CTX 1565D Manuel utilisateur

CONTENTS

1.0

IMPORTANT

NOTICE

&

INTRODUCTION

000.0...

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1

2.0

GENERAL

MAINTENANCE

PROCEDURE

...............:cccsscceescceseensessersuceeseeeseeecssessesseeesses

2

3.0

FUNCTION

BLOCK

DIAGRAM

BLOCK

0...

cceeeccececscesecececeeseenseccessesscneesceeeecceeaseeeseteess

3

4.0

TIMING

MODE

(CTX

Presetting

Timing)

..............---eccsccseccccecessseevscssnssseaeeeeeeeeeseeesseeeeenens

4

5;

DADJUST

IMENT

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seeeceeatenenenteaeetentenees

6

6:0

TROUBLESHOOTING

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8

6.1

MAIN

TROUBLESHOOTING

ROUTINE

..........

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8

6.2

POWER

SAVING

CIRCUIT

TROUBLESHOOTING

ROUTINE

..........:::::cecceeeeeereees

9

6.3

POWER

SUPPLY

CIRCUIT

TROUBLESHOOTING

ROUTINE.........:cssscsssesseeerenes

11

6.4

VIDEO

CIRCUIT

TROUBLESHOOTING

ROUTINE..........cscsssssceseeceereseesnersceesatsenes

13

6.5

DEFLECTION

CIRCUIT

TROUBLESHOOTING

ROUTINE.

...........::cseeessreeesereeenes

15

6.5.1

Horizontal

Deflection

Circuit

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

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15

NO:

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H-ASYNCHIONOUS.........eesecceeeeesceeceeeseeeenseescennaeeeesanseecseeessesesconecetensoreeerensenens

16

LITO

ANALY.

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17

Out

Of

Phase

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18

Width

Abnormal

...............ecccceceeseecesssseessscceesssncesessaaseeseerseeneessenaeseaverseeenenses

18

6.5.2

Vertical

Deflection

Circuit

..........

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19

NO

Vertical

SCAN

........

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19

Side

pir

GiStOtION

«2.0.0.2...

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20

V-ASYNCHIONOUS...........seccccceeeessseesecceresesnesceensensccnecesecessseeeessnsnseesesesesenecentaens

21

Vertical

position

.....:.........eessssscssceesseeeseceeeeeeesseececesenessaanessesaceesonerrsresereesseres

21

Vertical

SIZ

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22

7.0

1C

CONFIGURATION

.................ccceceeceteccececececnereesearessccneeesasensussesesansaneanaereauseaseeeereseeeees

28

8.0

LAYOUT

FOR

MAIN

COMPONENTS

AND

ADJUSTED

..........ceccceececseseeeeeeeeeteneeneneeeneets

29

9.0

CIRCUIT

DIAGRAM.

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29

40.0

RECOMMENDED

SPARE

PARTS

LIST

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30

11.0

CRT

CONTRAST

LIST

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31

Copyright

by

Chuntex

Electronic

Co.,

Ltd.

The

CTX

TROUBLESHOOTING

GUIDE

is

published

by

Chuntex

Electronic

Co.,

Ltd.

All

rights

reserved.

No

part

of

this

manual

may

be

used,

copied,

reproduced,

or

transmitted

in

any

form

or

by

any

means

for

any

purpose

without

the

express

written

permission

of

the

publisher.

.

The

publisher

has

been

trying

its

best

to

make

this

publication

perfect,

and

in

this

manner

takes

no

responsi.

tity

for

the

use

of

any

of

the

materials

or

methods

described

in

this

manual,

or

for

the

products

thereof.

Neither

will

the

publisher

be

responsible

for

any

damages

caused

by

misuse

or

misquotation.

Information

in

this

manual

is

subject

to

change

by

the

publisher

without

any

notice

in

advance.

CTX

is

a

registered

trademark

of

Chuntex

Electronic

Co.,

Ltd.

