Taxan Ergovision 740 LR Manual de usuario

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TPAXAN

Document

Title:

Ergovision

740

LR

&

740

TCO

Service

Manual

001

Nigel

Inkson

issue

Number:

Issued

By:

Revisions:

001

Original

Issue

22/05/96

Document

Control

Date

of

Issue:

22/05/96

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Safety

Standards

and

Approvals

This

monitor

complies

with

DHHS

Rules

21

CFR

Subchapter

J

Applicable

at

date

of

manufacture.

Certified

to

comply

with

che

limits

for

a

Class

B

computing

device

pursuant

to

part

15

of

FCC

rules

Please

refer

to

instructio~s

included

FCC

notice

in

the

user’s

manual

if

this

equipment

is

suspected

of

causing

interference

tc

radio

reception.

Important

Safety

Notice

This

equipment

conizins

special

components

which

are

important

for

safety.

These

critical

parts

should

only

be

replaced

with

the

parts

specified

by

the

manufacturer

in

order

to

prevent

X-radiation,

shock,

fire

or

other

hazards.

Do

not

modify

the

orginal

design.

Mi

Preface

i

Before

You

Start

General

Safety

Precautions

1.

Use

an

isolation

transformer

in

the

power

line

and

AC

supply

to

troubleshoot.

2.

When

servicing,

observe

the

original

lead

dress,

espe-

cially

in

the

high

voltage

circuits.

If

a

short

circuit

is

found,

replace

all

parts

which

have

been

overheated

or

damaged.

3.

Before

turing

the

display

on,

measure

the

resistance

between

B+

line

and

chassis

ground.

Connect

the

nega-

tive

side

of

an

ohmmeter

to

the

B+

fines

and

the

positive

side

to

chassis

ground.

Each

line

should

have

more

resisstance

than

the

following

specifications:

|

+200V

134.5KQ

|

}

TV

60.51KQ

(eee

ees

ee

ee

PER

Bak

|

+15V

27.13KQ

|

4.1502

4.

Potentials,

as

high

as

26kV

are

present

when

this

display

is

in

Operation.

Operation

of

the

display

without

the

rear

cover

involves

the

danger

of

a

shock

hazard

from

the

display

power

supply.

Servicing

should

not

be

at-

tempted

by

anyone

who

is

not

thoroughly

familiar

with

the

precautions

necessary

when

working

on

high

volt-

age

equipment.

Always

discharge

the

anode

of

the

pic-

ture

tube

to

the

display

chassis

before

handling

the

tube.

5.

After

servicing,

be

sure

to

check

the

items

listed

in

the

Safety

Checkout,

below

before

returning

the

serviced

unit

to

the

customer.

Safety

Checkout

The

following

checks

must

be

made

after

correcting

the

original

service

problem

and

before

the

unit

is

returned

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

inter

board

wiring

to

ensure

that

no

wires

are

pinched

or

coated

with

high-wattage

resistors.

3.

Check

that

all

control

knobs,

shields,

covers,

ground

Straps

and

mounting

hardware

have

been

replaced.

Makde

absolutely

sure

you

have

replaced

all

the

insula-

tors.

4,

Look

for

any

unauthorized

replacement

parts,

particu-

larly

transistors,

that

may

have

been

installed

dueing

a

previous

repair.

Point

them

out

to

the

customer

land

recommend

their

replacement.

5.

Look

for

parts

which,

though

functioning,

show

obvious

signs

of

deterioration.

Point

them

out

to

the

customer

and

recommend

their

replacement.

6.

Check

the

line

cord

for

cracks

and

abrasion.

Recom-

mend

the

replacement

of

any

such

line

cord

to

the

customer.

7.

After

making

any

repair,

check

the

B+

and

HV

to

see

whether

they

are

at

the

values

specified.

Make

sure

your

instruments

are

accurate;

if

your

HV

meter

always

shows

a

low

HV,

check

the

meter

to

ensure

it

is

not

malfunctioning.

8.

Carry

out

the

leakage

current

checks

as

detailed

below

overleaf,

Leakage

Current

Cold

Check

1.

Unplug

the

AC

cord

and

connect

a

jumper

between

the

two

prongs

on

the

plug.

2.

Turn

on

the

display

power

switch.

3.

