Taxan Super Vision IVm, Super Vision IV, Super Vision 630, Super Vision 640 Service Manual

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SERVICE

"MANUAL

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12"

'.

COLOR DISPLAY'

SUPER

VISION

DOtlI

DrYl~M

.

, ' . '. , . . TM

-SUPER

VISION

fbJ3JillJlflnlJ{][I1J

, .

IMPORTANT

SERVICE

SAFETY

;

Operatic.n,of monitor outside

of

cabinet

or

with back removed

involves a shock hazard. Work

on

these models should only

be

performed

by

those who arll thoroughly familiar. with prccau-

..

tions neCessary when working on high voltage equipment

•.

Exercise care

when

servicing this chassis with power applied.

Many 8 plus and high voltage

RF

terminals are exposed which.

if

carelessly contactlld. can cause serious shock

or

result

in

dam-

age

to

the

chassis. Maintain interconnecting ground lead con-

. ncetions

bet.ween

chassis. escutcheon and picture tube dag cluster

when operating chassis. The

+8

Adj.Control in this monitor is

sealed

in

order

to.protect

the user from X-ray irradiation. The

...

'

B Adj.Control should

oot

normally have

to

be

adjusted.But

iC

it

is..cr

Ie

it

is replaced due to damage.check the +B voltage to as-

sure that.

it

is within specifications

after

adjustment.Then seal

this control according

to

the manuCacture's specification.

Certain H Y failures can increase X-ray radiation. Monitors

should

not

be

operated with H Y levels exceeding the

specified

rating

for

th«;

chassis

type. The maximwn operating H Y specified

for

the

chassis used

in

these

monitor

is

22

KV

at

zero beam current with a line voltage

of

120Y

AC.

Higher voltage may also increase possibility of failure

in

H·Ysupply.

It

is

important

to

maintain

specified values

of

aU

components'

in

the horizontal and high voltage circuits and anywhere else in

the

monitor

that

could cause a rise in high voltage

or

operating

supply voltage.No changes should

be

made

to

the original de-

sign

olthe

monitor. Components shown in the shaded areas od

the schematic diagram

and/or.

identified

by

&. *

in

the re-

placement.

parts

list should

be

replaced only with exact Factory

recommended replacement

parts.

The use

of

unauthorized

substitute

parts_ may create a shock.

fire.X- ray

radiation.or

other

hazard.

To determine the presenCe

of

high voltage. use an accurate.high

. impedance.H Ymeter connected between

the

second anode leitd

and the CRT dag

groundin~

device_When servicing the High

Yoltage System.remove

static

charge

e~om

it

by

connp.cting a

10K

ohms resistor in series with an insulated wire (such as a

test probe) between picture tube

dag

and 2nd anode lead.

(AC,

line cord disconnected

Crom

AC

supply.)

The picture tube. used in this·

monitor

employs integral implo-

sion protection. Replace with a tube

at the same type number

,Cor

continued

safety.Do

not

IiCt

picture tube by the neck.Han-

dIe

the picture tube only when wearing shatter-proof goggles

and

after

discharging the high voltage completely.Keep l)ttiers

withoutshafter-proofl goggles away.

When

removing springs

or

spring mounting

parts

from the

chassis.shatter-proof gottgles

must

be worn.Keep others without

shatter-proof

goggles away.

••••

e'

SAFETY INSPECTION • •

lor

e'

•

Before returning the monitor to

the

user. per

Corm

the following

safelY checks:

INFORMATION

Super Vision IV /IVM
Super Vision

640/630

• • •

...

PROTECT YOUR CUSTOMER • • • • •

Llnspect all lead dress

to

make certain

that

leads

are

not

pinched and

that

hardware

is

not lodged between the chassis

and, other metal

parts

in the monitor.

2.Replace all protective devices such

as

non·metaUic control

knobs.cabinet back.l\djustment covlu·s.shields.etc.

