Ibm 5251 11 Setup guide

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SY31

-0461 -0

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IBM 5250 Information Display System

IBM 5251 Display Station

Model

11

Maintenance Information Manual

---SY31-0461-0

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IBM 5250 I

nformation

Display System

IBM 5251 Display Station

Model

11

Maintenance

Information

Manual

This maintenance information manual is

to

be

used

for

servicing the IBM

5251

Model

11

Display Station.

Customer engineers using this manual are assumed

to

have completed the

5251

Model

11

Display Station

education course.

The Maintenance Information Manual (MIM) is in

two

major sections; maintenance and theory. Maintenance

includes locations, procedures, and diagnostic aids.

Theory includes data flow, functional units, and features.

Definitions

of

terms and abbreviations that are

not

common, but

are

used in the

MIM

are

in

Glossary

of

Terms and Abbreviations.

Setup instructions

for

the

5251

Model

11

Display

Station are

in

Appendix

A.

Note: MIM

pages

vi, 1-4, 1-6, 1-10, 1-18, 1-42,1-43,

1-45,1-46,1-53,1-55, 3-2 and

A-1

have

DANGER

and

CAUTION notices.

If

desired, translate

these

notices and write your own words on the blank

lines provided on

these

pages.

First

Edition

(December

1977)

Preface

Related information can

be

found

in

the following

manuals:

• IIBM 5250 Information Display System Installation

Manual -Physical Planning, GA21 -9277

• IBM 5250 Display System Reference Card,

GX21-9249

• IBM 5251 Display Station Operator's Guide,

GA21-9248

IBM 5251 Display Station Setup Procedures,

GA21-9286

IBM 5251 Model

11

Display Station Maintenance

Analysis Procedures, SY31-0571

• IBM 5256 Printer Operator's Guide, GA21-9260

• IBM 5256

Printer

Maintenance Information Manual,

SY31-0462

• IBM 5256

Printer

Maintenance Analysis Procedures,

SY31-0572

The information in this manual is sometimes changed.

Any

changes will be given

in later editions. Requests

for

copies

of

IBM

publications should be made

to

your

IBM

representative

or

the

IBM

branch

office

serving

your

locality.

A Reader's Comment Form is

at

the

back

of

this

publication.

If

the

form

has

been removed, address

your

comments

to

IBM

Corporation, Publications,

Department 245, Rochester, Minnesota 55901. Comments become the property

of

IBM.

The 5251 Model

11

has

the

following specific DANGERs:

• Line voltage

is

present

at

the

power supply

and

the

dis-

play assembly.

• High voltage

is

present

at

the

cathode-ray tube.

• The cathode-ray

tube

could

implode if it

is

hit

or

dropped.

• The green wire in

the

display assembly

is

not

at

ground

voltage.

vi

Safety

CE

SAFETY

PRACTICES

All

Customer

Engineers are

expected

to

take

every

safety

precaution

possible

and

observe

the

following

safety

prac·

tices

while

maintaining

I

BM

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

dc,

when

removing

or

assem·

bling

major

components,

working

in

immediate

areas

of

power

supplies,

performing

mechanical

inspection

of

pow-

er

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

possible.

4.

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

rings,

wrist

watches,

chains,

bracelets,

or

metal

cuff

links.

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.1. Use

suitable

rubber

mats,

pur-

chased

locally

if

necessary.

5. Wear

safety

glasses

when:

a.

Using

a

hammer

to

drive

pins,

riveting,

staking,

etc.

b.

Power

or

hand

drilling,

reaming,

grinding,

etc.

c.

Using

spnng

hooks,

attaching

springs.

d.

Soldering,

wire

cutting,

removing

steel

bands.

e.

Cleaning

parts

with

solvents,

sprays, cleaners,

chemi-

cals,

etc.

f.

Performing

any

other

work

that

may

be

hazardous

to

your

eyes.

REMEMBER

-

THEY

ARE

YOUR

EYES.