Use

an

ohmmicter

to

measure

the

resistance

value

be-

tween

the

jumpered

AC

plug

and

cach

exposed

metallic

cabint

part

on

the

display,

such

as

scre«heads,

terminals

control

shafts,

etc.

When

an

exposed

metallic

part

has

a

return

path

to

the

chassis,

the

reading

should

be

between

240k

and

5.2M.

When

exposed

mets:

does

not

have

a

return

path

to

the

chassis,

the

reading

must

be.

vy

i,

Leakage

Current

Hot

Check

1.

Plug

the

AC

cord

into

the

AC

outlet.

Do

not

use

an

isolation

transformer

for

this

check.

2.

Connect

a

1.5k,

10

watt

resistor

in

parallel

with

a

0.15F

capacitor

between

each

exposed

metallic

part

on

the

set’

and

a

good

earth

ground

(see

How

to

Find

a

Good

Earth,

below)

as

shown

in

the

diagram

below.

Leakage

Current

Hot-Check

Circuit

AC

VOLTMETER

oY

—~O

o

0.15nF

=

MW

15002,

10W

To

instrument's

—*

exposed

metal

parts

Example

of

Leakage

Current

Hot-Check

Circuit

Good

earth

ground

3.

Use

an

AC

voltmeter

with

1000

ohms/volt

or

more

sensitivity

to

measure

the

potential

across

the

resistor.

4.

Check

each

exposed

metallic

part,

and

measure

the

voltage

at

each

point.

5.

Reverse

the

polarity

of

the

AC

plug

in

the

AC

outlet

and

repeat

the

above

measurements.

6.

The

potential

at

any

point

should

not

exceed

0.75

volt

RMS.

A

leakage

current

tester

(Simpson

Model

229,

RCA

WT-540A

or

equivalent)

may

be

used

to

make

the

hot

checks.

Leakage

current

must

not

exceed

0.5

milliamp.

Ifa

measure-

ment

is

outside

of

the

specified

limit,

there

is

a

possibility

of

a

shock

hazard

and

the

monitor

should

be

repaired

and

re-

checked

before

it

is

returned

to

the

customer.

How

to

Find

A

Good

Earth

A

cold

water

pipe

is

a

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

(0)

ohms.

If

a

cold

water

pipe

is

not

accessible,

connect

a

60-100

watt

trouble

light

(not

a

neon

lamp)

between

the

hot

side

of

an

AC

power

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

its

at

ground

potential

Trouble

light

Mie

Ohmmeter

AC

Wall

Socket

Cold

water

pipe

How

to

Check

for

Earth

Ground

Table

of

Contents

[Section

1)

Product

Specification

1.1.Monitor

Control

Locations

&

Functions

.

2...

0

ee

ee

ee

1-1

1:2:Product

Overview.

6.6

eck

a

ee

Re

te

ew

Oe

Ee

1-2

1:3:CRT

Characteristics:

«ise

sok

Zak

de

Ae

OE

ee

SR

1-2

44.

Power

SpeciliGations:

o.&

%-%.4

a

wi.

cameta

Ae

he

Ge

eae

eee

we

ewe

GAS

1-2

PVA

ATPOWErSUDDIV:

4.

Gas

GE

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Reh

Be

ae

ee

a

ee

Ee

ew

S

1-2

1.4.2.PowerManagement

...

0...

2

1-2

1.5.Video

Specifications.

2

0.

ee

1-2

1.5.1.Video

Amplifier

Performance.

........

Rade

eae

ba

Ses

eh

det

va

a

Meee

a

Peery

Gack

1-2

1.5.2.Video

Input

Signal

Characteristics

..

0.

0

ee

ee

1-2

1.6.Syne

Inpub’Signal

Characteristics:«-

«

x-y.4.4

ste

aw

G

hee

oh

ok

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we

1-2

Os

Separate:

Synce

sei

2

cet

neta

we

Ea

a

een

Ohne

aint

AO

ee

1-2

4:

6:2.Composite:Sync.

sk

sce

eta

wa

RB

a

ek

ee

ede

1-2

16:3:;Syne-On-Greens:..4,

ats.

isk

a

ee

ees

PS

Posed

Sah

eee

he

Ae

ae

ee

1-3

Te7-Environmentalis

25.4.

