Toshiba 2837DD Manuale utente

SERVICE

DATA

FILE

NO.

050-751

PAL-B/G

SYSTEM

TOSHIBA

COLOUR

TELEVISION

2837DD,

2537DD

7037DD

Note:

The

specifications

model

7037DD

are

the

same

those

model

2837DD

which

are

described

below.

SPECIFICATIONS

Input

Power

Rating:

Aerial

Input

Impedance:

Receiving

Channels:

Intermediate

Frequencies:

Picture

Tube:

Sound

Output:

Speakers:

Aux.

Terminals:

Cabinet:

Dimensions:

Weight:

Features:

147

(2837DD),

143

(2537DD),

220

240

ohm

unbalanced

type

for

VHF,

UHF

and

CATV

CCIR

(B/G.PAL)

Broadcast

Standard:

channels

12,

S41

channels

Picture

I-F

carrier

frequency

38.9

MHz

Sound

I-F

carrier

frequency

...

Colour

sub-carrier

frequency

34.47

MHz

inches,

A66ECY

13X31,

660

(measured

diagonal

viewable

picture

area)(2837DD),

inches,

AS9ECY

13X31,

590

(measured

diagonal

viewable

picture

area)(2537DD),

110°

deflection

10.0

(at

10%

Distortion

MAIN),

5.0

(at

10%

Distortion

Dolby)

120

oval

pcs

socket

(FULL),

socket

(S-VIDEO/AUDIO)

S-VIDEO,

VIDEO/AUDIO

INPUT

socket

Table

type

(2837DD)

(2537DD)

516

640

447

(2837DD),

27.5

(2537DD)

Video

input

PAL-B/G,

TELETEXT

reception,

OFF-timer,

German

stereo/bilingual,

Dolby

surround

Specifications

are

subject

change

without

notice.

Printed

Japan

Jul.

1994

SAFETY

INSTRUCTIONS

WARNING:

BEFORE

SERVICING

THIS

CHASSIS,

READ

THE

"X-RAY

RADIATION

PRECAUTION",

"SAFETY

PRECAUTION"

AND

"PRODUCT

SAFETY

NOTICE"

INSTRUCTIONS

BELOW.

X-RAY

RADIATION

PRECAUTION

The

E.H.T.

must

checked

every

time

the

receiver

serviced

ensure

that

the

C.R.T.

does

not

emit

X-ray

radiation

result

excessive

E.H.T.

voltage.

The

nominal

E.H.T.

for

this

receiver

26.5

zero

beam

current

(minimum

brightness)

operating

220V

a.c.

The

maximum

E.H.T.

voltage

permissible

any

operating

circumstances

must

not

exceed

29.0

kV.

When

checking

the

E.H.T.,

use

the

‘High

Voltage

Check’

procedure

this

manual

using

accurate

E.H.T.

voltmeter.

The

only

source

X-RAY

radiation

this

receiver

the

C.R.T.

prevent

X-ray

radiation,

the

replacement

C.R.T.

must

identical

the

original

fitted

specified

the

Parts

List.

Some

components

used

this

receiver

have

safety

characteristics

preventing

the

C.R.T.

from

emitting

X-ray

radiation.

For

continued

safety,

replacement

component

should

only

made

after

referring

the

Product

Safety

Notice below.

SAFETY

PRECAUTION

This

receiver

has

nominal

working

E.H.T.

voltage

24.5

kV.

Extreme

caution

should

exercised

when

working

the

receiver

with

the

back

removed.

not

attempt

service

this

receiver

you

are

not

conversant

with

the

precautions

and

procedures

for

working

high

voltage

equipment.

When

handling

working

the

C.R.T.,

always

discharge

the

anode

the

receiver

chassis

before

removing

the

anode

cap

The

C.R.T.,

broken,

will

violently

expel

glass

fragments.

Use

shatter

proof

goggles

and

take

extreme

care

while

handling.

not

hold

the

C.R.T.

the

neck

this

very

dangerous

practice.

essential

that

maintain

the

safety

the

customer

all

cable

forms

replaced

exactly

supplied

from

factory.

small

part

the

chassis

used

this

receiver

is,

when

operating,

approximately

half

mains

potential

all

times.

therefore

essential

the

interest

safety

that

when

serving

connecting

any

test

equipment

the

receiver

should

supplied

via

suitable

isolating

transformer

adequate

rating.

