CTX CMS-3435 Manuel utilisateur

|

RD

|

NO.

SM-0030

|

CHUNTEX

:

|

:

;

|

SERVICE

MANUAL

|

CMS-3435/36

CAUTION:

Before

servicing

this

chassis,

it

is

important

that

the

service

technician

should

read

the

"Safety

Precautions"

and

"Product

Safety

Notice"

in

this

Service

Manual.

CONTENTS

SAFETY

PRECAUTIONG...........:::ccceeereeeteeeeees

2

DESCRIPTION

OF

CIRCUIT........0.::

cece

10

CHECK

OF

HIGH

VOLTAGE

HOLD

DOWN

ADJUSTMENTS.

...0...

cece

ecceeseeeeeeseeeeeneeeenenetes

13

CIRCUIT..........::eccsccssessrrscesnseseesesereceseeceneesensseenns

3

TROUBLE

SHOOTING...

16

PRODUCT

SAFETY

NOTICE............::ceeeeeereees

3

BASIC

CIRCUIT

DIAGRAM.............::eeeeereereee

22

FEATUREG............-cccesssssssesseseeessesnesseerereetensenenss

4

PRINTED

WIRING

BOARD...........:::csereteereees

25

SPECIFICATIONS.

.........csecccseesseseeeeeteeeeeeersenseens

5

BLOCK

DIAGRAM.

...........2.:ccceeseeseeeeeeteeeetee

eee

eetes

27

CONTROLG.......-..0.csssssssseecseseessreeneersteeesseenseneese

6

EXPLODED

VIEW

DIAGRAM.............:-

eee

28

SIGNAL

TIMING

CHART.

..........::ceeeeeeeseereeeees

8

REPLACEMENT

PARTS

LIST............-::eeeere

29

SPECIFICATIONS

AND

PARTS

ARE

SUBJECT

TO

CHANGE

FOR

IMPROVEMENT

HIGH

RESOLUTION

MULTISCAN

COLOR

MONITOR

March

1990.

EDITION

1.0

SAFETY

PRECAUTIONS

NOTICE:

Comply

with

all

cautions

and

safety

located

on

or

inside

the

cabinet

and

on

the

chassis

or

picture

tube.

The

following

precautions

should

be

observed.

1.

Do

not

install,

remove,

or

handle

the

picture

tube

in

any

manner

unless

shatterproof

goggles

are

worn.

People

not

so

equipped

should

be

kept

away

while

picture

tubes

are

handled.

Keep

picture

tube

away

from

the

body

while

handling.

When

replacing

a

chassis

in

the

monitor,

all

the

protective

devices

must

be

put

back

in

place,

suchas

barriers,

non-metallic

knobs,

adjustment

and

compartment

shields,

and

isolation

resistor-

capacitor,

etc.

When

service

is

required,

observe

the

original

lead

dress.

Extra

precaution

should

be

taken

to

assure

Correct

lead

dress

in

the

high

voltage

circuitry

area.

Always

use

the

manufacturer’s

replacement

components.

Especially

critical

components

as

indicated

on

the

Replacement

parts

list

should

not

be

replaced

by

other

manufacturer’s.

Fur-

thermore

where

a

short

circuit

has

occurred,

replace

those

components

that

indicate

evidence

of

overheating.

Before

returning

a

serviced

monitor

to

the

cus-

tomer,

the

service

technician

must

throughly

test

the

unit

to

be

certain

that

it

is

completely

safe

to

operate

without

danger

of

electrical

shock,

and

be

sure

that

no

protective

device

built

into

the

monitor

by

the

manufacturer

has

become

defec-

tive,

or

inadvertently

defeated

during

servicing.

Therefore,

the

following

checks

should

be

per-

formed

for

continued

protection

of

the

customer

and

service

technician.

High

Voltage

This

monitor

is

provided

with

a

high

voltage

hold

down

circuit

for

clearly

indicating

that

voltage

has

increased

in

excess

of

a

predetermined

value.

Comply

with

all

notes

described

in

this

Service

Manual

regarding

this

hold

down

circuit

when

servicing,

so

that

this

hold

down

circuit

may

function

correctly.