1565D

1.0

IMPORTANT

NOTICE

&

INTRODUCTION

IMPORTANT

NOTICE

Please

read

before

attempting

service

1.

While

the

monitor

is

in

operation,

do

not

attempt

to

connect

or

disconnect

any

wires.

.

Make

sure

the

power

cord

is

disconnected

before

replacing

any

parts

in

the

monitor.

.

When

the

power

is

on,

do

not

attempt

to

short

any

portion

of

the

circuit.

This

shorting

may

cause

damage

to

the

transistors

in

the

monitor.

.

When

servicing

the

H.V.

area,

be

certain

that

the

C.R.T

anode

is

safely

discharged

before

removing

the

anode

cap.

.

Caution

must

exercised

when

servicing

this

monitor.

INTRODUCTION

Enhanced

repair

capabilities

This

troubleshooting

guide

is

edited

for

model

1565D

when

service

is

necessary.

there

are

four

primary

parts

included

in

this

troubleshooting

guide

which

offer

the

-easiest

way

to

locate

problem

points

and

repair

the

machine

to

the

best

possible

condition.

1.

The

Adjustment

section

offers

the

adjustable

method,

steps

and

all

data

of

the

factory's

initial

settings

which

can

make

the

machine

get

the

best

performance

at

that

time.

By

the

way,

before

adjusting,

the

machine

must

be

warmed

up

for

at

least

10

minutes

and

the

CRT

face

must

be

in

an

east

ward

direction.

.

The

Troubleshooting

section

has

four

main

parts

including:

power

supply,

power

saving,

CRT,

deflection

&

video

circuit.

Each

offers

fast

repair

routine

and

the

IC,

transistor

voltage

records

against

all

specified

signal

modes.

These

voltage

readings

are

measured

wth

a

HP

34401A

multimeter

with

input

impedance

10MQ

(0.1V~

1000V

range)

and

waveforms

shown

on

circuit

schematics

are

measured

by

a

Tektronix

TDS

520

digital

oscilloscope,

the

monitor

receives

VGA-480

full

white

square

pattern.

CTX

1.0

IMPORTANT

NOTICE

&

INTRODUCTION

.

The

CRT

contrast

list

offers

repairmen

/

technicians

the

contrast

data

when

CRT

replacement

is

necessary

from

a

different

type

of

CRT.

.

The

Spare

parts

list

offers

the

CTX

part

“number

(P/N)

which

is

used

frequently

by

repairmen

/

technicians.

For

details

please

refer

to

the

service

guide

or

service

manual.

If

there

is

any

engineering

change

regarding

this

model,

CTX

will

issue

the

updated

information

by

a

non-periodical

Technical

Bulletin.

2.0

GENERAL

MAINTENANCE

PROCEDURE

2.0

GENERAL

MAINTENANCE

PROCEDURE

START

CHECK

AND

RECORD

THE

.

FAILURE

MODE

OF

CUSTOMER

VISUAL

CHECK

THE

APPEARANCE

OF

CABINET/

CRT

CHECK

PICTURE

PERFORMANCE

NG

OK

REPLACEMENT

|

BURN

IN

24

HOURS

NG

RE-CHECK

PICTURE

PERFORMANCE

RECORD

1565D

REPLACEMENT

CTX

©

1565D

3.0

FUNCTION

BLOCK

DIAGRAM

BLOCK

3.0

FUNCTION

BLOCK

DIAGRAM

BLOCK

AC

UP

KEYSTONE

BAD

GAD

CTX

>

486V

>

+36V

POWER

>

425

SUPPLY

Db

+12V

>

+6V

POWER

SAVING

H

SYNC

.

MICRO

PROCESSOR

&

VSYNC

.