6.

Follow

special

safety

instructions

when

performing

special-

ized

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.

7.

Do

not

use solvents,

chemicals,

greases,

or

oils

that

have

not

been

approved

by

IBM.

8.

Avoid

using

tools

or

test

equipment

that

have

not

been ap-

proved

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

equip-

ment

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.

15.

Always

place

CE

tool

kit

away

from

walk

areas

where

no

one

can

tnp

over

it;

for

example,

under

desk

or

table.

16.

Avoid

touchmg

moving

mechanical

parts

when

lubricatm!l,

checking

for

play,

etc.

17.

When using

stroboscope,

do

not

touch

ANYTHING

-

It

may

be

movmg.

18.

Avoid

wearing

loose

clothmg

that

may

be

caught

in

mao

chinery.

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 mches

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

per·

forming

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

him-

self

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

ald.

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.

lift

jaw

up

to

keep

tongue

out

of

air

passage.

5.

Pinch

nostrils

to

prevent

air

leakage

when

you

blow.

6.

Blow

until

you

see

chest rise.

7.

Remove

your

lips

and

allow

lungs

to

empty.

8.

Listen

for

snoring

and

gurglings

-signs

of

throat

obstruc-

tion.

9.

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

CE

Safety Practices

5251

MIM vii

GLOSSARY

OF

TERMS

AND

ABBREVIATIONS

LEGEND

..•........•.......

USING

THE

IBM

5251

MODEL

11

DISPLAY

STATION

MAINTENANCE

INFORMATION

MANUAL

Maintenance Procedures

Diagnostic

Aids

. .

Mini

MAPs

....

Preventive Maintenance

Tools and Test Equipment

Theory

...

Features

..

Appendixes

Index

...

MAINTENANCE

PROCEDURES

LOCATIONS

...

100

Front

View

.

101 Covers Open

102

Cable Chart .

103

Main Planar Board and Card Locations

104

Main Planar Board Part Numbers

105

Main Planar Board

Jumpers

COVERS

~

.......

.

108

Display Station Covers . . .

109

Keyboard Covers

...

. .

CONTROL PANEL

AND

KEYLOCK

110

Control Panel . . . . . . .

111 Brightness and Contrast Controls

Mini

MAP

Conditions

After

Power On

Service

Aids

. . . . . . . . . .

Tools

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

.

112

Control Panel LEOs

Mini

MAP

Conditions

after

Power On

Service

Aids

. . . . . . . . • .

Tools

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

.

113 Control and Access Panel Switches

Mini

MAP

Conditions

After

Power On

Service

Aids

. . . . .

Tools

.......

.

114

Keylock

Mini

MAP.

xiii

xix

.

xx

1-1

1-2

1-3

1-4

1-5

1-6

1-7

1-8

l;-8

1-10

1-12

1-14

KEYBOARD

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

.

130 Keyboard Locations . . . . . . .

131 Keyboard Removal and Disassembly

132 Cleaning . .

133 Key

Module.

Removal

Installation

134 Spacebar

Removal

Installation

135 Flyplate Replacement

136 Keyboard 10

Mini

MAP

Conditions

After

Power On

Service

Aids

. . . . . . .

Tools

.........

.

137 Keyboard Scan Code

Mini

MAP

Conditions

After

Power On

Service

Aids

..........

.

Tools

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

.

138 Keyboard Voltage and Strobe

Mini

MAP

Conditions

After

Power On

Service

Aids

. . . . . . . . .

Tools

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

.

139 Keyboard Clicker

Mini

MAP

.

Conditions

After

Power On

Service

Aids

. . . . . . . . .

Tools

...........

.

140 Keyboard Cable Check

Mini

MAP

Conditions

After

Power On

Service

Aids

. . . . . . . .

Tools

..........

.

141 Keyboard

POR

Mini

MAP.

Conditions

After

Power On

Service

Aids

. . . . . . .

Tools

.........

.