Service

Warning

With

minimum

Brightness

and

Contrast

the

operating

high

voltage

in

this

display

is

lower

than

25KV.

If

any

component

having

influence

on

the

high

voltage

is

replaced,

confirm

that

the

high

voltage

with

minimum

Brightness

and

Contrast

is

lower

than

25

KV.

To

measure

high

voltage

use

a

high

impedance

high-voltage

meter.(SENSITIVE

RE-

SEARCH

Model:

ESH

or

Equivalent)

Connect

(-)

to

chassis

earth

and

(+)

to

the

CRT

anode

button.

(See

the

following

connection

diagram

Fig.

1.)

NOTE:

1)

Turn

power

switch

off

without

fail

before

making

the

connection

to

the

Anode

button.

2)

Beforeturn

power

switch

ON,

confirm

the

AC

line

voltage,

set

the

"Voltage

Selector".

CRT

ANODE

HIGH

IMPEDANCE

H.V.METER

SENSITIVE

RESEARCH

Model:ESH

or

equivalent.

CHASSIS

GROUND

Fig.

1

X-radiation

TUBE:

The

primary

source

of

X-radiation

in

this

monitor

is

the

picture

tube.

The

tube

utilized

in

this

chassis

is

specially

constructed

to

limit

X-

radiation

emissions.

For

continued

X-radiation

protection,

the

replacement

tube

must

be

the

Same

type

as

the

original,

manufacturer

ap-

proved

type.

When

troubleshooting

and

making

test

measurements

in

a

monitor

with

a

problem

of

excessive

high

voltage,

avoid

being

unneces-

sarily

close

to

the

picture

tube

and

the

high

voltage

components.

Do

not

operate

the

chas-

sis

longer

than

is

necessary

to

locate

the

cause

of

excessive

voltage.

CHECK

OF

HIGH

VOLTAGE

HOLD

DOWN

CIRCUIT

Checking

of

the

high

Voltage

hold

down

circuit

operation.

1.

Turn

the

switch

of

the

unit

OFF.

2.

Set

Brightness,

Contrast

controls

to

max.

3.

Connect

a

DC

Voltmeter

and

an

adjustment

jig

as

shown

in

Fig.

2.

4.

Setthe

adjustment

VR

to

fully

counterclockwise.

5.

Turn

the

switch

of

the

unit

ON

and

gradually

rotate

the

adjustment

VR

counterclockwise.

6.

Check

that

a

reading

of

DC

voltmeter

is

less

than

9.4V

+

0.5V

when

picture

disappears.

Clockwise

i

Variable

resistor

©

TPS

To

chassis

ground

VR309

500K-B

H.

V.

1/2

W

Protector

R391

i

R390

Main

Board

Assembly

Fig.

2

7.

Turnthe

switch

of

the

unit

OFF

immediately

after

checking

that

the

picture

disappears.

8.

Remove

the

adjusting

jig

and

the

DC

voltmeter.

Note:

Reading

of

9.4V

is

approximately

equivalent

to

28

KV

of

CRT

Anode

High

Voltage.

PRODUCT

SAFETY

NOTICE

Many

electrical

and

mechanical

parts

in

the

color

monitor

units

have

special

safety

teristics.

These

are

often

not

evident

from

visual

inspection

nor

can

the

protection

afforded

by

them

necessarily

be

obtained

by

using

replacement

components

rated

for

higher

voltage,

wattage,

etc.

Replacement

parts

which

have

these

special

safety

characteristics

are

identified

in

this

Service

Manual.

Electrical

components

having

such

features

are

iden-

tified

by

marking

with

"!"

on

the

parts

list

in

this

Service

Manual.

The

use

of

a

substitute

replacement

component

which

does

not

have

the

same

safety

characteristics

as

the

manufacturer

recommended

replacement

one,

shown

in

the

parts

list

in

this

Service

Manual,

may

create

shock,

fire,

X-radiation,

or

other

hazards.

Product

Safety

is

continuously

under

review

and

new

instructions

are

issued

from

time

to

time.

For

the

latest

information,

always

consult

this

Service

Manual.

FEATURES

OF

CMS-3435/36

Multiscan,

model

CMS-3435/36,

from

Chuntex

is

a

high

resolution

color

monitor

that

automatically

ad-

justs

to

graphics

board

scanning

frequencies

from

15.5KHz

to

38KHz.