PINCUSHION

CORRECTION

Q503,504

Q512

V-SIZE

V-CENTER

EEPROM

IC501,IC502

HORIZONTAL

&

VERTICAL

PROCESSOR

1C201

(LA7851)

CS

CONTROL

Q704,Q705

Q706,C708

C710,C712

0c

TO

Dc

1€401,Q401

R

L401,D407

J

aS

VERTICAL

HORIZONTAL

HOR.O/P

HIGH

VOLTAGE

HOR-YORK

p

DRIVER

Q701,0702

P|

DEFECTION

H.V

O/P

{C801

Q702,T701

FBT(T702)

>

VERT.

YORK

H.V

REGULATOR

Q711,712

Q713,714

€705,Q708

VIDEO

PRE-AMP

1C601

CRT

(M51387)

H

TOTAL

4.0

TIMING

MODE

(CTX

Presetting

Timing)

1565D

4.0

TIMING

MODE

(CTX

Presetting

Timing

+)

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WIDTH

96

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3.81

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240us!|

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HSYNC

POLARITY

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SERRATION

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COMP

SYNC

POLARITY

4

CTX

1565D

4.0

TIMING

MODE

(CTX

Presetting

Timing)

*

V1024-70

=

[Te

|

~

|

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[ee

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|

[seconnse

|

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ee

H

SYNC

POLARITY

7

+

a

8

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:

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TOTAL

veneer

a

V

SYNC

POLARITY

+

COMP

SYNC

POLARITY

CTX

5

5.0

ADJUSTMENT

5.0

ADJUSTMENT

5.1

1565D

ADJUSTMENT

Brightness

reduce

voltage

adjustment:

VR101,VR102

/-

VGA-480

1.

Use

VGA-480

timing

for

input

signal.

2.

Attach

the

multimeter

(with

a

DC

voltage

range

of

200V)

adjust

VR101

to

get

85.5V

£0.5V

at

TP1.

3.

Adjust

VR102

to

get

12V+0.05V

at

TP2.

Hi-volitage

adjustment:

VR702

/

VGA-480

a.

Turn

the

power

switch

off

before

attaching

multimeter

with

a

high

voltage

probe

by

a

factor

1000:1

between

CRT

anode

and

GND.

b.

Adjust

VR702

to

make

sure

the

measurement

readings

are

25.0V

+

0.2V

(ie

CRT

anode

voltage

is

25.0KV+0.2KV).

Horizontal

hold

adjustment:

VR201,VR202

a.

Connect

TP4

to

GND

and

adjust

VR202

to

get

picture

stand

or

scroll

toward

left

or

right

slowy

when

input

is

8514A

timing

signal.

b.

Change

input

timing

to

VESA1024

and

adjust

VR201

to

get

picture

stand.

.

H-PHASE

adjustment:

EXT

SW

/

ALL

MODE

Adjust

EXTERNAL

H-PHASE

SW

to

shift

.

picture

to

the

center

of

screen,

every

mode.

V-line

adjustment:VR801

/

VESA1024

First

adjust

V-CENTER

EXTERNAL

VR

to

make

picture

to

the

V-center

of

the

screen,

and

then

adjust

VR801

to

correct

the

V-linearity

of

crossh-hatch

pattem.

|

y

1565D

H-WIDTH

adjustment:

VR401

/

VI1024

a.

Tum

EXTERNAL

H-WIDTH

VR

to

min.

position.

b.

Adjust

VR401

to

get

the

picture's

width

is

260+5mm.

V-SIZE

adjustment:

EXT

SW

/

ALL

MODE

Adjust

EXT

V-SIZE

SW

to

get

vertical

size

of

each

mode

is

202+5mm.

PARALLELOGRAM

adustment:

VR204

/

ALL

MODE

Adjust

VR204

to

get

a

picture

that

right

edge

parallel

with

left

edge

of

each

mode;

which

the

spec.

is

+2mm.

’

FOCUS

adjustment:

FOCUS

VR

/

VGA-480

Adjust

FOCUS

VR

on

the

FBT

to

attain

a

balanced

focus

for

all

zones

on

the

screen.

