Ibm 5291 Setup guide

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I

BM

5291

Display

Station

Maintenance

Information

and

Maintenance

Analysis

Procedures

Manual

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IBM

5291 Display

Station

Maintenance

Information

and

Maintenance

Analysis Procedures

Manual

Glossary

Legend

Using Manual

MAP

Charts

Keyboard

Unit

Display

Unit

Lower Unit

Power

Supply

Switches

Diagnostics

CE

Switch

Free Key

Online Tests

(600)

Index

I

·'

I

Preface

This manual is used by customer engineers

for

servicing

the 5291 Display Station. Customer engineers using this

manual are assumed to have completed the 5291

Display Station education course.

This manual has

two

major sections: maintenance

analysis procedures (MAPs) and maintenance

information. The MAPs section contains map charts

to

help you isolate a problem

to

a failing part. The

maintenance

information

section contains service

information. This section

is

divided

into

six subsections:

using the maintenance information, keyboard unit,

display unit,

lower

unit, display station operation, and

online tests.

Definitions

of

terms

and abbreviations

that

are

not

common, but are used in this manual, are in the

Glossary

of

Terms and Abbreviations.

There are several DANGER and CAUTION notices in this

manual. You can use the blank lines

below

each notice

to

translate it

into your

own

words. The locations

of

these notices are listed in the

Safety

section.

Second Edition

(December

1981)

Related Publications

Related information can be found in the

following

manuals:

IBM Synchronous Data Link Control General

Information,

GA27-3093

• IBM

5250

Information Display System Planning and

Site Preparation Guide,

GA21-9337

• IBM

5250

Information Display System Reference Card,

GX21-9249

• IBM

5291

Display Station Setup Procedure,

GA21-9408

• IBM

5291

Display Station

I/PAR

Code Guide and

CE

Log, ZY31

-0642

This

is a

major

revision of, and makes

obsolete,

SY31-0641-0.

Changes are

periodically

made

to

the

information

herein;

these

changes

will

be

reported

in

new

editions

of

this

publication.

Use

this

publication

only

for

the

purposes

stated

in

the

Preface.

Publications

are

not

stocked

at the address

below.

Requests

for

copies

of

IBM

publications

and

for

technical

information

about

the

system

should

be

made

to

your

IBM

representative

or

to

the branch

office

serving

your

locality.

This

publication

could

contain

technical inaccuracies

or

typographical

errors. Use

the

Reader's

Comment

Form at the back

of

this

publication

to

make

comments

about

this

publication.

If

the

form

has been

removed,

address

your

comments

to

IBM

Corporation,

Publications,

Department

245, Rochester,

Minnesota

55901.

IBM

may

use and

distribute

any

of

the

information

you

supply

in any

way

it

believes

appropriate

without

incur;ing

any

obligation

whatever.

You may,

of

course,

continue

to

use

the

information

you

supply.

©

Copyright

International

Business

Machines

Corporation

1981

DANGER

AND

CAUTION

NOTICES

Throughout

this

manu;il,

the

word

DANGER

1s

used

to

inform

the

CE

of

an

action

that

could

cause

a

persona!

iniury.

The

word

CAUTION

1s

used

to

inform

the

CE

of

an

action

that

could

damage

the

machine

or

affect

the

running

of

a

customer

program.

DANGER

Notices

DANGER

notices

appear

111

the

following

maintenance

procedures:

230

Display

Ad1ustments

242

Display

Unit

Top

Cover

343

AC

Capacitor

344

Power

Supply

Transformer

450

Station

Protector

The

IBM

5291

Display

Station

has

the

following

spec1f1c

dangers:

DANGER

• Line

voltage

1s

present

at

the

power

supply

and

the

display

assembly.

High

voltage

1s

present

at

the

cathode-ray

tube.

•

The

cathode-ray

tube

could

implode

if

1t

1s

hit

or

1f

it

falls.

Safety

CAUTION

Notices

CAUTION

notices

appear

in

the

following

maintenance

procedures:

347

Planar

450

Station

Protector

Safety

iii

CE

SAFETY PRACTICES

All

Customer

Engineers are expected

to

take

every

safety

precaution

possible and

observe

the

following

safety

practices

while

maintaining

IBM

equipment:

1 You

should

not

work

alone

under

hazardous

conditions

or

around

equipment

with

dangerous

voltage.