142 Keyboard

Identification.

143 Keyboard Arrangement .

Keyboard Template

....

Standard Keyboard Layout

Standard Keyboard Layout (Katakana)

144

Scan Code Tables . . . .

Standard Keyboard . . . . .

Standard Keyboard (Katakana)

DISPLAY

........

"

..

.

150

B-Type Display Assembly Locations

150 E-Type Display Assembly Locations

150

M-

Type Display Assembly Locations

150

V-Type Display Assembly Locations

viii

Contents

151 Display Assembly Removal and Replacement

1-17

1-18

1-20

1-22

1-24

1-26

1-28

1-30

1-32

1-34

1-35

1-36

1-37

1-38

1-39

1-40

1-41

1-42

DISPLAY

ADJUSTMENTS

. . .

152 Video Adjustments

Brightness Limiter

Adjustment

Contrast Control and Brightness Control Adjustments

Video Gain

...........

.

153 Vertical and Horizontal Adjustments

Vertical Adjustments .

Horizontal Adjustments .

154 Yoke Adjustment . .

155 Centering Adjustment

156 Raster . . . . . . .

Raster Check

.....

157 Display Signal/Planar Power Cable

Mini

MAP.

Conditions

After

Power On

Service

Aids

. . . . . . .

Tools

.........

.

158 Display Screen Examples

CUSTOMER

TWINAXIAL

CABLE

170 Cable Signal Quality Check

171

Twinaxial Cable and Terminator

Switch

172 Typical Display Station Configuration

173 Station Protector

POWER SUPPLY

...........

.

180 Power Supply Locations . . . . . .

181

Power Supply Removal and Replacement

182 Voltage Level Checks

.....

183 Power Supply Ripple Level Check

184 Power Supply Charts

115

Volt

Power Supply (US) . . . .

World

Trade Power Supply . . . .

185 Line

Cord/Line

Filter Removal and Replacement

DIAGNOSTIC

AIDS

. . .

200 Control Panel LEDs

201

Status Switch . . .

202 Field

Attribute

Characters .

203 Display Station Operation Overview

204

Power

On

Diagnostic

205 Free Key Operation

206 Online Tests

Online Tests Overview

Online Tests Displays .

207 Sign-On Procedure

208 Error History Table

209 Error

Codes.

. . .

Display Station Error Codes

Operator Error Codes . . .

210 Diagnostic Display Locations

212 Troubleshooting

Aids

PREVENTIVE

MAINTENANCE.

TOOLS

AND

TEST

EQUIPMENT

CE

General Logic Probe

THEORY

.....

.

INTRODUCTION

System Configuration

DATA

FLOW

....

1-43

1-44

1-45

1-46

1-48

1-51

1-52

1-53

1-54

1-55

1-56

1-57

1-58

1-59

1-60

1-62

1-63

1-64

1-67

1-68

1-69

1-70

1..:80

1-81

1-82

1-83

1-85

1-86

2-1

3-1

3-2

4-1

4-3

FUNCTIONAL UNITS . . . . . . . .

Keyboard and Keylock Adapter Control

Keyboard

.....

.

Clicker

......

.

Keyboard Identification

Display

Adapter.

. . . .

Buffering and Displaying

Control Panel . . .

Display Screen . . . . . .

Field Attributes

Display Screen Indicators

Cable Adapter . . . . . .

The

16-Bit

Frame

Transmission Sequences

Commands

Response Frame

Interface

Data Transfer .

Microprocessing

Unit

(MPU)

Read/Write

Storage

Internal Processing

Queue.

Control Registers

FEATURES.

Keylock .

Cable Thru .

4-4

4-5

4-6

4-7

4-8

4-9

4-10

4-11

4-12

4-13

4-14

4-15

4-16

5-1

5-2

APPENDIX

A.

DISPLAY

STATION

SETUP

INSTRUCTIONS

SETUP INSTRUCTIONS-SECTION 1 A-1

SETUP INSTRUCTIONS-SECTION 2

A-2

APPENDIX

B.