White

balance

adjustment:

a.

Pre

adj.

&

brightness

settings

(Before

adjusting,

CRT

must

be

degaussed.)

(1)

Please

set

the

VR601,

602,

603,

604,

605,

606

on

mechanical

center,

and

_

the

Brightness

VR

to

the

click

point,

the

Contrast

VR

to

Max..

(2)

Operating

on

VGA-480

mosaic

pattern

and

adjust

the

SCREEN

VR

to

set

the

raster

luminance

between

1

~

2FL,

then

adjust

VR604,605,606

(BIAS

VR)

to

make

the

rasters

C.I.E.

coordinates

value

as

x=0.281

+

0.01,

y=0.311

+=

0.01

were

measured

by

color

analyzer.

(3)

Change

timing

to

VGA-400

color

bar

pattem,

correct

SCREEN

VR

whitch

on

the

FBT

to

make

raster

brightness

disapper

and

the

"1"

row

of

color

bar

pattem

(as

below

figure)

visible

obscurely.

2

—visible

1

—visible

obscurely

CTX

1565D

b.

White

balance

fine

regulation:

(1)

Receive

VGA-480

timing,

full

white

square

pattem.

(2)

Adjust

Brightness

VR.

to

MIN.,

Contrast

VR.

to

MAX..

(3)

Adjust

VR601,602,603

to

make

picture

C.1.E.

coordinates

value

as

x=0.281

+

0.01,

y=0.311

+£0.01,

were

measured

by

color

Analyzer.

(4)

Change

the

BRIT.

VR

to

the

click

point

and

adjust

the

CONT.

VR

to

make

the

luminance

of

picture

between

1

~

2FL,

then

adjust

VRE04,

605,

606

(BIAS

VR)

to

get

X=0.281

+

0.005,

Y=0.311

+

0.005,

were

measured

by

color

Analyzer.

(5)

If

the

white

balance

is

not

met,

repeat

step

(2)

~(4).

Please

set

Brightness

VR

to

click

point

and

Contrast

VR

to

Max.,

and

check

item

(3)

of

Per

adj

&

brightness

settings,

then

receive

VGA-480

mosaic

pattem

and

check

the

luminance

of

Mosaic

pattern

is

between

50~

60FL.

if

above

check

item

isn't

meet,

please

modify

VR601

~

VR605

and

retum

to

white

balance

fine

regulation

section.

ADJUSTMENT

FOR

CONVERGENCE

(1)

Use

a

magenta

crosshatch

on

the

display.

(2)

Adjust

the

focus

for

the

best

overall

focus

on

the

screen.

(3)Aiso

adjust

the

brightness

to

the

desired

condition.

(4)

Vertical

red

and

blue

lines

are

converged

by

varying

the

angie

between

the

two

tabs

of

the

4

pole

magnets

on

the

PCM

assembly.

(See

diagram

below)

(5)

Horizontal

red

and

blue

lines

are

converged

by

moving

the

two

tabs

at

the

same

time

keeping

the

angle

between

them

constant.

(6)

Use

a

white

crosshatch

pattem

on

the

display.

(7)

Vertical

green

and

magenta

lines

are

converged

by

varying

the

angle

between

the

two

tabs

of

the

6-pole

magnets.

CTX

5.0

ADJUSTMENT

(8)

Horizontal

green

and

magenta

lines

are

converged

by

moving

the

two

tabs

at

the

same

time.

keeping

the

angle

between

them

constant.

DEFLECTION

YOKE

Xe

6-POLE

CONVERGENCE

MAGNETS

4POU

E

CONVERGENCE

MAGNETS

PURITY

MAGNETS

PCM:PURITY

CONVERGENCE

MAGNET

Note:

Please

don't

adjust

the

purity

magnets

when

service

occurs.

CTX 1565D Manuel utilisateur

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