Always

advise

your

manager

if

you

MUST

work

alone.

2. Remove all

power,

ac

and de,

when

removing

or

assembling

major

components,

working

in

immediate

areas

of

power

supplies,

performing

mechanical

inspection

of

power

supplies,

or

installing

changes

in

machine

circuitry.

3.

After

turning

off

wall

box

power

switch,

lock

it

in

the

Off

position

or

tag

it

with

a

"Do

Not

Operate"

tag,

Form

229-1266.

Pull

power

supply

cord

whenever

p,assible.

4.

5.

6.

7.

When

it

is

absolutely

necessary

to

work

on

equipment

having

exposed

operating

mechanical

parts

or

exposed

live electrical

circuitry

anywhere

in

the

machine,

observe

the

following

precautions:

a.

Another

person

familiar

with

power

off

controls

must

be in

immediate

vicinity.

b.

Do

not

wear

rir.\;js.

v·1rist

watches,

chains, bracelets,

or

metal

cuff

link:..

c.

Use

only

insulated

pliers and

screwdrivers.

d. Keep one

hand

in pocket.

e.

When

using

test

instruments,

be certain

that

controls

are

set

correctly

and

that

insulated

probes

of

proper

capacity

are used.

f.

Avoid

contacting

ground

potential

(metal

floor

strips,

machine

frames, etc.).

Use

suitable

rubber

mats,

purchased

locally

if

necessary.

Wear

safety

glasses

when:

a.

Using

a

hammer

to

drive

pins, riveting, staking, etc.

b.

Power

or

hand

drilling,

reaming,

grinding,

etc.

c.

Using

spring

hooks,

attaching

springs.

d. Soldering,

wire

cutting,

removing

steel

bands.

e.

Cleaning

parts

with

solvents, sprays, cleaners,

chemicals, etc.

f.

Performing

any

other

work

that

may

be hazardous

to

your

eyes.

REMEMBER-THEY

ARE YOUR EYES.

Follow

special

safety

instructions

when

performing

specialized tasks,

such

as

handling

cathode

ray

tubes

and

extremely

high

voltages. These

instructions

are

outlined

in

CEMs

and

the

safety

portion

of

the

maintenance

manuals.

Do

not

use

solvents,

chemicals, greases,

or

oils

that

have

not

been

approved

by

I

BM.

8.

Avoid

using

tools

or

test

equipment

that

have

not

been

approved

by

IBM.

9.

Replace

worn

or

broken

tools

and

test

equipment.

10.

Lift

by

standing

or

pushing

up

with

stronger

leg

muscles-this

takes

strain

off

back

muscles.

Do

not

lift

any

equipment

or

parts

weighing

over

60

pounds.

11.

After

maintenance, restore all

safety

devices, such as

guards,

shields, signs, and

grounding

wires.

12. Each

Customer

Engineer is

responsible

to

be

certain

that

no

action

on

his

part

renders

products

unsafe

or

exposes

customer

personnel

to

hazards.

13. Place removed

machine

covers

in a

safe

out-of-the-way

place

where

no

one

can

trip

over

them.

14. Ensure

that

all

machine

covers are in place

before

returning

machine

to

customer.

iv

Safety

15.

Always

place

CE

tool

kit

away

from

walk

areas

where

no

one can

trip

over

it;

for

example,

under

desk

or

table.

16.

Avoid

touching

moving

mechanical

parts

when

lubricating,

checking

for

play, etc.

17.

When

using

stroboscope,

do

not

touch

ANYTHING-it

may

be

moving.

18.

Avoid

wearing

loose

clothing

that

may

be

caught

in

machinery.

Shirt

sleeves

must

be

left

buttoned

or

rolled

above

the

elbow.

19. Ties

must

be

tucked

in

shirt

or

have a

tie

clasp

(preferably

nonconductive)

approximately

3 inches

from

end. Tie chains are

not

recommended.

20.

Before

starting

equipment,

make

certain

fellow

CEs and

customer

personnel

are

not

in

a

hazardous

position.