Multiscan

gives

IBM

PC,

PC/

XT,

PC

/

AT,

PS

/

2

and

PC

compatibles

users

crisp

text

and

vivid

color

graphics

displays

when

used

with

any

of

the

IBM

graphics

adapters

(the

CGA,

EGA,

MCGA,

VGA,

or

3514A).

Multiscan

can

also

be

used

with

other

IBM

compatible

graphics

adapters

to

provide

IBM

users

with

the

widest

range

of

color

monitor

compatibility

and

capability

available

in

the

market

place.

e

CMS-3435/36

automatically

scans

all

frequen-

cies

between

15.5KHz

and

38KHz

and

is

com-

patible

with

the

IBM

PC,

PC

/

XT,

PC

/

AT,

PS

/2

and

look-alikes.

e

CMS-3435/36

uses

14

inch

fine

pitch

(0.29mm

or

0.28mm)

non-glare

CRT

and

has

a

maximum

horizontal

resolution

of

1024

dots

and

a

maxi-

mum

vertical

resolution

of

768

lines

for

superior

clarity

of

display.

e

CMS-3435/36

is

compatible

with

IBM

CGA,

EGA,

MCGA,

VGA,

8514A

graphic

adapters

and

non-

IBM

Boards

supporting

extended

display

modes

such

as

800

x

600,

132

columns

etc.

This

wide

compatibility

makes

it

possible

to

upgrade

boards

and

software

without

purchasing

a

new

monitor.

@

CMS-3435/36

offers

both

TTL

and

ANALOG

sig-

nal

inputs,

and

in

the

ANALOG

mode

can

display

an

unlimited

palette

of

colors

depending

on

the

graphics

board

and

software

being

used.

Fea-

tures

a

TEXT

SWITCH

witha

choice

of

four

colors

(red,

blue,

green,

amber)

displaying

word

processing,

spread

sheets,

data-bases

or

other

software

in

crisp

alphanumeric

text

on

a

dark-

bulb

black

background.

e

CMS-3435/36

is

equipped

with

vertical

auto

sizing

circuit.

The

circuit

works

according

to

horizontal

frequency

and

sync

polarization

of

IBM

CGA,

EGA

and

VGA

convention.

This

func-

tion

can

be

made

inactive

by

turning

off

the

Auto

Switch

located

on

front

panel

if

the

input

signal

is

non-IBM

standard.

ASSIGNMENT

Glarorors

O\cooo/9

For

TTL

Input

Signals

CGA

EGA

No.

16

colors

16

/

64

colors

1

Ground

2

Ground

Secondary

Red

3

Red

Primary

Red

4

Green

Primary

Green

5

Blue

Primary

Blue

6

Intensity

Secondary

Green

7

N.

C.

Secondary

Blue

8

H.

Sync.

H.

Sync.

9

V.

Sync.

V.

Sync.

For

Analog

Input

Signals

D-SUB

VGA

D-SUB

9

15

1

Red

1

6

R

Return

6

2

Green

2

7 G

Return

7

3

Blue

3

8

-

B

Return

8

4

H.

Sync.

13

5

V.

Sync.

14

9

Ground

10

9

Ground

11

9

Ground

4

*

For

VGA

cards,

signals

are

fed

into

the

monitor

via

an

anolog

cable

which

has

9

D-SUB

connector

on

one

end

and

15

D-SUB

con-

nector

on

the

other,

and

wired

as

the

table

listed

above.

SPECIFICATION

Multiscan

Monitor

Picture

Tube

Pitch

Input

Signal

Display

Colors

Synchronization

Resolution

Video

Band

Width

Active

Display

Area

Misconvergence

Power

Supply

Power

Comsumption

Dimensions

Weight

Environmental

Considerations

0.29mm

0.28mm

CMS-3435

CMS-3436

13

visual

diagonal

inches

Dark

bulb,

Nonglare

etching

Medium

short

persistance

————_—.__—__{

Video:

TTL

Level

Positive

Analog

0.7Vp-p

/

75

Ohm

Positive

Sync.:

Separate

Sync.

TTL

Level

Horizontal

sync.