248

ae

ee

a

ae

ER

Ae

te

en

Ae

ee

ee

1-3

1.7.1.Temperature/Humidity/Altitude

.......

teddies

ee

ates.

tf

oe

a

eas

1-3

1752

Vibration

Test.

sa

vee

ised

Gea

we

AA

oe

we

ene

ek

be

ae

Gee

1-3

TFS

sDIOD

MOS

4:

ate

te

ok

Aad

va

GE

ee

ee

Ee

OT

a

1-3

1.8.Preset

Timing

Modes

.

2...

1-3

[Section

2.

Disassembly

Instructions

2.1.Removing

the

Rear

Cover

2.

10.

2-1

2.2.Remove

Top

Shield

and

Rear

Shield...

2...

2

ee

ee

2-1

2.3.Internal

Disassembly

(Right

Side).

2

2

2

2-1

2.4.Internal

Disassembly

(Left

Side)

.

2...

ee

2-1

2.5.Removing

the

Neck

Board

&

Main

Board...

1...

es

2-2

2.6.Remove

the

Control

Board

..

2...

2.

2-2

[Section

3,

Theory

of

Operation

3.1

ySwitehing

Power

Supply”

4.02

4.0.

2g

Aes

ieee

A

Eb

be

Be

a

ee

et

3-14

Sol

WwAUtO-degauSsing:

6...

ad

ota

aoe

Sayer

ae

Sl

be

ae

aes

we

deat

ed

3-2

3.1.2.Suspend

Mode

Operation

..

1...

3-2

3.2.The

Deflection

Circuit.

2.

3-2

3.2.1.16301

LM1291

Video

PLL

System

for

Continuous-Syne.

2...

ee

3-2

3.2.2.1C301

LM1291

Pin

Descriptions

..

2...

2.2...

ee

3-4

3.2.3.1C302

LM1295

DC

Controlled

Geometry

Correction

System

2...

2.

...02..

3-5

3.2.4.1C302

LM1295

Pin

Descriptions

..

2...

ee

3-5

3.2.5.Vertical

Deflection

Circuit.

2.

0

2

2

ee

ae

ee

ee

ee

3-6

3.2.6.Geometry

Correction

Circuit

2...

3-7

3.2.7.Structure

of

Horizontal

Deflection

Circuit.

2

2

ee

3-7

3:2.8.X-RAY

Protection:

Citeult

.205

cee

ew

op

a

we

ee

3-12

S279:

The

FOCus

Circuit

oa

sye,

oe

ier

Bel

a

eS

OH

ad

ee

he

Sd

A

3-12

EV740LR

Service

Manual

Table

of

Contents

/

1

3.2.10.Horizontal

linearity

and

CS

Switching

|

.

3.3.Video

Amplifier...

2...

002,

3.4.Microprocessor

And

Sync

Processing

......

.

Section

4

Setup

Adjustments

4.1.Preparing

the

Display

for

Adjustment

...

2...

4.1.1.Test

Equipment

Required...

0.0.2.2...

4.2.Adjustment

Procedures

........020022..,

4.2.1.Adjustment

Sequence

...........,

4.2.2.Preset

Timings

Used

During

Adjustment

4.3.High

Voltage

Verification...

.......022.

4.4.G1

Voltage

Adjustment...

.....000000.

4.5.Background

Brightness

Setting

..........

4.6.Screen

Brightness

Adjustment...

.....020..,

4.7.Magnetic

Field

Configuration.

.......20202..,

4.8.Raster

Center

Verification

.......0002,

4.9.Tilt

Verification

2.2.0.0...

.000000000,

4.11.Color

Misconvergence

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

4.12.Primary

Test

Mode

Performance

Adjustments

.

4.13.Performance

Adjustments

for

All

Preset

Modes

4.14.lmage

Performance

Verification

..

2.0.0...

4.15.Uniformity

Verification.

.

2...

4.16.Brightness

Verification

Hg)

FN

Ae

we

ae

4.17.Display

Size

Stability

2...

000.0000

20.,

4.18.Color

Purity

Verification...

2...

4.19.Video

Noise...

.

2...

ee

4.20.Power

Saving

Check

.........,..0.2..

4.21.DDC

1/2

Data

Writing...

2...

[Section

5.

Troubleshooting

5.1.No

Display

at

Power-on

..

2...

.0.020002..,

5.2.No

X-ray

Operation...

2...

2...

5.3.No

Video

Operation

........0..00020..

