘«ccccstsr

errr

t

ster

eeeee

sees

18

3-4.

G2.

White

Balance

Adjustments

18

4.

SAFETY

..------

19

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.

SAFETY-RELATED

COMPONENT

WARNING

!!

COMPONENTS

IDENTIFIED

BY

SHADING

ANO

MARK

A

ON

THE

SCHEMATIC

DIAGRAMS,

EXPLODED

VIEWS

ANO

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

IOENTIFIED

IN

THIS

MANUAL.

FOLLOW

THESE

PRO-

CEDURES

WHENEVER

CRITICAL

COMPONENTS

ARE

REPLACED

OR

IMPROPER

OPERATION

IS

SUSPECTED.

Section

Title

Page

5.

CIRCUIT

ADJUSTMENTS

5-1.

Electrical

Adjustment

by

Remove

Commander

---

22

5-2.

Circuit

Adjustment

-++++s+e

reese

reer

eee

e

eres

24

6.

DIAGRAMS

6-1.

Block

Diagram

27

6-2.

Circuit

Boards

Location

31

6-3.

Schematic

Diagrams

and

Printed

Wiring

Boards

—

Conductor

Side

—

vet

ee

rete

e

renee

eeteenees

31

6-4.

Semiiconductorg.

24

Fe

ee

ese

ee

eee

Secs

Kaw

ee

46

7.

EXPLODED

VIEWS

FA.

Chassis

oe

aie

eae

kte

ae

eater

ee

steno

SVE

RS

47

72

Dictate

Tubes

sige

sees

+

sess

aeiesats

pee

eke

48

8.

ELECTRICAL

PARTS

LIST

...--------------

49

ATTENTION!

AFIN

D‘EVITER

TOUT

RISQUE

D’ELECTROCUTION

PROVENANT

D’UN

CHASSIS

SOUS

TENSION,

UN

TRANSFORMATEUR

O'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

OU

FONCTIONNEMENT

SONT

(tDENTIFIES

DANS

LE

PRESENT

MANUEL.

SUIVRE

CES

PROCEDURES

LORS

DE

CHAQUE

REMPLACEMENT

DE

COMPOSANTS

CRITIQUES,

OU

LORSQU’UN

MAUVAIS

FONCTIONNE-

MENT

EST

SUSPECTE.

aa

Gana

eae

es

aero

KV-20EXR20

RM-Y103

SAFETY

CHECK-OUT

(US

Model

only)

After

correcting

the

original

service

problem,

perform

the

following

safety

checks

before

teleasing

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

2

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

voltmeter

lime]

(0.75)

=

Earth

Ground

Fig.

A.

Using

an

AC

voltmeter

to

check

AC

leakage.

LEAKAGE

TEST

The

AC

leakage

from

any

exposed

metal

part

to

earth

ground

and

from

al}

exposed

metal

parts

to

any

exposed

metal

part

having

a

return

to

chassis,

must

not

exceed

0.5mA

(S00

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-S40A.

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

across

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

boxes

is

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

Cold-water

Pipe

Fig.

B.

Checking

for

earth

ground.

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3103Sa1

OF

KV-20EXR20

RM-Y103

SECTION

2

DISASSEMBLY

2-1.

REAR

COVER

REMOVAL

2-2.

U1

AND

U2

BOARDS

REMOVAL

@

REAR

COVER

@)

Remove

U2

Gyan

areas

Board

bracket

®

Remove

U1

(BVTP4

x

16)

Board

bracket

i

7

°0

@®

Remove

U1

Board

@

Remove

claw

to

connector

@

two

screws

(BVTP4

X16)

2-3.

SERVICE

POSITION

@

special

screw

(+PW4

X

30)

KV-20EXR20

RM-Y103

2-4.

PICTURE

TUBE

REMOVAL

©

Band

Ee}

Spring

@

®

Deflection

yoke

Two

tapping

screws

@

Anode

oe

‘

2

*

REMOVAL

OF

ANODE-CAP

+

REMOVING

PROCEDURES

|

“©

@

Turn

up

one

side

of

the

rubber

cap

in

@Using

a

thumb

pull

up

the

rubber

cap

the

direction

indicated

by

the

arrow

@.

firmly

in

the

direction

indicated

by

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

material

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.

