IBM 3278 Guida all'installazione

==i:.= =

~';'§:

Maintenance Library

3278

Display Station

Models

and,

Maintenan.ce Information

SY27-2510-6

Seventh Edition (January 1981)

This

a revision

SY27-2510-5, which

now obsolete.

It incorporates minor technical changes. Changes or additions

the

text

and illustrations are indicated by a vertical line

the

left of the change. Information

this manual

sub-

ject

change from time

time; any such change will be

reported

subsequent revisions or Technical Newsletters.

The drawings and specifications contained herein shall

not

be reproduced

whole

part without written permission.

IBM

has prepared this maintenl!nce manual for

the

use of

IBM

customer engineers

the

installation, maintenance, or

repair

the

specific machines indicated.

IBM

makes no

representations

that

suitable for any

other

purpose.

possible

that

this material may contain reference

to,

information about,

IBM

products (machines and programs),

programming,

services

that

are

not

announced

your

country. Such references

information must not

con-

strued

mean

that

IBM

intends

announce such

IBM

products, programming,

services

your

country.

Requests for copies of

IBM

publications should be made

your

representative

the

branch office ser-

vicing your locality.

A form for readers' comments

provided

the

back

this

publication.

the

form has been removed,

addres~

comments

IBM

Corporation, Department 52Q, Neighborhood Road,

Kingston, N.Y., U.S.A. 12401.

IBM

may use

distribute

any of

the

information you supply

any way it believes

appropriate

without

incurring any obligation whatever. You

may,

course, continue

use

the

information you supply.

©Copyright

International Business Machines Co.rporation

1977,1978,

1979, 1980, 1981

SY27-2510-6

Preface

This publication contains

the

information needed

service and maintain

the

IBM

3278

Display Station

Models 1, 2, 3, 4, and 5. Part numbers for

the

usually needed field replaceable units (FRUsI are

given in Chapter

keyboard assembly FRUs are

given

paragraph 6.7 (Chapter

61.

Additional in-

formation on

the

ordering

parts

contained

the

IBM 3278 Display

Station

Parts Catalog, order

number S126-0020.

Organization

This publication has seven chapters:

• Chapter 1

a brief introduction

the

3278

and

the

maintenance plan for

the

3278.

• Chapter 2 contains

the

maintenance analysis pro-

cedures (MAPs).

• Chapters 3 through 7 contain reference material

that

supports

the

MAPs.

Appendix A, Glossary, defines terms used

this

publication.

Starting Point

The starting point for

all

failure isolation on

the

3278

MAP

00, Start/Restart

MAP.

SY27-2510-5

(1/81)

