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Document:	VT240 Series Pocket Service Guide
Order Number:	EK-VT240-PS
Revision:	001
Pages:	116
Original Filename:

OCR Text

LRER

1200,
Pocket Service Guide

EK-VT240-PS-001

VT 240.....
Pocket Service Guide

Digital Equipment Corporation

lst Edition,

January 1984

Rights

Reserved

The
reproduction
of
this material,
in
part or whole,
is strictly prohibited.
For
copy
Educational
Equipment

1information,
<contact
the
Services Department, Digital
Corporation,
Maynard,

Massachusetts

@1754.

The
information
in
this
document
1is
subject to change without notice. Digital
Equipment
Corporation
assumes
no
responsibility
for
any errors that may
appear

this

document.

Printed

The following
Equipment

U.S.A.

are trademarks
Corporation,

Digital
Maynard,

Massachusetts.

dlilg|i]t]all

DECwriter

RSTS

DEC
DECsystem-10

DIBOL
MASSBUS

RSX
UNIBUS

DECSYSTEM-20

PDP

VAX

DECUS
DECmate
DECnet

P/0OS
Professional
Rainbow

VMS
VT
Work Processor

CONTENTS
INTRODUCTION
Purpose

"Product

Tools

TN O

Required

O
L

e
B

A
T

R
R

JEE DN T

N
RN

NN IR RN

TN JEE NN

NN TN UK RN

DN RN BN

RN RN

TR TEE RN

N
T

RN RN N

TR E

vili
vii
viii

EE R

)

L
I

TESTING AND TROUBLESHOOTING

THE VT240

]

Power-up

Self-Test

EIA

Data

Port

Troubleshooting
L

Lines

Loopback

L
N

DEE NN BN

Self-Test

*
&

N -

IS D

BEE BN

SESSH

NN IR

General

System

BOX

VT240@

Series

Top

Power

Integral

~Keyboard

DN DEE

Controller

NN IR

LR I

NS IR

cceeeeeeecasns
Board

Modem

......

.ceceececnsscccnsssssea

Monitor

NN DN

BN DN I

...ceeceececocccos

...civeececesccscosccccas

32
36

Spares

List

..ceee.e

MONITOR ALIGNMENT

.. cceeccrtecestcstsseeense
Removing the Access Cover ......
Monitor Adjustments
&

Brightness
Contrast

NN
N EEEER

Vertical

Linearity

ceeans

....cec..

sieceeccoccccoccscacss

Display Instability ...cccce..
Vertical HOld ..cieeeecen
Horizontal Hold ....cceceeces
Display Centering Adjustments
Yoke Rotation ...ciceececess
Horizontal Centering

iii

]

[

L
N

FOCUS

EEEEEE
T EEE

W N
B
b

=
s
L]

b WWWNNNNNODND
-

Initial ConditionNs ..eeeeecceses
Character Quality «ceeeee..

®
&
®&
L ]

®
s
*

*
L]

General

DN BN DN

Recommended

*®
&
&

W W
Wil

®
&

Supply ChasSiS

Terminal

VIDEO

L I

Cover

.
»
L4
L
*
&

N+

FRU REMOVAL AND REPLACEMENT

TERMINAL

el el aadl o

and

W OO -JO U

NDNDNNDNON

VIDEO

Printer Port External Loopback Self-Test
EIA Port Control Lines Loopback Self-Test
20 mA Port Loopback Self-Test
Integral Modem External Loopback Self-Test
Screen Alignment Test
Printer Problems .U"“O“fl'fl""lflflfl"fiflfi'fl'l
Sel f-Test Error Codes
Troubleshooting Miscellaneous Problems ..

[}

el Sl e

el S

General
Testing

SERIES

W
W

.3.4.3
3.5
»

Vertical
AQPQCt
SET-UP

Centering

Ratig

I N TR DY T O TR B R

O‘M‘Q..\lQU'fi..h’.fi.'l“"fll“"‘fiflO‘fik'fiiy

REFERENCE MATERIAL

DOCUMENTATION

LI I B B B O B B B B B N N O R R

«vvveeeneeneeennesnnannnaans

APPENDIX
.

VT240

APPENDIX

FRU EXPLODED VIEW DRAWINGS «.vvvevenneanennennens 53

APPENDIX

CABLE INFORMATION .............,..,......,..;..;‘

APPENDIX

PHYSICAL FUNCTIONAL DIAGRAM «.ruvevensnvnvnennnn.

APPENDIX

VT240 COLOR

VIDEO MONITOR,

MODEL VR241-A

........

OOSITAUTD

WN R

n WA

‘?tfi) i MEafiimtab;mt§53§cjfimt»quLgk4H

FIGURES
Indication of
Rear

Video

Connector

Successful
Panel

Adjustment

...eeeeconcsas

...cceceeevecoccsncesn

...ciceceeccccecanaess

....cececscescccccccccccsss

Self-TeSt
VT240

LOCAtionNsS

Rotation

MeasurementsS

Vertical

Centering

...cceeeececeesss

Aspect Ratio MeasurementsS ...ceeececccecccccceces
VT240 FRUs (Exploded View)
...ccececccccccssocnossss
.ecccescoceoscccsossscsossascasnnsnses

46
53
D6

Physical Functional Diagram ....cececescccecccess
Screen of Es Alignment Pattern .....ceceeeeeceeses

60
65

Cable

Color

SUMMAYY

Bar

...eeeeeecececcececcsccscacscecssee

VR241-A Monitor Ground Cable ...ceeeecesccoscesss
Monitor Cover RemoOvVal ....cececceccecccnconsncsoecs
Video Sync Adjustments ...cceeceecceccescccsncases

74
15
76

Vertical

Pattern

MeasuUrementsS

....ceceeeececcoccee

Horizontal
Horizontal

Centering AdjustmentsS

Centering Check/Adjustments ...cceeee..
Phase Check/Adjustments ....ccceeeeess

78
79

Rotational

Check

82
83
84
86

Presets

(part

ceceeceecncscacscancescscsscnsces

E-16

Presets

(PaAart

ceeeeccecssccecsscsscsssssssssssssss

E-17

Cutoff Adjustment ....c.cceeeecceveeccccccsccnncess
White Raster Adjustment (part 1)
..c.cceeececcesce.
White Raster Adjustment (part 2) .ceeeecececceessss
White Video Adjustment ...cceeceececcsccccceccacce
Sub-Control Adjustment ......ceceeeescsssscsscsecs

93
94
95
96
98

=
I

- el W
B=3 W N
=N

..iieeeeeeecsccoscssceacccsncscoass

Rectangularity Check ..icieeeeeeecccececcccnecseee
Rectangularity Adjustment .....cccevecececcsccces
Aspect Ratio Check/Adjustment ....c¢cceececeeeceses
Vertical Linearity Adjustment ....ccceceeceveecese.
Focus Adjustment s 5 % B B & B 8 & B & B S R PR
R R R RSP

E-15

E-18
E-19
E-20
E-21

E-22

Power

E-23

E-24

Video Controls and INdicatOrS
Synchronization and Impedance

E-25

Adjustment

CONtrolsS

..cceeececccccesscsnsccsscscssnecse

Locations

100

...ceeecececcecaess
Switch Settings ...

101
102

..cceeeeeeeeccccsscccanccesss

103

ORI

VT240

Self-Test

WNHFNDFRFWN

BEEEEEE QOANF

TABLES

Chart

EXrOr

..t iieeeeeeeeeeeocceoeceeenensns

MESSAJES

s s eeseecccoassonncsccsssscess
Symptom/Solution Troubleshooting Chart ....
Recommended Spares LiSt teueeeeeeeoccesoencoceceees

VT24¢

Interface
Modem
Test

Cables

Control
Pattern

tiiiieeeeeceneneceeeoceccconnsss

SeleCtions
SUMMArY

..uv.eeeeeeeceecccennnnns

....cceeeeoccecacncccccessss

No Video Troubleshooting ProcedUres .......eoe....
Distorted video Troubleshooting Procedures ......

Color Troubleshooting ProcedUresS ..eeeeeeooeosess
Troubleshooting Alignment ProblemsS ..eeeeeeeeess.

Video
White

Alignment CONtrOlS uueeeeeeeoooeseoooesens
Balance Alignment CONtrolsS .ueeeeeeeeeessn.

INTRODUCTION
PURPOSE

This pocket service guide provides the
servicing the VT240 series terminal.
Testing and troubleshooting the
FRU removal and replacement
Video monitor alignment
Related documentation
Cable information
Physical functional diagrams

Notes, Cautions,

field

following

replaceable

information

units

for

(FRU)

and Warnings

Notes, cautions, and warnings appear throughout
service guide. They are defined as follows:

this

Note:

Contains
an
important
message
information you should be aware of.

alerting

Caution:

Contains
information essential
equipment and software.

the

Warning:

Contains
information
personnel.

essential

you

¢to

the

safety

the

pocket

PRODUCT

The

VT240

terminal
terminal

1/4

page,

customer

1installable,

conversational

providing
both
text
and graphics capabilities.
features VT102 and VT125 compatibility.

The VT240
terminal
supports
LK2@1
corporate
keyboard.
monochromatic
12-inch
(305
displaying

rows

text

This

multiple language versions of the
The
VT240
has
an
anti-glare
mm)
monitor
and
1is
capable of
either

80-

132-column

formats.

The ergonomically designed monitor tilt mechanism permits the user
to adjust the screen for optimum viewing comfort. A color monitor
and an integral modem are offered as options. Appendix E provides
information

for

servicing

the VT240

color monitor, model

VR241-A.

The VT240 features three standard interface connectors: The EIA
host port, a 25-pin (EIA RS-232-C and RS-423) male connector, 1is
one method used to connect the terminal to the host computer. The
vii

20 mA host port is another method of connecting the VT240 to the
host computer. This connector is an 8-pin 20 mA female connector.
The printer port, a 9-pin (EIA RS-232-C) male connector, is used
to connect the terminal to a hard-copy printer. The VT240 operates
only on full-duplex asynchronous communication lines.

TOOLS

REQUIRED

The
following
terminal.

tools

are

required

Tool

service

Part

VOM (volt ohmmeter)
Slotted screwdriver,

3/16

Phillips screwdriver, no.
Tuning wand
Video alignment tool
Video alignment template

the

VT240

AR,

Number

29-13510-00
29-10988-00

inch

29-11005-00
29-23189-00
29-23190-00
29-24371-00

CRT screen cleaner
Anode discharge tool

29-24791-00
29-24717-00

VR241 adjustment tool
EIA data loopback connector
Printer port loopback connector

29-24746-00
12-15336-00
29-24795-00

20 mA

79-15503-00

loopback

video

connector

]

viii

TESTING AND TROUBLESHOOTING

SERIES VIDEO TERMINAL

THE VT240
1.1

This

GENERAL

chapter

contains

functions

sel f-test

and

information

the

troubleshoot

the

needed

VT240

Refer to Appendix E if you have a color monitor.

perform

the

terminal.

series

TESTING AND TROUBLESHOOTING

1.2

There are a series of self-tests to help you isolate failures to
the field replaceable units (FRUs). (See Appendix B.) These tests
are designed to address 95% of the VT240's functionality. They are
listed

Table

tests

listed

1-1.

If a test discloses a faulty FRU, adjust or replace the
faulty unit. After adjusting or replacing a FRU, repeat all of the

in Table

1-1

ensure

that

your

operates

terminal

properly.

NOTE

Each self-test forces a RESET of the
Set-Up features back to the
terminal
saved defaults. The prerequisites must
each
invoking
before
Set-Up
be
self-test.

NOTE

IT IS IMPERATIVE THAT THE EIA PORT NOT
BE CONNECTED TO A HOST WHEN INVOKING THE
VT240 SELF-TESTS AND ALIGNMENT PATTERNS.

Table 1-1

Self-test Chart
Sequence

Self-tests

Prerequisites

Power-up self-test

None

(Para.

(Invoked after terminal
is operating)

EIA Port Data Lines
Loopback Self-test

(Para.

Turn terminal
power

1.3)

Power-up self-test

1.4)

® SET-UP

- Local
- VT100

e SET-UP
- Local
e

(See Note)

- VT100

EIA loopback

connector

on.

Once:

ESC [ 4 ; 1 vy
Continuously:
ESC

[

;

Once:
ESC [

;

2 vy

ESC

;

Continuously:
[

;

9 vy

(Cont)

Self-test Chart

Table 1-1

Self-tests

Prerequisites

Printer Port External

e SET-UP

Loopback

(Para.

Self-test

1.5)
@

EIA

Port

Loopback
(Para.

Control

Lines

Self-test

Once:
ESC

[

;

- VT100

Continuously:

Printer port
loopback connector

ESC

SET-UP

Once:

Local

VT100

(See Note)

Local

1.6)

Sequence

EIA

;

ESC [ 4 ; 6 y
Continuously
ESC

loopback

[

;

connector
[

Port

Loopback
(Para.

SET-UP

Self-test

1.7)

Once:

Local

ESC

VT100

Continuously

loopback

connector

Integral

Modem

Loopback

Self-test

(Para.

External

1.8)

Patterns

Screen

[

;

y
;

Once:

Local

ESC

VT100

Continuously:

External

modem

ESC

[

;

Prerequisites

Sequence
(See Note)

ESC

SET-UP
-

Local

VT100

SET-UP

Test

ESC

[

;

columns/line

- Monochrome Display

Graphics Alignment

e SET-UP

Pattern

- Clear

ESC Pp

Display

- Local
- VT100

- 80 columns/line
- Reverse video
- Monochrome Display

NOTE:
Do

The

not

type

spaces

parameters

are

between
spaced

the

parameters

shown

for

P [390,240]
C [200]

any

escape

clarity only.

sequence.

POWER-UP

1.3

SELF-TEST

‘

The power-up self-test checks the terminal's internal memory, the
video circuitry, the keyboard, and makes a partial check of the
communication and printer ports to see if they are operating
properly.

(1)

(2)
(3)

A successful power-up self-test ends when:

the°keybflard LED indicators are off (See Figure 1-1.)

the keyboard generates a bell tone; and
'a "VT240 OK" message enclosed by a rectangle appears on
the screen. (See Figure 1-1.) This message will disappear

from the screen the moment any character except X-ON is
30 minutes
if you 1let
terminal or
received by your

elapse.

Should

error

occur,

check

your

monitor

first.

Your

monitor will display on the screen "VT240" accompanied by an error

message, and your keyboard will generate two bell tones.
messages are defined in Table 1-2. (See Paragraph 1l.11.)