3.To

be

sure tllat no shock

hazarc!exists.a

check

for the pres·

enee

oC

leakage current should

be

made

at

eech exposed

metal'

part

having a return

path

to

the chassis(jack.cabinet metal.

screw heads. knobs.shaftli.etc.)in the following manner.

Plug the

AC

line cord directly into a 120Y

AC

receptacle.(Do

not use an Isolation Transformer during these checks. ) All

tP.Sts

must be repeated with' the

AC

Hne

cord plug connections.

l'e~

versed.

(If

necessary.a non-polarized

AC

adapter

plug must

be'

used for .the purpose

of

completing these checks.

Do

not other-

wise operate the monitor with an

adapt,.r.)

Ie

available.measure leakage current using an accurate leakage

current tester.Any reading oCO.35MA

or

more· is excessive and

indicates

II

potential shock hazard which must

be

corrected

be-

Core

returning the monitor

to

the owner.

If

a reliable leakage current tester is not available. this alter-

nate method

of

meesurement

sho~I1d

be

used. Using two clip

leads. connect a 1500 ohm:l.l0

watts

resistor paralleled

by

a

0.15MFeapacitor.inseries

with a known

earth

ground.such as.a

water

pipe

or

conduit. and the meta}

part

to

be checked.

Use

a

VTYM

or

YOM with 1000 ohms per

volt.or

higher.sensitivity

to measlire the

AC

voltage drop across the resistor.

Any

reading

of

0.35 volt RMS

or

more is excessive and indicate&a

poten~

tial

shock hazard.This

must

be

corrected before returning the

monitor

to the own.er.

!

!

. ,

0)

a 0

_-----'ACL------,

VOLT

METER

\.

I

1500

OHMS

lOW

O.ISMF

TEST

PROBE

I

TO

EXPOSED

.TO KNOWN

METAL

PARTS_

EARTH

GROUND.

I

, .

IMPORTANT

NOTICE

FOR

SERVICE PERSONNEL BEFORE SERVIC'ING

PLEASE READ BEFORE ATTEMPTING SERVICE

1.' While

the

monitor

isin

operation, do

not

attempt

to

connect

or

disconnect any wires.

10',

sis

2. Make sure

the

power cord is,disconnected before replacing any components

in

the monitor.'

rol

3. 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.

as·
lal

4.

When servicing

the

H;

V.

area,

be

certain tl:lat

the

C.

R~

T anode is.safely discharged

to

ground

Ill.

before removing

the

anode cap.

)0

5.

Caution, must be exercised

when

servicing this monitor.

;I.S

, The regulator has no current Iimitinganq even a momentary short

of

an

output

voltage could

~e-

cause destruction

of

the

pass transistors.

be

!r-

gt'

i

le-

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,

I

tr

..

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ip

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a
a

"'

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a

ly

Ig

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....

- 1 -

IProduct. Outline

'I

This model

is

a 12-inch color display monitor,

used

for a personal computer terminal.

Its

input

is

TIL

s~parate

signals. The input terminal

is

an

8-pin

DIN

)ack.

Specifications

CAT

Signal

input

'

Power Supply
Wattage
Cabinet
Dimensions
Weight
Scanning

frequency

OPERATION

12-inch

type

with

646.8

mm R

• Facing: Non-glare' face 'plate
Facing: Glare face plate

• Screen phosphor:

630/640

Separate

R,

G,

B,

I,

H, V

•

R,

G,

B,

I:

."

Positive

• Sync: Positive or negative

Local commercial

power

supply
SOW
Plastic

630/640A,

B,

S

,

630/640U,

J

B22

(Short persfstence)

322

(W) x 309

(H) x 372

(D)

mm

.

12

kg

24.S

kHz (Horizontal)

54.3

Hz (Vertical)

1.

Plug

the display

and

the computer into

AC

outlets.

2. Set

the

color mode switch

on

the

rear

panel.

3. Connect the signal input terminal

sm

the

rear

panel

to

the computer using the optional cable.

4. Turn on display monitor

and

computer.

5.

