Toshiba 3787DB Manual de usuario

TOSHIBA

SERVICE

MANUAL

COLOUR

TELEVISION

C8SS

Chassis

TABLE

CONTENTS

aise

GENERAL

ADJUSTMENTS

SAFETY

INSTRUCTIONS

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SPECIFIC

INFORMATIONS

SETTING

ADJUSTING

DATA,

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APPENDIX:

CIRCUIT

DIAGRAM

ttasmme

GENERAL

ADJUSTMENTS

SAFETY

INSTRUCTIONS

WARNING:

BEFORE

SERVICING

THIS

CHASSIS,

READ

THE

“X-RAY

RADIATION

PRECAUTION”,

“SAFETY

PRECAU-

TION’

AND

“PRODUCT

SAFETY

NOTICE”

INSTRUCTIONS

BELOW.

X-RAY

RADIATION

PRECAUTION

Excessive

high

voltage

can

produce

potentially

hazard-

The

only

source

X-RAY

RADIATION

this

receiver

ous

X-RAY

RADIATION.

avoid

such

hazards,

the

high

the

picture

tube.

For

continued

X-RAY

RADIATION

pro-

voltage

must

not

above

the

specified

limit.

The

nominal

tection,

the

replacement

tube

must

exactly

the

same

value

the

high

voltage

this

receiver.is

zero

type

tube

specified

the

parts

list.

beam

current

(minimum

brightness)

under

power

Some

part

this

receiver

have

special

safety-related

char-

source.

The

high

voltage

must

not,

under

any

circum-

acteristics

for

X-RAY

RADIATION

protection.

For

contin-

ued

safety,

parts

replacement

should

undertaken

only

stances,

exceed

kV.

after

referring

the

PRODUCT

SAFETY

NOTICE

below.

Each

time

receiver

requires

servicing,

the

high

voltage

should

checked

following

the

HIGH

VOLTAGE

CHECK

procedure

this

manual.

recommended

that

the

read-

ing

the

high

voltage

recorded

part

the

service

record.

important

use

accurate

and

reliable

high

voltage

meter.

SAFETY

PRECAUTION

WARNING

Service

should

not

attempted

anyone

unfamiliar

with

the

necessary

precautions

this

receiver.

The

following

are

the

necessary

precautions

observed

before

servicing

this

chassis.

Anisolation

transformer

should

connected

the

power

line

between

the

receiver

and

the

line

before

any

service

performed

the

receiver.

Always

discharge

the

picture

tube

anode

the

CRT

conductive

coating

before

handling

the

picture

tube.

The

picture

tube

highly

evacuated

and

broken,

glass

fragments

will

violently

expelled.

Use

shatter

proof

goggles

and

keep

picture

tube

away

from

the

unprotected

body

while

handling.

When

replacing

chassis

the

cabinet,

always

certain

that

all

the

protective

devices

are

put

back

place,

such

as;

non-

metallic

control

knobs,

insulating

covers,

shields,

isolation

resistor-capacitor

network

etc.

PRODUCT

SAFETY

NOTICE

Many

electrical

and

mechanical

parts

this

chassis

have

special

safety-related

characteristics.

These

characteristics

are

often

passed

unnoticed

by-a

visual

inspection

and

the

protection

afforded

them

cannot

necessarily

obtained

using

replacement

components

rated

for

higher

voltage,

wattage,

etc.

Replacement

parts

which

have

these

special

safety

char-

acteristics

are

identified

this

manual

and

its

supplements;

electrical

components

having

such

features

are

identified

the

international

hazard

symbols

the

schematic

diagram

and

the

parts

list.

Before

replacing

any

these

components,

read

the

parts

list

this

manual

carefully.

The

use

substitute

replacement

parts

which

not

have

the

same

safety

characteristics

specified

the

parts

list

may

create

shock,

fire,

X-ray

radiation

other

hazards.

WARNING:

BEFORE

SERVICING

THIS

CHASSIS,

READ

THE

“X-RAY

RADIATION

PRECAUTION”,

“SAFETY

PRECAU-

TION”

AND

“PRODUCT

SAFETY

NOTICE”

PAGE

THIS

MANUAL.

SET-UP

ADJUSTMENT

The

following

adjustments

should

made

when

complete

realignment

required

new

picture

tube

installed.

Perform

the

adjustments

order

follows

Color

Purity

Convergence

White

Balance

Note:

The

PURITY/CONVERGENCE

MAGNET

assembly

and

rubber

wedges

need

mechanical

positioning.