The error

“POWER OK"
" INDICATOR

LED INDICATORS

MA-OB93-83 A

Fiqure

1-1

‘Indication of

Successful

Self-test

Table

1-2

VT240

Error

Messages
LED

Indicators
Error

**NO

Message

Pattern

Corrective

ERROR MESSAGES
ERROR**

000

Replace
board

terminal

controller

ERROR

Replace

terminal

controller

FATAL

**NO

FATAL

MESSAGES

ERROR**

board

Actiont
I,

**NO

ERROR

FATAL

**NO

ERROR**

20011

MESSAGES

9100

MESSAGES

Display

Error

controller

terminal

controller

terminal

controller

Replace
board

terminal

controller

Replace

terminal

controller

terminal

controller

terminal

controller

terminal

controller

terminal

controller

Replace

Replace
board

2101

ERROR**

VT240

terminal

board

ERROR**

ERROR

FATAL

Replace
board

ERROR**

ERROR

FATAL

**NO

go10

ERROR MESSAGES

FATAL

**NO

MESSAGES

Processor

2110

board

VT 240

Printer

Error

VT240

20 mA

Port

2111

Replace
board

Port

Error

1000

Replace
board

VT240

EIA

Error

Port

Data

1000

Replace

board

VT240

EIA

Error

Port

VT240

Keyboard

Control

1001

Replace
board

VT240

Keyboard

Error

Port

XXXX+

XXXX#

VT240

Modem

VT240

Monitor

Error

Plug

keyboard

2.
3.

Replace
Replace
board

keyboard
terminal

Plug

keyboard

Replace

keyboard

Replace
board

terminal
«

1010

See

Modem

1011

Plug

controller

Troubleshoot

VR201

monitor

(LED indicator only)
2. Reverse monitor cable

Table 1-2

VT240 Error Messages (Cont)
LED

Indicators
Error

Message

‘

Pattern

Corrective

3.
VT24@

NVR

Error

1100

Action4

Replace monitor

Replace

cable

terminal

controller

terminal

cantrmller

terminal

controller

board

VT249

Display

Error

VT240

Video

Memory

1101

Replace

board

Error

1110

Replace

To
X

replace
denotes

terminal
varying

controller

LED display.

2 80

board

board,
To

see

Paragraph

2.3.

replace

keybmard

see

Paragraph

NOTE:

on,

off

If an error occurs that makes it impossible for you to
continue operating your monitor, the keyboard LED indicators will
also display the error code, which is d@flned in Table 1-2.
(See
Paragraph

1.11.)

Should

a
problem
occur,
consult
Paragraph
1.12
where
1-3
relates common symptoms and their probable causes and
suggests appropriate corrective actions.
Start
the
power-up self-test
with one of the
following
two methods:
Table

Turn

the

invoked
2.

power

the

VT240

automatically

each

on)
;
Or

type

one

power-up

the

self-test.

NOTE

following
(Read

(the

time

the

power-up

the

self-test

terminal

sequences
following

NOTE

conduct
first.)

you

are

already

operating

your

terminal,
enter SET-UP and put your
terminal in local and in the VT100 mode.
ESC
ESC

Y
H

(Performs test once)
9 v (Performs test continuuusly)r

NOTE

The
continuously
self-test ends only

running

power-up

if an error occurs
or the power is turned off. As each test
in the sequence ends successfully, the
keyboard generates a single bell tone.

turned
the

When

you

invoke

power-up

self-test:

LED

indicators

Initially,

been completed successfully, the LED
The keyboard generates a single bell

all

the

A "VT240 OK" message
on the screen.

1.4

EIA

PORT

DATA

LINES

enclosed

LOOPBACK

on.

When

the

indicators
tone

a rectangle

SELF-TEST

test
go

will

has

off
appear

In
the
EIA port data
lines
loopback self-test,
the
terminal's
transmit
and
receive
lines
are
connected
together
with
a
data
loopback connector.
(See
Figure
1-2.)
The
terminal
transmits
a
predefined
set of characters on
its transmit
line and
receives
them on its receive line.
It then compares the output characters
to the input characters and displays an error code at the LEDs and
an error message on the screen if the characters do not match.
(See

Paragraph 1.10.)
A successful

test

keyboard

LED

ends

when:

(1)

the

(2)
(3)

the keyboard generates a bell tone; and
a "VT240 OK" message enclosed by a rectangle
the screen.

indicators

are off;

appears

=== c==. = &
Comm

20 mA

HOST PORT

PRINTER PORT

CONNECTOR

'CONNECTOR

CONNECTOR

EIA HOST PORT

DATA LOOPBACK

CONNECTOR

PN 12- 15336
- 00

-t

Ww“

Gy,

20mA LOOPBACK

PRINTER PORT

CONNECTOR

LOOPBACK CONNECTOR

o~ V70 15503-00

o,Sty .

lnz=
|

TOPIN | TOPIN
| 15

| FROMPIN|
1

TOPIN
3

Figure

1-2

Rear

|
Connector

Panel

FROMPIN|
2

TOPIN
3

M’A-T 357-83
of VT24®

Ry,

PN 29-24795-00

[

[FrOMPIN|
|
=2
|
¢

put your terminal

the data

lmmpback connector

(PN

the host port.

Type one of the

ESC

;

[

;

[

following

;

12-15336-00)

the data

(Performs test once)

(Performs test continuously)

NOTE

ends only
power
is

The continuously running test
if
an
error occurs
or
the

turned off.
bell
tone
completed

the

to perform
sequences

self-test.

loopback
ESC

(See Figure 1-2.)

and

local

Enter SET-UP and

Connect

data

sel f-test.

VT100 mode.

port

the EIA

run

stepa

following

the

Perform

loopbamk

lines

The keyboard generates a
each
time
the
test
is

successfully.

If the EIA port data lines loopback self-test finds an
error, your terminal will display "VT240 EIA Port Data Error -- 4"
on the screen and an error code at the keyboard LED indicators.
(See paragraph

PRINTER PORT EXTERNAL LOOPBACK SELF-TEST

1.5

In the prlnter

and

1.11.)

port loopback self-test,

receive lines

loopback

are

(See

connector.

the prlntax port transmit

connected together

Figure

1-2.)

using

the

terminal

The

printer

port

transmits

predefined set of characters on its transmit line and receives
them on its receive line. It then compares the input characters
with the output characters and displays an error message on the
screen and an error code at the LED indicators 1if they do not

match.

(See Paragraph 1l.11.)
A successful test ends

when:

(1)

the keyboard

(2)
(3)

the keyboard generates a bell tone; and
a "VT240 OK" message enclosed by a rectangle
the

1.
2.

appears

the

following

self-test.

steps

run

the

printer

Enter SET-UP and put your termmal in local and in
VT100 mode.
Connect the printer port loopback connector to
printer port. (See Figure 1-2.)
Type one of the
following sequences
to perform
printer

ESC
ESC

screen.

Perform

loopback

LED indicators are off;

port external

loopback

test.

[ 4 ;3 y (Performs test once)

[

;

9 vy

(Performs test continuously)

port
the
the

the

Gy,

NOTE

The contlmuously runn1ng
if
an
error
occurs
or
turned

bell

off.

tone

completed

test
the

The

keyboard

each

time

ends only
power
is

generates

the

test

1is

successfully.

If the printer port loopback self-test finds an error,
your terminal will display "VT240 Printer Port Error -- 2" on the
screen
and
an
error
code
at
the
keyboard
LED
indicators.
(See
Paragraph

1.6

1.11.)

EIA

PORT CONTROL

LINES

LOOPBACK

SELF-TEST

This procedure tests data terminal ready, request
detect, data set ready, and clear to send.
A

successful

test

(1)
(2)

the
the

keyboard
keyboard

(3)

a "VT240 OK"
the screen.

ends

send,

carrier

when:

LED indicators are off;
generates a bell tone; and
message

enclosed

rectangle

appears

on
A,

Perform the following steps to tun«the EIA port control

lines

loopback

S———

self-test.

Enter SET~UPland put your terminal
in lodal and in the

VT100 mode.

Install
EIA loopback connector
host port. (See Figure 1-2.)

Type one

port

the

control

ESC

[ 4

;

6 y

ESC

[

;

following

lines

;

(PN

12-15336-00)

sequences

loopback

perform

EIA

the

EIA

self-test.

(Performs test once)
9

(Performs

test

continuously)

The continuously running
if
an
error occurs
or

test
the

NOTE

turned

off.

The

keyboard

bell
tone
each
time
completed successfully.

If
your

error,

(See

the

generates

the

test

screen

and

error code at the

1.11.)

receive

1is

keyboard

lines

port

are

loopback

connected

LED

finds
Error

an
--

indicators.

20 mA PORT LOOPBACK SELF-TEST
the

the EIA port control lines loopback self-test
terminal will display "VT240 EIA Port Control

Paragraph

1.7

ends only
power
|is

self-test, the

VT240's

together

with

transmit

data

and

loopback

connector.
(See Figure 1-2.)
The terminal transmits a predefined
set of characters
on its transmit line and
receives them on
its
g

receive line. It then compares the output characters to the input
characters and displays an error message on the screen and
an
error code at the LED indicators if the characters do not match.
(See Paragraph 1.11.)
A successful test ends when:
(1)

the

(2)

the

(3)

a "VT240 OK"
the screen.

message

Perform

following

loopback

1.
2.

keyboard

LED indicators (See Figure
keyboard generates a bell tone; and

the

enclosed

steps

1-1.)

are off;

rectangle

run

the

appears

port

self-test.

Enter

SET-UP

VT100 mode.
Connect the

and

put

your

terminal

20 mA loopback connector
(See Figure 1-2.)

20 mA port.

local

(PN

and

the

70-15503-00)

Type one of the following sequences.
ESC [

ESC

;

[ 4

(Performs

;

NOTE

test once)

(Performs test continuously)

ends only
is
power
The
keyboard
generates
a
each
time
the
test
1is

The continuously running test
the
or
occurs
an error
if
turned

bell

off.

tone

completed

the

successfully.

20 mA port loopback self-test

VT240 will display "VT240 20 mA Port
an

error code

the

keyboard

LED

finds an error, your

Error -- 3 on the screen and
indicators.

(See

Paragraph

1.11.)

1.8

INTEGRAL MODEM EXTERNAL LOOPBACK SELF-TEST

In the integral modem external loopback self-test, a predefined
set of characters is transmitted to the modem by the VT240 and
looped back to
the VT240 again. The VT240 then compares the
transmitted characters to the received characters and displays an

error
message
on
the
screen
indicators (See Figure 1-1.) if
Paragraph

1.11.)

A successful

(1)

(2)
(3)

and
an
error
code at
the
the characters do not match.

test ends when:

the keyboard LED indicators

(See Figure 1-1.)

the keyboard generates a bell tone; and
a "VT240 OK" message enclosed by a rectangle
the

screen.

LED
(See

are off;
appears on

external

Perform

the

loopback

self-test.

Enter

SET-UP

VT100

mode.

Connect

and

put

steps

your

run

terminal

the

integral

local

modem

and

the

(See

Figure

Type

one

integral

following

VT240

modem

1-2.)

ESC

[

;

15y

[

;

EIA

host

following

external

ESC

the

modem

sequences

loopback

computer

port.

perform

the

self-test.

(Performs

test once)
(Performs test continuously)

NOTE

The

continuously running
an
error
occurs
or

test
the

ends only
power
is

turned
off.
The
keyboard
generates
a
bell
tone
each
time
the
test
1is
completed successfully.
|

the

integral

modem

error,

your

terminal

will

screen

and

code

Paragraph

1.9
The

error

external

display
at

the

display height,
Perform

alignment
1.

loop

self-test

Modem

Error

keyboard

LED

finds

indicators.

width

the

following

self-test.
Enter

SET-UP

and

columns

put

VT100 mode

c.
d.

Local
Normal

Monochrome display
ESC

per

terminal

video

Refer to

steps

conduct

the

in:

line

(light

(Your

Chapter

select

1.10
If
the

printer

isolate

the

PRINTER

for

screen

text,

screen

for

dark

screen)

will display

complete

all

capital

description

"CLEAR

Es.)

monitor adjustments used with this test pattern.
To remove the test pattern from the screen, enter
and

Type

the screen with uppercase
linearity adjustments.

and

the
(See

1.11.)

SCREEN ALIGNMENT TEST
screen alignment test fills

making

"VT240

all
A

SET-UP

DISPLAY."

PROBLEMS

does

problem

not

print,

perform

the printer

the

following

the video

steps

terminal.
O

Perform

the
2‘

power-up

terminal

Perform
(See
go

the

passes

step

the

printer

Paragraph

1.5.)

self-test.

(See

self-test,

port
If

external

your

Paragraph

step

loopback

terminal

passes

1.3.)

2.
self-test.
this

test,

NOTE

If your terminal passes the above tests,

the problem is

it is running correctly;

not a malfunctioning terminal.

3.
4.

(Consult your printer pocket service

Test the printer.

guide

for

the

procedure.)

correct

operational, proceed to step 4.

Parity

1is

(VT240 and printer)

"printer

Ready"

appear

must

VT240

status

SET-UP

line.

Printer must be set to "Full Duplex.”

printer

Check the following SET-UP features to make certain that

Data bits per character

your

your VT240 and your printer are compatible.
Baud rate

Check

for

correct cable between

your

terminal

the

and

printer. (See Appendix C.) Make certain the connectors
are securely fastened at both ends of the cable.

Perform

steps

Paragraph

1.9.

and

the

Screen

Alignment

Test,

Press the PRINT SCREEN key. The video display should be
printed out on the printer if the printer is operating
correctly.

SELF-TEST ERROR CODES

1.11

Should your monitor display an error message on the screen, refer
to Table 1-2. Each error message includes a reference to the FRU
that must be replaced

the

to correct the problem.

In the event of a video problem refer to Table 1-2 where
encoding for the LED indicators (See Figure 1-1.) will also

disclose

the

faulty

component.

The

LED

indicators

will

always

display the error code for the test currently being run. Only upon

completing
the

error

this test successfully will

your VT240¢ terminal

clear

readout.

Refer to Table 1-3 for other troubleshooting procedures.

