Tatung Cm-1496 series Operating and installation instructions

SERVICE INFORMATION

MODEL:

CM-1496X

CM-1498X

COLOR

DISPLAY

MONITOR

~

-

;

~

COLOR

DISPLAY

CM-1496X/CM-1498X

SERVICE

MANUAL

'i

~

-

~

-

ro~~~

PAGE

1.REMOVAL

OF

REAR

COVER

1

2.MECHANICAL

DISASSEMBLY

2

3.TECHNICAL

INFORMATION

3

4.

GENERAL

4

5.

DESCRIPTION

OF

OPERATION

5

5-1

SWITCHING

MODE

POWER

SUPPLY

CIRCUIT

5

5-2

AUTOMATIC

DEGAUSSING

CIRCUIT

6

5-3

VERTICAL

DEFLECTION

CIRCUIT

6

5-4

HORIZONTAL

DEFLECTION

CIRCUIT

6

5-5

DYNAMIC

PINCUSHION

CORRECTION

CIRCUIT

7

5-6

VIDEO

CIRCUIT

7

5-7

MODE

CONTROL

CIRCUIT

8

5-8

SELF-TEST

9

5-9

SIGNAL

CABLE

CONNECTIONS

9

6.ALIGNKENT

PROCEDURE

10

7.TROUBLE

SHOOTING

14

8.REPLACEMENT

PARTS

LIST

25

ASSEMBLY

PCB-MAIN

25

ASSEMBLY

PCB-CRT

29

ASSEMBLY

PCB-POWER

30

ASSEMBLY

PCB-LINE

FILTER

32

ASSEMBLY

PCB-LED

32

ASSEMBLY

CRT

33

9.CIRCUIT

BOARD

LAYOUTS

34

10.CIRCUIT

DIAGRAM

36

:

,-

I

,1

Ii

'I

II

I

9

/

~

Ii

I!

•

APPLICATIONS:

*

3.TECHNICAL

INFORMATION

*

***f,,*f,(t.:**~,~(;~****~~****~'c~'cf,,**~,

Analog

R.G.B.

input color display for graphics

and

alphanumeric

use

POWER

INPUT:

Mains

voltage:

100

-

125/200

-

240VAC

SWITCHABLE

50/60

Hz

1.0A(100

-

125VAC)/0.6A(200-240VAC)

VIDEO

SIGNALS:

Red,

green, blue, analog video signals

input levels: 0 - 0.7Vp-p

SYNC.

SIGNALS:

Vertical frequency

53

-

90

Hz

Horizontal frequency: 31.5

KHz/35.5

KHz

SIGNAL

CONNECTOR:

Miniature

D-

shell

male

15

Pin connector

DISPLAY

TUBE:

DATA

AREA:

LINEARITY:

IHSCONVERGENCE:

WHITE

COLOR:

COODINATES

USER

CONTROLS:

14"(l3V),

90

degree

deflection,

0.31

mm

dot pitch,

(CM-1496X)

,0.28mm

dot pitch.

(CM-1498X)

P22

phosphor.

light

transmission rate

46%

reflectivity

45%

-

65%

180

x

240

mm

6%

Max.

Center: 0.3

mm

Max.

Corner: 0.5

mm

Max.

(CM-1496X)

0.4

mm

Max.

(CM-1498X)

X:

0.313

Y:

0.329

Power

ON

-

OFF

switch, Brightness control (with center

detent), contrast control

H.PHASE

1,2,3

H.PHASE

4

H.SIZE

4,5

V.CENTER,

V.SIZE

4,5

CONTROL

OPERATING

AMBIENT:

Temperature: 0 -

35

C

Relative humidity:

10

-

80%

WEIGHT:

12.5

kg

(net)

.-

*************

*

4.GEMERAL

*

~=~---*

CM-1496X/CM-1498X

is a high

resolution

color display using a 0.31/0.28

ma

dot pitch

CRT

with etched

faceplate.

Analog

16-1evels

R.G.B.

video

signals

and

TTL-level seperte sync.

signals

are adopted for graphic

and

text

display.

It

is

designed to provied

you

with a

wide

range

of

compatibility with

various industry graphic standards such as, the

IBM

VGA

PS/2, super

VGA

800X600,

IBM

8514A

l024X768

and

incorporates the automatic

vertical

sizing

circuitry

that

provides automatic

sizing

resolution

of

640X350

up

to

l024X768.