KEYBOARD

FUNCTIONS

System

Request/Attention

Key.

Command Key . . . .

Delete/Insert

Key

Erase

Input/Home

Key

Print Key

Help Key

.....

.

Roll Keys

.....

.

Horizontal

Movement

Keys

Error Reset Key . . . . .

Enter/Record Advance Key

Field Exit Key

Field

+.

Key

Field -Key

Dup Key

Character Backspace Key

Field Advance Key .

Field Backspace Key

New

Line Key

Shift

Key

..

Shift

Lock Key

Spacebar

INDEX

...

B-1

B-2

8-2

B-2

B-3

8-3

B-3

X-1

Contents 5251

MIM

ix

)

This page

is

intentionally

left

blank.

xi

xii

This page is

intentionally

left

blank.

pf:

microfarad.

AC:

Alternating current.

addr:

Address

ALU:

Arithmetic

and logic unit.

ASCII:

American National Standard Code

for

Information Interchange.

attribute:

Controls

how

data

is

displayed on

the

display

screen. For example, attributes

of

a display field include

blinking, high intensity, and reverse image.

B-type

display

assembly:

Refer

to

reference 150.

blink:

An

attribute

of

a display field

that

causes the

characters

to

flash.

brightness

limiter:

Refer

to

reference 150.

Cable

Thru

feature:

A special feature

that

permits

multiple display stations

or

printers

to

be attached

to

a

system cable.

char:

Character.

character

matrix:

A part

of

the display screen

.character

window.

The character matrix is 16 scans by

8 dots wide.

character

window:

A part

of

the display screen

24

scans

by

10

dots

wide

including

the

character matrix.

clicker:

A solenoid in the keyboard

that

makes a sound

after each keyboard character is received by the display

station.

Cmd:

The command key on the keyboard

that

is used

to

select command functions.

column

separator:

A vertical bar in a field

of

data

that

separates all characters in

that

field.

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.

cont:

Controller

Glossary

of

Tenns

and

Abbreviations

contrast

control:

Refer

to

reference 100.

controller:

A device

that

controls the operation

of

one

or

more

input

or

output

devices.

data

stream:

A continuing

flow

of

data.

dc:

Direct current.

diag:

Diagnostic.

driver:

Refer

to

reference 212.

Oup:

The key on the keyboard that is used

to

duplicate

a field

from

a preceding field.

E-type

display

assembly:

Refer

to

reference 150.

end-of-message

delimiter:

A 111 in

the

station ID

that

indicates the last frame

of

a message block.

ERAP: Error recording analysis procedures

field

attribute:

The control characters

that

describe a

displayed field. For example, a display field can be

intensified, reversed, underscored, or made

to

blink.

flyplate:

Refer

to

reference 135.

FRU: Field-replaceable unit.

hex:

Hexadecimal.

HH:MM:SS:

Hours, minutes, and seconds.

I/O:

Input/Output.

10: Identification.

implode:

To

burst inward.

Ins:

The key on the keyboard

that

is used

to

select

insert mode.

IPL:

Initial program load.

KBO:

Keyboard.

key

stem:

Refer

to

reference 135.

Glossary

of

Terms and Abbreviations 5251

MIM

xiii

keylock:

A device

with

a lock and key

to

restrict use

of

the display station.

keystroke:

The action

of

pressing a key on the

keyboard.

LED: Light-emitting diode.

linearity:

The size

of

displayed characters being in

proportion.

LRC: Longitudinal redundancy check.

M-type

display

assembly:

Refer

to

reference 150.

main

planar:

The basic printed circuit electronic board

used in the display station.

make/break

key:

A key

that

generates a scan code

when the key is pressed and when

it

is released.