Positive

/

Negative

Vertical

Sync.

_

Positive

/

Negative

Composite

Sync.

TTL

Level

Polarity

Positive

/

Negative

Composite

Sync.

on

Green

Video

Sync.

0.3Vp-p

Negative

(Video

0.7Vp-p

Positive)

Analog

Input:

Unlimited

colors

TTL:

8/16/64

color

Horizontal:

15.5KHz

to

38KHz

(Automatically)

Vertical:

|

50

Hz

to

90

Hz

(Automatically)

Horizontal:

1024

dots

Vertical:

768

lines

40MHz

(Active

display

area

is

changed

by

signal

timing)

Preset*

VGA

1024x768

EGA

CGA

Horizontal:

245mm

250mm 250mm

240mm

Vertical:

185mm

187mm

190mm

180mm

*Refer

To

Preset

Timing

Chart

Less

than

0.4mm

AC

120V

/

60Hz

or

220

/

50Hz

by

internal

setting

75W

368(W)

x

378(H)

x

387(D)mm

12.8kgs

Operating

Temperature

o°c

to

40°C

Humidity

20%

to

80%

Storage

Temperature

-20°C

to

60°C

Humidity

10%

to

90%

CONTROL

il

uv

fF

ww

NW

Power

Indicator

When

the

power

is

ON,

the

LED

is

lit.

Power

Switch

Used

to

push

the

power

ON

or

OFF.

Auto

Switch

When

this

switch

is

on,

the

VASC

(vertical

auto-

sizing

circuit)

will

be

activated

to

maintain

same

picture

height

when

changing

among

350

/

400

/

480

lines

different

vertical

resolutions

according

to

the

sync

polarization

of

BM

VGA

convention.

For

some

compatible

VGA

boards

which

require

to

set

dip

switch

to

support

different

type

of

mo-

nitors,

their

sync

polarization

might

not

be

com-

patible

with

IBM

standard

if

they

are

set

to

sup-

port

multiscan

monitor

instead

of

standard

VGA

monitor

while

running

VGA

program.

In

such

case,

this

switch

should

be

off

to

make

the

VASC

inactive

without

misadjusting

picture

height

ac-

cording

to

wrong

polarization.

Bright

Control

Used

to

adjust

the

picture

brightness

of

the

screen.

Contrast

Control

Adjusts

the

display

to

the

contrast

preferred

by

the

user.

Analog

/

TTL

Indicator

When

set

in

TTL

mode,

the

LED

is

lit.

10.

11.

Before

connecting

MULTISCAN

series

monitor

with

IBM

personal

computers

or

compatibles

and

IBM

graphics

adapters,

take

time

to

familiarize

yourself

with

the

switches

and

controls

that

give

MULTISCAN

series

monitor

all

its

compabilities.

Manual

/

Auto

Indicator

When

set

in

manual

mode,

the

LED

is

lit.

.

TTL/

Analog

Switch

Used

to

select

an

input

video

signal

-

either

TTL

or

ANALOG

-

of

the

graphics

adapter.

It

is

impor-

tant

to

determine

whether

the

input

signal

of

the

graphics

adapter

being

used

is

ANALOG

or

TTL

prior

to

connecting

the

adapter

with

your

perso-

nal

computer.

Refer

to

instructions

accompany-

ing

the

graphics

adapter

for

information

on

the

input

signal.

H.

Center

Control

Turn

this

knob

for

the

proper

horizontal

position

of

the

display.

Turn

the

knob

clockwise

to

repo-

sition

display

to

the

right;

turn

it

counterclock-

wise

to

reposition

to

the

left.

V.

Size

Control

Turn

this

knob

for

the

proper

vertical

size

of

the

display.

Turn

the

knob

clockwise

for

a

larger

display;

turn

it

counterclockwise

for

a

smaller

display.

V.

Center

Control

Turn

this

knob

for

the

proper

vertical

position

of

the

display.

Turn

the

knob

clockwise

for

a

higher

display

position;

turn

it

counterclockwise

for

a

lower

display

position.

ON

AUTO

ON

12

eo

OFF

MANUAL

OFF

COLOR

TEXT

H-WIDTH

||

15.

12.

H.

Width

13.

Switch

of

display

preferred.