TROUBLESHOOTING MISCELLANEOUS PROBLEMS
1.12
Table 1-3 relates common symptoms to their probable
suggests appropriate corrective actions.

causes

and

Table

VT240

1-3

Symptom/Solution

"VT240 OK" DISPLAY
"POWER OK" INDICATOR OFF

FAN

Chart

Probable Cause

Symptom

Troubleshooting

KEYBOARD BELLTONE
OFF

Not

plugged

power

Corrective Action

in,

wall

Plug

outlet

try

VT240,

another

outlet.

Voltage Selection
Switch on wrong
setting

Set switch
setting.

Power

fuse

Replace

fuse

Power
tion

supply

connec-

Power

supply

faulty

correct

open.

Check power supply
connections.
Replace

power

supply

chassis.
System

AC
NO

"VT24@

"POWER
NO
FAN

OK"

DISPLAY

INDICATOR ON

KEYBOARD

line

corxd

Terminal

Replace

Check

controller

board

"vT24¢

for

Replace

opens/shorts.

terminal

controller

board.

BELLTONE

OK"

KEYBOARD

Brightness

DISPLAY

INDICATOR

BELLTONE

"VT240
"POWER

OK"
OK"

KEYBOARD

VT249

WITH

BELLTONE

Adjust
VR201

controller

and

knobs

monitor.

Replace terminal

board

controller

Monitor

Replace VR201 monitor.

VT240 host
connection

port
loose

board.

Check to see
plugged in.

host

Run

PRESENT

Host

port

circuits

faulty

Wrong

comm.

settings

"VT240

OK"

DISPLAY

"POWER

OK"

INDICATOR

BELLTONE

PRESENT

Fan

faulty

EIA

loopback

test.

failure

occurs,

enter

SET-UP and check
parity, data bits,
and

KEYBOARD

contrast

brightness

COMMUNICATE

HOST

too

PRESENT

DISPLAY PRESENT
INDICATOR ON

CANNOT

set

low

Terminal

FAN

system box.

"POWER

FAN

box

baud

Replace

rate.

power

BB,

supply

chassis.

PRESENT

OFF

Table

VT240 Symptom/Solution Troubleshooting Chart (Cont)

1-3

Symptom

Probable Cause

RANDOM CHARACTERS APPEAR

Wrong

comm.

Corrective

settings

Enter SET-UP and check

parity,

SCREEN

baud

Terminal
board
ONLY

HORIZONTAL

VERTICAL

LINE

Monitor

APPEARS

controller

Action

data bits,

rate.

Replace

and

terminal

controller

board.

Replace VR201 monitor.

faulty

SCREEN

DISPLAY

DISTORTED

controller

Monitor

Align monitor.

is out
alignment

Monitor
SCREEN

DISPLAY

KEYBOARD

DIFFERENT
APPEAR

WERE

JITTERY

BELLTONE

CHARACTERS

SCREEN

TYPED

LOCAL

THAN

faulty

Replace

WERE

Monitor

Replace

VR201

Replace

keyboard.

faulty

Keyboard

speaker bad

Alternate

character

set

SCREEN

(TERM

THAN

HOST

LOCAL)

Transmit
speeds

controller

TERMINAL DISPLAY DOES
HOLD

SCREEN

and

are

Bits per
set

RESET

field

receive

set

wrong

Replace

keyboard.

Replace

terminal

controller

board.

Set speeds
host.

to match

character

Set bits

to match.

wrong

Parity

SCROLL

with
Set-up.

monitor.

KEYBOARD

WITH

NOT

Clear

selected

Keyboard

CHARACTERS

TYPED

LINE

monitor.

Align monitor.

Terminal

VR201

Monitor is out of
alignment

board

APPEAR

board.

KEYBOARD

MODE

DIFFERENT

Replaae terminal

Terminal controller
board

set wrong

Set parity
host.

Stop bits set wrong

Set

"Hold Screen"
enabled

Press

INDICATOR

mode

to match

the

Screen"

host.

"Hold

key

disable.

Table

VT240 Symptum/Solutian‘Troub;eshooting Chart

1-3

Probable

Symptom

(Cont)

Corrective

Cause

TERMINAL APPEARS "LOCKED"

Action

DOES NOT RESPOND TO DATA

Clear terminal with
"CLEAR COMM" field in

FROM

Set-up.

SCREEN

HOST

GOES

BLANK

AFTER

SUCCESSFUL

POWER

THEN

HALF

HOUR

INACTIVITY FOR
POWER

LED

MESSAGES

ARE

INCOMPLETE

CRT

saver

feature

Cycle

power.

Press

any

key

reactivate

screen.
O

XON/XOFF not

selected

Terminal controller

Enable

Replace

Set-up.

terminal

board

controller

board.

Host port connections

Check

ports.

Incorrect mmde’

Ensure that terminal
Set-up prerequisites
are correct for escape
sequence desired. Refer

TERMINAL DOES NOT RESPOND
TO

ESCAPE

SEQUENCES

selected

host

Table

1-1.

FRU REMOVAL AND
REPLACEMENT

GENERA
2.1
the VT240
The removal and replacement procedures of FRUs for Recomme
nded
The
.
chapter
this
in
ed
describ
are
l
termina
series

Spares List is given in Paragraph 2.9.
TOP COVER

2.2

perform the following steps to remove the top cover.

on)
Turn the system box power switch to "o" (off positifrom

and remove the power cord from the wall outlet and
the power cord connector on the rear of the system box.

MA-1230-83

)

o6 000
00

Disconnect all other cables, if applicable,
panel of the system box including:
EIA host

port cable

20 mA host

port

cable

composite video output cable
video monitor cable
printer port cable

keyboard cable

modem

cables

Position system box with bottom side
and remove the two top cover retaining
inch

from the rear

slotted

screwdriver.

up as shown below
screws with a 7/32

TOP COVER

RETAINING SCREWS

FRONT SIDE

MA-1ZITBI (P)

‘Reposition
the system box as shown below. Lift
up from the front and pull forward to release

the
the

cover
hinge

hooks.
NOTE

You may have
to press the power
on the front of the system box
the top cover can be lifted free
bottom

cover.

install

the

switch
before
of the

:
S,

top cover,

perform

steps

1--4

reverse.

MA-1232-83(P)

POWER SUPPLY CHASSIS

2.3

Perform the
1.
2.

following

steps to

remove the power

Remove the top cover. (See Paragraph 2.2.)
Pull up on the two pop fasteners located on
the power supply chassis.

POP FASTENERS

supply chassis.

POWER SUPPLY CHASSIS

the

front

Lift
your

front of power supply
fingers under the front

chassis just enough
edge as shown below.

get
P

NOTE

Power supply chassis is firmly in place
and may require firm pressure to free it
once
the
released.

pop

fasteners

have

been

POWER SUPPLY CHASSIS
]

MA-1234-83(P)

ARSI,

Y
B

Cautiously work the power supply chassis away from the
rear chassis panel until the tabs on the power supply
chassis are disengaged from the slots in the rear chassis
panel.

REAR CHASSIS

PANEL

FRONT EDGE
OF CHASSIS

MA-1236-83

Disconnect

the

power

supply,

which

power

supply

chassis.

REAR

supply

cable

mounted

Put

the

connector

the

power

bottom

supply

from

side

chassis

the
the

aside.

CHASSIS gt |
FLAT CABLE

CONNECTOR

FRONT EDGE

OF CHASSIS

POWER SUPPLY CHASSIS
MA-1236-83(P)

2.4
Perform
board.

install

reverse.

power

the

supply chassis,

TERMINAL CONTROLLER BOARD

the

steps

following

remove

the

perform steps

terminal

1--5

controller

Remove the access cover. (See Paragraph 2.2‘)
Remove the power supply chassis.

(See Paragraph 2.3.)

NOTE

If an integral modem has been installed,
t before the terminal
be removed
it mus

controller board
2.7.)

Paragraph

Pull

the

can be

three

pop

replaced. (See

fasteners

that

secure

terminal controller board to the bottom chassis panel.
POP FASTENER

POP FASTENER

REAR

POP FASTENER

CHASSIS

AN, J

TERMINAL CONTROLLER BOARD
MA-1248-83(P)

the

Remove

tabs
from

the

terminal

controller

board

from the rear chassis panel.
terminal controller board.

by disengaging

Remove

power

the

cable

SLOT =

iR,

REAR CHASSIS

PANEL

TERMINAL CONTROLLER BOARD

MA-1249-83(P)

install
in

1--7

the terminal controller board, perform steps
|

reverse.

—

CAUTION

Before pressing down the pop fasteners,
make
certain
that
the bottom of
the
fasteners
are
well-seated
in
their
retaining

SYSTEM BOX

2.5

holes.

If the screen is blank or if the "Power OK" indicator on the rear
panel of the system box is off, and a check of the probable
defective devices such as the wall
socket, power cord,
fuse,
terminal controller board, and power supply have not corrected the
problem, exchange the system box (whole option swap).
Perform the following steps to exchange the system box.

Turn the system box power switch off and remove the power

cord

from

connector on

the

wall

the rear

outlet

and

from

the

power

cord

the system box.

MA-1230-83

Disconnect
the

the following

system

EIA

box,

host

including:

port

mA host

®
®

cable
composite video output
.video monitor cable

printer

keyboard

modem

port

9,"

the

rear

panel

cable

cables

box,

perform

steps

and

VT240 SERIES MONITOR
error message
on
your

pin on
exist:

the

cable

To instal
the new system
l

2.6
If
the

from

port

reverse.

ERROR

cables

system

monitor

has

cable.
N
‘

screen

failed

When

indicates,

this
|
|

“

"VT240

MONITOR
present"

sense

the

"monitor

occurs
fl

one

two

conditions
oS

Cable
with

is conngcted in reverse
the
990
bend
must
be
monitor.)

The

cable

of normal.
connected

(The cable end
to
the
VR201

defective.

If no error
indication is
indicate "1011" then one of
1.

Monitor cable

The cable

present on the monitor
two conditions exist:

yet

the

LEDs

NOT connected.

is defective.

If the VT240 series monitor is determined tc have failed, and if

video
alignment
and
exchange
the
entire

attempt

remove

~field. Refer

adjustment did
VT24¢
monitor

repair

to Appendix

not correct
the difficulty,
(whole
option
swap).
Do
not

any

part

you

have

the

CRT

assembly

the

color monitor.

praR

ooy

Perform the
1.

Turn

following
the

steps

box

power

system

exchange
switch

the VT24¢
to

"O"

video monitor.

(off

position).

MA-1230-83A

Disconnect

To
in

from

the

both

rear

install the
reverse.

the

your

new

video

monitor

VT240 monitor.

VT240

monitor,

keyboard

perform

J
MA-0009A82

and

steps

cables
1

and

INTEGRAL MODEM
2.7
If the error message on your screen
or if the LED indicators indicate a
replace

the

following

steps

remove

the modem.

Remove the top cover. (See Paragraph 2.2.)
Remove the power supply chassis. (See Paragraph 2.3.)
While
holding
the
standoff
clamp away
from the modem
circuit board with your thumb, 1lift the board free of the
standoff with your free hand.
(See illustration below.)
In

modem.

Perform

1.
2.
3.

reads "VT240 Modem Error -- 8"
faulty modem (See Table 1-2.),

this

four

(4)

terminal

manner,

the

free

the

standoff

controller

modem

clamps

circuit

board

secure

that

from

all

the

board.
|

STANDOFF

MODEM CIRCUIT

CLAMPS

BOARD

TERMINAL

CONTROLLER
BOARD

STANDOFF
CLAMP

MA-1240-83(P)

Grasp

the

modem

circuit

board

the

middle

(as

shown

below) and lift it up to free it from the connector that
secures the modem board to the terminal controller board.

MODEM
CIRCUIT

STANDOFF

BOARD

CLAMP
STANDOFF
CLAMPS

vvvvv

MA-1251-83(P}

To install the modem circuit board, perform steps 1--7

reverse.

NOTE

Before mounting the modem circuit board
onto the standoffs, fit the connectors
on the board through the cutout in the

rear

chassis panel

See

illustration

below.

CONNECTORS

REAR CHASSIS

PAMELCUTOUT“*»M*Kw”m

STANDOFF

STANDOFFS
MA-1239-83(P)

RO,

Once the modem circuit board has been positioned on the
standoffs, press the board in the middle (See below.) to
engage the connector on the terminal controller board.

STANDOFFS

CONNECTOR ON
UNDER SIDE OF

MODEM CIRCUIT

**\

BOARD

CONNECTOR ON
TERMINAL CONTROLLER

BOARD

MA-1241-83(P)

2.8
If
the

KEYBOARD
keyboard
is

faulty,

exchange

option swap). Perform the following
(See following illustration.)
1.

Turn

2 .

Disconnect

power

the

video monitor

keyboard

the

steps

Remove

the

keyboard

cable

keyboard

remove

the

(whole

keyboard.

off.

cable

the rear panel of your video
box, whichever applies.
3.

entire

from

the

monitor

from

the

cable connector

from

your

system

keyboard.

KEYBOARD

(BOTTOM VIEW)

KEYBOARD

CABLE

CONNECTOR\\\

[ ]

KEYBOARD CABLE
-

VIDEO MONITOR

KEYBOARD CABLE
CONNECTOR

(REAR VIEW)
el

(

SYSTEM BOX

(REAR VIEW)
s,

oo,

KEYBOARD CABLE
CONNECTOR
MA-Q0787-83

keyboard.
1.

Perform

the

following

Install

legend

(See following

Open clear

steps

illustrations.)

install

the

replacement

strip.
plastic window.

MAO776-83

b.
C.

Remove legend strip from defective keyboard.
Insert
old
legend
strip directly
over
the
presently

the

replacement

keyboard.

KEYBOARD

MA-OT 7783

clear

plastic

window.

one

Install

keyboard

standoffs.

KEYBOARD STANDOFF

KEYBOARD

(BOTTOM VIEW)

MA-0778-83

[

Connect

keyboard

to video monitor or

Insert keyboard cable into

system box.

SHORT GROOVE

connector on bottom of keyboard.

Press cable into short groove

of keyboard if routing to the left.
98]

Press cable into long groove

of keyboard if routing to the right.
4

LONG GROOVE

Insert keyboard cable into
connector on rear of monitor

or on rear of system box.

KEYBOARD

(BOTTOM VIEW)

KEYBOARD

CABLE

CONNECTOR

[ |
|

KEYBOARD CABLE
/

VIDEO MONITOR

KEYBOARD CABLE

" (REAR VIEW)

CONNECTOR

R—R————————.

|i
[y ®
SYSTEM BOX

(REAR VIEW)

KEYBOARD CABLE

CONNECTOR
MA-0787-83

Turn

4‘

2.9

The

RECOMMENDED

recommended

power

SPARES

spares

list

video monitor.