MAP:

Maintenance analysis procedure.

menu:

A list

of

options

that

can be selected

to

request

display station tests.

microprocessing:

An

operation

of

the MPU.

microprocessing

unit

(MPU):

A processing unit

that

is

microprogram controlled and performs internal machine

operations. The MPU receives data, controls

the

display

of

data, and controls the

flow

of

information

to

and

from

the controller.

microprogram:

A program

that

uses microinstructions

to

carry

out

system operations.

MIM:

Maintenance information manual.

mini-MAP:

A maintenance analysis procedure

that

is

located in the maintenance information manual.

A"

mini-MAP

continues the failure analysis after one

of

the

other

MAPs

has located the area

that

is failing.

MPU:

Microprocessing unit.

mm:

Millimeter.

ms:

Millisecond.

msg:

Message.

MSIPL:

Main storage initial program load.

multiframe

response:

More

than one frame

or

multiple

frames

of

data

that

are sent.

xiv

N/C:

Pertains

to

a switch setting; normally closed.

N/O:

Pertains

to

a switch setting; normally open.

null:

A character

of

all zeros

that

occupies a position in

the

buffer

and is displayed

as

a blank.

Online tests: A series

of

online tests

that

can be

requested

from

the

controller after

power

on and before

sign-on.

They are requested and displayed by primary

and secondary menus. Refer

to

206.

option:

The selection listed on a display screen menu

for

test

requests.

P-P:

Peak-to-peak.

pc:

Printed circuit.

planar:

See main planar.

PM:

Preventive maintenance.

poll:

A technique the controller uses

to

determine

if

a

display station is ready

to

send

or

receive data.

POR: Power on reset.

POT: Power on transition.

R/D:

Receiver/driver.

raster:

A condition

of

the display screen in which the

display screen is lighted

but

contains no data. Refer

to

reference 156.

read-only

storage

(ROS): A device in

the

MPU that

reads data and does not change the data.

read/write

storage:

A device in the MPU

that

stores

information

for

later use and can be changed

by

an

MPU.

refresh:

Pertains

to

the repeated actions

of

the display

adapter

when

data is displayed.

regen:

An

area in

read/write

storage where data is

stored before

it

is displayed.

register:

A storage device

or

circuit

that

stores those

limited parts

of

data needed

for

executing

input/output,

storage, processing, and control operations.

resolution:

The visual quality

of

display screen data.

retaining

ears:

Refer

to

reference 133.

retrace

lines:

Refer

to

reference 156.

retry:

Sending frames

of

information a number

of

times

by the controller until received

by

the display station

without

an

error.

ripple

level:

A voltage measurement.

rolling:

Pertains

to

movement

of

a display screen;

either horizontally, vertically,

or

a combination

of

both.

ROS:

Read

only storage.

rt

adj:

Right adjust.

serdes:

Serializer/ deserializer.

serializer/deserializer

(serdes): A register that is used

to

send data

from

the display station

to

the controller,

one

bit

at a time.

setup:

Preparing a device

for

operation.

sign-on:

The procedure performed at a display station

that

can include entering the

sign-on

command, a

password,

or

other user specified security information.

stabilizer:

Refer

to

reference 134.

stat

addr:

Station address.

stem:

See key stem.

synchronization:

Two

or

more events occurring

at

the

same time.

SVCS:

Services.

Sys

Req: The Sys

Req

key is used

to

enter a request

directly

to

the system.

TB:

Terminal block.

template:

Refer

to

reference 143.

Terminator

switch:

A switch used

to

terminate the

twinaxial cable at the last

display

station

or

printer in a

series. This switch is a part

of

the Cable Thru feature

on a display station.

theory:

A section

of

this manual

that

includes data

flow,

functional units,.and features.

twinaxial

cable:

A

twisted-pair

shielded cable

that

connects a display station

or

printer

to

a controller.

typamatic

key:

A repeat-action key on the keyboard.

underscore:

An

attribute

of

a display field

that

places a

line under all positions

of

the field.

US:

United States.

V-type

display

assembly:

Refer

to

reference 150.

Vac:

Volts alternating current.

