Tatung Omniscan series User manual

Service Manual

COLOR

MONITOR

OMNISCAN

SERIES

CM17MBDjH/R

CIYI20MBDjHjR

-

CTATUN&

-------

TABLE

OF

CONTENTS

1.

G

EN

ERAL

----------------~-----------------------------------------------------------------------------

1-1

1.1

SAFETY ------------------------------------------------------------------------------------------------------------------

1-1

1.2 SPE

CI

FI

CA

TI

0 NS ----------------------------------------------------------------------------------------------------

1-1

1.3

CONTROLS ------------------------------------------------------------------------------------------------------------ 1-3

1.4

MAKI

NG

CONN

ECTI

0

NS

---------------------------------------------------------------------------------------- 1-5

2.

ADJU

STM

ENT

--------------------------------------------------------------------------~-------------

2-1

3.

CI

RC

UIT DESCRIPTION --------------------------------------------------------------------------

3-1

4.

FLOW CHART ----------------------------------------------------------------------------------------

4-1

5.

SIG

NAL IDENTIFICATION TABLE --------------------------------------------------------------

5-1

6.

TROUB

LE

SHOOTING------------------------------------------------------------------------------

6-1

7.

REPLACEMENT

PARTS

LIST

---------------~----------------------------------------------------

7-1

8.

PCB LAYOUT ----------------------------------------------------------------------------------------

8-1

9.

ASSEMBLY METHODES --------------------------------------------------------------------------

9-1

10.

CI

RCU

IT

DIAG

RAM

S--------------------------------------------------------------------------------10-1

= 1-0 =

1.

GENERAL

1.1

SAFETY

WARNING:

DANGEROUS VOLTAGE

ARE

PRESENT

IN

THIS CIRCUIT

WHENEVER

POWER

IS

CONNECTED

TO

THE CIR-

CUIT BOARDS,

EVEN

THOUGH

THE

PRODUCT

POWER

SWITCH MAY

BE

IN THE 'OFF' POSITION.

PROPER

SAFETY PRECAUTIONS MUST

BE

TAKEN

TO

ENSURE

THE

SAFETY OF PERSONS WORKING ON THE

BOARDS.

POTENTIOMETER ADJUSTMENTS:

R481, R626,

R818,

R640,

R211

SHOULD

BE

ADJUSTED

TO

CORRECT

POSITION DURING FUNCTIONAL

TEST.

1.2 SPECIFICATIONS

17" SPECIFICATIONS

Picture Tube

Resolution

Display Colors

*Display Area

Video Input

Video Bandwidth

Scanning Frequency

Sync. Input Form

Applications

Power Input

Power Consumption

Weight

Dimension

(W

/0

base)

Safe

Standard

EMI Standard

Standard Accessory

Optional Accessory

Recommended

Ambience

17

inch

(16V),

Dark Tinted, Anti-Glare,

.0.28/0.31 mm

dot

pitch (option)

90

degree deflection.

(Dynamic focus/Single focus option)

640

x

350

(min.), up

to

1280 x

1024

(max.)

unlimited

290

mm x 218 mm (typical)

Analog-RGB (positive)

BNC:

100

MHz

D-SUB:

70

MHz

Vertical: 50Hz to 90Hz (Automatic)

Horizontal: 29KHz to 66KHz (Automatic)

Separate Sync.

Sync. on green

Composite Sync.

VGA,

XGA,

8514A,

PGC,

MACII

CAD

/CAM, Workstation, etc.

Switch Selectable

AC

100

to

125V (60Hz)

AC 200 to 240V (50Hz)

120W (max.)

21.5KG/24.5KG (N.W.jG.W.)

411

x 380 x 480 mm

(W/H/D)

UL/CSA, TUV Optional

FCC

Class A model,

Fh:

29KHz

to

66KHz

FCC

Class B model,

Fh:

29KHz

to

62KHz (Class

B)

Fh:

63KHz

to

66KHz (Class

A)

FTZ Optional

Tilt/Swivel Base

(47

mm height)

0-15 pin to Mini 0-15 pin signal cable.

Power cord

signal cables (BNC)

Operating Temperature: + 0 to +35 degree

C,

Storage Temperature:

Humidity: -

20

to

+

60

degree

C,

10% to

80

%

(32

to

95

degree

F)

(-4

to

140

degree

F)

* Approximate only. Active display area depends on actual signal timing.

* Specifications subject

to

change without notice.

= 1-1 =

20" SPECIFICATIONS

Picture Tube

Resolution

Display Colors

*Display Area

Video Input

Video Bandwidth

Scanning Frequency

Sync.