Chassis

assy

;

&N

@

Two

special

screws

Ly

Sci

@

Two

tapping

screws

@®

Picture

tube

CUSHION

Anode

button

@

When

one

side

of

the

rubber

cap

is

separated

from

the

anode

button,

the

anode-cap

can

be

removed

by

turning

up

the

rubber

cap

and

pulling

up

it

in

the

direction

of

the

arrow

©.

SECTION

3

KV-20EXR20

RM-Y103

SET-UP

ADJUSTMENTS

i

a

complete

realignment

is

required

or

a

new

picture

tube

is

installed.

@

These

adjustments

should

be

performed

with

rated

power

supply

voltage

unless

otherwise

noted.

The

control

and

switch

below

should

be

set

as

follows

unless

otherwise

noted:

PICTURE

control

-++-+++++---

80%

BRIGHTNESS

control

------

RESET

position

@

The

following

adjustments

should

be

made

when

Perform

the

adjustments

in

order

as

follows:

1.

Beam

Landing

2,

Convergence

3.

Focus

4.

G2,White

Balance

Note:

Test

Equipment

Required.

1.

Color-bar

Pattern

Generator

2.

Degausser

3.

DC

Power

Supply

4.

Digital

multimeter

5.

Audio

OSC

Preparation:

—

@

Set

the

side

of

the

unit

with

the

PICTURE

TUBE

so

that

it

faces

east

or

west

in

order

to

reduce

the

influence

of

external

magnetic

force.

3-1.

BEAM

LANDING

1.

Input

a

raster

signal

with

the

pattern

generator.

_

2.

Loosen

the

deflection

yoke

mounting

screw,

and

set

the

purity

control

to

the

center

as

shown

in

Fig.2.

3.

Turn

the

raster

signal

of

the

pattern

generator

to

green.

4.

Move

the

deflection

yoke

backward,

and

adjust

with

the

purity

control

so

that

green

is

in

the

center

and

red

and

blue

are

at

the

sides

evenly.

(Fig.3)

5.

Move

the

deflection

yoke

forward,

and

adjust

so

that

entire

screen

becomes

green.

(Fig.1)

6.

Switch

over

the

raster

signal

to

red

and

blue

and

confirm

the

condition.

7.

When

the

position

of

the

deflection

yoke

is

determined,

tighten

it

with

the

deflection

yoke

mounting

screw.

8.

When

landing

at

the

corners

is

not

right,

adjust

by

using

the

disk

magnets.

(Fig.4)

purity

control

Fig.

2

Fig.

3

Disk

magnets

or

rotatable

disk

magnets

correct

these

areas

(a-d).

KV-20EXR20

RM-Y103

3-2.

CONVERGENCE

Preparation

©

Before

starting,

perform

FOCUS,

H.SIZE,

V.LIN

and

V.SIZE

adjustments.

Set

BRIGHTNESS

control

to

minimum.

Feed

in

dot

pattern.

(1)

Horizontal

and

Vertical

Static

Convergence

Center

dot

RV701

FOCUS

1,

Adjust

H.STAT

VR

to

converge

red,

green

and

blue

dots

the

in

center

of

the

screen.

(Horizontal

movement)

2.

Adjust

V.STAT

magnet

to

converge

red,

green

and

blue

dots

in

the

center

of

the

screen.

(Vertical

movement)

3.

If

the

red,

green

and

blue dots

do

not

converge

in

the

center

of

the

screen

with

H.STAT

VR,

perform

horizontal

convergence

adjustment

using

H.STAT

VR

and

V.STAT

magnet

as

shown

below.

(In

this

case,

HSTAT

VR

and

V.STAT

magnet

effect

each

other.)

@

Tilt

the

V.STAT

magnet

and

adjust

static

convergence

to

open

or

close

the

V.ISTAT

magnet.

G2(SCREEN)

4.

When

the

V.STAT

magnet

is

moved

in

the

direction

of

arrow

@

and

®,

red,

green

and

blue

dots

move

as

shown

below.

@

0]

®

9

J~0

B

{

8

,

\

If

the

blue

dot

do

not

converge

with

red

and

green

dots,

perform

following

steps.

@

HMC

and

VMC

correction

for

BMC

(Hexapole)

Magnet

1.

HMC

(Horizontal

Mis-convergence)

correction

and

motion

of

the

Electron

Beam

with

the

BMC

Magnet.

HMC

correction

(A)

HMC

correction

(B)

2.

VMC

(Vertical

Mis-convergence)

correction

and

motion

of

the

Electron

Beam

with

the

BMC

Magnet.