A

self-test

pattern

shall

be

available

when

the signal cable

is

disconne-

cted

from

the driver source.

The

self-test

pattern

will

consist

of

a

full

white

raster

extending

beyond

the display bezel at the top

and

bottom,

with a

vertical

black bar

on

the

left

and/or

right

edges.

4

,;<

5.

DESCRIPTION

OF

OPERATION

,;:

5-1

SWITCHING

MODE

POWER

SUPPLY

CIRCUIT

-.

The

TDA4601

is

designed for driving

controlling

and

protecting the

s~itching

transistor

in flyback converter

power

supplIes during

start-up

~ormal

and

overload operation as well as during disturded operation . In

case

of

disturbance the drive

of

the switching

transistor

is

inhibited

and

a secandary voltage

rise

IS

prevented.

A.

The

start-ur

procedures include three consecutive operating

phase

as

follows:

1.

aui

ld-ur

internal

reference vol tage

The

intenal reference voltage supplies the voltage

regulator

and

effects

charging

of

the coupling

electrolytic

capacitor cannected to

the switching

transistor.

~

Enabling

of

internal

voltage reference voltage

Vl=4V

Simultaneously with

va

reaching approx

12V.

an

Internal

voltage

becomes

available providing

all

component

elements. with the

exceptIon

of

the control

lOgIC

with a thermally

stable

and

overload

resistant

current supply.

3.

Enabl

ing

of

control lagH

In conjunction with the generation

of

the reference voltage.

The

current supply for the control

lOgIC

is

activated

by

means

of

an

additional

stabilization

circuit

The

Integrated

circuit

is

then

ready for operation.

B.

Normal

operation mode/control operation

mode

C.

At

the input

of

2 the zero passage

of

the frequency provided

by

the

feedback

coil

~re

registered

and

forwarded to the control logic Pin 3

( control input overload

and

standing

identification)

receives the

~ectified

amplitude

fluctcations

of

the feedback

coil

the control

amplifier operates with

an

input voltage

of

approx

2V

and

a current

of

a~prox

1.4mA

depending

on

the

internal

voltage reference.

The

overload

identification

limits

in conjunction with

collector

current simulator Pin 4 the operating range

of

the control amplifier

The

collctor

current is sImulated

by

an

external

RC

combinatIon present

at

4

and

internally

set threshold voltage

The

largest

possible

collector

current applIcable with the switching

transistor

increase in

propovtion

to

~he

increased

~apactance

caos

thus the reguired operatIng

range

of

the control

arnplifie~

is

established

the range

of

control

lies

b~tween

a

DC

voltage

clamped

at

2V

and

a

sa~tooth-snaped

rising

AC

voltage

WhICh

can

vary

up

to a

max

amplitude

of

4V

(reference voltage)

during secondary load reductlon the switching frequency

is

increased

and. Pin 5

~t

is possible

to

externally

inhibit

the operatlon

of

the

Ie,

the outp;.it:1.t ?in 8

4i11

be

Inhibited

when

volltage

of~Vref

-O.IV

are present at

5.

A~d

the

bas~

current amplifler forwards the sawtooth-shaped

V4

voltage

to

the output

of

6.

A current feedback with

an

external

resistor

R804

1S

present

between

8

and

7,

the applIed value

of

the

resistor

determines the

max

amplItude

of

the

base

driv1ng current for

the switching

transistor.

Protective

operation

mode

The

base current shut-down

activated

by

the

outpu~

of

P

i;l

7 to

l.

61,1

.

As

a

result

the

~r~~:sistor

1S

inhibited This

protective

supply voltage

a:

9

reach'Os

a

va

lue~6.

7

5

control logic

clamps

the

drive

of

the switching

measure

is

enabled

if

the

V or

if

vol

tage at

.::;;:

Vre~

2

...

....

-.:

-

-O.IV

a~e

present

at

5.

5-2

AUTOMATIC

DEGAUSSING

CIRCUIT

Posistor

R803

and

degaussing

coil

L991

compose

an

Automatic Degaussing

(ADG)

circuit

to demagnetic the

shadow

mask

and

internal

shield

in the

CRT.

Posistor

shows

low

resitance value in normal temperature.

when

apply

AC

line

voltage. current

of

about

20

Ap-p

flows into degaussing

coil.

after

seconds,

resistance

of

posistor increase

rapidly

due

to

rising

in heat,

degaussing current thus decrease to

less

than

120

m

Ap-p,

degaussing

function

is

completed.