Input Form

Applications

Power Input

Power Consumption

Weight

Dimension

0N

/0

base)

Safe

Standard

EM! Standard

Standard Accessory

Optional Accessory

Recommended

Ambience

20

inch

(19V),

Dark Tinted, Anti-Glare,

0.31

mm

dot pitch

90

degree deflection.

(Dynamic focus/Single focus option)

640

x

350

(min.), up to

1280

x

1024

(max.)

unlimited

350

mm

x

262

mm

(typical)

Analog-RGB (positive)

BNC:

100

MHz

D-SUB:

70

MHz

Vertical:

Horizontal:

50Hz to 90Hz (Automatic)

29KHz

to

66KHz

(Automatic)

Separate Sync.

Sync.

on

green

Composite Sync.

VGA,

XGA,

8514A,

PGC,

MACI!

CAD/CAM, Workstation, etc.

Switch Selectable

AC

100

to

125V

(60Hz)

AC

200

to

240V

(50Hz)

135W

(max.)

28.5KG/32.6KG (N.W./G.W.)

480

x

420

x

540

mm

(W

/H/D)

UL/CSA,

TUV

Optional

FCC

Class A model,

Fh:

29KHz

to 66KHz

FCC

Class B model,

Fh:

29KHz

to 62KHz (Class

B)

Fh:

63KHz

to 66KHz (Class

A)

FTZ

Optional

Tilt/Swivel

Base

(47

mm

height)

0-15 pin

to

Mini 0-15 pin signal cable.

Power cord

signal cables (BNe)

Operating Temperature: + 0 to +35 degree

C,

(32

to

95

degree

F)

Storage Temperature:

-20

to +60 degree

C,

(-4

to

140

degree

F)

Humidity:

10%

to

80

%

* Approximate only. Active display area depends on actual

Signal

timing.

* Specifications subject to change without notice.

1-2 =

1.3 CONTROLS

17"

FRONT{REAR PANEL CONTROLS

f.

II

fi!iiil

-I

Push open

"'tn

..

"'0. ..e-

..

~

-0·

:3

-----

..

0.

8.

V.

SIZE'

6.

V.

PO

SITION-

7.

H.

SIZE-

1.

POWER

LED

.

..

•

l:!:t

2. POWER SWITCH

~4.

SRI

GHTNESS CONTROL

3.

C

ONTRAST CONTROL

lb.d

@o5l

E

I

9.

11. MEM

10. MODE

DPC

ORY

RECALL

SWITCH

5.

H.

POSITION

Front Panel Controls

3.

DEG]!'USSING SWITCH

I!-+~;+---~

n

LJ

./

1.

115V/230V SWITCH

-lJ--.j..g~--I::;:;--t--------l

2.

POWER INPUT

~4--:~~+

'H+-I--+-+-l+-

4.

BNC INPUT

CONNECTOR

7.

SYNC.

SW.

6.

SIGNAL VOLTAGE SWITCH

5. D-SUB CONNECTOR

5.

MINI D-SUB CONNECTOR

Rear Panel Control

1-3 =

20" FRONT{REAR PANEL CONTROLS

r=::::J

I

"1l I

I

6.

V.

POSITION

7.

H. SIZE

--

1.

POWER LED

I

'£

t::2.

2.

POWER SWITCH

J 3. CONTRAST CONTROL

\

4.

BRIGHTNESS CONTROL

I PUSH OPEN

E11.

MEMORYRECALL

10.

MODE

SWITCH

9.

DPC

L--

______

5.

H.

POSITION

Front Panel Controls

1.

115V/230V SWITCH

2.

POWER INPUT

DEGAUSSING SWITCH

1'0

0

~

r-L.

>-:::

~

D

r'O

6~""

~

~\~

1 t

Rear Panel Control

1-4 =

a/)

y

-

f\t--

......

c"":::!

~

I

6.

5.

4.

BNC

INPUT

CONNECTOR

7.

SYNC.

SW.

SIGNAL VOLTAGE SWITCH

D-SUB CONNECTOR

5.

MINI D-SUB CONNECTOR

1.4

MAKING

CONNECTIONS

(1

)

IBM PC

Signal cable

(2)

Apple Macintosh

LC

/

Signal cable

(3)

Apple Macintosh

II

(SYNC. SW.)

ON

D

~--------......I

D.

SUB

(SYNC. SW.)

ON

D.SUB

D

~

_______

--J

MINI

(SYNC.

sw.)

ON

D.SUB

D

~

_______

---I

MINI

D.

SUB

= 1-5 =

(4)

Other computers SYNC.