21.

Maintain

good

housekeeping

in area

of

machine

while

performing

and

after

completing

maintenance.

Knowing

safety

rules is

not

enough.

An

unsafe

act

will

inevitably

lead

to

an

accident.

Use

good

judgment-eliminate

unsafe

acts.

ARTIFICIAL RESPIRATION

General Considerations

1.

Start

Immediately-Seconds

Count

Do

not

move

victim

unless

absolutely

necessary

to

remove

from

danger.

Do

not

wait

or

look

for

help

or

stop

to

loosen

clothing,

warm

the

victim,

or

apply

stimulants.

2. Check

Mouth

for

Obstructions

Remove

foreign

objects.

Pull

tongue

forward.

3. Loosen

Clothing-Keep

Victim

Warm

Take care

of

these

items

after

victim

is

breathing

by

himself

or

when

help

is available.

4. Remain in

Position

After

victim

revives, be ready

to

resume

respiration

if

necessary.

5.

Call a

Doctor

Have

someone

summon

medical

aid.

6.

Don't

Give

Up

Continue

without

interruption

until

victim

is

breathing

without

help

or

is

certainly

dead.

Rescue Breathing for Adults

1.

Place

victim

on

his

back

immediately

2. Clear

throat

of

water,

food,

or

foreign

matter.

3.

Tilt

head back

to

open

air passage.

4.

5.

6.

7.

8.

9.

Lift

jaw

up

to

keep

tongue

out

of

air passage.

Pinch

nostrils

to

prevent

air leakage

when

you

blow.

Blow

until

you

see

chest

rise.

Remove

your

lips and

allow

lungs

to

empty.

Listen

for

snoring

and

gurglings-signs

of

throat

obstruction.

Repeat

mouth

to

mouth

breathing

10-20

times

a

minute.

Continue

rescue

breathing

until

victim

breathes

for

himself.

Thumb

and

finger

positions

Final

mouth-to-

mouth

position

SAFETY

DANGER and CAUTION Notices

DANGER Notices .

CAUTION Notices

CE

Safety Practices .

GLOSSARY OF

TERMS

AND

ABBR£VIATIONS

LEGEND

......

.

USING

THIS

MANUAL

MAPS

SECTION . . .

Using the MAPs

Normal Conditions

After

Power On

Start . . . . . . . . . . . . . .

Normal Conditions

After

Power On

MAP

Chart 1

MAP

Chart 2

.........

.

MAINTENANCE

INFORMATION

Using the Maintenance Information

I

100

Keyboard Unit

.............

.

110 Description and Parts Location . . . . . .

140 Keyboard and Keyboard Cable Removal and

Replacement Procedure

200 Display Unit . . . . . . . . . . . . .

230 Display Adjustments . . . . . . . .

240 Display

Unit

Removal and Replacement

Procedures . . . . . . . .

300

Lower Unit

.........

.

310

Description and Parts Location

330 Power Supply Data . . . . .

340

Lower

Unit

Removal and Replacement

Procedures . . . . . .

420 II0 Assembly Switches .

450

Station Protection

520

Power-On

Diagnostics

525

CE

Test

Switch

530 Free Key

Mode

600

Online Tests

...

610

Online Tests Overview

620 Online Tests Displays

630

Sign-On

Procedure .

640 Error History Table

INDEX

iii

iv

vii

xi

1-1

2-1

2-2

2-3

3-1

3-2

3-5

3-8

3-11

3-15

3-19

3-28

3-29

3-30

3-32

3-33

3-34

3-35

3-51

3-52

X-1

Contents

I

Contents v

This

page

is

intentionally

left

blank.

vi

Contents

address

switches:

Switches

that

permit

the setting

of

a discrete address

for

each device on a system cable

(line). These switches are

1,

2,

and 3 on the

switch

block at the rear

of

the display station. See reference

420.

anode:

The high voltage connector on the

cathode-ray

tube.

attribute:

A characteristic

that

controls

how

data is

displayed on the display screen. For example, the

attributes

of

a display field include blinking, high

intensity, and reverse image.

bezel: The mounting frame

for

the

cathode-ray

tube

in

the display unit.

blink

attribute:

An

attribute

of

a display field

that

causes the characters

to

flash.

blink

or

blinking:

Flashing.

brightness

control:

A potentiometer on the CRT

PC

board

that

controls raster brightness. This control is

not

accessible

to

the operator. See reference 230.