5-3

VERTICA~

DEFLECTION

CIRCUIT

The

vertical

sync. signal is applied to Pin 5 &Pin 4

of

Q301.

R343.

C310

connected to

3,

Pin 4

and

Pin 6 determin the

running frequency

of

the

oscillator

inside

Q301.

R342.

free-

The

resistance

between

Pin 7

of

0301

and

ground defines the current

mirror

and

then the height

of

the scanning.

Pin 9

of

Q301

is

output

of

the

current

mirror

that

changes the

series

of

C305

and

C306.

This

is

also the input

of

buffer stage.

10

of

Q301

is the output

of

the buffer stage.

12

of

Q301

is the inverting input

of

the amplifier.

R307

and

R310

define the

DC

level across

C309,

so

allowing a correct

centering

of

the output voltage.

R308

and

C308

in conjuction with

R307

and

R310.

applied at the feedback input Pin

12

of

0301,

a small part

of

the parabola. available across

C309.

and

the

AC

feedback voltage, taken

across

R312. R305,

R30B

and

R310

produce the

linearity

correction

on

the

output scanning current.

The

output

of

po~er

amplifier

from

the Pin 1

of

Q301

drives the

vertical

deflection

yoke

by

a negative slop current ramply.

R309

and

C307

are

used

to

stabilize

the

po~er

amplifier.

The

supply voltage

of

the

power

output stage

is

forced at Pin

2.

During

the trace tlme the supply votage IS obtained

from

the

main

supply votage

by

D301.

while

dUrlng

the

retrace

time

this

Pin is supplied

from

the

internal

flyback generator.

15

is

the output

of

the flyback generator

that,

when

driven.

jumps

from

lo~

to

high

condition.

An

external

capacitor

C304

transfers

the

~ump

to Pin

2.

14

of

Q301

is the

main

supply voltage input.

5-4

HORIZONTAL

DEFLECTION

CIRCUIT

The

positive horizontal sync. pulse

from

Pin 6

of

Q201

is

converted

and

amplified ty

Q406.

Then

be

applied through the

differential

circuit

C407

/

R403

to

3

of

the

horizontal

Ie

Q402.

The

positive

horizontal flyback pulse derived

from

Pin 5

of

FBT

T403

is

~ntegrated

by

the comparable

sa~tooth-waveform

generator

which

is

com-

6

posed of

R410,

R411. R423.

C408.

and

C410.

then

be

applied via

C405

to

Pin 4

of

0402.

The

discriminator

inside the

IC

Q402

detects

the phase

difference

bet-

ween

the sync. input

from

Pin 3

and

the sawtooth-waveforme

from

Pin 4 .

the supper

imposed

pulse outRut

from

Pin 5

of

0402

is

integrated

by

the

low-pass-filter

R407,

C404

and

C403,

AFC

voltage

is

obtained

and

applied

via

R406

to Pin 7

of

Q402.

thereby

controlling

the

oscillator.

The

oscillator

inside

IC

Q402

is

an

RC

type with Pin 7 used to control

the timing.

R404,

R405.

R422,

C402

and

C410

altogether

determine the

horizontal

oscillating

frequency.

The

predriver output

of

Q402

is

at

Pin 1

of

which

duty cycle

is

control-

led

by

R402

and

R403

at

8

of

0402.

Regulated voltage applied

at

Pin 6

of

0402

is

about 8 - 9

volts.

The

output signal

from

Pin 1

of

Q402

is

then amplified

by

Q401

and

coupled

by

T401

to

the horizontal output stage

Q403

for

ON-OFF

control,

thus sawtooth-waveform current through the horizontal

deflection

coil

is

obtained.

Also during the

retrace

time

of

the

horizontal

deflection.

a horizontal

flyback pulse at about

1100

volts

is

produced

at

the

collector

of

Q403.

this

pulse

is

transfered

and

rectified

by

the

FBT

T403

to obtain high

voltage

of

about

22.0KV

tor

anode

of

CRT.

5-5

DPC

CIRCUIT

The

Side

Dynamic

Pincushion Correction

circuit

(Side

DPC)

modulates the

raster

width

as

a function

ot

vertical

deflection.