5.4.Poor

VerticalLinearity

..........0.00.,

5.5.Poor

Horizontal

Linearity...

2...

2

5.6.Poor

Uniformity...

5.7.Tilted

Display

Area...

5.8.Misconvergence

............0.....,

5.9.Poor

Regulation

.

2...

00000020204,

5.10.PoorFocus

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

0...

[Section

6,

Printed

Circuit

Boards

6.1.Neck

Board...

.....02.2.20,022..,

6.2.Main

Board

......2.2.,20202202..,

2/

Table

of

Contents

6:3:

Control:

Board’

ss

sch.

acee

y,

ae

a

we

Bah

Soe

IS

al

ak

ae

a

Se

6-3

6.4.PCB

Wiring

Connection...

2.

ee

6-3

Schematic

Diagrams

7.1.Video

Circuit

Diagram

.

6.

1

toluene

7-1

7.2.Deflection

&

S/P/S

&

Logic

Circuit

Diagram...

2...

ee

ee

7-1

Mechanical

Parts

Be

Key

to-Exolodad

Views

«oce's

ak:

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a

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©

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Be

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OR

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8-1

6:2.Exploded

VieW:

25

Lak

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dete

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ae

a

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a

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ea

gS

he

8-2

[Section

9!

PCB

Component

List

9.1.Explanation

of

Parts

Listing...

ee

9-1

9:2"

Main

Board:

c.g

8

sara

Ce

acds

Foc

hee

A

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er

ee

ER

ae

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ee

ee

te

9-1

9:9:Neck

Board!

2-23

oso.

Gls

8 a

Rte

ws

ate

a

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od

te

a

A

a

9-7

9:4.

Control:

Board.

2.3

05.

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9-9

9.5.HITACHI

CRT

Different

List.

2.

2

2.

9-9

9.6.

TOSHIBA

CRT

Different

List

2...

2

9-9

EV740LR

Service

Manual

Table

of

Contents

/3

Notes

4/

Table

of

Contents

EV740LR

Service

Manual

~

Product

Specification

Tate

Monitor

Control

Locations

and

Functions

........-

1-1

1.2.

Product

Overview

...

2...

0.

cee

eee

eens

1-2

13;

CRT

CharacteristicS

..

0...

6c

cee

eee

eee

1-2

1.4.

Power

Specifications.

0.6...

.

eee

eee

eee

eee

1-2

1.5.

Video

Specifications

....

6...

cere

eee

eee

ees

1-2

1.6.

Sync

Input

Signal

Characteristics

........-..++-.

1-2

Tet

Environmental.

......00

00

ee

eee

eee

teenies

1-3

1.8.

Preset

Timing

Modes

......-.-.

seer

tress

1-3

EV740LR

Service

Manual

:

:

:

1.1.

Monitor

Control

Locations

&

Functions

TAXAN

crconsion

rin

laongs

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PREVENTER

SELECT

aDjUST

f

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:

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|

|

KEY

TO

BUILT-IN

MONITOR

CONTROL

FUNCTIONS

Manual

Degauss

and

Ractery.

Se

ing

Recall

unction

Digital

control

for

manual

degauss

of

monitor

at

the

normal

condition

and

for

recall

the

origional

factory

setting,

during

OSD

pattern

is

on

screen.

Thumbwheel

for

Adjusting

Setting

and

OSD

Function

Selection

Thumbwheel

for

adjusting

the

setting,

clockwise

for

increasing

and

counterclockwise

for

decreasing

and

selection

the

OSD

function

icon.

Push

Button

for

OSD

|

Press

to

call

up

OSD

function

into

screen

and

confirm

the

thumbwheel

ON/OFF

and

enter

for

icon.

Thumbwheel

Enter

Confirm

Increase

/

decrease

raster

black

level

using

thumbwheel

adjusting,

Brightness

Control

:

B

clockwise

for

increasing

and

counterclockwise

for

decreasing.

utton

Contrast

Control

Butto

Increase

/

decrease

video

gain

using

thumbwheel

adjusting,

clockwise

for

n

increasing

and

counterclockwise

for

decreasing.

Hard

power

On/Off

button.

Adjacent

LED

is

lit

when

on.

The

LED

color

is

green

for

normal

condition

and

change

to

orange

for

DPMS

condition.

—

Power

On/Off

1-1