When

this

switch

is

ON;

the

width

of

the

display

size

changes.

Note:

When

the

horizontal

scanning

frequency

is

between

15

and

20

KHz,

H.

Width

cannot

be

adjusted.

Manual

Switch

This

switch

selects

either

the

IBM

mode

or

the

manual

mode.

When

this

switch

is

set

in

Auto

mode,

Multiscan

automatically

works

in

the

IBM

mode

and

adjusts

itself

to

the

scanning

frequen-

cy,

resolution

and

color

requirements

of

the

IBM

compatible

graphics

adapter

being

used.

When

this

switch

is

set

in

manual

mode,

the

user

must

manually

select

the

number

of

colors

(8

/

16

/

64)

needed

by

the

graphics

adapter

being

used

with

the

Color

Switch

(see

15.

below).

Refer

to

ins-

tructions

accompanying

the

graphics

adapter

being

used

for

information

on

how

many

colors

the

adapter

can

display.

ud

14.

15.

13.

12.

Text

Switch

This

switch

controls

the

text

mode

of

Multiscan.

When

it

is

ON,

the

text

of

the

display

will

appear

in

one

color

selected

by

the

Color

Switch,

regardless

of

the

colors

of

the

software

program

being

used.

When

it

is

OFF,

the

color

of

the

software

program

being

used

will

again

be

dis-

played.

The

diagram

below

of

the

dip

switches

shows

how

to

display

text

in

your

choice

of

four

colors.

When

multiscan

is

used

with

mono-

chrome

cards

(MDA

or

Hercules),

please

set

the

Text

Switch

on

and

select

one

of

the

four

colors

with

the

color

switch

(see

15

below).

Color

Switch

This

switch

operates

under

following

mode:

TEXT

SW.

OFF

ON

SW.1

|

SW.2

COLOR

MONO

OFF

ON

8

AMBER

|

ON

|

OFF

|

16

RED

|

ON

|

OFF

|

64

GREEN

OFF

|

OFF

64

WHITE

SIGNAL

TIMING

CHART

Separate

Sync.

HORIZONTAL

-

VERTICAL

fo

wenn]

VIDEO

Cc

D

E

|_@

|

i

Ele

~

=

A

=

O

|

Sync.

Polarity:

Positive

/

Negative

Composite

Sync.

Composite

Sync.

TTL

Level

HORIZONTAL

VERTICAL

l

~~VIDEO

~

2

ae

eee

el

aie

pane

ss

ee

B

fe

5

a

TANIA

Sync.

Polarity:

Positive

/

Negative

Equalizing

Pulse

is

available

Composite

Sync.

On

Green

Video

HORIZONTAL

~

VERTICAL

ie

oe

eee

|B.

|

ee

|

#

Synd.

on

G:

TAR

UUILALAN

A

—(D+B)+(5-B)

Syne.

Polarity:

Negative

Equalizing

Puise

is

available

2

and

2

<=

B

<5uS

Display

format

Horizontal

Dots

Vertical

Lines

Horizontal

Frequency

1)

Sync.

Polarity

Aus

Cus

Dus

Eus

Vertical

Frequency

Sync.

Polarity

Oms

Pms

Q

ms

Rms

Sms

PRESET

TIMING

CHART

EGA

8514A

31.5kHz

15.8kHz

21.8kHz

35.5kHz

31.78 31.78

31.78

1.91

25.42

0.64

70H2

14.27

0.06

1.91

11.12

1.18

25.42

0.64

70H2

14.27

0.06

1.11

12.71

0.38

25.42

0.64

60Hz

16.68

0.06

1.05

16.25

0.32

f

63

4.2

7.2

45

6.6

60Hz

16.4

0.075

1.525

12.6

2.2

45.5

4.9

1.6

39

0

60Hz

16.68

0.6

0.08

28.10

1.15

3.91

22.80

0.24

2)

87Hz

+/—

11.50

0.11

0.56

10.80

0.02

1)

When

AUTO

SWITCH

is

on,

the

vertical

auto-sizing

circuit

will

be

active

according

to

sync.

polarity

in

VGA

mode.

2)

8514A

uses

interlace

mode.

CTX CMS-3435 Manuel utilisateur

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