SW.

)

( ON D

CABLEx4

(5)

Other computers SYNC.

SW.)

( ON D

R

G

Signal cable B

H

v

CABLEx5

(6)

Workstation SYNC. SW.)

( OFF

D

Signal cable R

G+SYNC.

CABLEx3

B

= 1-6 =

BNC CONNECTIONS & CABLE PIN ASSIGNMENTS

BNC

Connections

R

CONNECTOR

R

G(jSYNC.)

B

H/HV

V

REMARKS:

G(jSYNC.)

SYNC.

ON

GREEN

RED

GREEN

& SYNC.

BLUE

B

H/HV

COMPOSITE SYNC.

RED

GREEN

BLUE

H+V

SYNC.

1.

VIDEO SIGNAL LEVEL

IS

0.7/1.0 Vp-p (SELECTABLE).

SYNC. SIGNAL LEVEL

IS

TTL.

2.

"-"

MEANS NO CONNECTION.

= 1-7 =

v

SEPARATE SYNC.

RED

GREEN

BLUE

H

V

D-SUB 15 PIN

MINI D-SUB 15 PIN

SIGNAL CABLE PIN ASSIGNMENTS

SIGNAL

NO.

FOR

NO.

FOR

D-SUB

15

MIN D-SUB 15

(MAC

II)

01GA/8514A)

RED

2 1

GREEN/SYNC. ON

GREEN

5 2

BLUE 9 3

H

SYNC./H+V

SYNC. 7

13

V SYNC.jV MODE 8

14

GROUND 1 4 6

11

13

14

467

8

10

11

OPEN

3

10

12 15

5 9

12 15

= 1-8 =

TABLE OF

CONTENTS

2.

ADJUSTMENT PROCEDU

RE

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

2-1

2.0

STANDARD

ADJUSTMENT CONDITIONS ------------------------------------------------------------------

2-1

2.1

PRE-ADJUSTMENT

OF

POWER

SUPPLY

(PWB-1641)

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

2-1

2.2

PRE-ADJUSTMENT

OF

MICRO

BOARD

(PWB-1697

-2)

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

2-1

2.3

PRE-ADJUSTMENT

OF

MAl

N

BOARD

(PWB-1640

/1701) ----------------------------------------------

2-2

2.4

MAl

N

BOAR

D (PWB-1640/1

701)

ADJ

U

STM

ENT

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

2-2

2.5

SCREEN

POSITION,

SIZE

DPC,

DIGITAL

CONTROL --------------------------------------------------

2-3

2.6

VI

D

EO

AM

P

LlTU

DE

ADJ

U

STM

ENT

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

2-3

2.7

GAIN

ADJUSTMENT ------------------------------------------------------------------------------------------------ 2-4

2.8

CUT

OFF

ADJUSTMENT ------------------------------------------------------------------------------------------

2-4

2.9

CUT

OFF

FINE

ADJUSTMENT 1--------------------------------------------------------------------------------

2-4

2.10

CUT

OFF

FINE ADJUSTMENT 2--------------------------------------------------------------------------------

2-5

2.11

BACKGROUND LUMINANCE ADJUSTMENT --------------------------------------------------------------

2-5

2.12 FOCUS ADJUSTMENT----------------------------------------------------------------------------------------------

2-5

2.13 PURITY ADJUSTMENT --------------------------------------------------------------------------------------------

2-5

2.14 CONVERGENCE ADJUSTMENT --------------------------------------------------------------------------------

2-6

2.15

TI

MING

CHARTS

------------------------------------------------------------------------------------------------------ 2-7

2.16 ADJUSTMENT SIGNAL

AND

TIMING ------------------------------------------------------------------------

2-8

2.17

SET

THE

USER

SWITCH

BEFORE

PACKING

-------------------------------------------------------------- 2-9

= 2-0 =

2.

ADJUSTMENT

PROCEDURE

2.0 Standard Adjustment Conditions

A.

Power supply voltage:

AC

110V,

60Hz.

B.

Warm up time:

The

display must

be

on for at least

20

minutes

before starting alignments.

This

is

especially critical in color temperature

and white balance adjustments.

C.

Instrument: CHROMA-2000 or similar

PATTERN

GENERATOR

D.

Setting:

(G+Sync.) Sync. Switch OFF (signal 86/88/89)

(H/V) Sync. Switch

ON

(signaI81/82/83/84/87)

(H

+

V)

Sync. Switch

ON

(signal

85)

*

When

G+Sync. output, simultaneously output a

H/V

to the

H.