VMC

correction

(A)

VMC

correction

(B)

A

nN

A

B

é

B

c<D

c=0

c>o

c=D

R

OR

¢

.

Cc

s

Cl

g

,¢

G

ery

obo

0

B

OB

B 8

a

(2)

Dynamic

Convergence

Adjustment

Perpartion

:

@

Before

starting

perform

Horizontal

and

Vertical

Static

convergence

adjustment.

1.

Slightly

loosen

deflection

yoke

screw.

2.

Remove

deflection

yoke

spacers.

KV-20EXR20

RM-Y103

Purity

V.STAT

magnet

BMC

(Hexapole)

magnet

aw

eee

we

\-7

\.

3.

Move

the

deflection

yoke

for

best

convergence

as

shown

below.

4.

Tighten

the

deflection

yoke

screw.

5.

Install

the

deflection

yoke

spacers.

KV-20EXR20

|

RM-Y103

(3)

Screen-corner

Convergence

a-d:

screen-corner

misconvergence

:

3-3.

FOCUS

1.

Tune

in

an

off-air

signal.

2.

PICTURE

—control

to

80%.

3.

Adjust

the

focus

VR

on

A

board

so

that

the

focus

at

the

center

of

the

screen

is

optimum.

A

magenta

ring

will

appear

if

the

focus

is

adjusted

only

in

the

center

of

the

screen.

Adjust

evenly

throughout

the

entire

screen.

3-4.

G2.

WHITE

BALANCE

ADJUSTMENTS

1.

G2

(SCREEN)

ADJUSTMENT(RV701)

1)

Set

the

PICTURE

and

BRIGHTNESS

to

normal.

2)

Confirm

G1

voltage

is

within

30.0+5V.

3)

Apply

DC

voltage

of

180V

to

the

cathodes

of

R,

G

and

B

from

DC

stabilized

power

source.

4)

While

watching

the

picture,

adjust

the

G2

control

(RV701)

to

the

just

the

retrace

line

disappears.

(Using

the

Remote

Commander)

2.

WHITE

BALANCE

ADJUSTMENT

1)

Set

to

service

mode.

2)

Press

[VIDEO

|

>

[RESET

to

normal

and

if

necessarys

“TRINITRON”

Set

to

“Low”

by

[4or

[=|

.

3)

Input

an

entire

white

signal.

4)

Set

the

PICTURE

to

minimum.

5)

Select

S

BRT

with

[1]

and

[4],

and

then

set

the

level

to

minimum

with

[]and

fl

Affix

a

Permalloy

ass’y

corresponding

to

the

misconverged

areas.

Permalloy

assembly

6)

Select

G

CUT

and

B

CUT

with

[1]and

[4].

And

adjust

the

level

with

[3]

and

[6]

for

the

best

white

balance.

7)

Set

the

PICTURE

to

maximum.

8)

Select

G

AMP

and

B

AMP

with

1

and

4,

and

adjust

the

level

with

[3]

and

[6]

for

the

best

white

balance.

.

SUB

BRIGHT

ADJUSTMENT

1)

Set

to

service

mode.

2)

Input

a

staircase

signal

of

black

and

white

from

the

pattern

generator.

3)

BRIGHTNESS

---

RESET

PICTURE

«::::::-

minimum

4)

Select

S

BRT

with

[1]

and

[4]

,

and

adjust

SUB

BRIGHT

level

with

|3]

and

[6]

so

that

the

stripe

second

from

the

right

is

dimly

lit.

white

second

from

the

right

black

KV-20EXR20

RM-Y103

SECTION

4

SAFETY

Ba

R559

CONFIRMATION

METHOD

(HOLD-DOWN

CONFIRMATION)

AND

READJUSTMENTS

The

following

adjustments

should

always

be

per-

formed

when

replacing

the

following

components

(marked

with

[@

on

the

schematic

diagram).

PM501,Q608,Q607,R629,R628,R627,R559

ro)

1.

Preparation

before

confirmation

1)

Remove

R675

on

the

G

board

and

connect

a

variable

resistor

(RV1:

about

10k

)

between

@

of

1C653

and

B+

line.

2)

Supply

12042.0V

AC

to

with

variable

auto-

transformer.

2.

Hold-down

operation

confirmation

1)

Turn

the

POWER

switch

ON,

and

receive

entire-

ly

white

signals

and

adjust

ABL

current

to

1450

+50uA

with

PICTURE

and

BRIGHT

etc

controls.