The

vertical

castle-waveform

from

Pin 1

of

0301

is

integrated

by

C314,

R326, R327,

R328,

C316

etc.

to

produce a parabolic

waveform

necessary

for side pincushion correction,

this

parabolic voltage

is

amplified

by

Q302

and

Q303

stages

and

then

drives

the control winding

of

the

satur-

able

reactor

T402.

The

inductance

of

the

T402

output winding

is

modulated

by

the

vertical

parabolic current.

this

output winding is

inserted

in

series

with the

horizontal

deflection

yoke.

The

horizontal

yoke

current

is

th8n modulated

by

the

correction

voltage

to

correct

side pincushion

distortion.

5-6

VIDEO

CIRCUIT

The

color display contains three video

amplifiers,

one

for each primary

color.

these three amplifiers for the red, green

and

blue

CRT

guns

are

:dentical.

Video

amplifier

consists

of

preamplifier

Q501

(H51387P),

output stage

and

cut off adjustment CIrcuit.

The

operation

of

only

one

channel (blue) is described here.

Analog

video signals IS preadjusted

by

R502

and coupling

VIA

C501.

C502

to input

of

Q501.

Contrast is

DC

controlled

from

14

of 0501.

clamp

pulse provided

from

Pin 7

of

FBT

(T403)

to

PIS

of

0501.

The

output

of

Q501

is

at

21.

7

C504

is

used for

clamp

pulse to charge.

The

B+

of

preamp.

(12V)

and

output stage

is

provided

from

S.M.P.S.

"The

co~posite

blanking pulse

is

provided

from

vert.

circuit

to

Q407.Gl

clamp

the Blanking level

to

A

suitable

position.

5-7

MODE

CONTROL

CIRCUIT

(1)

HORIZONTAL

FREQUENCY

DETECT

H.Sync.

pulse with

different

frequency

was

sent to Pin 6

of

Q211_

(F/V

CONVERTER)

Then

there

ar-e

different

voltage

at

the output Pin

1.

So

we

get a

"HIGH"

at

Pin 1

of

Q212

when

Hor.

freg.

is

31.

5KHz

and

"LOW"

when

Hor.

freq.

is

35.5KHz.

This signal

can

be

used

to

control

Hor.

width,

Hor.

osc.

freq.,

Hor.

phase.

(2)

HOR.

WIDTH

CONTROL

When

Hf=31KHz,

Q212#1

is

"H",

Q209#C

is

"L",

Q214#C

is

"H".

QE802#C

is

"V',

QE801#B

is

"L",

QE801

cutoff,

then

DE801

is

conducted

and

90VDC

was

sent

to

FBT

#9.

When

Hf=35KHz.

QE801

is conducted

and

105VDC

is

sent to

FBT#9

and

DE801

is

cutoff.

Adjusting

RE810

can

change

the

base

current

of

QE801.

then

change

the output

of

QE801

so

as

Hor.

width

when

Hf=35KHz.

(3)

HOR.

OSC.

FREQ.

CONTROL

When

Hf=31KHz,

Q212#1

is

"H".

Q209#C

is

"L".

Q203#9#10#11

is

"L",

then

#12#14#

are connected.

When

Hf=35KHz

Q203#13#14

are connected,

the time constant

of

Hor.

osc.

circuit

will

be

changed.

(4)

HOR.

PHASE

CONTROL

When

Hf=31KHz,

Q203#15#2

are connected.

When

Hf=35KHz.

Q203#15#1

are

connected.

(5)

VOLTAGE

AT

POSITIVE

END

.OF

C204

(POINT

"D")

and

C203

(POINT

HE")

Q201

74LS86

is

an

XOR

LOGIC

IC.

If

the input pulse

of

#2

is

posltlve.

#3

also positive. This pulse

will

be

filtered

by

C204

to

get a

"L"

at

pointHD.

However

a negative pulse

will

be

filtered

as

a

"H".

It's

the

same

condition

at

point

HE".

(See

tabe 1 for

reference).

The

output

at

#8

and

#6

are

always

positive for easy

sync.

H.SYNC.

MODE

1 +

MODE

2

MODE

3

V.SYNC.

POINT

"D"

L

+ H

H

(6)

SIZE

CONTROL

OF

MODE

3

POINT

"E"

H

L

H

TABLE

1

Q208

74LS138

is

a 3-to-8 decoder (Multiplexer).

When

fH=31KHz.

Q209#C

is

"L".