Sync. line,

so

the Sync. Switch

should set at "OFF". (Refer

2.15)

Signal

Level

switch

0.7V

Contrast Control

Max.

Brightness Control

Max.

E.

Signals

Video: Analog 0.7 Vp-p,

75

ohm

Analog sync. on green

Video:

O.7Vp-p

Sync.: 0.3Vp-p

Sync.: TTL level NEGATIVE/POSITIVE polarity

Separate/Composite

(Refer

2.15).

(T

erminated resistor 1 Kohm)

Scanning Freq.: H 29KHz -65KHz

V 45Hz - 1

DO

Hz

2.1

Pre-Adjustment

of

POWER SUPPLY

(PWB-1641)

A.

The

POWER

SELECTOR

SW.

is

connected to

A of PWB-1641, for the different line source

input.

ALA

UL/CSA

AC

115V

SHORT

HONG KONG/EUROPEAN

(TUV)

AC

230V

OPEN

B.

Connect the Dummy Load Resistor with the

proper rating values shown below.

C.

Set

R818

to minimum position (fully clockwise,

viewed from component side).

4

3

2

R1

R2

R3

616

258

18.2

ohm/50W (approx.)

ohm/25W (approx.)

ohm/35W (approx.)

D.

Adjust

R818

(24V

ADJ.) so that the voltage on

2 of

P802

is

as

shown below,

TOSHIBA

17"

HITACHI 17"/20"

NEC

17"

TUBE

TUBE TUBE

2 24.5V

616

258

T80l

P8l8

D

24V

~DJ.

POWER

SUPPLY BOARD

PWB-1641

TOP

VIEW

24V

~

P803

0801

r:::::=:J

A

ca05

o

C806

A

o

2.2 Pre-Adjustment

of

MICRO BOARD

(PWB-1697-2)

+

12V

Adjustment

A.

Apply

24V

dc

voltage to

7 of

P5D1.

24V

1l0VlSHOPT

220V20PEN

B.

Adjust

R556

(12V

ADJ.)

so that the voltage on

C503

is

12V

(+/-

0.1V).

C.

Check the voltage on C514 or

R558

is 5.0V (+

/-

0.25V).

= 2-1 =

P!504

P!5OZ

10000001

6 , "

~,

T~47C:;v.N

~'

Os

C514~

PW9-1697-2

TOP

VIEW /

MICRO

BOARD

~

R556

~

P~56

IZV-J

0

lZV

ADJ.

o

Q.'

2.3 Pre-Adjustment

of

MAIN PCB

(PWB-1640/1701)

+12V

(R211)

Adjustment

A.

Apply signal

89

(64KHz).

full white pattern.

B.

Adjust

R211

so

that the voltage

on

4 of

P201

(or +12V test

Pin)

is

12V.

C.

Check the

DC

voltage

on

3 of

P201

is

5.98V

to

6.04V.

TP4'

o

0401

OGZO

0

11343

ope

MJJ.

020?

0207 0

BCJE

II

HEAT

SINK

1-1

PlOI

R311

V.LIN~

o

fgl3

lQll

R314

V.SIZt:

o

+16~

Rt2S

R640

o 0 0

H.V.AD.1.

H.Y.