LIST

for

the

VT240

given

Table

2-1.

Table

2-1

Recommended

Spares List

Description

Part

System

VS240-A

BoOX

Power Supply Chassis
Terminal Controller

Number

70-19499-00
54-15495-01

Video Monitor Cable (VR201)
Video Monitor Cable (VR241] color monitor)

BCC@2
BCC@3

Monitor
Monitor
Monitor

VR201-A
VR201-B
VR2@1-C

Assembly
Assembly
Assembly

(White)
(Green)
(Amber)

Keyboard
Keyboard

United States/Canada
Belgium

LK2@1-AA
LA2@01-AB

Keyboard
Keyboard

Canada (French)
Denmark

LK201-AC
LK2@¢1-AD

Keyboard
Keyboard

United Kingdom
Finland

LK2@1-AE
LK2(1-AF

Keyboard
Keyboard
Keyboard

Germany
Holland
Italy

LK2@1-AG
LK20@1-AH
LK201-AI

Keyboard
Keyboard
Keyboard
Keyboard

Swiss (French)
Swiss (German)
Sweden
Norway

LK2@1-AK
LK201-AL
LK2@1-AM
LK201-AN

Keyboard

France

LK201-AP

Keyboard
Keyboard

Spain
Australia

LK201-AS
LK2@1-AZ

Integral

Modem

54-15643-01

EIA Loopback Connector
20 mA Loopback Connector
Printer Port Loopback

12-15336-00
79-15503-00
29-24795-00

Connector

Video Alignment Tool
Tuning

Wand

Fuse

(U.S.)

Fuse

Carrier

Fuse
Fuse

Fuse

3AG

29-23190-00

2 Ampere rating

(U.S.)

29-23189-00

90-07215-00
12-21126-03

Holder

12-21126-01

(European)
(European)

12-19284-00
12-21126-04

Carrier

VIDEO MONITOR
ALIGNMENT

3.1

GENERAL

The alignment procedure for the VT240 video monitor is described
in this chapter. Refer to Appendix E if you have a color monitor.
It will not be necessary to make all of the adjustments each time
you align your monitor. However, many of the adjustments affect
the adjustments should be
all
therefore,
settings;
the other

Then
checked.
adjustment can
setting.

if a check discloses
be omitted and you can

a correct setting that
go on to check the next

directed

the

Unless

otherwise,

all

made under the following conditions.
Enter SET-UP and put terminal
e
®

Normal video (light text,
80 columns per line

®
®

VT100@ mode
Local

adjustments

must

dark

screen)

Use the vVideo Alignment Template (PN 29-24371)
that
certain
Make
adjustments.
alignment
determining
adjustments are made under the conditions stated above.

for
all

REMOVING THE ACCESS COVER

3.2

WARNING

exposes

you

This

procedure

cover

is off of the terminal.

the

CRT

anode, which may contain a stored high
voltage. Use caution while the access
Perform

1.
2.

Turn

the

position).

Disconnect
rear

following

power
both

steps

the

remove the access cover.

the

system

video

and

keyboard

switch

your monitor.

box

cables

"0O"

(off

from

the

MA-QO0BABE

NOTE

Before

proceeding

with

step

place

face

down

piece of paper on a flat work surface to
avoid
scratching
the
monitor
bezel.
Carefully

‘this
The

place

paper.
face

the monitor

|
the

CRT must

cleaned

when

you have finished servicing the monitor.
Use the cleaning solution supplied with
the monitor or use isopropyl alcohol.
3.

Completely

extend

illustration
face down as

below.)
Then
carefully
place
described in the above note.

the

tilt

1leg

mechanism.
the

(See

monitor

AT,

MA-1247-83(P)

')
38

With

cap on the rear panel of the access cover.
With a Phillips type screwdriver, remove

small-bladed

screwdriver,

remove

washer that were exposed

when

you

screw

cover

secures

the

access

removed

round

the

the monitor's

MA-0009C82

the

plastic

screw

cap.

and

This

chassis.

Remove

the

cover

by sliding

CAUTION

When replacing
sure the tilt

straight

up.
ST

the monitor cover, make
mechanism foot
is fully

extended.

MA-0009D82

GG,

replace

the

access

cover,

perform

steps

1--6

reverse,

MONITOR ADJUSTMENTS
Initial

Conditions

Position
your
terminal
as
certain that your monitor is

shown
in
Figure
3-1.
Make
on a nonconductive surface.

The
locations
of
the
components
where most
adjustments will be made are shown in Figure 3-1.

(INSERT TUNING WAND INTO
FOC

HEXAGONAL HOLE INCOILTO

MAKE ADJUSTMENTS)

&
D

BRIGHTNESS ——=2f&a,
>\

CONTRAST

MA-1245-83(P)

Figure

3-1

Video

Adjustment

Locations

the

Reconnect

Turn

the

video

power

and

switch

keyboard

"1"

(on

cables.

position).

After
"VT240
OK"
appears
on
your
screen
and
conditions detailed in Paragraph 3.1 are satisfied,
ESC #8.
(Your screen will display all capital Es.)
will be your alignment pattern.

the
type
This

NOTE

Your
alignment
pattern
may
not
be
distinct.
Commence
with
the
following
alignment
procedures
to
correct
the
problem.
|
Character

3.3.2

Quality

Brightness
3.3.2.1
brightness.

-- Pperform the following steps to adjust the

SRS

Permit the terminal to warm up for at least 5 minutes.
Increase
both
the brightness
and
contrast
to maximum.
(See Figure 3-1 for the locations of the brightness and
contrast

controls.)

Decrease
the brightness
(raster) just disappear.
Go to Paragraph 3.3.2.2.

until

the

white

diagonal

1lines

CONTRAST -- Set the contrast control
(See Figure 3-1.)
3.3.2.2
for the desired intensity ofkdisplay relative to the background.

3.3.2.3

check

and

Vertical
adjust

Linearity‘

the

vertical

Perform

linearity

the

(VL).

following

steps

to
P

the

Check the height of the characters at the four corners of
the screen display. All of the characters should be the
same height.
If necessary, adjust the vertical linearity (VL) control
(See
Figure
3-1.)
until
all
of
the characters
are the
same height.

focus

Focus -(FO0).
Check

Paragraph

Perform

the

3.3.2.4.

the

characters

center of the screen
vertical
segments
distinguishable.

following

the

steps

four

corners

display. The
of
each
E

check

and

adjust

the

individual dots in the
should
be
readily

NOTE

Make

certain

that

the

screen

is clean.
oo

In some instances, the operator may want
the
focus
adjusted
to
suit
personal
preference. If the focus is adjusted as
desired, go to step 3.

Adjust the focus (FO) control (See Figure 3-1.) for
best overall character presentation, if necessary.
Go

Paragraph

3.3.3.

3.3.3

Display Instability

3.3.3.1

Vertical

the vertical
l.

2.
3.

3.3.3.2

hold

Hold --

(VH).

the

Perform

the

following

steps

adjust

Examine the monitor display for rolling or any other sign
instability.

of vertical

If necessary, adjust the vertical hold (VH) control
Figure 3-1.) to stabilize the screen display.
Go

Paragraph

3.3.3.2.

Horizontal Hold -- Perform the

the horizontal

hold

Examine

(HH).

the

monitor

display

following
for

steps to adjust

tearing

|
signs of horizontal instability.
If necessary, adjust the horizontal hold
(See Figure 3-1.) to stabilize the display.
Go

Paragraph

(See

any

(HH)

other

control

3.3.4.

Display Centering Adjustments

3.3.4.1

Yoke Rotation -- Perform the following steps to check the
-

display rotation.
1.

Use the scale on the alignment template (PN 29-24371-00)
to make the following measurements (See Figure 3-2).

EEECCEEEEEEEEEEE
EECEEEEEEEREEEEERE

INSIDE EDGE

OF BEZEL

‘

MA-1308-838

Figure

3-2

Rotation Measurements

Find

point

(five

columns of

row
of .Es from
the
bottom
Measure
the
distance
from

bezel.

Find

point

(five

from

the

left

and one

of the
alignment
pattern).
this
point
to
the
monitor

columns

from

the

right

and
one
row
of
Es
from
the bottom
of
the
alignment
pattern). Measure
the distance
from
this
point
to
the
monitor bezel. Compare both measurements. The difference

between measurements
- NOTE

the

-~ not

yoke

2‘
;.

not

greater than +2

adjusted

step

:3 » :3 . 41 . ;2“1

should

correctly,
to

Paragraph

If the display rotation is out of tolerance,
entire video monitor (whole option swap)
Go

Paragraph

replace

Use

your

allgnment« template

measurements
2.

(See

Figqure

rnake

3-3).

the

Measure

the

edge

distance

the

steps

following

Measure the distance al between the center
edge
of
the
alignment
pattern
of
Es
and

bezel.

the

3.3.4.2.

3.3.4.2
Horizontal Centering -- Perform the
followlng
check and adjust the horizontal centering (PH).
l.

mm.

of the left
the monitor

between

the

center

allgnment

pattern

and

the

right

monitor

EEEEE

EEEEEEEE
EEE
EEEEEE
L3

EEEEEEEEE

T tebt
b Ko

EEE

;

EEEEEE

EEEEEEEEE

g
EEEEEE

EEE

EEEEEE

EEEEEE
EEEEEEEE

EEEEEEEEE

pppppppppp EEEEEEEEEEEE

e | et

EEEEEEEEE EEEEE

EEEEEEEEEEEEEE

EEEEEFEEEEEEEEEEE »mhl»lhlwb-lf

8 2 e
:

|i
EEEE

EEEEEEEEEEEEE

EEE

EEEEEEEEEEEEREEEEER

EEEEEEE

EEEE

EEE
EE

;

E
EEEEEE

EEEE

EEEEEE

EEEEE

EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEERE
EKEEEEEEEEEEEEGEEEEEEEEEEfiEEEEEEEEEEGEEEEEEEEEEEEEEEEEEEEEEE
uuuuu EfiFEEEEEEEEEE&EEEEEEEEEEEEEEEEE&

INSIDE EDGE

OF BEZEL

MA-1308-B3C

Figure

3-3

Vertical

Centering

Measurements

Compare the measurements taken in steps 2 and 3. If the
difference between the two measurements is greater than 6
mm, adjust the horizontal centering control
(PH).
(See
Figure

3-1.)

Perform

steps

NOTE
If

the

2 and

again

PH control

centering

to verify the adjustment.

adjusts the horizontal

correctly,

Paragraph

3.3.4.3.
6.

necessary,

Paragraph

check

and

adjust

Vertical
Centering
-Perform
3.3.4.3
determine vertical centering dimensions.

Use

the scale

the

following measurements
20

the

display

size.

the

following

(See

3.3.5.)

alignment

(See

Figure

template

3-3).

steps

make

the

the
of
the top center
from
the distance Dbl
Measure
alignment to the monitor bezel. Also measure the distance
b2 from the bottom center of the alignment pattern to the
|
monitor bezel.
Compare the two measurements you made in step 2.
The
distance from the top edge of the alignment pattern to
the bezel must be greater
than the distance from the
bottom edge of the alignment pattern to the bezel. This
difference must be within the range of 2 mm to 14 mm. If
the difference is not within the range specified, go to
step 4. Otherwise go to Paragraph 3.3.5.
NOTE

The electrical center of the screen is
"not the same as the apparent physical
been
has
monitor
the
When
center.
adjusted correctly, the screen display
will

offset

toward

the

bottom

the

screen.

your

entire

measurement

video

monitor

out

(whole

centering cannot be adjusted.
Go to Paragraph 3.3.5.

tolerance,

option

swap).

replace

The

the

vertical

3.3.5
1.

Aspect

Ratio

Enter Setup. Clear display, and put terminal
video (dark text, light screen).
Put terminal in Local mode and in VT100 mode.
Exit Set-Up.

Type the following
alignment pattern:

escape

sequence

invoke

reverse

the graphics

ESC Pp
P

[390,240]

[200]

NOTE

not

The

type

spaces

shown

carriage

returns.

were

included

only

clarity.

for

Observe circle for ovalness or flattening. If
appears abnormal, perform steps 6 through 9.
Use
your
alignment template
to
make
the

the

circle

following

measurements.

(See Figure 3-4.)
Measure the distance al
from the center of the left edge of the alignment pattern
to the monitor bezel.
Also measure the distance a2 from

the center of the right
the monitor bezel.

i T WY P

edge

the

alignment

pattern

nal: VAR

INSIDE EDGE \

OF BEZEL

MA-1309-83A

Figure

3-4

Aspect

Ratio

Measurements

Subtract the sum (al+a2) from 242 mm (the width of the
monitor screen) to arrive at the width of the video
display.

Example:

al = 21 mm

a2 = 20 mm

al+a2 = 41 mm

vVideo display width = 242 - 41 mm = 201 mm

The video display width must be within the range of 200

to 210 mm. If necessary, adjust HW (the horizontal width

control)

until

range specified.

the

video

display

(See Figure 3-1.)

width

within

the

Adjust H (the height control) as necessary to improve the

appearance of the circle.
19.

Type ESC \ to exit the ReGIS Graphics mode.

S5
G

SET-UP REFERENCE MATERIAL
Refer to the
summaries for

VT240 Owner's Manual
the VT240 terminal.

(EK-VT240-UG)

for

the

SET-UP

RS,

[

SO,

)

APPENDIX

VT240

DOCUMENTATION

All
related documentation pertaining
included in the following list.
VT240

Owner's

This

manual
and

operate

the

VT240

terminal

Manual

EK-VT240-0UG

provides
service

the
user
with
the
information
needed
VT240 terminal.
The manual
includes

the

to
an

overview of
the
VT240's
physical
and functional
structure.
Specific operational features such as SET-UP procedures, controls
and
indicators
information,
communication
interfaces,
and
test
functions are also described.
Installation Guide
This

EK-VT240-IN

guide
provides
the
user
with
the
assemble,
and
bring
the
VT240

unpack,

information
to

terminal

needed
to
operating

status.

VT240

Programmer's

This

manual

needed

VT240

the

VT240

use

Reference

provides

the

Manual

programmer

the communication
series terminal.