2)

Increase

B+

line

voltage

gradually

by

adjusting

the

resistor

of

RV1.

Confirm

that

the

minimum

voltage

is

less

than

152.5V

DC

whereby

the

raster

disappears

during

operation

of

hold-down

circuit.

NOTE:

When

the

hold-down

circuit

starts

operating,

switch

OFF

the

POWER

of

the

set

immediately.

3)

Turn

the

POWER

switch

ON,

and

receive

dot

signals

and

adjust

ABL

current

to

150+20pnA

with

PICTURE

and

BRIGHT

etc

controls.

4)

Increase

B+

line

voltage

gradually

by

adjusting

the

resistor

of

RV1.

Confirm

that

the

minimum

voltage

is

less

than

155.0V

DC

whereby

the

raster

disappears

during

operation

of

hold-down

circuit.

NOTE:

When

the

hold-down

circuit

starts

operating,

switch

OFF

the

POWER

of

the

set

immediately.

3.

Hold-down

readjustment

When

step

2

is

not

satisfied,

readjustment

should

be

performed

by

altering

the

resistance

value

of

R559

(a

component

marked

with

B4).

i

T500

|

FBT

,

i]

'

i]

ammeter

t

'

3.0

mA

de

'

PMSOt

rangs

|

5

J

Ba

R570

CONFIRMATION

METHOD

(HOLD-DOWN

CONFIRMATION)

AND

READJUSTMENTS

The

following

adjustments

should

always

be

per-

formed

when

replacing

the

following.

components

(marked

with

[4

on

the

schematic

diagram).

1C653,PM501,Q608,Q607,D531,C545,C627,R570,R591,

R627,R628,R675,1500

1.

Preparation

before

confirmation

1)

Turn

the

POWER

switch

ON,

and

receive

entire-

ly

white

signals

and

set

the

PICTURE

and

BRIGHT

controls

to

maximum.

2)

Confirm

that

voltage

of

the

check

terminal

of

TP-85

is

more

than

108V

DC

when

the

set

is

operating

normally

with

120.042.0V

AC

supply.

2.

Hold-down

operation

confirmation

1)

Turn

the

POWER

switch

ON,

and

receive

entire-

ly

white

signals

and

adjust

ABL

current

to

1450

+50zA

with

PICTURE

and

BRIGHT

etc

controls.

2)

Apply

DC

voltage

of

over

130V

DC

gradually

to

the

check

terminal

of

TP-85

via

1T40

from

the

DC

stabilized

power

source.

Confirm

that

the

minimum

voltage

is

less

than

136.0V

DC

whereby

the

raster

disappears

during

operation

of

hold-down

circuit.

NOTE:

When

the

hold-down

circuit

starts

operating,

switch

OFF

the

POWER

of

the

set

immediately.

3)

Turn

the

POWER

switch

ON,

and

receive

dot

signals

and

adjust

ABL

current

to

150+20pA

with

PICTURE

and

BRIGHT

etc

controls.

4)

Apply

DC

voltage

of

over

130V

gradually

to

the

check

terminal

of

TP-85

via

1T40

from

the

DC

stabilized

power

source.

.

Confirm

that

the

minimum

voltage

is

less

than

136.0V

DC

whereby

the

raster

disappears

during

operation

of

hold-down

circuit.

NOTE:

When

the

hold-down

circuit

starts

operating,

switch

OFF

the

POWER

of

the

set

immediately.

3.

Hold-down

readjustment

When

step

2

is

not

satisfied,

readjustment

should

be

performed

by

altering

the

resistance

value

of

R570

(a

component

marked

with

Ba).

KV-20EXR20

RM-Y103

B+

VOLTAGE

CONFIRMATION]

The

following

adjustments

should

always

be

perform-

ed

when

replacing

IC653

and

R675.

1)

Supply

130#2V

AC

to

with

variable

auto-trans-

former.

2)

Receive

entirely

monoscope

signal.

3)

Set

the

PICTURE

control

and

the

BRIGHT

controls

in

to

initial

reset.

4)

Confirm

the

voltage

of

TP-91

is

less

than

137.0V

DC.

5)

If

step

4)

is

not

satisfied,

replace

IC653

and

R675

repeat

above

steps.

multimeter

Sony Trinitron KV-20EXR20 User manual

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