nos

1'203

~4

~~~~

o 1'204 PZ02

P211

tl2V

N1"J.

P403

10

01

,,481

] 0

H.SIZE

PPES!rl

04(0

8

HEAT

stN!<

PWB-

1640

TOP

VIEW

MAIN

BOARD

PROTEan

ON

!>OJ.

2.4 MAIN BOARD (PWB-1640/1701)ADJUSTMENT

(1)

Horizontal Hold (R422/R413/R420)

A.

Short between

T4

and

GROUND

(with 0.1uf/50V

capacitor).

B.

Apply signal

89

(64KHz)

and

adjust

H.

hold 3

R422

so that the entire picture appears.

C.

Apply signal

88

(48KHz)

and

adjust

H.

hold 2

R413

so that the entire picture appears.

D.

Apply signal

80

(28KHz)

and adjust

H.

hold 1

R420

so that the entire picture appears.

NOTE:

ALIGNMENT

PROCEDURE

64KHz

----->

48KHz

----->

28KHz

(R422) (R413)

(R420)

(2)

H.

V.

ADJ.

(R626)

A.

Brightness control and contrast control

set

at

fully clockwise (maximum).

B.

Apply signal

89

(64KHz),

FULL

WHITE

pattern.

C.

Adjust

R626

so

that high voltage

is

26KV.

(3)

H.

V.

Protection

(R640)

A.

Apply signal

89

(64KHz),

FULL

WHITE

pattern.

B.

Adjust R626 so that protection voltage

is

7.7V-7.8V.

C.

Check the protection function:

Short

T1

and

T2,

the output (high voltage)

should shut down. Open the "short" and power

on again, the high voltage will back to normal.

(4)

Horizontal Raster Centering

A.

Apply signal

89

(64KHz).

B.

If necessary, adjust the brightness control

so

that the raster

is

faintly illuminated.

C.

If necessary, press the width control (5501/

5502)

so

that both edges of the horizontal raster

can be

seen.

D.

Select

P202,

P203

or

P204

(either

end

of the

plug), until the raster

is

centered

on

the screen.

(5)

Horizontal Width pre-setting

(R481)

A.

Apply

Signal

89

(64KHz).

B.

Adjust

H.

SIZE

control 5502 to get minimum

width on the screen.

C.

Adjust

R481

so that the voltage on

TP41

is

Va

(see

table).

D.

Check the collector voltage of

Q410

is

16.5V

(+/

-

0.5V).

E.

Adjust

H.

SIZE

control

5501

to get maximum

width on the screen.

= 2-2 =

F.

Check the collector voltage of 0410

is

20V

(+

/-

1V),

check the voltage on

TP41

is

Vb

(+

/-

5V).

17" TOSHIBA 17" HITACHI 17" NEC 20" HITACHI

M41KJF26XX12 M41KKL80X-12 M41KMG23XX

M48KAY80X01

M41KMK26XX12

Va

Vb

122V

143.5V

95V

112.5V

124V

144.7V

114V

133.0V

*

With

the different

CRT

or

YOKE

the voltage of

Va/Vb should

set

at the correct

value.

If it

is

not

correct setting, it may damage the output circuit

or lack of the enough width.

(6)

Vertical size pre-set

(R314)

A.

Apply signal

84

(35KHz),

crosshatch pattern.

B.

Adjust

V.

SIZE

control

S505

to maximum.

C.

Adjust

V.

SIZE

pre-set

R314

so

the

vertical height

is

reach to the following

values.

235

(+/-7)mm

278

(+

/-

3)mm

(7)

Vertical Linearity

(R311)

A.

Apply signal

89

(64KHz),

crosshatch pattern.

B.

Adjust

size

control S506/S507

so

that the

vertical

size

is

approximately

(17":

218mm,

20":

262mm).

C.

Adjust

R311

so

that vertical linearity

is

optimum.

(8)

Side Pincushion (R343)

A.

Apply signal

83

(VGA480),

crosshatch pattern.

B.

Adjust

V.

Size

control S506/S507

so

that the

vertical

size

is

(17":

218mm,

20":

262mm)

approximately.

C.

Adjust

H.

size

control S501/S502

so

that the

horizontal

size

is

(17":

290mm,

20":

350mm)

approximately.

D.

Adjust

DPC

control

S513

to minimum.

E.

Adjust

DPC

pre-set

R343

so

that the minimum

CONCAVE

is

2mm to 2.5mm (measure to the

straight line).

F.

Check the maximum

BARREL.

The

value

is

greater than 0.5mm when

DPC

control

S512

set

to maximum (Apply

8514

signal).

2.5 Screen Position, Size, Side Pin Cushion,

Digital control

HOW

TO

PROCEED

THE

FACTORY

SETTING?