Replace

blown

fuses

within

the

receiver

with

the

fuse

specified

the

parts

list.

When

replacing

wires

components

terminals

tags,

wind

the

leads

around

the

terminal

before

soldering.

When

replacing

safety

components

identified

the

international

hazard

symbols

the

circuit

diagram

and

parts

list,

must

Toshiba

approved

type

and

must

mounted

the

original.

Keep

wires

away

from

high

temperature

compo-

nents.

PRODUCT

SAFETY

NOTICE

Many

electrical

and

mechanical

components

this

chassis

have

special

safety-related

characteristics,

These

characteristics

are

often

passed

unnoticed

visual

inspection

and

the

X-ray

radiation

protection

afforded

them

cannot

necessarily

obtained

using

replacements

rated

higher

voltages

wattage,

Components

which

have

these

special

safety

characteristics

this

manual

and

its

supplements

are

identified

the

international

hazard

symbols

the

schematic

diagram

and

parts

list.

Before

replacing

any

these

components

read

the

parts

list

this

manual

carefully.

Substitute

replacement

components

which

not

have

the

same

safety

characteristics

specified

the

parts

list

may

create

X-ray

radiation.

etc.

FRONT

CONTROLS

AND

REAR

VIEWS

VIDEO-3:

S-VIDEO

TERMINAL

MAINS

SWITCH

VIDEO-3:

INPUT

SOCKET

POWER

INDICATOR

SELECT

REMOTE

EYE

VOLUME

DOWN

POSITION

VOLUME

POSITION

DOWN

21-pin

SOCKET

(S-VIDEO/AV)

21-pin

SOCKET

(FULL)

HORIZ.

PICTURE

POSITION

AERIAL

TERMINAL

REMOTE

HAND

HELD

UNIT

KEY

ASSIGNMENT

(0)

dseasenied

STAND-BY

;

VTR

STAND-BY)

vreresescees

MUTE

CALL

......

DISPLAY

CALL

Few

eet

FUNCTION

KEY

FOR

VTR

(To

push

double

for

VTR

SERVICE

Operation)

co.

<TV

MODE

---------

TUNING

OTHER

<TEXT

MODE

-----F-T-B

(FULL,

TOP,

BOTTOM)

>”

eens

PICTURE

seeeines

SOUND

OOM

.....

<TV

MODE

«++

STEREO

BILINGUAL

<TEXT

MODE

----

REVEAL

CONCEAL

1~9,0...

TEN KEY

-fee

place

Eb)

VIDEO

INPUT

(EXTERNAL

INPUT

SOURCE

SW.)

eile

VOLUME

iectea:

LEVEL

PLUS

(VOLUME,

MENU)

ecietctas

LEVEL

MINUS

(VOLUME,

MENU)

(POSI.,

CH.,

TEXT

PAGE)

esesees

DOWN

(POSI.,

CH.,

TEXT

PAGE)

TXT/TV.......

TEXT,

MIX,

MODE

SW.

Sas

TIME

DISPLAY

(TV

MODE)

oes

TEXT

CLEAR

(TEXT

MODE)

TEXT

Ghee

INDEX

FLOF

COLOUR

KEY

key

used)

RC)

;

Red

GO:

Green

;

Yellow

;

Cyan

TOSHIBA

push

with

Key

(ly

STAND-BY

[gl

STOP

VTR

440°"

CUE

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CT-9678

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LINDYIO

WARNING:

BEFORE

SERVICING

THIS

CHASSIS,

READ

THE

“X-RAY

RADIATION

PRECAUTION”,

“SAFETY

PRECAUTION”

AND

“PRODUCT

SAFETY

NOTICE”

PAGE

THIS

MANUAL.

INSTALLATION

AND

SERVICE

ADJUSTMENTS

GENERAL

INFORMATIONS

All

adjustments

are

thoroughly

checked

and

corrected

when

the

receiver

leaves

the

factory.

Therefore

the

receiver

should

operate

normally

and

produce

proper

colour

and

B/W

pictures

upon

installation.

However,

several

minor

adjustments

may

required

depending

the

particular

location

which

the

receiver

operated.

This

receiver

shipped

completely

cardboard

carton.

Carefully

draw

out

the

receiver

from

the

carton

and

remove

all

packing

materials.

Plug

the

power

cord

into

convenient

220

volts

two

power

outlet.

Turn

the

receiver

ON.