Brightness

control

(operator):

A potentiometer on the

underside

of

the Display

Unit

for

adjusting the

brightness

of

the data on the display screen. This

control is accessible

to

the operator. See reference 230.

Cable

Thru:

A function

that

permits multiple display

stations

or

printers

to

be attached serially

to

a system

cable.

callout:

A character, number,

or

name used

to

identify

a particular part

of

a figure.

character

set:

A

group

of

characters contained

in

a

character generator. See reference 620.

Cmd

key:

The command key on the keyboard

that

is

used

to

select command functions.

column

separator:

A

dot

that

separates all the

characters in a field

of

data.

Glossary

of

Terms

and

Abbreviations

command

function

keys:

The 14 keys

in

the

top

row

of

the display station keyboard

that

are used

with

the

Cmd (command) key

to

request functions.

controller:

A device

that

controls the operation

of

one

or

more input

or

output

devices.

CRT:

Cathode-ray tube.

field

attribute:

The control characters

that

describe a

displayed field. For example, a displayed field can be

intensified, reversed, underscored,

or

made

to

blink.

FRU: Field-replaceable unit.

hex:

Hexadecimal.

1/0:

Input/

output.

ID:

Identification.

implode:

To break inward suddenly.

Ins

key:

The key on the keyboard

that

is

used

to

select

insert mode.

IPL: Initial program load. The

first

machine program

operation after

power

on.

Keylock

RPQ: A lock and key

that

prevents the use

of

the display station.

keystroke:

The action

of

pressing a key on the

keyboard.

KU: Keyboard

unit.

LC: Line check.

line

check:

A check

for

errors

that

occur during the

transmission

of

data

from

the system controller

to

the

display station.

LU: Logic unit (planar).

mandatory:

Something

that

must

be done

or

must be

present.

menu:

A list

of

options

that

can be selected.

Glossary

vii

I

.-

~

( .

metric:

A decimal system

of

measurement based on

the meter

as

a standard

of

measurement.

mm:

Millimeter. One thousandth

of

a meter.

N/C:

Pertains

to

a

switch

setting; normally open.

N/0:

Pertains

to

a

switch

setting; normally open.

network:

All

of

the

work

stations and associated

cabling attached

to

a controller.

online

tests:

A series

of

tests

that

can be requested

from

the system after

power

on and before sign on.

See reference 600.

option:

One

of

the items listed on a display screen

menu.

overview:

A short description

which

is general

in

scope.

PC: Printed circuit.

planar:

The basic printed circuit electronic board used

in

the display station.

poll:

A method the controller uses

to

determine

if

a

display station is ready

to

send

or

receive data.

POR: Power on reset.

port:

The place where a cable is connected

to

a

controller.

protector:

A device

that

aids

in

preventing injuries

to

persons

or

damage

to

machines.

raster:

The image on the

cathode-ray

tube

(CRT)

that

is

made by the action

of

the CRT electron beam

as

it

scans across the area where data is displayed.

Normally, the intensity

of

the raster is not high enough

to

be visible. However, the raster can be displayed by

adjusting the brightness control on the CRT circuit

board. See reference 230.

replace:

To exchange something;

for

example, replace a

failed part

with

a

new

one.

required:

See mandatory.

_t.

viii Glossary

retrace

lines:

The lines

that

appear on the display

screen when the display adapter returns the trace

to

the

upper

left

corner

of

the display screen. Retrace lines are

normally

not

displayed. See reference 230.

ripple:

Small waves present on

DC

voltages.

rolling:

Pertains

to

movement

on a display screen; the

movement can

be

horizontal, vertical.

or

a combination

of

both.

SA:

System available.

shorting:

Making

an

electrical short circuit.

sign

on:

A

log-on

procedure performed

at

a display

station; the procedure can include entering the

sign-on

command, a password,

or

other user-specified security

information.

slot:

A narrow opening

or

groove.

socket:

The connectors on the display station

to

which

cables are connected.