Programmer's

EK-VT240-RM

Reference

and

with

This
to

Pocket

guide

test,

Service

provides

the

with

summary

the

VT240
series
terminal.
and control sequences on a

EK-VT240@-PS

service
and

features

EK-VT240-RC

Guide

troubleshoot,

information

processing

Card

This
card
provides
the
programmer
information
needed
to
program
the
Essentially, it is a list of the escape
pocket size reference card.
VT240

all

character

personnel

repair

the

with

the

VT240

series

information
terminal.

needed

VT240

Technical

Manual

EK-VT240-TM

This manual provides the user with a technical description with
which to isolate and repair VT240 problems that go beyond the FRU
replacement level of repair. The manual includes an overview of
both hardware and software components, and detailed descriptions
of communications components and subsystems to the major circuit

level.

VT24@¢ Terminal

IPB

EK~-VT240-1P

This
document
1is
a detailed
parts breakdown of
the
VT240
terminal's field replaceable units. This document does not contain
part numbers for components on the printed circuit boards.

However,

these

Maintenance

components
Set,

which

are

listed

is ordered

the

separately.

VT24¢

Field

VT24¢ Field Maintenance Print‘Set
The following documents provide the user with a complete set of
electrical
and mechanical
schematic diagrams for the VT2490
terminal.

- For
- For
- For

the system box (VS240)
the monitor (VR201)
the keyboard (LK201)

MP-@1597
MP-01410-00
MP-01395-00
[

APPENDIX
M

FRU

EXPLODED VIEW

DRAWINGS

VR201 VIDEO MONITOR
VR201-A (WHITE PHOSPHOR)
VR201-B (GREEN PHOSPHOR)
VR201-C (AMBER PHOSPHOR)

KEYBOARD CABLE

17-00294-00

VS240 SYSTEM BOX

LK201 KEYBOARD

LK201-AA (US)

LK201-AC (CANADA (FR))
LK201-AD (DENMARK)
LK201-AE (UK)
LK201-AF (FINLAND)
LK201-AG (GERMANY)
LK201-AH (HOLLAND)
LK201-Al (ITALY)
LK201-AK (SWISS (FR))
LK201-AL (SWISS (GR))
LK201-AM (SWEDEN)
LK201-AN (NORWAY)
LK201-AP (FRANCE)
LK201-AS (SPAIN)

LK201-AZ (AUSTRALIA)

POWER SUPPLY CHASSIS
70-19499-00

CONTROLLER BOARD

54- 15495

INTEGRAL MODEM

54-15643-01

vT240-FRU-01

Figure

B-1

VT240 FRUs

(Exploded View)

———,

iR,

[

APPENDIX C

CABLE

o
“

INFORMATION

In
Figure C-1 are
shown
the
cable
connections
for
the
VT240
terminal. The available interface cables are listed in Table C-1
and the modem control selections in Table C-2.

VT240 TERMINAL
O

PRINTER PORT
oo,

PRINTER CABLE

| PRINTER

BCCOb5

NULL MODEM CABLE
BC22D

HOST COMPUTER

F{m}

KTABNA,

MODEM CABLE
BCCO4
BC22E

20mA CABLE
BCOSGF

W
T
WO——-—
SO0
WO
OIS
SR
o

M| F}

HOST COMPUTER
O

B———

WIS

VIDEO CABLE

‘

BCCO2
(BCCO3 FOR COLOR MONITOR)

VR201 MONITOR

(VR241 MONITOR)
KEYBOARD JACK

KEYBOARD CABLE
BCCO1

@E L
L

ORI

LK201 KEYBOARD
oo

AC POWER CORD

17-00083-09

| @

;

WALL OUTLET

MA-1248-83 (P)

Figure

C-1

Cable

Summary
R,

Table C-1

Interface

Cables

Cable

Number

Connector

Function

BCC@5-10
BCC@5-25

17-00300-00
17-00300-01

9 pin F RS232
to 25 pin F RS232

VT240 and Printer
(Printer Cable)

BC22D-10
BC22D-25

17-00313-01
17-00313-02

25
to

Null Modem Cable,
VT240 to Host

BC22D-50

17-00313-04

pin F RS232
25 pin F RS232

BCC@4-19

17-00289-00

25 pin

BCC@4-25

17-00289-01

BC@5F-15

17-XXXXX-XX

25 pin
pin

RS232

Modem Cable,

VT24¢

RS232

17-00283-00

BCCPl-06

N/A

17-00284-00

17-00294-00

and

system box)

keyboard

Telephone

17-00083-09

Jack

jack

Keyboard

Cable,

keyboard

17-00199-00

17-00209-00

17-00210-00

Cable

Power

Cable

Kingdom

Power

Cable

Swiss
AC

N/A

Power

United
AC

N/A

250 V)

Power

German
AC

N/A

Cable

Australian
AC

N/A

Power

(U.S.

17-00198-00

17-00311-01

Power

Cable

Danish
AC

VT240

(U.S. 125 V)

17-00083-10

box)

VR241 Cable
(VR241 Monitor

N/A

Host

15 pin F RS232 to 3
coaxial connectors

N/A

Video Cable
(VT249 Monitor
system

BCC@P3-06

Modem

mA Cable,

VT240

BCC@2-06

Power

Cable

Table C-2

Modem Control

Selections

Selection

Description

Usual

EIA
Data

Full

modem

Full duplex communication
with a null modem (direct)
connection to the computer
or with a modem that does

leads

only

duplex no EIA
control
(data leads only)

not

Application

use modem

control

signals.
EIA

modem

control

Full duplex with
EIA modem control

Full duplex communication
with a modem that uses
modem control signals,
or with a port on the host
computer supporting modem
controls.

gty

SR,

APPENDIX

PHYSICAL

FUNCTIONAL

See

Figure

D-1

DIAGRAM

for

interrelationships

physical functional

among

diagram

components.

NOTE

All

voltage readings are based on a line
voltage of
115 Vac.
Your
readings may
differ in accordance with any variations
in your line voltage.
J1

(Power

N.C.

Supply

N.C.

=12

Connector)

Volts

Volts
Ground

Ground

8
9

Ground
Ground

Ground

+12

Volts

+12

Volts

+12

Volts

14
15

+12 Volts
Ground

Volts

(Printer

1l
WU
Wk

Port Connector)
N.C.
Transmitted Data
Received Data
Ready to Send
Data

Terminal

Data

Set

Signal
Signal

Ready

Ground
Ground

N.C.

showing

the

OS5

|‘

\finASVEINGS HOLJ3INOD

oe T0HLINOD 3qin |HOLOINNOD

TYNINHTL

HITIOHINOD ayvos NS#6¥dS-L

HOLDINGD

SRR

\|¥O“3IMVOd

1Nd1N0 HOLINOW

311SOdWOD

HO13NOD

13Z238 14DJAONY

SGI¥NHI6MA5Sd-NO1YD

LONdVNI

Q9HVYOoH-A3N

~0—30_1A

GdVYD8A3N 318V

MoVEA1d

H0#OL8ON39ILd6-NO1D

——

0N-¥62d0-L1

60
MR

J3 (EIA
Pin

Host

Port

Connector)

N.C.

Transmitted Data
Received Data
Request to Send
Clear to Send
Data Set Ready
Signal Ground
Received Line Signal

Detector

N.C.

N.C.
N.C.

Speed

Indicator

N.C.
N.C.

N.C.

N.C.
N.C.
N.C.

Data

Terminal

Ready

N.C.

Speed

Select

N.C.
N.C.

J4 (20 mA Host
N.C.
Pin

Port

Connector)

TransmitReceiveN.C.

Transmit+
N.C.

Receive+
Ground

(Modem

Connector)
+12

Volts

Mode

Select
Data Set Ready
Received Data
Speed Indicator
Transmitted Data
Speed Select
Ground
Data Available
Off Hook Drive

Modem 9-bit character/l10-bit character
Modem

Present

Talk/Data
Modem A/B

15
16

N.C.
Domestic/Europe

Dial

N.C.

Tone

Detect

19
20

=12 Volts
Coupler Cut

Switch

Off

Through

Hook

Modem

N.C.

Analog

Test

Remote

Data

NI,

Loop
s

J6 (Keyboard Connector)
Pin
1
Transmitted Data

+12

3
4

Signal Ground
Received Data

Volts

(Composite

Video

Signal

Output

Connector)

Output

Ground

J8 (Video Monitor
Pin
1
Ground

Connector)
A

Ground
3

Ground

4
5

Ground
Ground

Ground

+12

Volts

+12

Volts

9
19

Blue Output
Green Output

Red

Monochrome

Output

Monitor

Keyboard

Present
Transmit

Keyboard

Receive

APPENDIX

VT240

COLOR VIDEO

MONITOR,

MODEL VR241-A

INTRODUCTION
PURPOSE

This appendix provides the following
VR241-A Color Video Monitor.
Troubleshooting
Quality checks and
Operational

and

adjustment

physical

information

servicing

procedures

descriptions

This
information
applies
to
VT240
host
system
that have the following standard test patterns.
(See Table
These test patterns are listed below:
|
DISPLAY
COLOR
RED

ALIGNMENT

BAR

PATTERN

PATTERN
(See

(See

Figure

GREEN

E-1.)

E-2.)

SCREEN

Notes,

Cautions,

Warnings

Notes,

Cautions,

and

contain

general

Cautions

contain

Warnings

contain

Warnings

appear

information

you

throughout
should

Tool

Part

Phillips

this

appendix.

aware

of.

information
to prevent damage to the equipment.
information to prevent personal injury.

Tools Required
|
You need the followin
tools to
g service the
Monitor.
]
-

Video

units
E-1.)

SCREEN

BLUE

Notes

the

screwdriver

alignment template

VR241 adjustment tool
Hex core alignment tool

o
|

Number

none
«

29-24371-00
29-24746-00
29-23190-00

VR241-A

Color

Video
*

Table E-1

Test Pattern Summary for Color Monitors

Unless directed otherwise, to invoke
observe the following prerequisites:
[

Enter

Put monitor in
- Local
- VT100 mode
- 80 columns per line
- Color display
- Normal video (light
Exit Set-Up

Pattern

Display‘(Screen of
white Es)
Alignment

Pattern
C [200]

test

patterns,

text,

dark

screen).

Sequence
(See Note)

Prerequisite
Exception

" ESC # 8

- monochrome display

ESC Ppy

ESC {4:4y

ESC

Screen

Pattern

ESC [4;12y

Blue

ESC

[4;10y

White

ESC

[4;

Screen

Pattern

reverse video (dark
text, light screen)

[4;1ly

5. Green Screen Pattern
Screen

- monochrome display

[390,240)]
)

3. Color Bar Pattern

NOTE:

the

Pattern

2. Graphics Alignment

Red

Set-Up

Test

any

13y

Do not type spaces between parameters of escape
parameters are spaced as shown for clarity only.
NOTE:

sequences.

The

Test patterns 3 through 7 force a RESET of the terminal Set-Up
features back to the saved defaults. The prerequisites must be
Set-Up before invoking each self-test.

NOTE:

IT IS IMPERATIVE THAT THE EIA PORT NOT BE CONNECTED TO A
INVOKING THE VT240 SELF-TESTS AND ALIGNMENT PATTERNS.

HOST WHEN

EETETIIOREERESE
&

INSIDE EDGE

OF BEZEL

RASTER

VIDEO

EDGE

EDGE
= ! = oL= =8

E-1

Screen of

Alignment Pattern

&wa”m

LM)

>=wO

BEZEL
EDGE

EDGE

Figure

E-2

Color

)

ettt el

P*O

Wty

IR,

Figure

RASTER
EDGE

Bar

MA 1310-83

Pattern

E.1.0

TROUBLESHOOTING THE VR241-A COLOR MONITOR

E.l.1

GENERAL

This chapter provides information to troubleshoot the four types
of problems that may affect your VR241-A color monitor: no video,
distorted video, color problems, and/or alignment problems. Refer
to the section that most closely describes your monitor's problem,
match the symptom, then take the corrective action suggested.
The corrective procedures
in this appendix assume that
only one
assembly has
failed
or
only one
problem
exists.
The

symptoms that your monitor displays may indicate more than one
failure or problem because some of the circuits of your monitor
may
interact
with
the
other
circuits.
Therefore,
you
should
troubleshoot

E.1.2
Use Table
the host

the most obvious

NO VIDEO
E-2 when the monitor
system unit.

symptom.

will

not display a

picture

sent by

NOTE

Make sure the color
up for at least 15
use

E.1.3

Table

monitor
minutes

has warmed
before you

E-2.

DISTORTED VIDEO

Use Table E-3 to find the appropriate corrective action when your
monitor display is distorted. Typical display distortions include
rolling, flickering, blooming, and displays that do not disappear
at minimum contrast and brightness control settings.
NOTE

Make sure the color monmtor warms up for
at least 15 minutes before you use Table
E-3.

E.1l.4

COLOR

PROBLEMS

Use Table E-4 to find the corz‘:ectlve actmn when your monitor
distorts the color of the picture sent by the host system unit.
SR,

NOTE

Make

sure the color monitor warms up for
at least 15 minutes before you use Table

Table

E-2

No Video Troubleshooting Procedures

Symptom

Conditions

Corrective Action

Screen is black,
there is no video
or raster, and
the green "power

One end of the power
cord is disconnected.

Reconnect

OK"

is
indicator

Power
turned

off.

no power
outlet.

There is
the wall

fuse has

Monitor's

cord.

Turn the VR241-A power
switch to "1" (on
position).

switch
off.

power

Make sure there is
power at the outlet.
Replace

fuse.

blown.

You performed all of

the

Replace monitor.

above but

steps

the problem has not
been corrected.
Screen

there

black,

no video

or raster, but
green "power OK"

indicator

is on.

are

Service switch is set
to SERVICE position.
is

Monitor
There is a raster
but no video.

Turn brightness and

Brightness and
contrast controls
set to minimum.

faulty.

contrast
maximum.

controls

Set switch
position.

NORMAL

Replace monitor.

Signal cable is
disconnected.

Connect signal cable
between monitor and

Host

Turn host system unit
to "1" (on position).

host

is not on.

set

cable

Contrast

Host

unit.

Turn contrast
to maximum to
video.

faulty.

Replace

minimum.

Signal

system

system unit

faulty.

Refer

signal

host

unit's pocket

control
see

cable.
system

service

guide.

Color monitor

Replace color monitor.

faulty.

Only a

horizontal

line appears
the screen.

Set

switch

NORMAL

Service switch is set
to SERVICE position,.

position.

Color monitor

Replace color monitor.

faulty.