0205

is

conducted. Adjusting

R315

can

vary the

picture size

of

mode

3.

From

table

1

we

can

know

that

Q208#1#2

are

"H".

so

that

Q208#13#14

are

"H".

D202/0204

are cutoff R208/R211 are

disabled. Since

Q214#C

is also

"H"

R241/R207

are also disabled too.

(7)

SIZE

CONTROL

OF

MODE

2

From

table

1.

DIE

are

H/L,

Q208#14

is

"L".

0202

are conducted.

Adjusting

R208

can

vary

picture

size

R315.has to

be

preseted before

adjusting

R208

since

R208

is

parallel

to

R315

now.

(8)

SIZE

CONTROL

OF

MODE

1

8

.-

Q2081l3

is

"L",

R211

is availabe

and

parallel

to

R315

(9)

SIZE

CONTROL

OF

KODE

4

Q304(PWB-1627)

74LS123

is a

monos

table multivibrator.

We

use

it

to

delay the sync. pulse.

In

mode

4,

the period

of

vertical

sync. is

around

11.6mS.

When

We

delay

that

pulse for 11.6aS,

it

becomes

a

DC

voltage.

The

DC

voltage

from

Pin 5 will

make

Q305

saturated.

When

0305#C

is

"L

n,

0210tC

is

"H",

then

0213#14#13

are connected.

R207

is

available

and

parallel

to

R340,

(R241

is

always

available

when

fH=35KHz)

and

in series to

R241.

(10)

SIZE

CONTROL

OF

MODE

5

When

the period

of

sync. pulse

is

much

longer than

11.6mS

(e.g

18mS)

There

is a negative pulse at

0304#5.

Once

the pulse

in

"L"

condition,

C322

will discharge

by

the

way

of

D312

.

So,

C322

cannot

have

enough

voltage

to

saturate

0305

Then,

Q213#14#13

will

disconnected

and

R207

is disabled.

Only

R241

is

available for

adjusting.

5-8

SELF

TEST

Self

test

signal suppied

from

heater buffered

by

0205,

0206,

0207

and

via

R214,

R215,

R216

to

the video input

to

generate

full

white screen

with black

vertical

bar

on

the

left

and/or right edges.

When

the display

is

connected

to

a system unit the

collector

of

0204

is

grounded

to

make

a dark screen.

5-9

SIGNAL

CABLE

CONNECTIONS:

Pin Signal

Signal

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

1

Red

Signal 9

No

2

Green

Signal

10

Digital

Ground

3

Blue

Signal

11

Jumper

to Pin

10

4

Jumper

tD

10

12

No

5

Self-test

13

Horizontal

Sync.

6

Red

Return

14

Vertical

Sync.

7

Green

Return

15

No

8

Blue

Return

9

.-

o

5

1

':.

6.

Al.l

GMMEMT

PROCEDURE

l~

6-1

EQUIPl'IENTS

1.

Manual

degaussing

coil

2.

DSClll.Qscop~

+

probe

3.

D~gi!al

vcltmeter

4. Color a:1alyzer

5.

Pdt:'

6.

EHT

meter with high voltage

probe

5-2

POWER

SUPPLY

OUTPUT

VOLTAGE

Connect

a

DVM

to S.K.P.S. output red wire adjust the voltage to

90V

by

means

of

R813.

6-3

VERTICAL

FREQUENCY

Connect

a frequency counter across the

vertical

deflection

coil.

adjust

the frequency.

To

49Hz

by

means

of

R314.

the

signal

cable

must

be

disconnected

from

the

PC.

6-4

HORIZONTAL

FREQUENCY

Use

a

test

pattern.

Without

horizontal sync. input. adjust

R422(31.5KHz)

and

R405(35.5KHz)

to

get the color bar in

an

upright

position.

6-5

PINCUSHION

Straighten

the side

lines

with

R327

and

R328.

6-6

WIDTH

~djust

the

data

area width

to

240

+/-

5

mm

using

L402.

(fH=31.5KHz)

6-7

VERTICAL

CENTERING

Center the data area with

R338.

6-8

VERTICAL

LINEARITY

~cjust

the squares equal in height with

R316.

6-9

HEIGHT

3

(480

lines)

Adjust data area height

to

180

+/-

5

mm

with

R315.

6-10

HEIGHT

2

(400

lines)

Switch

to

400

lines

mode. Adjust data area height to

180

+/-

5

mm

with

R208.