A.

PUSHING

THE

FACTORY

SETTING

SW.

WITH

TIP

THINGS

AND

POWER

ON

FOR

2

SECONDS

THEN

RELEASE

THE

PUSHING.

*

The

FACTORY

SETTING

SW.

is

in

side the

control cover (the first hole of the right side.)

B.

During the setting (change

MODE)

or leave

setting for 4 seconds the data will be

saved

into

the memory automatically.

C.

After 4 seconds later, switch off the power

and

power

on

again, the data stored inside the

memory will

be

the factory setting data.

D.

The

data could

be

retrieved by pushing the

MEMORY

RECALL

Sw. (Second hole of the right

side)

E.

If more than one signal requires readjustment,

please repeat steps

(A)

through

(C).

* For signal 1 to 9, check that the screen position

and

size

fall

within the following limits.

(1)

Screen Size

IT

20"

Horizontal 290(+

/-

5)mm

350(+/-

5)mm

(MAC-II) 280(+

/-

8)MM

340(+/-

8)MM

Vertical 218(+

/-

5)mm

262

(+

/-

5)mm

(MAC-II)

210(+/-8)MM

255(+/-

8)MM

Screen Position

Space between

bezel

picture

Top

and

bottom space difference: +

/-5mm

Right

and

left space difference: +

/-5mm

(2)

Side Pin Cushion

A.

Apply crosshatch pattern.

B.

Check to if the side pin cushion distortion

is

within +

1,

-2

mm.

2.6 Video Amplitude Adjustment

* Check to make

sure

the video input signal

is

set

at the following

level.

A.

Video: Analog

O.7Vp-p

(75

ohm), not include the

sync. signal.

B.

Sync.

Switch:

OFF

C.

Signal:

89

(64KHz),

crosshatch.

D.

Initial Settings of Adjustment

VRs.

R72t: Contrast

VR

fully clockwise

R722: Brightness

VR

fully counterclockwise

R032,

R092,

R152:

GAIN 1

VR

Mid'POINT

R081

,

R141:

GAIN 2

VR

Mid'POINT

SCREEN

VR

Mid'POINT

2-3 =

2.7 Gain

adjustment

A.

Adjust R032(R),

R092

(G)

, R152(B) so that the

terminals (Pins 1

of

P901,

POO2,

P903) on the

CRT

PWB

are each set

to

47Vp-p not including

the clamp pulse.)

* Please use the plastic adjusting pole

to

do

the

alignment.

R G B

[§]l

'00'

~

[§]l

~o

,,,.~

l22l

~

0

""

~

RCI

0

R043

RI19

01

Gel

P179 31

Bel

R044 RIOS

RI04

PWB-

1642

TOP

VIEW

VIDEO

BOARD

ROB

I

Ge'Z

o

RI63

RI64

RI41

002.

o

D£,D£,D£,

.

RDI

GOI

BOI

---------~c!arrp

pulse

is

]~~~~~-

not

I

nc

I

uded

2.8

Cut-off

adjustment

A.

Initial setting of the adjustment

VRs.

Rl19,

R179:

CUTOFF 2

VR

MID'POINT

R058,

Rl18,

R178:

CUTOFF 1

VA

MID'POINT

R722:

Brightness

VR

fully clockwise

SCREEN

VA:

fully counterclockwise

B.

Apply signal 89 (64KHz), crosshatch pattern.

C.

Adjust

G1

control

ROO7

(PWB-1642-3) so that the

voltage on

Gl

is Vc (See Table).

17"

TOSHIBA

17"

HITACHI 17" NEC

20"

HITACHI

M41KJF26XX12 M41KKL80X-12 M41KMG23XX

M48KAY80X01

M41KMK26XX12

Vc

-90V

-60V

-OOV

-70V

290.5

~

+

GI

R907

o

PWB-1642

DRIVE

BOAPD

D.

As SCREEN

VR

is gradually turned clockwise, a

signal color will appear. Turn the CUTOFF 1

VR

fully counterclockwise for this color.

E.

Again, turn

SCREEN

VR

clockwise gradually, a

signal color will appear again. This color

is

the

reference color for the cut off adjustment. Set

the

background

color

faintly appears with

SCREEN

VR.

Use this as your reference then

adjust the other

two

CUTOFF

VRs

(other than

the reference color)

to

form a white background.

F.

Measure the color temperature Xand

Y.

NOTE:

X =

281

(+

/-

5)

Y =

311

(+/-

5)

* White tracking will be best at dark cut off

adjustment settings. For the best setting,

therefore, perform the cut off adjustment in.

as

dark a place as possible.

2.9 .

Contrast

Tracking

1

A.

Apply signal 89 (64KHz), full white pattern.

B.

Initial Settings of Adjustment

VRs.

R721:

R722:

R081,

R141:

Contrast

VR

Brightness

VR

GAIN 2

VR

fully clockwise

MID'POINT

C.

Adjust R GAIN 1

VR

(R032) and B GAIN 1

VR

(R152).

D.

Measure the color temperature X and

Y.

X =

281

(+/-

5)

Y =

311

(+/-

5)

= 2-4 =

2.10

Contrast

Tracking

2

A.

Apply signal 89 (64KHz), full white pattern.

B.

Initial Settings

of

Adjustment

VRs.

R721: Contrast

VR

Adjust

to

obtain 3FL.

R722: Brightness

VR

MIO'POINT

C.

Adjust G GAIN 2

VR

(R081)

and B GAIN 2

VR

(R141).

D.

Measure the color temperature X and

Y.

X =

281

(+

/-

5)

Y =

311

(+/-

5)

E.

Check the color temperature X and Y between

the following condition:

X=281

(+/-15)

Y=311

(+/-15)

(1)

Brightness MID'POINT., Contrast

MAX.

(2)

Brightness MID'POINT., Contrast

Adjust

to

obtain > 5

FL

2.11

Background

Luminance

Adjustment

A.

Initial setting of the adjustment

VRs.

R722:

R721

: Brightness

VR

Contrast

VR

MID'POINT

MIN.

B.

Apply sign'al 89 (64KHz), crosshatch pattern.

C.

Adjust SCREEN

VR

so that the background just

disappear.

2.12

Focus

Adjustment

(1)

Single Focus

(TOSHIBA

Tube)

A.

Apply signal 89 (64KHz), crosshatch pattern.

B.

Initial setting of the adjustment

VRs.

R722:

R721:

Brightness

VR

Contrast

VR

MID'POINT

MAX.

C,

Or receive the pattern with

"e"

character.

D.

Adjust the FBT focus

VR

to achieve the best

focus at an intermediated point between the

center of the screen and the corner.

r-

~

I-

Best

focused

~

1'""

t

./

(2)

Double Focus (NEC/HITACHI Tube)

A.

Apply signal 89 (64KHz), crosshatch pattern.

B.

Initial setting of the adjustment

VRs.

R722:

R721:

Brightness

VR

Contrast

VR

MIO'POINT

MAX.

C.

Or receive the pattern with

"e"

character.

D.

Focus

1:

Should be adjusted so that the vertical lines

become narrowest

in

all over the screen.

E.

Focus

2:

Should be adjusted so that the horizontal lines

become narrowest

in

all over the screen.

F.

Repeat the adjustment procedure

in

step 0 & E

until the vertical and horizontal lines are all clear

at center and corner of screen.

0

Best

focused

v-.

-

I'-'

-

2.13

Purity

Adjustment

A.

Be

sure the display is not being exposed

to

any

external magnetic fields.

B.

Ensure that the spacing between the Purity

Convergence Magnet (PCM) assembly and the

CRT

stem is 29mm

(+/-1mm).

C.

Produce a complete red pattern on the screen.

= 2-5 =

D.

Adjust the purity magnet rings on the

PCM

assembly

to

obtain a complete field of the color

red~

This is done by moving the two tabs

in

suCh

a manner that they advance

in

an opposite

direction but at the

same

time to obtain the same

angle between the two tabs, which should

be

approximately

180

degrees.

F.

Check the complete blue and complete green

patterns to observe their respective color purity.

Repeat steps A

to

0 if needed.

R.B Static Convergence

r----purity

_9n~h

Lock Ring

(Tum

coun~rdockwi'"

to

unlock

Convergence

& Purity M:IIgnet.l

Clamp

for

Convergence

&

purity

Magnet

"-pol.

",,~ut.

!!'at!

10

91:1

COII\'''~'''")

11

6

-,01&

=,~.!a

(C?,.er.

I,

We<;.~:=

C~~

..

:;e~c.)

pidur.

Tabe

2.14 Convergence Adjustment

* Before adjustment convergence,the vertical

size,

linearity and focus adjustment must completed.

* Make sure the Purity

is

good before the following

adjustment.

A.

Apply signal

89

(64

KHz),

crosshatch pattern

(pattern

2).

B.

The

brightness level should be no higher than

necessary

to

obtain a clear pattern.

C.

Loosen the convergence magnet lock ring,

converge the

RED

and

BLUE

lines at the center

of

the screen

by

rotating the

R-B

static

Convergence Magent.

D.

Align the converged RED/BLUE lines with the