Sys

Req

key:

The key

that

is used

to

send a request

directly

to

the system. See reference 600.

TB:

Terminal block.

terminator

switch:

The switch used

to

terminate the

customer system cable

at

the last display station or

printer

in

a series. See reference 423.

twinaxial

cable:

A shielded,

twisted-pair

cable

that

connects a display station

or

printer

to

a controller

typamatic

key:

A repeat action key on the keyboard.

U.S.: United States.

undefined:

The meaning is

not

known

or

described.

underscore:

A line under all positions

of

a field.

Underscore

is

controlled

by

an attribute.

undisplayable

character:

A valid hexadecimal character

code, but the character cannot be displayed on the CRT.

See reference 620, step A2.

Vac:

Volts alternating current.

Vdc:

Volts direct current.

-

---

-

--

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

verification: Testing an operation

or

machine.

video: Pertains

to

the data displayed on the screen.

yoke

assembly: The assembly on the back

of

the CRT,

that

contains the horizontal and vertical deflection coils

and the centering rings. See reference 230.

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

-------

--

______

:_

___

:__

I

.

I

Glossary

ix

I

This page is intentionally

left

blank.

x Glossary

The

following

symbols

are used

in

flowcharts

and

figures

throughout

this manual.

D Display Screen

c ) Start and End

of

Flowchart

CJ

Off-Page

Connector

0

On-Page

Connector

<>

Decision

Block

c Comment

Block

D

Information

Block

Legend

--

Off

~On

}

Swit'h

:!:=:l

N/C

Contacts

~

N/O

Resistor

J!

Ground

]lit

Transformer

Legend

xi

I

xii Legend

This manual has been designed

to

aid you

in

isolating a

problem

to

a field replaceable

unit

(FRU) and then

to

remove

and replace

that

unit.

The

MAPs section aids

you

in isolating the

problem

to

a

failing

FRU and

the

Maintenance Information section

contains

adjustment

procedures, removal and

replacement

procedures, and

diagnostic

and online

test

information.

You

should

first

use

the

MAPs section

to

identify

the

failing

FRU and then

go

to

the referenced maintenance

information

for

the suitable repair action.

No

scheduled preventive

maintenance

or

special

tools

and

test

equipment

are required

to

service this

display

station.

The

format

for

page

numbering

is

X-YYY.

X is

the

section

number

and YYY is

the

page

number

within

that

section. For example,

1-22

is page 22 in Section 1.

Three

digit

reference

numbers

are used in the

MAPs

and

text

to

index

the

maintenance

information.

In

the

MAPs

and text, these

numbers

are in parentheses. For

example,

110

refers

to

Description and Parts Location

under

100

Keyboard Unit.

MAPs

SECTION

The

MAPs section

contains

MAP

charts

that

help

you

isolate a

problem

to

a

failing

FRU.

Three-digit

reference

numbers

refer you

to

the

suitable maintenance

information

to

adjust

or

replace it.

Using This

Manual

MAINTENANCE

INFORMATION

SECTION

The Maintenance Information section is indexed by

three-digit

numbers

for

referencing. The

major

divisions

that

are indexed are the keyboard unit (100). display

unit

(200).

lower

unit

(300).

power-on

diagnostics

(520). and

online

tests

(600).

INDEX

The index is a detailed

keyword

reference

to

all the

material contained in

this

manual.

Using

This

Manual

1

-1

I

·---~-----~-·-·~-

------~--·--

----------·---

This

page

is

intentionally

left

blank.

1-2

Using This Manual

MAPs

Section

USING

THE

MAPS

The

MAP

charts are designed

to

identify

a field

replaceable

unit

(FRU)

or

an

adjustment

for

a

symptom.

The

symptoms

are arranged in

the

charts according

to

five

combinations

of

conditions

identified in

the

vertical

columns. They are:

1.

2.

3.

4.

5.

Power-on

diagnostics

complete

to

alarm, screen

not

bla_nk,

and

conditions

not normal

with

power

on.

Power-on

diagnostics

complete

to

alarm, screen

not

blank, and

conditions

normal

with

power

on.