(Be

sure that height 3

has

been

adjusted)

6-11

HEIGHT

1

(350

lines)

Switch to

150

lines

mode

Adjust data area height to

180

+!-

5

mm

with

R211.

(Be

sure that height 3

has

been

aajusted)

6-12

HEIGHT

5

(600

lines)

10

.-

Switching to

600

lines

mode. Adjust data area height

to

180

+/-

5

II

wi

th

R241.

6-13

HEIGHT

4

(768

lines)

Switching

to

768

lines

mode

Adjust data area height to

180

+/-

5

mm

with

R207.

(Be

sure that height 5

has

been

adjusted)

6-14

FOCUS

ADJUST

Adjust

FBT

focus

VR

to

get best

overall

focus screen.

6-15

WHITE

X/Y

Turn

the brightness

VR

to

center

detent

position,

contrast

VR

to

minimum.

Set cut-off drive

VR

R910/R940/R970

to center.

Turn

the sub-brito

VR

R443

to a position

where

to get the

Gl

voltage

is

-25V.

Turn

the

G2

control to a position

where

to get the brightness

just

disappears.

Turn

the

achieve

0-5

F.L.

brightness

VR

to

max.

the color coordinates

and

adjust

the

R910,R940

and

R970

to

X=0.313

Y=0.329

roughly

and

brightness

Use

full

field

white pattern, turn the

contrast

to

maximum,

brightnes

at

detent,

adjust

R502,

R532

and

R562

to achieve the correct

X,Y

coordinates.

Then

turn contrest

VR

to get

3J.L.

Adjust

R910/R940/R970

to achieve correct

X,Y

coordinates.

6-16

F/V

CONVERTER

ADJUSTMENT:

(MODE

3,

FULL

WHITE

SIGNAL)

Adjsut

R235

VR

to get

0.7V

+/-

0.1 between

#P2

(+)

and

#P1

(-)

or

between

Q212#3(+)

and

Q212#2(-)

after

warm

up

the

set

for

20

minutes.

6-17

INTERLACE

ADJUSTMENT:

Receiving 1024x768(interlaced)

signal,

display small

"s"

character.

Adjust

R218

so

that

small "s"

is

not

distorted.

11

.-

I.

IBm

o

5

t

Magnets Ring

Stopper

Deflection

Yoke

CRT

Neck

6- Po

le

Convergence magnet

~-?ole

convergence

magnet

6-18

STATIC

CONVERGENCE

ADJUSTMENT:

NOTE:

Before

attempting

any

convergence adjustment, the display should

be

operate for

at

least

thirty

minutes.

(1)

Apply

the crosshatch pattern to the display.

(2)

Adjust the

BRIGHTNESS

and

CONTRAST

controls for well defined

pa

ttern.

(3)

Refer to the structure

of

picture tube

(See

Fig

6-1) to

make

sure

the

relative

position

of

the convergence

magnet.

BLU

.RcD

",U"

..

--

+f

I

. I

REO·-

_.

I

-

--

Fig

6-2

RED

/SLU

GAN

r=ff="

RcD

I

;(

_.

__

•

__

..l._

--I

BLU

I

GRN-

---

I I

I

-l

Fig

6-3

(4)

Adjust

two

tabs

of

the 4-pole

Magnets

to

change

the angle

between

them

and

superimpose

red

and

blue

vertical

lines

in

the center area

of

the picture

(See

Fig

6-2).

(5)

Turn

both

tabs at the

same

tile

keeping

their

angles constant to

superimpose red

and

blue horizontal lines

at

the center

of

the

screen

(See

Fig

6-2)

(6)

Adjust

two

tabs

of

6-pole

Magnets

to

superimpose red/blue line with

green

one.

Adjusting the angle

affects

the

vertical

lines

and

rotating

both

magnets

affects

the horizontal

lines.

(See

Fig

6-3)

(7)

Repeat

adjustments (4). (5). (6).

until

best convergence

is

obtained.

12

.-

6-17

TIMING

CHARTS

HORIZONTAL

-J

Q

1-

U

VERTICAL

-i~

PRE-SET

TIMING

VGA/PS2

COMPATIBLE

fH

31.5

KHz

Aus

31.

77

Bus

3.77

Cus

1.