Refer

figure

”

pad

Lud

pan)

pr)

Lud

There

are

adjustment

purity

and

convergence

some

picture

tube

(Unified

with

purity

magnet).

COLOR

PURITY

ADJUSTMENT

NOTE

Before

attempting

any

purity

adjustments,

the

receiver

Remove

the

Rubber

Wedges.

should

operated

for

least

fifteen

minutes.

Rotate

and

spread

the

tabs

the

purity

magnet

(See

fig-

Demagnetize

the

picture

tube

and

cabinet

using

degauss-

ure

2.)

around

the

neck

the

picture

tube

until

the

green

ing

coil.

belt

is in

the

center

the

screen.

the

same

time,

enter

Set

the

brightness

and

contrast

maximum.

the

raster

vertically.

Use

green

raster

from

among

the

built-in

test

signals.

Slowly

move

the

yoke

forward

backward

until

uniform

Loosen

the

clamp

screw

holding

the

yoke

and

slide

the

green

screen

obtained.

Tighten

the

clamp

screw

the

yoke

backward

forward

provide

vertical

green

belt

yoke

temporarily.

(zone)

the

picture

screen.

Check

the

purity

the

red

and

blue

raster.

TEMPORARY

DEFLECTION

MOUNTING

YOKE

29.1mm(28",

29")

25mm(25")

19mm(19",

20",

21")

14mm(13",

14")

Int

RUBBER

WEDGE

ADHESIVE

PURITY/

CONVERGENCE

DEFLECTION

MAGNET

ASS'Y

YOKE

GLASS

CLOTH

TAPES

Figure

CONVERGENCE

ADJUSTMENTS

NOTE:

Before

attempting

any

convergence

adjustments,

the

receiver

should

operated

for

least

fifteen

min-

utes.

CENTER

CONVERGENCE

ADJUSTMENT

Use

the

cross-dot

pattern

from

among

the

built-in

test

sig-

nals.

Set

the

brightness

and

contrast

for

well

defined

pattern.

Adjust

two

tabs

the

4-Pole

Magnets

change

the

an-

gle

between

them

(See

figure

2.)

and

superimpose

red

and

blue

vertical

lines

the

center

area

the

picture

screen.

Turn

the

both tabs

the

same

time

keeping

the

angle

constant

superimpose

red

and

blue

horizontal

lines

the

center

the

screen.

Adjust

two

tabs

6-Pole

Magnets

superimpose

red/

blue

line

and

green

one.

Adjusting

the

angle

affects

the

vertical

lines

and

rotating

both

magnets

affects

the

hori-

zontal

lines.

Repeat

adjustments

3, 4,

keeping

mind

red,

green

and

blue

movement,

because

4-Pole

Magnets

and

6-Pole

Magnets

have

mutual

interaction

and

make

dot

movement

complex.

—

[cu

4-POLE

MAGNETS

PURITY

MAGNETS

CONVERGENCE

MAGNET

ASSEMBLY

Figure

BLU

RED

4-POLE

MAGNETS

MOVEMENT

ADJUST

THE

ANGLE

(VERTICAL

LINES)

CIRCUMFERENCE

CONVERGENCE

ADJUSTMENT

Loosen

the

clamping

screw

deflection

yoke

slightly

allow

the

yoke

tilt.

Temporarily

put

wedge

shown

figure

(Do

not

remove

cover

paper

adhesive

part

the

wedge.)

Tilt

front

the

deflection

yoke

down

obtain

better

convergence

circumference.

(See

figure

3.)

Push

the

mounted

wedge

into

the

space

between

picture

tube

and

the

yoke

fix

the

yoke

temporarily.

Put

other

wedge

into

bottom

space

and

remove

the

cover

paper

stick.

Tilt

front

the

yoke

right

left

obtain

better

conver-

gence

circumference.

(See

figure

3.)

Keep

the

yoke

position

and

put

another

wedge

either

upper

space.

Remove

cover

paper

and

stick

the

wedge

picture

tube

fix

the

yoke.

Detach

the

temporarily

mounted

wedge

and

put

an-

other

upper

space.

Stick

picture

tube

fix

the

yoke.

After

fixing

three

wedges,

recheck

overall

convergence.

Tighten

the

screw

firmly

fix

the

yoke

and

check

the

yoke

firm.