The

green

power indicator (just

above

tbe power 'switch), lights, then the

CRT

·screenbrightens.

(There

may

be

9haracters displayed.)

6.

After the monitor warms up,

set

brightness

and

contrast if necessary.

7. Position of the image, image

area,

and

focus

are

preset at

the

factory,

so

you

don't have

to

adjust

these. Depending

oriyour

computer, image width, height,

and

position may differ from

the

stan-

dard settings',

In

such a

case,

reset

as

necessary (controls

are

on

the

rear panell.·

SIGNAL INPUT CONNECTORS

. .

Signals

are

input through a DIN

8P

connector.

Each

signal

is

assigned

as

following:

1 . Pin

assignment

[REAR

VIEW]

.-

2 -

2.

Pin

assignment

:

i

.!

Pin

no.

Signal

1

Reserved

for

special TEXT signal

2

Red

video signal

3 Green video signal

4 Blue video signal

5

Intensity signal

6 Signal ground

.. .

7 Horizontal

or

composite sync signals

~.

..

8 Vertical

sync

signal

HOW

TO SET COLOR MODE

1 .

Set~ing

the

colarmade

.;

The

color mode switch

(a

five-switch

DIP

unit)

is

on the rear panel. Set it

as

follows according

to your computer.

(1) Mode 1

.

Color mode

switch

. Color

...

~'.

. .

..

' .

I-

OPEN

,

~

0 0

oj

IBM

:

.,.

~.

. .

..

..

1

2 3 4 5

(2) Mode 2

..

Color mode

switch

Color

OPEN

AT

& T (OLIVETTI) *

I~

~

0

0

01

1 2

3

4 5

(3) Mode 3

Color mode

switch

Color

I~

OPEN

01

~

0 0

APPLE

1

.

2

3

4

5

(4l

Mode

4·

Color mode

switch

Color

I-

OPEN

.

~

0 D

01

NTSC

1

2 3 4

5

-3-

•

Note

- ADDENDUM

fgr

AT&T

PC6300

and compatibles

630/640

E,

U.

A,B.

S are factory-set to use

with

IBM PC/XT/AT

Of

compatibles. You may need the following adjustment

.in

order

to

obtain maximum performance in display when you use with AT&T PC6300. PC6300

PLUS

computer

and

compatibles.

,.

Curl at top

Turn H.

HOLD

counter-clockwise.

Turn

HoPOSI

clockwise .

D

. 2. Small screen size

al

Horizontal size

Turn

H.

SIZE

c;ounter-clockwise.

bl

Vertical size

Turn

V.

SIZE

counter-clockwise.

CJ

3. Characters missing

at

top

Turn

V.

HOLD

clockwise

..

-4-

2.

Setting

the

sync

signal input

mode

(fifth color

mode

switch)

The sync signal of nearly any personal computer can

be

inp~t

by turning off the fifth

DIP

switch.

But the sync signal

of

a few computers can be input only with this switch on. The following

table shows the switch setting

for

a number of sync signals.

Color mode switch Condition Signal type

OPEN

H. sync: Positive TTL level

A

V. sync: Negative TTL level

10

0

D 0

~I

H. sync: Negative TTL level

8

V. sync: Positive TTL level

1

2

3

4 5

.

C

H. V. sync composite, positive

OPEN

H. sync: Positive TTL level

a

V.sync:

Positive TTL level (AT&T)

10

0 0

0

~I

H. sync:

~egative

TTL level

b

V.

sync: Negative,TTL level (18M,

1 2 3

4

5

JAPANESE)

e'

c

H.

V.

sync

composite. ne'gative

3

'.

Setting

the

signal color display

mode

Turnin'g

of

the TEXT switch

(on

the

front

of the unit) changes the display

to

single-color mode.

Super Vision monitor can now be

used

as

a monochrome display monitor. There are four basic

monochrome modes: green, amber, reversed white,

and

white

on

blue.

The

monochrome mode

is

set by the third and fourth DIPswitches

as

follows.