Power-on

diagnostics

complete

to

alarm,

but

the

screen is blank.

Power-on

diagnostics did not complete, and

the

screen is

not

blank.

Power-on

diagnostics

did

not complete, and

the

screen is blank.

Locate

the

correct

combination

of

conditions

in

the

vertical columns. Find

the

correct

symptom

in

the

Symptom

column. The Checks

or

Comments

column

contains

important

information

about

the

symptom

or

repair action.

The Repair

Action

column

identifies

the

FRU

or

adjustment

procedure. The

numbers

in parentheses are

references

to

the

Maintenance Information section

that

describes

the

replacement or adjustment.

I

Cursor

01-02

•

/

NORMAL

CONDITIONS

AFTER

POWER

ON

The

following

figure

shows

the

normal

conditions

of

the

display station after

power

on and

with

the

controller

communicating. For

further

information

concerning the

status line. see reference

520

Power-On Diagnostics.

Note:

When

a key is pressed,

the

character should be

displayed. The location

of

the cursor is

determined

by

the controller.

Status

Indicators

( • =

on;

- - =

off)

System Available.

When

on,

it

indicates

that

the

system

controller is

communicating

with

the

display station.

Message

Waiting.

When

on.

it

indicates

that

a message

is

waiting

for

the

display station operator.

Keyboard Shift.

When

on,

it

indicates

that

the

uppercase (level) characters are active.

Insert

Mode.

When

on,

it

indicates

that

an insert

operation is in effect.

Input

Inhibited.

When

on,

it

indicates

that

the

system

cannot process a keyboard scan code.

A

four-digit

cursor location code is also displayed on

the status line. This

code

gives

the

row

and column

location

of

the

cursor.

When

the

cursor is in

the

upper

leftmost

corner,

the

code displayed is

01-02.

The code

is always displayed, except

when

an error occurs and an

error status line is displayed (520).

/

.I

I. Status Line

Note:

Some

display stations may display a

sign-on

menu.

MAP

Charts

2-1

I

N

I

N

s

)>

-0

(")

':7

Q)

;;;

START

Normal

Conditions

After

Power

On

(2-1):

1.

System

Available on.

2.

Cursor

location

equal

to

01-02.

3.

Normal

status

line (no

error

codes).

4.

Normal

size screen and stable.

5.

All

characters

and/

or

indicators

correctly

displayed. Raster

not

visible.

If

a

sign-on

menu is displayed, select

the

on-line

test

(600)

to

operate in

free

key mode.

Notes:

1. The

ai<1rm

sounds

when

power

on

diagnostics

are

complete.

2.

Clockwise

(forward)

rotation

of

the

control

knob

increases

the

volume.

MAP

Chart

1

Symptom

Checks

or

Comments

Repair

Action

p s c

0 c 0 Rolhng

screen-

Horiz. roll wtll

appear

as 2

unstable

Display

unit

or planar

or

1/0

w R N Horizontal

or

vertical horiz.

bands

where

cursor

and

assembly

(240, 347, 348)

E E D

status

line

should

be.

R E I

Bright

oversize raster and vertical Retrace line

out

of

focus

and

Display

unit

(240)

N T

band

left

center

Brightness

control

inoperative.

0 I

N N 0 Everything

except

status

line

Displays

only

in

the

center

Display

unit

(240)

0 N

displays

as a line

of

horizontal

Status

line

displayed

above

normal

D T s

dashes

position

I

A B N

Status

line

normal.

Cursor

and

Display

normal

on all

other

lines

Display

unit

(2401

G L 0

characters

displayed

as

multiple

N A T horizontal

dashes

in

row

1

0 N Raster

displayed

Cursor

and

status

line

normal

(2-1

).