Stick

three

adhesive

tapes

wedges

shown

figure

ROTATE

TWO

TABS\\

THE

SAME

TIME

(HORIZONTAL

LINES)

ADJUSTMENT

MAGNETS

RED/BLU

GRN

RED/BLU

6-POLE

MAGNETS

MOVEMENT

Center

Convergence

Magnets

INCLINE

THE

YOKE

(OR

DOWN)

(INCLINE

THE

YOKE

RIGHT

(OR

LEFT)

Circumference

Convergence

DEF

Yoke

Figure

Dot

Movement

Pattern

SERVICE

MODE

ENTERING

SERVICE

MODE

Press

¢X

button

once

Press

button

again

While

pressing

the

button,

Remote

Control.

keep

pressing.

press

button

set.

[item

_——_——_

SUE

(Service

mode

display)

pr)

{

owed

Pad

DISPLAYING

THE

ADJUSTMENT

Press

button

TV.

Service

mode

Adjustment

mode

Item

___Press_

Data

Press

KEY

FUNCTION

THE

SERVICE

MODE

The

following

key

entry

during

display

adjustment

provides

special

functions.

single

horizontal

line

ON/OFF:

-/--

button

(on

Remote)

-©

button

(on

TV)

Test

signal

selection

-©

button

(on

Remote)

Selection

the

adjustment

items

Channel

A/¥

(on

Remote)

Change

the

data

value

Volume

+/-

(on

Remote)

Adjustment

mode

ON/OFF

button

(on

TV)

Initialization

the

memory

(QA02)

CALL

Channel

button

(A)

Reset

the

count

operating

protect

circuit

“OO”:

CALL

Channel

button

(¥)

“RCUT”

selection

button

“GCUT”

selection

button

“BCUT”

selection

button

“CNTX”

(or

“SCNT”)

selection

button

“COLC’

selection

button-

Color

thickness

correction

“TNTC”

selection

button

note:

Displayed

differently

shown

below,

de-

Test

audio

signal

ON/OFF

(1kHz)

button

pending

the

setting

the

receiving

color

Self

diagnostic

display

ON/OFF

button

system.

COLP

(PAL)

COLC

(NTSC)

COLS

(SECAM)

CAUTION

Never

try

perform

initialization

unless

you

have

changed

the

memory

IC.

SELECTING

THE

ADJUSTING

ITEMS

Every

pressing

CHANNEL

button

the

service

mode

changes

the

adjustment

items

the

order

table-2.

(¥

button

for

reverse

order)

ADJUSTING

THE

DATA

Pressing

VOLUME

+/—

button

will

change

the

value

data

the

range

from

OOH

FFH.

The

variable

range

depends

the

adjusting

item.

EXIT

FROM

SERVICE

MODE

Pressing

POWER

button

turn

off

the

once.

INITIALIZATION

MEMORY

DATA

QA02

After

replacing

QA02,

the

following

initialization

required.

Enter

the

service

mode,

then

select

any

item.

Press

and

hold

the

CALL

button

the

Remote,

then

press

the

CHANNEL

button

the

TV.

The

initialization

QA02

has

been

complated.

Check

the

picture

carefully.

necessary,

adjust

any

adjustment

item

above.

Perform

“Auto

Memory”

the

owner’s

manual.

CAUTION:

Never

attempt

initialize

the

data

unless

QA02

has

been

replaced.

TEST

SIGNAL

SELECTION

Every

pressing

button

the

Remote

Control

changes

the

built-in

test

patterns

screen

described

below

SERVICE

MODE.

*Redraster

—

Signal

off

——»

NTSC

signals

(14

patterns)

PAL

signals

(14

patterns)

All

Black

All

White

Black

White

Black

cross-bar

White

cross-bar

Black

cross-bar

—

_ongreen

raster.

Black

cross-hatch

White

cross-hatch

Black

cross-dot

White

cross-dot

signal

(white)

signal

(black)

The

signals

marked

with

are

not

usable

display

the

Test

signal

for

some

model.

”

pr]

SELF

DIAGNOSTIC

FUNCTION

Press

“9”

button

Remote

Control

during

display

adjustment

the

service

mode.

The

diagnosis

will

begin

check

interface

among

IC's

are

executed

properly.

During

diagnosis,

the

following

displays

are

shown.

Indicated

color

mode

now

selected

Green

and

Red

<SELFE

CHECK>

Indicated

color

other

modes

White

2390****

Green

Normal

POWER

Red:

The

microcomputer

operates

provide

judgement

BUS

LINE

video

signal.