, ' I

,

color

Color

mode

switch

OPEN, '

I

Green'

10

D

~

~

01

1

,2

3

4 5

r

10

0

OPEN

01

i

~.,

~-

Amber

3

4 5

I

-

1 2

\0

OPEN

01

l

~

,

••

Reversed

white

0

~

~

1

2

3

4

5

OPEN

*.

White

on

blue

10

0

~

~

01

1 2

3

4-

5

-

-Note:

In reversed white or white on blue Uppermost raster does nofappear

/'

mode,

the

following phenomena

or its disappearing position varies

may appear

as

described

on

the 'depending on the brightness,
right.
These are quite normal for this

One

or both

ends

are

brighter

V

mode.

v

than other

areas

.

......

lowest

two or three rasters run

off

the screen.

- 5 -

INDICATORS·

AND

CONTROLS

POWER

INDICATOR

(GREEN

LEDI

POWER

SWITCH (PUSH ON. PUSH

OFF)

TEXT SWITCH

BRIGHTNESS

CONTRAST

COLOR

MODE SWITCH

VERTICAL

SIZE

FOCUS

. HORIZONTAL

SIZE

VERTICAL

POSITION·

~

'"

""'VERTICAL

LINEARITY

•

'\:

VERTICAL SYNC

.•

'.'

~ORIZONTAL

POSITION

. '"HORIZONTAL SYNC

VIDEO SIGNAL

INPUT TERMINAL

AC

CORO

- 6 -

(

..

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.

I

ADJUSTING THE DISPLAY

;

1. H. SIZE
If the horizontal size

of

the screen image

is

too short or too long. adjust the

H.

SIZE

control for

the correct

size.

(See illustration

1.)

2.

V.

SIZE

If the vertical

size

of

the screen image

is

too short or too long, adjust

theY.

SIZE

control for the

correct size.

(See

illustration

2.1

.'

3. H.

POSt

If the screen image shifts horizontally. adjust the H.

pas!.

control for a correct image.

(See

illustra-

tion

3.)

.

4.

V.

POSI.

·If the

scree~image

shifts vertically, adjust the

V.

POSI.

control for a correct image.

(See

illustration

3.1

5. H. HOLD

If the screen image has horizontal stripes or if

the.

image moves left or right, adjust the

H.

HOLD

control for a clear stable image.

(See

illustration

4.1

6,

V.

HOLD ,

If the screen image moves or overlaps vertically, adjust the V. HOLD control for

astable

image.

(See

illustration

4,1

7.

FOCUS

Adjust the focus· for the sharpest image.

(See

illustration

6.1

8. V. LIN.

Adjust the

y.LlN

control so

the

height of characters

is

even over the whole screen.

(See

illustration

7.1

9.

CONTRAST

Turning

the.

CONTRAST control clockwise increases the contrast, turning it counterclockwise

. decreases the contrast.

10.

BRIGHT

Turni'ng the

iRIGHT

control clockWise

makes

the screen brighter, turning it counterclockwise makes

it darker.

11.

SUB-CONTRAST

To adjust the subcontrast, display a screen of characters then turn the

BRIGHT

control to the

clic~

stop position, and the CONTRAST control fully clockwise.

Now

adjust the SUB-CONTRAST control

(VR

140) to the position just before the characters ·become saturated

..

12.

H. CENTER

To adjust horizontal centering turn the

BRIGHT

and the CONTRAST controls fully clockwise with

nothing displayed on the screen. Then adjust the

H.

CENTER

VR

(R742) so that the raster

is

centered

on the screen.

-

7-

13.

SIDE-pee

Depending on computer models with which display monitors
are connected, pincushion or

barre'!

distortion appears on the

right and left edge portions of their screen areas

as

shown

in

Fig. 1..

The distortion

on

the right and left screen portions

can

be

minimized by turning the "SIDE-PCC" potentiometer,
clockwise or counter-clockwise, for optimum distortion­correction results.

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