89

Ous

25.17

Eus

0.94

Fr

70Hz

OilS

14.27

Pms

0.064

QIIS

1.88

1.

08

Rras

11.126

12.716

Sms

1.2

0.41

SEPARATE

SYNC.

REMARKS

H.SYNC.

POSITIV

NEGATIVE

V.SYNC.

NEGATIVE

POSITIVE

VIDEO

'--1_---'

R

..

I~

U.----

o

..

/

SYNC.

POLARITY

:

POSITIVE/NEGATIVE

8514/A

800X600

COMPATIBLE

35.52KHz

35.16KHz

28.15

28.44

3.92 2

1.

25

3.56

22.8

22.22

0.18

0.67

60Hz

87

Hz

56

Hz

16.68

11.5

17.78

0.064

0.113

0.06

1.

02

0.563

0.6

15.246

10.81

17.07

0.35

0.014

0.03

SEPARATE

INTERLACED

SEPARATE

SYNC.

SEPARATE

SYNC.

H

.SYNC.

SYNC.

H.SYNC.

H.

SYNC.

NEGATIVE

H.SYNC.

NEGATIVE

POSITIVE

V.SYNC.

POSITIVE

V.SYNC.

NEGATIVE

V.SYNC.

NEGATIVE

POSITIVE

.-

13

I

i

I..

_'C,-

No

Raster

f:·.;,:,::::'EF'~

i

t Check

90V

Line

i

!

OK

Check H. V.

Operation

OK

Check

12V

Line

OK

Check

CRT

Heater

OK

Turn

the Screen (R448)

Control

Clockwise

OK

Check the Screen Voltage

******#*******~~******

l~

7.

TROUBLE

SHOOTI.;

*

**********************

..--

Measure

90V

Pin on the Main Board (PWB·1561)

NG

-I

Check the SMPS

Unit

NG

Check

0402,0401,

0406

H. V.

Output

Circuit

NG

Check the SMPS

Unit

PWB-1345A

NG

Check

6.3V

Pin on the

Video

Drive Board

(pWB-1299B)

OK

NG

6.3V

Line Failure Connect the

6.3V

-

Check SMPS

Unit

Line

from

SMPS

::1

T403

FBT

Unit

Failure

r--

.

NG

CRT

Failure

or

Video

Drive Board

----

PWB

1299B Failure

14

1

.-

No

Picture on the

CRT

Check the Signal Connector

on

the- Personal

Computer

!

NG

OK

Lock

the Signal

Connector

on

the

Personal

Computer

JOK

Check the Signal Housing

NG

Connect

Signal Housing

to

P901

on

PWB-1299B P901

on

PWB-1299B

OK

1

0K

Check

12V

Line on

,.

PWB-1299B

,:

I

NG

OK

Check SMPS

12V

Line

Check Clamping Pulse on

PWB-1299B H. Pin

I

NG

OK

Check PWB-1561 O. Pin

Check

PWB

1299B

Q501

.-

15

SMPS

NO

Action

]

NG'

I I

Check

Fuse

on PWB·142aA Replace Fuse

OK

NG

I I

Check Oa01 Replace

0801

OK

NG

I I

Check Ra08

Ra10

Replace R80a. Ra10

OK

Check B+ =

250V

-350 Vdc

NG

Check Rectifier Ckt.

OK

NG

I I

Check

0803

Replace Oa03

OK

NG

I I

Check

Oa20

-

0824

Replace Oa20 -Oa24

OK

I

NG

I I

Check IC801

#5

~

2.5V? Check Ra05

OK

~

I

NG

I I

Check IC801

#2

:::::

2.5V? Check Ra16

OK

Replace ICa01

.-

16

Abnormal Vertical Height

Horizontal

Line

y N

Check

20V

Line

OK

NG

Check Fusiable R320

OK

Check

0306,

0307,

R340, Q301

17

Too

High or

Too

Low

Check SMPS

20V

Line

Check, R304, R340, R312, R208,

R207, R241, R211, R315

r

-"--

-_.

-.

t

J -

!

f~-'~;'-

,

Abnormal Hor Width

+

Check B

90V

Line

OK

-

NG

Re-adjust

L402

OK

NG

Check L403, R420, C422

OK

Check RE810, Q214

QE801, QE802

Adj

R813 on

PWB-1345A

I Replace L402 I

.-

18

Tatung CM-1496 Series Operating and installation instructions

Popular Monitor manuals by other brands