The

red

color

still

indicated

BUS

CONT

though

the

signal

input,

failure

may

exist

input

BLOCK

signal

line

including

QVO1.

QV01

case

indication

green

---Normal

case

indication

red

with

input

signal----

Failure

may

exist

output

line

including

QV01.

QOOOOO

oe]

”

Part

number

microcomputer

(QA01)

Operation

number

protecting

circuit

----“O0”

nor-

mal.

When

indication

other

than

“O00”,

overcurrent

apts

flow,

and

circuit

parts

may

possibly

damaged.

BUS

LINE

CHECK

----“OK”

normal.

“SDA1-GND”

-------------

SDA-GND

short

circuit.

“SCL1-GND”

--------------

SCL-GND

short

circuit.

“SCL1-SDA1”

---

SCL-SDA

short

circuit.

BUS

CONT

----“OK’

normal.

When

indication

shows

“Q

OOO

NG”,

the

device

with

the

number

may

possibly

damaged.

The

items

marked

with

“"

are

not

usable

display

the

SELF

DIAGNOST|C

FUCTION

for

some

model.

DESIGN

MODE

ENTERING

DESIGN

MODE

Select

the

Service

mode.

While

pressing

CALL

button

Remote

Press

button

TV.

and

press

button

TV.

Press

~<—

ITEM

——____»

~<—

DATA

Press

(Design

mode)

(Adjustment

mode)

When

QA02

initialized,

items

“OPTO”

and

“OPT1”

DESIGN

MODE

are

set

the

data

the

representative

model

this

chassis

family.

Therefore,

because

ON-SCREEN

specification

remains

the

state

the

representative

model.

This

model

required

reset

the

data

items

“OPTO”

and

“OPT1”.

SELECTING

THE

ADJUSTING

ITEMS

Every

pressing

CHANNEL

button

the

design

mode

changes

the

adjustment

items

the

order

table-3.

ADJUSTING

THE

DATA

Pressing

VOLUME

button

will

change

the

value

data.

Pou

OY)

_—)

aad

pee

ELECTRICAL

ADJUSTMENTS

ADJUSTMENT

PROCEDURE

Enter

the

service

mode,

then

select

any

item.

Press

the

TV/VIDEO

button

the

Remote

until

the

black

cross-bar

pattern

ap-

pears

the

screen.

Adjust

the

FOCUS

control

(on

T461)

for

well

defined

scanning

lines

the

picture

screen.

ITEM

FOCUS

ADJ

Set

CONTRAST

minimum,

and

BRIGHTNESS

center

adjusting

user

controls.

Set

the

service

mode

get

white

cross-bar

inside

pattern.

Select

BRTC

(brightness

correction),

and

adjust

the

—

button

reduce

the

value

that

white

portion

inside

pattern

slightly

light.

Adjust

button

increase

the

data

value

BRTC,

and

set

just

before

the

difference

between

the

belt

vertical

retrace

and

the

border

black

Belt

vertical

retrace

portion

inside

pattern

visible.

After

that,

return

vertical

height

and

contrast.

Set

the

service

mode,

and

get

black

white

cross-bar

signal

with

VIDEO

button

remote

hand

unit.

Select

either

HPOS

(Horizontal

picture

phase)

VPOS

(Vertical

picture

phase)

with

CHANNEL

buttons,

and

adjust

horizontal

vertical

picture

position

the

center

screen

with

VOLUME

—

buttons.

Set

the

service

mode,

and

get

black

white

cross-hatch

signal

with

VIDEO

button

remote

hand

unit.

The

first

Select

HIT

(Vertical

amplitude)

with

CHANNEL

buttons,

and

adjust

vertical

amplitude

with

VOLUME

—

buttons

that

vertical

am-

plitude

lacks

little.

Adjust

vertical

amplitude

with

VOL-

UME

—/+

buttons

that

the

first

bar

cross-hatch

signal

touches

edge

screen.

SUB-BRIGHTNESS

(BRTC)

Note:

Constrict

the

picture

height

until

the

vertical

retrace

line

appears

adjusting

the

item

HIT

(HEIGHT).

HORIZONTAL

POSITION

ADJUSTMENT

(HPOS)

VERTICAL

POSITION

ADJUSTMENT

(VPOS)

VERTICAL

AMPLITUDE

ADJUSTMENT

(HIT)

~10-

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