Display

unit

(240)

s K N Display

station

operates

normally

T 0

I R Fuzzy

(out

of

focus),

narrow,

off

Adjustment/Display

unit

c M center,

or

tilted

1230, 240)

s A

L

Only

a

horizontal

line

is

displayed

Line

may

be

solid

or

broken Display

unit

(240)

c

0 w

Only

a vertical line is

displayed

Line

may

be

solid

or

broken

Display

unit

(240)

Line

may

not

be

straight

M I

p T

Wrong

display

size vertically Characters

display

correctly

Ad1ustment/

Display

unit

L H 1230, 240)

E

T p

No

cursor

Characters

display

from

keyboard

Planar (347)

E 0

OK

w

T E

Status

line

displayed

as

horizontal

Cursor

position

displayed

as

horiz. Display

unit

(240)

0 R lines line

at

bottom

of

screen

Cursor

on

the

right

System

Available on Planar (347)

A 0

L N

Normal

Status

line

not

displayed

Extraneous data

or

missing

dots

on

Planar (347) DISplay (240)

A

correctly

(2-1)

the

screen

or

wrong

characters II 0

assembly

(348)

R

displayed

M

--

- -

--

- - -

-~·

----

- - -

--

-

--

-

Symptom

Checks

or

Comments

Repair

Action

Wrong

display

size (all sides)

+15

Vdc

is

too

low

or

too

high

Power

supply

board

1345)

Unstable

information

Ripple on

the

+15

Vdc

Power

supply

board

(345)

Vertical Jitter All

other

conditions

normal

after

Power

supply

transformer

power

on

(2-1)

1344)

Continuous

diagnostic

loop

Loops

on ERROR

status

line

and

Planar/1/0

a55embly (347,

alarm

sounds

with

CE

switch

set

off

348)

(422)

Keyboard

ID

field

equals

KU

or

LU

If

LU

is

displayed

with

the

keyboard

Keyboard/Planar

(140, 347)

(520)

disconnected,

replace

the

planar

(347).

Check

keyboard

cable.

Stuck

key

field

equals

1 1520)

Keyboard/Planar

(140. 347)

Line

check

counter

is

counting

(520)

System

Available on

or

flashing

and

Power

supply

board

1345)

cursor

on

right

No

System

Available

or

system

Check

the

-5

Vdc

(311.)

Fuse 3

or

power

supply

available flashing.

board

1311)

(345)

(Cursor

on

the

right) /

Check

the

system

network

Planar (347)

Check

the

system

configuration

(2 II0

assembly

(34.8)

stations

may

be

at

the

same

Power

supply

board

(345)

address)

Check

the

system

cable

Missing

dots

on

displayed

Planar (347)

characters

Continuous

or

intermittent

resetting

Attempt

to

sign on.

Work

station

Planar (347)

screen.

Cursor

may

be

at

right, left.

will

begin

to

loop.

Power

supply

board (345)

or

bottom.

-

---·-

---

s

}>

-0

0

:::r

"'

;:i

(/!

rv

I

w

-

c Displayed

address

does

not

match

0

N

the

switches

D

I

T

Missing

attribute

(620)

I

0

N Line

check

counter

is

greater

than

5

s

N

All

keys fail

to

display

from

0

keyboard

R

M Fails

to

blank

data

A

L

Keyboard

problems

w

I Display

mode

function

failure

T

H

Wrong

characters

displayed

for

p keys

pressed

0

Missing

dots

on characters

w

E IPL

sign-on

displayed

in place

of

R USER

ID

sign-on.

0

Cursor

select

or

row

and

column

N failure

Blank Screen

I

Power

off

Set

address

(420),

Press

and

hold

a key

Planar/1/0

assembly

(347,

Power

on

348)

Attribute

fails

and

no

status line Planar (347)

errors (520)

Call

system

operator

to

check

the

Failing

network/Terminator

network

switch

(423)

Keylock (RPQ) is

unlocked

Planar

/Keylock

(347,

346)

Keylock (RPQ)

is

locked

Planar/Keylock

(347,

346)

Row,

column,

or

single key

or

Planar

/Keyboard

(347, 140)

column

failures,

missing

dots,

etc.

Fails

to

reverse

image

Planar (347)

Some

keys fail.

No

status line Planar (347)

errors (520)

Planar (347)

Nond1splay

attribute

failed

(620,A

11

Planar (347)

Keyboard

is

OK

Planar (347)

Check

the

+15

Vdc

at

the

planar

If

missing

replace

power

test

point

(312).

supply

board

(345)

Display (240)

Planar

(34

71

1/0

assembly

(348)

MAP

Chart

2

CHECK

THE

ALARM

If

the

alarm

does

not

sound,

do

the

following:

Power

off.