Check

and

adjust

all

the

customer

controls

such

BRIGHTNESS,

CONTRAST

and

COLOUR

Controls

obtain

natural

colour

B/W

picture.

AUTOMATIC

DEGAUSSING

degaussing

coil

mounted

around

the

picture

tube

that

external

degaussing

after

moving

the

receiver

normally

unnecessary,

providing

the

receiver

properly

degaussed

upon

installation.

The

degaussing

coil

operates

for

about

second

after

the

power

the

receiver

switched

ON.

the

set

moved

faced

different

direction,

the

power

switch

must

switched

off

least

one

hour

order

that

the

automatic

degaussing

circuit

operates

properly.

Should

the

chassis

parts

the

cabinet

become

magnetized

cause

poor

colour

purity,

use

external

degaussing

coil.

Slowly

move

the

degaussing

coil

around

the

faceplate

the

picture

tube,

the

sides

and

front

the

receiver

and

slowly

withdraw

the

coil

distance

about

before

disconnecting

from

source.

colour

shading

still

persists,

perform

the

COLOUR

PURITY

ADJUSTMENT

and

CONVERGENCE

ADJUSTMENTS

procedures.

HIGH

VOLTAGE

CHECK

CAUTION:

There

HIGH

VOLTAGE

ADJUST-

MENT

this

chassis.

Connect

accurate

high

voltage

meter

the

second

anode

the

picture

tube.

Turn

the

receiver.

Set

the

BRIGHTNESS

and

CONTRAST

Controls

minimum

(zero

beam

current).

High

voltage

will

measured

below

29.0

kV.

HEIGHT

ADJUSTMENT

Receive

the

PHILIPS

pattern,

and

set

the

contrast,

colour

and

brightness

centre.

Adjust

HEIGHT

Control

(R351)

that

white

blocks

top

and

bottom

the

picture

are

just

masked.

HORIZONTAL

CENTRE

ADJUSTMENT

Receive

the

PHILIPS

pattern.

Set

the

contrast

and

colour

centre,

and

the

brightness

centre.

Adjust

CENTER

USER

Control

(R452)

the

pattern

centre

can

located

the

screen

centre.

FOCUS

ADJUSTMENT

Adjust

FOCUS

Control

FLYBACK

TRANS.

(1461)

for

well

defined

scanning

lines

the

centre

area

the

screen.

PAL

MATRIX

ADJUSTMENT

Tune

the

colour

programme

the

Philips

pattern.

Set

the

COLOUR

Control

obtain

the

proper

colour.

the

PAL

MATRIX

adjustment

incorrect,

the

Venetian

Blind

would

appear

the

colour

bars

area.

This

case

needs

the

adjustment.

the

first,

adjust

PHASE

ADu.

Coil

(L551)

minimize

the

Venetian

Blind.

adjust

1H-DL

ADJ.

(R551)

minimize

the

Blind.

the

Venetian

Blind

still

remains,

adjust

1H-DL

PHASE

ADJ.

Coil

(L551)

minimize

the

Blind

again.

Repeat

the

item

and

procedures,

adjust

the

R551

and

L551

until

the

Blind

does

not

appear.

CRT

GREY

SCALE

ADJUSTMENT

10.

11.

Nes

Tune

active

channel.

Set

the

SERVICE

SW.

(S202)

the

“H.

LINE”

position.

Turn

the

SCREEN

Control

(on

T7461)

fully

counter-

clockwise.

rotating

the

RED,

GREEN

and

BLUE

CUT

OFF

Controls

(R557,

R558,

R559)

the

mid

position.

Set

the

GREEN

and

BLUE

DRIVE

Controls

(R252,

R253)

the

center.

Rotate

the

SCREEN

Control

gradually

clockwise

until

the

first

line

appears

slightly

the

screen.

Set

the

SCREEN

Control

this

position.

Adjust

the

CUT

OFF

Controls

obtain

the

slightly

lighted

horizontal

lines

the

same

levels

three

colours

(RED,

GREEN

and

BLUE).

The

lines

may

look

white

the

CUT

OFF

Controls

are

adjusted

properly.

Set

the

SERVICE

SW.

(S202)

the

“RECEIVE”

position.

Set

the

CONTRAST

and

COLOUR

Controls

minimum,

and

BRIGHTNESS

Control

the

maximum.