Table

E-3

Distorted

video

Troubleshooting

Symptom

Conditions

Video

Video cable is connected
incorrectly or an
external video sync is
required from the host
system unit.

rolls

vertically and
horizontally.

Corrective

Synchronization

is set to
position.

Procedures

the

switch

wrong

Check

video

Action
cable

color monitor

and

host system unit, or
add an external sync
cable if required by
your host system unit.
Check the switch
settings on monitor,

and match monitor to
host system type. (See
Paragraph E.4.7 for
correct setting.)

Signal

cable

Monitor

faulty.

Replace

signal

cable.
SO,

out

Perform color monitor
synchronization
procedure. (See
Paragraph E.2.3.)

adjustment.

Host

system

unit

Refer

unit's

faulty.

host

pocket

system

service

guide.

Color monitor
Video

rolls

vertically.

Monitor sync
adjustment.

Host

system

is
is

unit

faulty.
out

faulty.

Replace color monitor.
Perform color monitor
synchronization
procedure.

(See

Paragraph

E.2.3.)

Refer to host
unit's pocket

system
service

guide.
Color monitor

faulty.

Replace

pr—

color monitor.

prm——

Table E-3

Distorted video Troubleshooting Procedures

Corrective

Symptom

Conditions

video rolls
horizontally.

adjustment.

Monitor

Host

(Cont)

sync

system

out of

unit

faulty.

color monitor

synchronization

Perform

Action

procedure.

(See

Paragraph

E.2.3.)

Refer to host
unit's pocket

system
service

guide.

Color monitor
Video

shows

blooming at
high intensity

Impedance

faulty.

switch

incorrectly
for

set

your
-

system configuration.

levels.

Replace

~
color monitor.

Check monitor's
impedance switch
setting for your system
~configuration.
(See
Paragraph

White balance
adjustment.

out of

for

setting.)

Perform

white balance

procedure.

(See

Paragraph

E.2.15.)

faulty.

Replace color monitor.

Monitor's white balance
is out of adjustment.

Perform white balance
check/adjustment

Color monitor
Raster and/or
video will not
disappear when
brightness and
contrast controls
are at minimum.

E.4.7

correct

procedure.

Paragraph

Color monitor

faulty.

(See

E.2.15.)

Replace color monitor.

Table

E-4

Color

Troubleshooting

Procedures
o

Symptom

Conditions

Corrective Action

Wrong color is
displayed and

Video cables are
connected incorrectly.

Check

color

bars

are

in wrong
position.

Color

monitor

faulty.

video

cables

color monitor and
host system unit.
Replace

color

at
o,

monitor.
ARSI,

Wrong color is
displayed but
color bars are

Host system
software is

unit
faulty.

Have

customer

verify

software.

correctly

positioned.
Color

Signal

bar

pattern
missing

1is
a color,

cable

White balance

faulty.

not

normal.

Replace

Host

system

unit

cable.

Perform color monitor
white balance check/
adjustment procedure.
(See

faulty.

signal

Paragraph

Refer to host
unit's pocket

E.2.15.)
system
service

guide.
————y:

Color monitor
Convergence

color
not

Monitor

faulty.

needs degaussing.

purity is

normal.

Replace

color monitor.

Turn monitor to "g"
(off position) for 10
minutes then turn it to
"1" (on position) to
activate the internal
degaussing

circuits.

Monitor is located near
strong magnetic field.

Move monitor to an area
free of strong magnetic
fields.

Color monitor

Replace color monitor.

faulty.

Table E-4

Color Troubleshooting Procedures

Symptom

White balancing
is

not

normal.

(Cont)

Conditions

Corrective

Impedance switch is set
incorrectly for your

Check the monitor's
‘impedance switch
setting for system
configuration. (See

system's configuration.

Paragraph

proper

Video cables are
connected incorrectly.

Check

video

monitor

unit is

system

cables
and

at
at

unit.

Paragraph

E.2.15.)

Refer to host system

unit's
guide.

Color monitor is faulty.

for

Perform color monitor
white balance check/
adjustment procedure.
(See

Host system
faulty.

E.4.7

settings.)

color
host

Monitor's white balance
is out of adjustment.

Action

Replace

pocket

service

color monitor.

E.1.5

ALIGNMENT PROBLEMS

Use Table E-5 to find the approprlate correctlve action when the

on
display
misaligned.

your monitor,

sent

the

host

system

unit,

E.1.6

TERMINAL HOST

PRESETS

Refer to Table E~1 for Set-Up presets and exceptlons.
NOTE

Make sure the color monitor warms up for
at least 15 minutes before you use Table
A

NOTE

Make sure the color monitor warms up for
at least 15 minutes before you use Table
E"'Sw

CAUTION

Magnetic

fields

affect

the

performance

of
the
color monitor. Do
not operate
your
monitor
near
electromechanical
devices such as printers, or near large
magnetized
objects
such
as
filing
cabinets or steel beams in walls.

GO,

SR,

Table

E-5

Troubleshooting

Symptom

Conditions

Video is
rotated.

Monitor is
rotational

Alignment

Problems

Corrective Action
out of
adjustment.

Replace color monitor.

CAUTION

Video
or is

unstable
jittery

not attempt

adjust

Monitor is out of
adjustment.

the

sync

after new
display.

Color monitor

video

not

centered.

faulty.

Monitor is out of
centering adjustment.

yoke.
Perform color monitor
synchronization
procedure.

(See

Paragraph

E.2.3.)

Replace

color

Perform appropriate
color monitor centering
procedures.
(See
Paragraphs
and

E.2.5,

Color monitor

Video

not

rectangular.

faulty.

Monitor is out of
rectangular adjustment.

Video has
incorrect
aspect ratio.

Monitor is out of
ratio alignment.

color

monitor.

Perform

color

monitor

rectangular check/
adjustment procedure.

not

linear.

Monitor

out

Replace color monitor.

aspect

Perform color monitor
aspect ratio check/

focused.

faulty.
linear

adjustment.

not

Monitor

procedure.

Paragraph

E.2.9.)

Replace color monitor.
Perform

appropriate

color monitor linear
check/adjustment

Color monitor
Video

E.2.8.)

faulty.

(See

Vvideo

Paragraph

adjustment

Color monitor

E. 2.4,
E.2.6.)

Replace

(See

Color monitor

monitor.

out

is
of

faulty.
focus

adjustment.

Color monitor

procedures.

(See

Paragraphs
E.2.11.)

E.2.10

and

Replace

color monitor.

Perform

color

monitor

focusing check/
adjustment procedure.
(See Paragraph E.2.12.)

faulty.

Replace

color monitor.

E.2.0

QUALITY CHECK/ADJUSTMENT

E.2.1

GENERAL

PROCEDURES

This chapter describes how to check and adjust the quallty of the
video
display.
If
the
video display
1is
acceptable
as
1is,
the
adjustments for that check need not be made.
Instead, go to the
next check/adjustment.
These
quality checks/adjustment procedures
are
to
be

performed
depend on

in the order shown because some of them
the correctness of the preceding ones.
These

monitor exhibits
display, use the

procedures

are

performed

interact

only

when

and
your

a display.
If your monitor will not exhibit a
troubleshooting procedures described in Chapter

E.1l.

A
locations

summary

is given
If
an

preadjustment

been

after

adjustment

and

in Chapter E.4.
adjustment
is

procedure

checks/adjustment

precautions

once

then

operating

necessary,

continue

perform

with

procedures. Then,
observe
all quality checks/adjustment

function

the

quality

the
following
procedures have

completed.

[

Make

certain

that

brlghtness

and

contrast

certain the ground cable
tab. (See Figure E-3).

connected

controls

turn

freely.

Make
left

When

reinstalling

plastic
controls

cabinet

cover,

rear

lower

sure

the

white

shield
around
the
brightness
is tucked inside the cover.

and

contrast

MA.1283-83

CABLE

Figure E-3

VR241~A Monitor Ground Cable
74

Eflzflz
Perform
11

PREADJUSTMENT

this
Turn

procedure
power

before

only

"@"

adjustment

(off

position)

needed.

and

wait

seconds

continuing.

WARNING

Static
charges
on
the
CRT
can
cause
shock
1injury.
Static
charges
take
at
least 30 seconds to dissipate after the
monitor has been turned off.
Disconnect power cables.
Disconnect video cables.
Remove tilt swivel if installed.

Carefully set monitor

face down.

CAUTION

not

scratch

the

bezel

screen.

Place monitor on a nonabrasive surface
such as a large desk pad or soft cloth.

Remove four screws that hold cover. (See Figure E-4.)
Pull cover straight up and set it aside.
Carefully set monitor back on its base.
Reconnect

19.

11.

all

cables.

Turn monitor on and allow it to warm up for 15 minutes.
Unless directed otherwise, set brightness control so that
raster just disappears and contrast control is at desired
display intensity relative to background.

PHILLIPS HEAD
SCREWS (2)

Y, :

ey 10000 |/
wo ool

fla 000; 17 ||

SELF-TAPPING
PHILLIPS HEAD
SCREWS (2)
83
MA-0B22

Figure

E-4

Monitor

Cover

Removal

VIDEO SYNCHRONIZATION

E.2.3

Perform the following steps to check, and if necessary, adjust the

video

synchronization.

Paragraph

Host

Terminal

that

Ensure

are

Presets

detailed

1in

E.1l.6.

Set contrast and brightness controls for desired viewing

comfort.

Display any

test

pattern.

slide synchronization switch back and forth.
Observe the display. The picture should lock
with no tearing of the top lines.

in quickly
o

NOTE

If display is normal, continue to the
check/adjustment
centering
vertical
If
procedure. (See Paragraph E.2.4.)
sure
be
normal,
not
is
display
preadjustment procedure was completed
and continue to step 6.

6a.
6b.

Restore terminal presets as described
Display the alignment pattern, which
Es. Invoke this display by typing:
ESC

in Paragraph E.1l.6.
is a screen of all

Slide the synchronization input selector switch so that
the screen rolls, which means no synchronization input
signal is being applied. (See Figure E-5.)
Adjust horizontal hold (H. HOLD) control so picture has
almost

stopped

rolling

horizontally.

Turn vertical hold
(V. HOLD)
control so picture rolls
vertically one way. Then back up V. HOLD so picture rolls
the opposite way.
Now set control
to center of this

10.

vertical synchronization holding range.
Slide synchronization input selector switch
pattern locks in and stops rolling, which means
synchronization input signal is being applied.

so test
that the

000 ,fl

T
@JU]

‘

’

SYNC SWITCH
O

V.HOLD
H.HOLD

REAR VIEW
MA-0823-83

Figure

E-5

Video

Sync

Adjustments

VERTICAL CENTERING
E.2.4
Perform the following steps to check, and

vertical

1.
2.

centering.

Ensure

that

Paragraph

Terminal

Host

if necessary, adjust the

Presets

E.l.6.

Display alignment pattern, which
Invoke this display by typing:
ESC # 8 (See Figure E-6.)

are

a screen

detailed
full

Measure the distance bl from the center of the
of the alignment pattern to the monitor bezel.

EEEEE

//fl

INSIDE EDGE

OF BEZEL

b1=b2{+5mm)

a000

700

0920
D 6CC
08
I 0%0050
o 0%°Fo

\ch3cj e
o X\UM 100
MA-1304-83

Figure

E-6

Vertical

Centering

Adjustments

1in
Es.

top edge

Measure
edge of
Check

the distance
the alignment

that

b2
from the center of
the bottom
pattern to the monitor bezel.

measurements

are

equal

within

each

other.
NOTE

If measurements are within limitations,
continue
to the horizontal centering
check/adjustment
procedure.
(See
Paragraph
E.2.5.)
If
measurements
are
not
within
1limitations,
be
sure
preadjustment
then continue

procedure
to step 6.

was

completed,

Turn
vertical
centering
(V.
CENT)
adjustment
until
distance from top center of alignment pattern
to bezel
and distance from bottom center of alignment pattern to
bezel are within 5 mm of each other.

HORIZONTAL CENTERING

Perform the following steps
horizontal centering.

to check,

and

1f necessary,

adjust

the

detailed

1in

Ensure

that

Display the alignment pattern, which
Es. Invoke this display by typing:

Paragraph

ESC

Terminal

Host

Presets

are

E.l.6.

(See

Figure

screen

E-7.)

EEEEFEFEEEECEEEEEEEFEEEEEEEEEERECEEEEEEEEEEEER

EEEEEEEEEEEEREEEEEEEEEEEEREEREEE

full

EEEEEEEEEEEEEEEEEEECEEEEEEEEEEEEEEEEEEEE

EEEEEEEEEEEE

EEEEEECEEEECEEEEFEREEEEREEEEEEEEEERE
EEEEEEEE
EEEEEEEEEEEEEEEEEEEEfiEEEEEEEREEE&EEEEEEEEEEEEEEEEE&EEEEEEEEE
EEEEE
FEEFEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
EfiEE&EEEEEEE&EQEEEEEEEEEEEEEEEE&EEEEEEEEEfiEE&EEfiEfiEE&EEEEEEE

EEEEEEEEEEEEERE
EE

EECFEEEEEEEEEEEEEECEEEECEEECEEEEEEREEEE
EFEEEEEECEEEEECEEEEEEEEEEEEEEEEEEE

EEFEEEEEEEEEEEEEEEEEFEEEEEEEEEEEEEEEEE
1
EEEEEE
EEEEFEEEEEEEEEEEECEEFECECEEEEEEEEEEEEEFEEEEEFEEEEEEEEEEEEEEE

EEEEEEEEEEECEEEEFEECEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE

EE‘“d
& ata—C *EEEEEEEEEEEEEEEEEEEEEEEEE‘EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
EEEEEEECEEEEEEEEEEEEEEE
ECEEEEEEECECEEERECEEEECEECEEEEEEEEEEE
FEEECEEEEEEEEEEEEEEEERE
EEEEEEEFEEEEEEEEFEEEEEEEEEECEEE
EEEEEEEEEEEEEEEEEEEEECEEEEEEEEEEEEEEEEFEFEECEEEEEEEEEEREEEERE
EEEEEEEEEfiEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE&EEEEEEEEEEEEEE&EE
EEEEEEEEEEEEEEEEFEEEEEEE
EEEEFEEEEEREEEEEEREEE
EE&EEEEE&&EEEEEEEEfiEEEEEEEEEEEEEEEEEEEEEEEEEEEESEE&EEEEEEEEE
EEEEEEEECEEEEEEFECEECEEEEEEEECEEEEEEEECEEEFEEEEEEEEEEEEEEEEE
EEEEEEEEEE&&EEEEEEEEEEE
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
EE

EEEEEEEEEEEEEEEEEE

EEE

EEEEEQE&EEEEEEEEEE&EEEEEEEEEEEEEEEEE
E
““““““““ EEEEEEE
EEEEEEEEEEEEEEEECEEEFEEEEEEEEEEEEEEEEEEEEEEECEECEEEEEEEEEEEE

INSIDE EDGE
OF BEZEL

RASTER EDGE

Figure

E-7

a=b (+5mm[H.CENT])
c=d (+2mm[H.PHASE] )

Horizontal

Centering

MA.1308-83

Check/Adjustments

Turn

and

(See Figure

brightness
E-15.)

controls

from

left

center

of raster

edge

Measure

distance

from

right

center

raster

edge

within

bezel.