Remove

the

lower

unit

cover (341

).

Disconnect

the

alarm

wires

from

the planar

connector

(312).

Use a

CE

meter

on the

+6

Vdc

scale.

Measure across

the

connector

pins 1{+) and

3(-).

Power

on.

The

meter

should

deflect

right-left-right.

If

deflection

is correct,

go

to

MIM

354,

otherwise

use

MAP

Chart

2.

Symptom

Checks

or

Comments

Repair

Action

p s

O-e

Keyboard

ID

field

equals LU (520) Check

the

address

switch

settings

Planar/1/0

assembly

(347,

..

-(421)

348)

WR

E

Wide

band

of

horizontal lines in Lines

may

or

may

not

be rolling

Power

supply

board

(345)

R E

center

of

screen Planar (347)

E

0 N

Unstable

horizontal

lines

Not

full

screen

Power

supply

board

(345)

N Planar (347)

D N Failing

+5

Vdc

(311) 1. Fuse 2 is

OK

Power

supply

board

(345)

I 0 Full

raster

vertically

with

bright

Planar (347)

A T horizontal

bands

on

top

and

G

bottom;

not

stable

2.

lf

fuse 2

is

blown,

disconnect

If

fuse

2

does

not

blow

N the

keyboard

(142)

and

replace again, check

the

0 B

fuse

2.

cable/replace

the

s L

keyboard

(140).

If

fuse

2

blows

again,

T A replace

the

power

supply

I N

board/planar

(345, 347)

c

s K

All

of

the

above

OK

Planar (347)

D

I B

D

Check

the

following

in sequence.

L

N A

1.

Fuse 1 is

blown

(310,

331)

Fuse 1

0 N

2.

No

AC

voltage

at

TB1 (310, 331) Check

for

an

open

in line

cord

Line

cord/primary

power

T K

Measure

across

TB

1-1

and

2 assembly 1349)

c 3.

24

Vac

is zero (311)

Open

transformer

Power

supply

transformer

0 s

Measure

Jl-5

to

Jl-6

(344)

M c

p 4. DC

voltage

failure (332)

+5

Vdc

is less than

1.0

Vdc

Planar

/power

supply

L R

+15

Vdc

is less

than

6.0

Vdc

board 1347. 345)

E E 5.

24

Vac

is

low

(311)

T E

Open

capacitor

AC

capacitor

(343)

Measure

Jl-5

to

Jl-6

E N 6.

Power-on

reset failure (312) Planar POR

test

point

does

not

read PlanarI

power

supply

+5

Vdc

(4.6-5.5)

board (347, 345)

7.

All

of

the

above

OK Planar (347)

-••••••••---~

-~-zwwsz7557an

~iti..--li'Cj'jiji\t

·

·-----

------~-~~-·

---·--·-----------

This

page

is

intentionally

left

blank.

7-4

MAP

Charts

-·------------------·

----

USING

THE

MAINTENANCE

INFORMATION

The Maintenance Information section is arranged

into

six

subsections. Each

of

the

subsections and

the

major

divisions

within

them

are identified by

three-digit

reference numbers.

The

first

three subsections are relative

to

the major

hardware units

of

the

display station. These are

the

keyboarCI

unit

(100), display

unit

(200), and

the

lower

unit (300).

Within

each

of

these subsections, the

information

is

arranged

to

aid you

to

locate a specific part

or

area.

Then adjustments,

if

necessary, are supplied. Lastly,

instructions are supplied

for

removing and replacing

the

field replaceable units.

The remaining subsections contain

information

on

the

display station diagnostics (520) and online

tests

operation (600).

100-110

Maintenance

Information

100 KEYBOARD

UNIT

110

Description

and

Parts

Location

The keyboard unit includes the covers, the keyboard

(logic card and key assembly) and the cable. No repair

action

will

be performed on the logic card and key

assembly.

If

it fails

for

any reason, replace it.

The keyboard cable connects

to

the planar (in the

lower

unit)

of

the display station and

to

the logic card in the

keyboard unit.

Keyboard

Unit

3-1

I

IBM 5291 Setup guide

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