GREEN

lines at the center

of

the screen by

rotating the (R/B)-G Static Convergence Magnet.

E.

Tighten the convergence magnet lock ring.

F.

Remove

the

IY

wedges and slightly tilt (do not

rotate) the deflection yoke horizontally and

vertically

to

obtain good overall convergence.

G.

Secure the deflection yoke by re-inserting the

wedges.

H.

Check convergence and Purity. If purity error

is

found.

Please

repeat the purity adjustment.

B/RG

I

~:r!11'!'nl~1

r~!»r!:-'I~b~~

'ynellle.cul

- - - _

~

-

.L

__

:/1'

I

pari

....

th.

",dj

..

"..... 1

by

0,

..

1.9

I

Ihe

ongl.

b.I

......

Ih.

loh.

I

Gro

••

I.

~&9cnl.

CA"YII,

••

Ct

(nil.)

per/arm

Ih.

cdjUJI"..,ftl

by

,pI.lnq

thl

ongl.

b.I

......

Ihe

lab

••

I

8-----1

R----,...1-:..---

per

for",

t)e

odlusl

.....

"t

by

'yllck,oftOUI

rolali

..

af

thl

I

...

Jobs.

RId

la

BI

••

Canwlr9'.c,

(Mogulo)

..

~

I

= 2-6 =

2.15 Timing Charts

HORIZONTAL

VERTICAL

HORIZONTAL

VERTICAL

HORIZONTAL

VERTICAL

SEPARATE SYNC.

--u

~I.

I~

B

/.

0

.1.

YlOEO

o

YlOEO

R

U

J

u,.----

o J Sync. Polarity : Positive/Negative

COMPOSITE SYNC.

I

VlOEO

I

/","C.I.

0

.I.E~I

12·S

rJ

A

~

Sync. Polarity : Positive/Negative

COMPOSITE SYNC. & VIDEO (SYNC.

ON

GREEN)

V:OEO

o

A

= 2-7 =

2.16 Adjustment Signal and Timing

Adjustment signals (Nos. 1-9 : Preset Signals)

Sync. Polarity

No. Timing Signal SYNC. Hor. Vert.

1.

81

VGA 350

HjV

+

2.

82 VGA 400

HjV

3.

83

VGA 480

HjV

4.

84 8514A

HjV

+ + interlace

5.

85

PGC

H+V

6.

86 MAC-II . G+Sync. #1

7.

87 800X600

(56)

HjV

+j-

8.

88 1024X768

(60)

G+Sync.

9.

89 1280X1024 (60) G+Sync.

10.

77

V.

HOLD

(50)

Fv=50Hz

11.

78

V.

HOLD (90)

Fv=90Hz

12.

80

H.

HOLD

(54)

HjV

Fh=28.4KHz

#1 When G+Sync. output, simultaneously output a

HjV

to

the

H.

Sync. line, so the Sync. Switch should set

at

"OFF".

PRE-SET TIMING

77 78

80

81

82

83

1280X1024 VGA350 VGA400 VGA480

-------

Fh (KHz) 64.000 35.520 28.400 31.500 31.500 31.500

Ajls

15.620 28.150 35.200 31.770 31.770 31.770

BJLs

1.000 3.920 3.840 3.770 3.770 3.770

CJLs

2.000 1.250 4.400 1.890 1.890 1.890

DJLS

11.875 22.800 25.600 25.170 25.170 25.170

EJLS

0.750 0.180 1.360 0.940 0.940 0.940

Fv (Hz) 49.600 90.000 54.000 70.000 70.000 70.000

Oms 20.160 11.111 18.480 14.270 14.270 16.680

Pms 0.080 0.113 0.070 0.064 0.064 0.064

Oms 0.580 0.563 1.162 1.880 1.080 1.020

Rms 19.490 10.426 16.896 11.126 12.716 15.246

Sms 0.020 0.014 0.352 1.200 0.410 0.350

Sync.

G+Sync.

HjV HjV

HjV

HjV HjV

H+V

H + +

V + +

==

2-8

==

84 85

8514A PGC

Fh (KHz) 35.520 30.480

Aj.1.s

28.150 32.800

Bj.1.s

3.920 4.000

Cj.1.s

1.250 2.800

Dj.1.S

22.800 25.600

Ej.1.s

0.180 0.400

Fv (Hz) 87.000 60.000

Oms 11.500 16.670

Pms 0.113 0.070

Oms 0.563 0.790

Rms 10.810 15.740

Sms 0.014 0.070

Sync.

H/V

H+V

INTERLACED

H +

V +

2.17 Set

the

user

switch

before

packing

A.

POWER SELECTOR

SW.

UL/CSA

MODEL

HONG KONG/EUROPEAN (TUV)

B.

CONTRAST

VR

C.

BRIGHTNESS

VR

D.

SIGNAL LEVEL

SW.

E.

SYNC.

Sw.

F.

MODE

Sw.

86

MACII

35.000

28.570

2.100

3.200

21.500

2.100

67.000

15.000

0.086

1.120

13.700

0.086

G+Sync.

AC

115V

AC 230V

87

800X600

(56)

35.160

28.440

2.000

3.560

22.220

0.670

56.000

17.780

0.060

0.600

17.070

0.030

HjV

+

Fully clockwise (MAX.)

MID'POINT

0.7V

ON

OFF

= 2-9 =

88 89

1024x768 1280X1024

(60) (60)

48.370 64 .000

20.675 15.620

1.000 1.000

2.957 2.000

15.950 11.875

0.750 0.750

60.500 60.000

16.520 16.670

0.080 0.080

0.540 0.580

15.880 16.000

0.020 0.020

G+Sync.

Tatung OMNISCAN SERIES User manual

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