Vdc:

Volts direct current.

video:

Pertains

to

the display screen image.

yoke:

Refer

to

reference 150.

YY

/MM/DD:

Year, month, and day.

Glossary

of

Terms and Abbreviations 5251

MIM

xv

,

___________________________________________________________________

1

XVI

This page

is

intentionally

left

blank.

Legend

Display Screen Note Block

0 Information

Control Panel Block

0 Lights

0 On·Page

Connector

( ) Start and End

of Flowchart

Logic (indicates

CJ

Off·Page signal direction)

Connector Driver

Anode Cathode

Legend

5251

MIM

xvii

xviii

This page

is

intentionally

left

blank.

Using

the

IBM

5251

Model

11

Display

Station

Maintenance

Infor'mation

Manual

The information

il"!

this MIM is

to

be used as reference

material when diagnosing machine failures. This

MIM

contains maintenance procedures, diagnostic aids,

preventive maintenance information, tools and

test

equipment information, theory and features. Appendixes

give general information

that

is not directly related

with

the maintenance

of

the 5251 Model

11

Display Station

(information such

as

setup procedures).

The

format

for

page numbering is

XXX-YYV.Z.

Where

XXX

is the section number, YVY is the page number,

and Z (although

not

normally used) is

for

expansion

when

it

is

not

practical

to

give new numbers

to

a"

pages.

Three-digit

reference numbers are assigned

to

location

drawings and maintenance procedures

to

reference

from

the MAPs. For example, 130 indicates the keyboard

locations

of

the display station.

MAINTENANCE

PROCEDURES

This section contains location drawings, maintenance

procedures,

mini-MAPs,

and diagnostic aids

for

repairing, installing, or diagnosing the failing

field-replaceable units.

Location drawings

show

the position

of

the parts in

the

display station.

Maintenance procedu:-es contain removals,

replacements, and adjustment procedures.

A"

procedures and drawings have the

three-digit

reference

number assigned

to

reference from the MAPs.

Diagnostic

Aids

Diagnostic program descriptions,

how

to

use them, and

what

is available when they are in control are found in

this section. To aid in diagnosing machine failures in

more detail, a list

of

error conditions is included.

Mini-MAPs

You are sent

to

mini-MAPs

after one

of

the other

MAPs

has located the area

that

is failing. The

mini-MAPs

continue the failure analysis

to

locate a failing

field-replaceable unit.

In general,

mini-MAPs

provide you

with

three levels

of

information. These levels are:

1.

2.

A figure showing the circuit line names and pin

numbers.

A description

of

the circuit and

how

it

can be

tested.

3. A detailed guide that uses the yes and no path

of

questions

that

you can

follow

to

isolate the failure.

You can select the level

of

information you need and

ignore the remainder in order

to

locate a failing

field-replaceable unit.

PREVENTIVE

MAINTENANCE

Any

preventive maintenance required by the display

station is described in this section.

TOOLS

AND

TEST

EQUIPMENT

The tools needed

to

service the display station are

described in this section.

Using the

MIM

5251

MIM

xix

THEORY

This section contains descriptions

of

the functional units

and features. These descriptions are preceded by a

view

of

the system that gives you a general idea

of

the

complete operation and where each function or feature

fits·in.

FEATURES

The features that are available with the 5251 Model

11

Display Station are described in this section.

APPENDIXES

Appendix A contains the setup procedures required

to

make a new display station operational. Appendix B

explains the purpose

of

special keys on the keyboard.

INDEX

The index is a detailed list

of

all material in the

MIM.

xx

locations

100

FRONT

VIEW

Display Screen

--

System

Cable----I-------r-'"

Connector

(socket

1)

Address Switches

100

Maintenance Procedures

Bezel Display Screen Indicators

Power

Switch

Access Panel Cover

Connector

(socket 2)

Keyboard Cable

Connector

Maintenance Procedures 5251

MIM

1-1

IBM 5251 11 Setup guide

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