Adjust

the

BLUE

and

GREEN

DRIVE

Controls

(R252/R253)

obtain

proper

white-balanced

picture

high

light

areas.

Set

the

BRIGHTNESS

and

CONTRAST

Controls

obtain

dark

grey

raster.

Then

check

the

white

balance

low

brightness.

the

white

balance

not

proper,

retouch

the

CUT

OFF

Controls

and

DRIVE

Controls

obtain

good

white

balance

both

low

and

high

light

areas.

SUB-BRIGHTNESS

ADJUSTMENT

Tune

ina

colour

programme.

Set

the

CONTRAST

Control

the

minimum

and

the

BRIGHTNESS

Control

the

centre.

Set

the

COLOUR

Control

the

centre.

Set

the

SUB-BRIGHT.

Control

(R255)

the

centre

and

leave

the

receiver

for

five

minutes

this

state.

Watching

the

picture

well,

adjust

the

SUB-BRIGHT.

Control

the

position

where

the

picture:

does

not

show

evidence

blooming

high

bright

area

and

not

appear

too

dark

low

bright

portion.

Check

the

proper

picture

variation

rotating

the

CONTRAST

and

BRIGHTNESS

Controls

both

extremes.

the

picture

does

not

appear

dark

with

the

CONTRAST

and

BRIGHTNESS

Controls

turned

the

minimum,

not

appear

bright

with

the

controls

turned

the

maximum,

adjust

the

SUB-BRIGHT.

Control

again

for

the

acceptable

picture.

HOW

MAKE

THE

CHASSIS

STAND

FOR

REPAIR

THE

2835DB

(Model

)

Remove

the

wire

set

for

the

loud

speaker

from

the

holder.

Remove

the

horn

speaker

unit

(unscrew

the

fixing

screws).

Lift

the

chassis

such

manner

that

stands

against

the

inner

side

surface

the

front

mask.

Using

the

screws

which

have

been

removed

when

disconnecting

the

front

mask

and

the

back

cover,

screw

the

chassis

the

side

the

front

mask.

restore,

perform

the

above

steps

opposite

order.

Upper

hole

the

chassis

frame

for

2835/2837

and

Lower

hole

the

chassis

frame

for

2535/2537

series.

ADJUSTMENT

METHOD

FOR

SERVICING

OUTLINE

Since

each

used

I2C

bus

control

type,

readjustment

the

TVs

also

needs

adjustment

through

12C

bus

control.

the

service

mode,

sub-bright,

deflection

system

sub-

adjustments,

picture

system

sub-adjustments

can

made

easily

with

user

remote

control

unit.

SERVICE

MODE

OPERATION

2-1.

How

Enter

the

Service

Mode

@©+

(simultaneous

push)

key

Service

mode

@key

Service

mode

G)key

key

2-2.

How

Exit

from

the

Service

Mode

Exit

the

service

mode

turning

the

power

on/off

with

the

remote

control.

SUB

DATA

ADDITIONAL

DESCRIPTION

HIT

met

[

ADJUSTMENT

THE

SERVICE

MODE

3-1.

Service

Mode

Level

Adjustments

(1)

Push

()

(4@

key

(simultaneous

push)

(item

UP)

key

(simultaneous

push)

(item

DN)

select

item

adjusted.

(2)

Adjust

with

the

level

UP/DN

(VOL

UP/DN

key)

key.

3-2.

Other

Service

Mode

Adjustments

()+

key

(simultaneous

push)

cut

off:

(NO

VERTICAL

DEFLECTION)

ON/OFF

SELF

CHECK

(1)

Indicates

sync

signal

and

acknowledgement

each

IC.

(2)

Example

display

screen

ISYNG2

;

NG]

RED

indication

(with

aye

;

‘

whe

background)

for

PLL

‘PIF!

NIGAM!

AUD

TEXT

RGBAvcD

MEMORY

YELLOW

indication

GREEN

indication

for

(without

background)

for

model

with

circuit.

(3)

Operation:

@®_

gets

into

service

mode

with

key

operation;

[©

S]-Orey

+()key—>

(4)

key

+(8)key

indicates

screen

with

()

G)key.

amplitude

adjustment.

Linearity

balance

between

top

and

bottom

screen.

linearity

correction

Linearity

balance

between

top/bottom

and

center.

picture

position

adjustment.

Setting

amount

amplitude

correction

against

variation

screen

brightness.

amplitude

adjustment.

-10-

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