Check

that

each other.

measurements

are

equal

NOTE

If measurements are
the
to
continue

p—
o

limitations,
within
not
preadjustment procedure was
and continue to step 7.

—

Turn

horizontal

distance
distance

a
b

from
from

E.2.6

HORIZONTAL

horizontal

phase.

procedure.
(See
If
measurements
are

(H.

centering

sure
be
completed

CENT)

left center of raster
right center of raster

within 5 mm of each other.

within limitations,
Dphase
horizontal

check/adjustment
Paragraph
E.2.6.)

1is

.
—

raster

distance

WW
*

Measure
bezel.

contrast

visible.

control
to
to

(See Figure E-7.)

until

bezel
bezel

and
are

PHASE

Perform the following steps to check, and if necessary, adjust the

Ensure

that

Paragraph

Terminal

E.l1.6.

Host

Presets
|

are

detailed

1in

Display alignment pattern, which is a screen full of Es.
Invoke this display by typing:
ESC # 8 (See Figures E-7 and

E-8.)

H.CENT
-

g 5320268“0 oog‘%g%

00 0”0“'00;03083% \\

M A-1306-83

. ]

Figure E-8

Horizontal Phase Check/Adjustments
79

Turn
contrast
and
brightness
controls
so
raster
visible.
(See Figure E-15.)
Measure
distance
c¢
from
left center
of
raster
edge
left center of E pattern.

Measure

distance

right

center

Check

that

from

right

center

raster

pattern.

measurements

are

equal

within

edge
of

each

other.
NOTE

If measurements are
continue
to
the
procedure,

(see

within limitations,
rotational
check

paragraph

E.2.7).

measurements are not within limitations,
be
sure
preadjustment
procedure
was
completed and continue to step 7.
-

Adjust
brightness
and
contrast
controls
alignment pattern and raster are visible.

that

|
Turn horizontal phase
(H.
PHASE)
control until distance
from right center of E alignment pattern to right center
of
raster
and
distance
from
1left
center
of
alignment
pattern to left center of raster are within 2 mm of each
other.

—

NOTE

When

you attempt this adjustment,
some
host
system
units
cause
raster
distortion
(discoloration
of
right
raster edge). If this distortion occurs,
adjust
H.PHASE control
so
no
raster
distortion is visible,
then center the
video display to the bezel by adjusting
H.CENT control.

By,

E.2.7

ROTATION

Perform the following

steps to check the rotatlon.

Terminal

that

Ensure

Paragraph

Host

Presets

E.l.6.

Display the alignment pattern, which
Es. Invoke this display by typing:
ESC

are
is a

detailed

screen

full

1in
of

(See Figure E-9.)

Use the scale on the alignment template to ‘make the
following measurements (See Figure E-9.) Find point al
(five columns of Es from the left and one row of Es from
the bottom of
the
alignment pattern). Measure
the
distance from this point to the monitor bezel.
Find point a2 (five columns of Es from the right and one
row of Es from the bottom of the alignment pattern).
Measure the distance from this point to the monitor
bezel.

or within

Check that measurements are equal

3 mm of each

other.

NOTE

Rotation

monitor

not

adjustable.

measurements

are

Replace

the

within

not

limitations.
Continue with
the
procedure if rotation is normal.

EEEE

eee EEEEECEEEEEEEEEEEE
"EEE&EEEEEEEEEEEE’:E

EEEEEE

‘

INSIDE EDGE |

OF BEZEL

Efiee1L
EEEE

;

EEE

a=b (+3mm)}
MA-1308-83

Figure

E-9

Rotational

Check

E.2.8

Perform

RECTANGULARITY

the

following

Ensure

that

Paragraph

ESC

[

and

check

Terminal

Host

all
;

from

rectangularity.

Presets

are

detailed

red
y

(See

lower

upper

screen

right

that

measurements

the
is

pattern.

Figure

right

Measure
from lower
and from upper left

Check

the

E.l.6.

Display
typing:
Measure

steps

this display by

E-10.)

corner,

corner

Invoke

from

pattern

right
to

middle

left corner,
from left middle
corner of pattern to bezel.

maximum
less

than

difference
3

mm.

(See

edge,

bezel.

between
Figure

all

edge,

three

E-10.)
i

NOTE

rectangularity

within

limitations,

continue
to
the
aspect
ratio
check/adjustment
procedure.
(See
Paragraph
E.2.9.)
I1f
not
within
limitations,
be
sure
preadjustment
procedure was completed and continue
to
step

6.
o,

INSIDE EDGE

OF BEZEL

INSIDE EDGE
OF BEZEL
o

als LESS THAN 3mm
b 1S LESS THAN 3mm
MA-O828-83

Figure

E-10

Rectangularity

Check

Turn SIDE PIN control

(Figure E-11)

that left and

right sides of display appear to be vertical without any
bowing when viewed straight on. The maximum bowing in or
out must be less than 3 mm.

SIDE PIN

SIDE VIEW
MA-0B29-83

Rectangularity Adjustment

Figure E-11

ASPECT RATIO

E.2.9

Per form the following steps to check, and if necessary, adjust the

aspect ratio.

Set terminal host presets as follows:
Enter

Display

Clear

Monochrome Display.

Reverse Video

Exit

Local

Set-Up

Put terminal

Type:
ESC

(dark text, light screen)

Set-Up

[(390,240]

[200]

Observe circle for ovalness or

flattening.

(See

E-12.)

If the circle appears abnormal, perform steps 4 through 7.

Figure

RO,

T
R

o 32—
S,

INSIDE EDGE
OF BEZEL

AR,

MA-1308-838

Figure

E-12

Aspect

Ratio

Check/Adjustment
A,

AR,

the
4.

circle

appears

Use

your

abnormal,

alignment

measurements.

(See

perform steps
template

Figure

E-12.)

Subtract

the

sum

monitor
screen)
display.
Example:

al = 26 mm

edge of th@

(al+a2)

from

arrive

a2z = 25 mm

293

through

make

from the center of the left edge of
to the monitor bezel.
Also measure

the center of the right
the monitor bezel.

the

Measure

al+a2

7.
following

the distance

al
the alignment pattern
the distance a2 from

alignment

the

pattern

(the width

width

the

to
the

video

51 mm

Video display width = 293 - 51 mm = 242 mm
6.

The video display width must be within the range of

245

mm.

necessary,

adjust

SIZE

(the

size control) until the video display width
range specified.
(See Figure E-12.)
CAUTION
Do
not

extent

that

the

SIZE
control
to
coil core falls out.

Adjust
V SIZE (the vertical size control)

Type:

ESC

within

the

adjust

improve

235

horizontal

the

appearance

(to

get

the

out

the circle.
ReGIS

the

as necessary to

Graphics mode)

E.2.10

VERTICAL LINEARITY

Perform the following steps to check, and if necessary, adjust the

vertical

linearity.

detailed

Display the alignment pattern, which is a screen full
Es (no reverse video). To invoke this display, type:

that

Ensure

ESC

Visually

Host

Terminal

E.1.6.

Paragraph

the

check

uniform height.

top row

from

linearity

Adjust vertical

(V.

(See Figure E-13.)

necessary.

Figure E-1.)

(See

are

Presets

LIN)

bottom

control

row

to correct

for

E.2.11

Perform

HORIZONTAL

the

following

LINEARITY

steps

check

the

horizontal

1linearity.

detailed

Display the alignment pattern, which is a screen full
Es (no reverse video). To invoke this display, type:

that

Ensure

ESC

Visually

Terminal

Host

Presets

are

E.l.6.

Paragraph

(See Figure E-1.)

check

left

from

right

in center

uniform width.
NOTE

Horizontal

row for

linearity

not

adjustable.

Replace monitor if Es are not of uniform
width. Continue with next check if
normal.

V.LIN
G,

MA-0831.83

Figure E-13

Vertical Linearity Adjustment

E.2.12

FOCUS

perform the following steps to check, and if necessary, adjust the

focus.

Ensure Terminal Host Presets are as detailed in Paragraph

a screen full
Display alignment pattern, which is
(no reverse video). To invoke this display, type:

Check that Es are clearly defined over entire screen.
NOTE

(See Figure E-1.)

ESC #

pattern

uniformly

clear

over

Figure

E-14.)

until

entire screen, continue purity check.
If focus is
(See Paragraph E.2.13.)
be sure preadjustment
satisfactory,
procedure was completed and continue to
step

Turn FOCUS control

(See

uniformly sharp over entire screen.

y
&

oo
L
Lo
£

i eL
Y
T
a5
T

o s

MA-DB32-83

Figure E-14

Focus Adjustment

the

are

E.2.13

Perform

1.
2.

COLOR

the

PURITY

following

steps

to check

color

purity.

Host
Presets
are
as detailed
Ensure
that
Terminal
Paragraph E.1l.6.
Display full screen red test pattern by typ1ng~
ESC [ 4 ; 11 ¥y
that
screen
1is
evenly
red
over
entire
Check
without any other colors present.
NOTE

does

not

for

ten minutes

monitor

off

and

recheck

has

warmed

cabinets
relocate
device.

the

for

appear
color

normal,

then

after

turn

anltor

5 minutes.

Color

purity

not

CONVERGENCE
following steps

Set

terminal
Enter

Put

or
structural
beams.
If
so,
either monitor or offending

adjustable.

Replace

monitor if normal color is unobtainable.
Continue to next procedure if normal.

the

color

Make
certain
there
are
no
strong
magnetic fields near the monitor, such
as motors,
printers, magnetized
filing

E.2.14
Perform

host

check

presets

convergence.
follows:

Set-Up

terminal

Local
Clear

Display

Reset

Terminal

Normal Video (light
Monochrome Display

text,

dark

screen)

VT10@ Mode.
Ex1t Set-Up
oS

2.
3.

Display a full screen of white Es by typing ESC # 8.
View center of pattern of Es at arm's length. There
should not be any color fringing.
NOTE

Some color fringing is to be expected at
outer edges of display. This fringing
should not be objectionable at a normal
viewing distance.

If E characters are poorly converged,
turn monitor off for ten minutes then
turn it on and recheck the E character
display for fringing after your monitor
has warmed up for 5 minutes.

Make sure there are no strong magnetic
fields near the monitor, such as motors,
printers or magnetized filing cabinets.
I1If so relocate either monitor or the
offending device.

Replace
Convergence is not adjustable.
monitor if a normal display cannot be
obtained. Continue to next procedure if
display acceptable.

E.2.15

WHITE

Perform

white
l*

BALANCE

the

following
balance.
Ensure

steps

Terminal

Host

check,

necessary,

Presets

are

detailed

ad]ust

the

[

E.1l.6.

Paragraph
I

NOTE

you

perform

the

SOlld

white

Display
ESC

[

Vary

are

;

contrast

Figure
Check

test

not attempt

procedure.

patt@rm

typing:

white

screen

black.

brightness

Set

contrast

that

y
control

Set

Check

blind,

following

between

maximum

E-15.)
that

gray

color

goes

frwm

whlte

and

mlnlmum.

through

(See

shades

control

raster

maximum.

minimum.

white.

SUB G.DRIVE

SUB B.DRIVE
SUB CONTRAST

CONTRAST
BOTTOM VIEW WITH
MONITOR ON SIDE

BRIGHTNESS

MA-0833-83

Figure

E-15

Presets

(part

8a.

8b.

Restore terminal presets as described in Paragraph E.l.6.
Display color bar test pattern by typing:
ESC

[

;

4 vy

Vary contrast control between maximum and minimum.

10.

11.

Check that all colors fade evenly and no one color drops
out before any others do at usable intensity levels.
With brightness and contrast controls at minimum check
that the entire screen is black (no dlsplay or raster is
visible).
NOTE

If your monitor
passed
white balance
if
monitor
reassemble
procedure,
preadjustment
(Perform
necessary.
procedure, Paragraph E.2.2 in reverse.)
If you experienced difficulty be sure

preadjustment procedure was completed
and proceed to Paragraph E.2.15.1.
E.2.15.1

wWwhite Balance Presets

Perform the following steps to preset the white balance.
Turn BRIGHTNESS control to maximum.
Turn CONTRAST control

Set

monitor

controls

facing

its

up.

to minimum.

side

with

(See Figure E-15.)

BRIGHTNESS

NOTE

The
display may
show
signs of
color
impurity
or poor convergence. Turn off
monitor for ten minutes, then turn it on
again and wait 5 minutes for monitor to
warm

up.

Perform the remaining procedures with
the monitor on its side. Only move the
monitor
to
access
the
service
switch
(see Figure E-16), then place it back on
its side.

and

CONTRAST

G.DRIVE
~

B.DRIVE

)

SUB BH!GHTNESST\P:‘%_—E

=‘

I| (ACCESSED THROUGH

|l SPACE BETWEEN
' TOP AND REAR

IIPANEL)

SERVICE

SWITCH '—fi :

VIEW OF MONITOR REAR
WITH MONITOR ON SIDE

MA-08B34-83

Figure

E-16

Presets

(part

Turn

SUB-CONTRAST

Turn

sub-green

(SUB-B

Turn

DRIVE)

green

controls
Turn
Turn
and

control

drive

controls

drive

fully

(G.

midrange.

(SUB-G

DRIVE)

and

sub-blue

DRIVE)

and

counterclockwise.

blue
(See

drive

Figure

(B.

DRIVE)

E-15.)

SUB-BRIGHTNESS control fully counterclockwise.
red background
(R. BKG), green background
(G.
blue

drive

fully clockwise.

background

(B.

BKG)

controls

BKG),
fully

counterclockwise.
Turn
19.

11.
12.

SCREEN

control

fully

clockwise,

then

back

control

off 45 degrees.
Set service switch to SERVICE position.
Disconnect video signal cables.
Slide impedance switch to 75-ohm position.

NOTE

The

screen

should

totally

Continue

white

balance

procedure,

(Paragraph

E.2.15.2).

black.

cutoff

92
fo

E.2.15.2
White Balance Cutoff
Perform the following steps to adjust
Turn

red

line

BKG

control

just

counterclockwise
Turn

appears

BKG

until

the

Turn

appears

the

line
BKG

until

control

the

line

balance cutoff.

Figure

screen.
just

screen.

green

Then back control

Then

until

turn

blue

w :

Eo
O

\ 4

te
£t
- B

L. e

-b o

fi §%§§é

—gyt

)

MA-0835-83

Figure

E-17

Cutoff

control

Adjustment

line

just

line

just

counterclockwise

NOTE
The
screen
should
show a
red
raster.
Continue to white balance white raster
procedures (Paragraph E.2.15.3).

SERVICE

until

counterclockwise

control

until the line just disappears.
Set service switch to NORMAL position.

SWITCH

turn

disappears.

until

clockwise

E-17.)

Then

disappears.

control

the

(See

clockwise

screen.

just

white

clockwise

appears

AP I

the

Oy,

E.2.15.3

Perform

White Balance White Raster

following

the

balance

white

the

adjust

steps

whlte

raster.

NOTE

Read steps 1 through 3 before startlnq.

Adjust BRIGHTNESS control to display a dim red raster.
NOTE

If you set

red

the

as dim

raster

yau

can work with, steps 2 through 4 w1ll be

easier to perform.

Turn SUB-G DRIVE control (See Figure E-18.) just until no
red

is visible

NOTE

in the center of the screen.

will

stop

increasing green

will

turn

yellow,

red

with

start

You

screen;

green.

then

just

You

must

the center

of the screen goes from a yellow tint to
a green tint. If you do this correctly,
the screen will have a green tint but
not

brilliant

green

Flgure

E-18.)

level

The

green.

_—

is critical.

Turn

SUB-B

center

(See

DRIVE control

the

raster

turns

gray.

Jjust

until

SUB G.DRIVE

QOOOQQ@QI

30 0,0 0 00 0 Ong

SUB B.DRIVE

N
Y0?070%75%0%
E...J

woooooooo

coooo000
o0
oo

J
,'

||@1

||]

s
O

MA-0836-83
e

Figure E-18

White Raster Adjustment

(part 1)

—
)

NOTE

You should be able to get gray easily by
adding blue. If you cannot get gray, it
is because you have either too little or
too much green.

A red or

purple tint means

there

too

there

1is

too

little green.

A blue or green tint means
much green.

BRIGHTNESS

Slowly

turn

at all

BRIGHTNESS

control

from maximum

minimum

and make sure the raster goes from white to gray. (See
Readjust SUB-G DRIVE and SUB-B DRIVE
Figure E-19.)
controls as necessary to obtain a white and gray raster
levels.

1/2 TURN
FROM

MINIMUM

BRIGHTNESS

SS
SUB BRIGHTNE===

MA-QB3I7-83

Figure E-19

White Raster Adjustment

(part 2)

Oy,

Turn BRIGHTNESS control

to minimum,

toward maximum.

Make

sure CONTRAST control

set

then turn

1/2 turn

to minimum.

NOTE

The

screen should be totally black.

Turn SUB-BRIGHTNESS control
raster

appears.

Adjust

SUB-BRIGHTNESS

(Figure E-19)

control

counterclockwise

entire screen goes black.
balance
white
to
Continue
(Paragraph
E.2.15.4

Perform

video.

clockwise until

white

wvideo

until

the

procedures

E.2.15.4).

White Balance White Vvideo
the following steps to adjust

the

white

balance

white
G

NOTE

Read steps 1 through 6 before starting.
Reconnect video

signal cables.

Turn BRIGHTNESS control to full minimum.
Turn CONTRAST control so that video is dim.
NOTE

If you set the video as dim
work with,
steps 5 through
easier
4a.
4b.

to perform.

Restore
Display

terminal presets
solid white test

ESC

;

[

as you can
7 will be

as described in Paragraph
pattern by typing:

E.1.6.

—

NOTE

The screen should display red video.
Turn G.
is

DRIVE control

visible

the

(See Figure E-20¢)

center

the

just until

red

"y,

screen.
A,

:@%m
&
ke

;Ié

i[
G.DRIVE

B.DRIVE

p—

i 0089@' 200,
O

MA-DB38-83

Figure

E-20

White Video

Adjustment
s

NOTE

Step
5
1s
critical.
Like
step
2
in
Paragraph E.2.15.3, you will start with
a red screen; it will turn yellow, then
green.
You must
stop
increasing green
just as the screen center goes from a
yellow tint to a green tint. If you do
this correctly, the screen will have a
green tint but not a brilliant green.
6‘

Turn B. DRIVE control just
the center of the screen.

until

the

raster

turns gray

NOTE

You should be able to get gray easily by
adding blue. If you cannot get gray, it
is because you have either too little or
too much green.

A red or purple
little green.

tint

means

you

have

too

A blue

tint

means

you

have

too

much

green

green.

Slowly turn CONTRAST control from maximum to minimum and
make sure the video turns from white to gray. Readjust B.
DRIVE and G. DRIVE controls as necessary to get white and
gray at all contrast levels in the center of the screen.
8b.

Restore terminal presets as described in
Display color bar test pattern by typing

10.

Check the color bars for proper color.
Slowly turn CONTRAST control from maximum

8a.

make
sure
no
color
drops
out
colors should fade equally).

before

Paragraph
ESC [ 4 ;

to minimum and
others
(all

the

NOTE

If green drops out, G. DRIVE is set
low. If blue drops out, B. DRIVE is

too
set
too low. If red drops out, G. DRIVE and
B. DRIVE controls are set too high or R.
BKG is set too low.
(Check G. DRIVE and
B.
DRIVE
first.)
If
the
R.
BKG
is
misadjusted,
perform
the
entire
white
balance adjustment procedure again. (See
Para.

E.2.15.1.)

E.1l.6.
4 vy.

Sub Contrast Adjustment and Final Checks
E.2.15.5
Perform the following steps to adjust the sub-contrast
final
1.

Set

make
e

terminal

Enter

Put

)

host

presets

follows:

Set-Up

terminal

Local

Clear

Reset Terminal
Normal video (light

Monochrome

Display

text,

dark

screen)

Display

VT100 Mode.
Exit Set-Up

]

Display a
$

Ul
W N

and

checks.

full screen of white Es by typing ESC # 8.
Turn BRIGHTNESS control until raster just disappears.
Turn CONTRAST control to maximum.

Adjust

SUB-CONTRAST

control

intensity without distortion

(Figure

E-21)

blooming

maximum

of display.

[

SUB CONTRAST

MA-0B39-83

Figure E-21

Sub-Control

Adjustment

€.
-

5
)

Select the white screen test pattern by typing:
ESC [ 4 ; 13 vy.

With contrast control at minimum,
control
to

slowly turn BRIGHTNESS

from maximum to minimum while you check for white

gray BACKGROUND RASTER.

NOTE

you

cannot

get

correct

background

p—
o
—

raster at this point, either you did not
perform the cutoff procedure or white
raster
procedure
correctly,
or
the
monitor is faulty.
Perform the entire

(Paragraphs E.2.15.1 through E.2.15.3.).

o
—

white

balance

procedure

again

With brightness control set for raster extinction, slowly
turn CONTRAST control from maximum to minimum while you
check

for white

to gray VIDEO.

NOTE

point, either you did not perform the
white video procedure correctly, or the
monitor
is
faulty.
Perform the white
(Paragraph
again
procedure
video

If you cannot get correct video at this

E.2.15.4.).

.
oo

E.3.0

RECOMMENDED SPARES

LIST

The following is a 1list of replaceable parts and accessories
recommended for maintaining the VR241-A Color Video Monitor.

Description

—

Color monitor

|
e
¢

Screen cleaner

(whole option)

VR241 Adjustment

29-24791-00

Tool

Alignment tool (yellow)
Hex-core alignment tool
Fuses (2.5 amp)
RGB signal

VR241-A

(1 oz)

29-24746-00

29-10144-900
29-23190-00
90-08387-00

(white)

cable

17-00284-00

E.4.0
PHYSICAL/FUNCTIONAL DESCRIPTION
This
chapter
describes
how
to
find
and
controls

E.4.1
The

and

VOLTAGE

voltage

color

how

find

SELECTION

selection

monitor.

The

the

alignment

the

external

SWITCH

switch

operate
points.

has

(Figure
two

[

E-22)

positions:

115

the

back

and

230

of
V.

the
i

VOLTAGE SELECT SWITCH

®
P

FUSE
.

POWER CONNECTOR

L
g

fJ//
MA-(840-83

Figure

E-22

Power

Controls

100

E.4.2

POWER

SWITCH

The
power
switch
(Figure
E-22)
1is
on
the
back
monitor. Pressing the 1 turns on the color monitor.
turns

off

the

of
the
Pressing

color
the 0@

color monitor.

E.4.3
FUSE
The fuse (Figure E-22)
is on the back of the color monitor. It is
a 2.5 A, 250 VvV fuse, set in 1/4 inch by 1-1/4 inch fuse carrier
for the United States. A 2.5 A, 250 V set in a 5 mm by 20 mm fuse
carrier is also packed with the VR241-A for use outside the United
States.

CAUTION

Do not use the
fuse carrier in
E.4.4

POWER

5 mm by 20 mm fuse
the United States.

INDICATOR

The color monitor has one indicator
this indicator light is on:

°
®
®
®
E.4.5

for

power

(Figure

E-23).

When

AC power is applied.
Power switch is ON.
Fuse

Power

1is

good.

is being

CONTRAST

This control
intensity for
E.4.6

and

applied
PICTURE

to monitor

INTENSITY ADJUSTMENT

(Figure E-23)
allows
viewing preference.

BRIGHTNESS

circuits.

BACKGROUND

you

adjust

the

INTENSITY ADJUSTMENT

This control (Figure E-23)
allows you to adjust
cutoff, which compensates for room lighting.

the

PICTURE

RASTER

BLACK SCREEN

+ )

CONTRAST

E{"L—\ BRIGHTNESS
POWER INDICATOR
MA-DBBO.83

Figure

E-23

Video

Controls

101

picture's

and

Indicators

raster

to
|

E.4.7
SYNCHRONIZATION AND IMPEDANCE
The synchronization switch (Figure E-24)
the
monitor
system unit.

line or
signals
have
Hosts

the

on
to

receives
the
synchronization
signal
The monitor can receive the signal on

from

the

line

host

the green video
the external sync line. Hosts that provide three video
the
color monitor
(synchronization
on green)
should

synchronization

that

SWITCH SETTINGS
determines on which

provide

switch

four

video

(external synchronization)
should
in the EXT (external) position.

the

INT

(internal)

have

synchronization
|

the

position.

signals

color

monitor

switch

SET THE SYNCHRONIZATION AND IMPEDANCE SWITCHES
ON COLOR MONITOR(S) TO MATCH ARRANGEMENT.

SYNCHRONIZATION
SWITCH

SWITCH
—

———TM

‘

RED

GREEN

}]

BLUE

CONNECT
TO

HOST

SYSTEM UNIT
i

RED

GREEN

NNECT TO
GREEN :U E{gm

BLUE

sysTEM UNIT

szi%g

EXTERNAL VIDEO SYNC

RED

>
@

_GREEN

BLUE

VIDEO

CONNECT
TO

N||

L HOST
|

sysTEmuniT

EXTERNAL

VIDEO

CP@

RED

@ Po—]reD

syne

CONNECT
TO

GREEN

SYSTEM UNIT

(o—BLUE

SYNC

()fii%g

BLUE

HOST

MA-0881-83

Figure

E-24

Synchronization
Switch Settings

102

and

Impedance

The
impedance switch allows you
correctly in either termination or
®

to operate the color
loop-through modes.

Termination mode is when your color monitor is the only
monitor connected to the host, or your monitor is the
last monitor

string

of monitors connected

In the termination mode the
the 75 ohm position.
s

monitor

a host.

impedance switch should be

Loop-through
mode
1is
when
your
monitor
1is
connected
between a host and another monitor, but is not the last
monitor
connected.
In
loop-through mode
the
impedance
switch should be in the HIGH position.

E.4.8

ALIGNMENT

ADJUSTMENT

LOCATIONS

AND CONTROL

DEFINITIONS

Figure E-25 shows the VR241-A alignment point locations. Table E-6
lists and defines the video alignment controls. Table E-7 lists
and defines the white balance alignment controls.

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Figure E-25

Adjustment Locations
103

Table

E-6

Video

Alignment

Controls

Control

Paragraph

Definition

H.
V.

HOLD
HOLD

E.2.3
E.2.3

Horizontal synchronization
Vertical synchronization

CENT

E.2.4

Vertical

CENT

E.2.5

Horizontal

raster

PHASE

E.2.6

Horizontal

video

E.2.8

Rectangularity

Aspect
Aspect

SIDE

H.
V.

SIZE
SIZE

E.2.9
E.2.9

LIN

E.2.10

Vertical

E.2.12

video

FOCUS

video

ratio
ratio

centering
and

video

centering

raster
alsiiibingy,

horizontal size
vertical size

linearity

focus

isisinitugy:

Table

E-7

White

Balance

Alignment Controls

Adjustment

Paragraph

SCREEN

E.2.15.1

Definition

Presets bias
2 (G2)

CRT

control

E.2.15.1

Selects service
adjustment

for

cutoff

BKG
G. BKG
B. BKG
SUB-G DRIVE

E.2.15.2

Sets

cutoff

E.2.15.2
E.2.15.2
E.2.15.3

Sets
Sets
Sets

cutoff
cutoff
amount

SUB-B

E.2.15.3

Sets

SERVICE

SWITCH

grid

point

of
point of
point of
of green

red gun
green gun
blue gun
background

raster

DRIVE

amount

blue

background

raster

NOTE

The
SUB-BRIGHTNESS

red

background

raster

E.2.15.3

Sets

fixed.
the

range

user

DRIVE

E.2.15.4

brightness control
Sets amount of green

DRIVE

E.2.15.4

Sets

SUB-CONTRAST

blue

video

red

video

ity

video
iy,

NOTE

The

amount

fixed.

Sets range of user contrast

E.2.15.5

control

[

104

Printed in U.S.A.

EK-VT240-PS-001