iii

Contents

Chapter

Introduction

1·1

1.1 General

1-1

11.1.1 Magnetic

Slot

Reader

1-3

1.1.2

Selector

Pen 1-4

1.1.3

APL!Text

1.1.4

Electrical Grounding

1.1.5

Equipment

Lightning

Protection

1.2

Maintenance Plan 1-6

1.3

Operation

Tests 1-6

1.4 FRU

Swapping

1-6

1.5

MAPs 1-6

Chapter

2. MAPs

2-1

MAP 00,

Start/Restart

MAP

2-00-1

Symptom/Repair

List 2·00-3

MAP

01, Terminal Failure

MAP

2·01·1

MAP

02,

Display MAP 2·02·1

MAP

03,

Keyboard

MAP

2-03-1

MAP 04, Feature Error

MAP

2-04-1

1-5

MAP

05,

System

Indicated Failure

MAP

2·06-1

Chapter

3. Maintenance Aids 3-1

3.1

Introduction

3-1

3.2

Switches and Indicators 3-1

3.3

Operation

Tests

3-1

3.3.1 Offline Tests

3-1

3.3.1.1 Test Mode 1 3-2

3.3.1.2

Test Mode 2 3-6

3.3.1.3

Test Mode 3 3-9

3.3.2

Online Tests 3-19

3.3.2.1 Requesting Online Tests 3-20

3.3.2.2

Test 0, Display

Operation

3-22

3.3.2.3

Test

Error

Log

Display 3-26

3.3.2.4

Test

PS Feature Test

Pattern

3-30

3.3.2.5

Error Log/Repair

Action

3-31

Chapter

4. Locations (See Figures) 4-1

Chapter

5. Display Image

Adjustments

5-1

5.1 Yoke Alignment and Centering

5-1

5.1.1 Remove Cone Sh ield 5-1

5.1.2

Yoke Alignment 5-1

5.1.3

Centering and Horizontal Width 5-3

5.1.4

Reinstall Cone Shield 5-3

5.2 Analog Card

Adjustments

5-3

5.3

Focus

Adjustment

5-4

5.4

+44

V Power

Supply

Adjustment

Procedures 5-4

Chapter

6. Removals

and

Replacements

6-1

6.1 Covers

6-1

6.2

Power Units

6-1

6.2.1 Low-Voltage Power

Supply

6-1

6.2.2

Capacitor 6-2

6.2.3

Prime Power Box 6-2

6.2.4

Ferrotransformer

6-2

SY27-2510-6 (1/81 ) v

6.2.5

High-Voltage Power Supply 6-3

6.2.6

Fuses

6-3

6.2.7

Card/Connector Removal and Replacement

Procedures 6-3

6.2.7.1 Internal Connectors 6-4

6.2.7.2

Internal Coax

6-4

6.2.7.3

Cards 6-4

6.2.8

Circuit

Board Segments 6-5

6.3

CRT

6-5

6.4

Yoke

and Shields 6-7

6.5

Operator Controls 6-8

6.5.1

CRT

Frame Assembly 6-9

6.5.2

On/Off

Switch

6-9

6.5.3

Intensity

and Contrast

Controls

6-9

6.5.4

Indicator

Card Assembly 6-9

6.5.5

Switches 6-9

6.6 OPtional Features 6-10

6.6.1

Audible

Alarm

6-10

6.6.2

Security

Keylock

6-10

6.7 Keyboard

Units

6-10

6.7.1 Keyboard

from

Display Station 6-11

6.7.2

Keyboard

Top

Cover 6-11

6.7.3

Keyboard Assembly

from

Base

6-11

6.7.4

Clicker Assembly 6-12

6.7.5

Keybutton

6-12

6.7.6

Key

Module 6-12

6.7.6.1

6.7.6.2

6.7.7

6.7.8

6.8

Key

Module

Removal

(Including

Spacer

Module) 6-12

Key

Module

Replacement 6-13

Spacebar

6-14

Logic

Card Assembly 6-14

Selector

Pen

6-15

Chapter

Magnetic

Slot

Reader

Information

7-1

Appendix

Glossary A-1

vi SY27-2510-6

Figures

1-1

3278 Field Replaceable Units, (D) Type

1-1

1-2 3278 Field Replaceable Units, (M)

Type

1-2

1-3 IBM

3276/3278

Problem

Report

Form 1-8

3-1

Test Patterns 3-3

3-2

Japanese

Katakana Test Patterns 3-4

3-3

Japanese

English Test Patterns 3-5

4-1

Switches and Indicators

4-1

4-2 Switches and Indicators (Katakana) 4-2

4-3 Lower Frame 4-3

4-4 Upper Frame 4-4

4-5

CRT

and

CRT

Frame Assembly 4-5

4-6

Card

Locations, (D)

Type

4-6

4-7 Card Illustrations 4-8

4-8

Card

Locations, (M)

Type

4-9

Card

Illustrations, (M)

Type

4-11

4-10 Keyboard 4-12

4-11

Fuse

Locations-Low-Voltage

Power Supply 4-13

4-12 Prime Power and

Voltage

Distribution

4-14

4-13 Operator Controls 4-15

4-14 Operator Controls and Indicators 4-16

4-15 Feature Cabling 4-17

4-16 Logic Gate

Keyboard Cables 4-18

4-17

Power

Distribution

4-19

5-1

CRT

and High-Voltage Power Supply 5-2

5-2 Yoke Adjustments 5-2

5-3

Yoke

Grounding Clips 5-2

SY27-2510-6 11/81)

vii

Safety Notices

IDANGER,

IDANGER:

I DANGER:

IDANGER,

All power unit removal and

replacement procedures must be

performed with power turned off and

with

the

power cord disconnected.

All

persons handling a CRT

who

are near an exposed CRT under

vacuum must wear safety glasses and

long-sleeved garments.

High

voltage can be present when

Indicator 2

off.

Safety glasses must be worn when you

are working on

the

machine with

power on

off.

Voltages are present

the

heat sinks

the

analog card when

the

power

on. Also, be careful when removing

this card because

the

heat sinks will

hot

(at high temperatures).

I DANGER: Ferrocapacitor

01D/Cl

grounded

only when

the

capacitor

retained by

its mounting spring.

The machine frame

grounded only

when

the

prime power assembly

010/

mounted and fastened

place.

The ferrotransformer assembly 01D/T1

grounded only when it

mounted

and fastened

place.

Caution: The CRT weighs

about

7.25

(16 pounds).

Protect and support

the

CRT when removing and

replacing it

prevent damage

the

CRT and

other

units.

Caution: The 3278 must be off before cards and

cables are reseated

swapped.

careful

not

loosen cards or cables when working on

the

3278.

This could cause intermittent failures then

later time.

Caution: The indicator above

the

ON/OFF switch

not

a primary Power On indicator. Machine voltage

may

present when this indicator

off.

Caution: Do not connect or disconnect

the

device

cables during an electrical storm.

viii SY27·2510-6

SAFETY

PRACTICES

All

Customer

Engineers are

expected

take every

safety

precaution

possible

and

observe

the

following

safety

practices

while

maintaining

IBM

equipment:

-1.

You

should

not

work

alone

under

hazardous

conditions

around

equipment

with

dangerous voltage.

Always

advise

your

manager

you

MUST

work

alone.

Remove

all

power

and

when

removing

assembling

major

components,

working

immediate

area

power

supplies,

performing

mechanical

inspection

power

supplies

and

installing

changes

machine

circuitry.

Pull

the

power

plug

from

the

receptacle

remove

power

source.

3. Wall

box

power

switch,

when

used

disconnect

power,

should

locked

tagged in

off

position.

"Do

not

Operate"

tags,

form

229-1266,

should

be securely

attached

power

switch

outside

power

box.

When

absolutely

necessary

work

equipment

having

exposed

operating

mechanical

parts

exposed

live

electrical

circuitry

anywhere

the

machine,

the

following

precautions

must

followed:

least one

other

person

familiar

with

power

off

controls,

emergency

power

off

procedures,

and the

location

the

wall

box

power

switch,

must

be in

the

immediate

vicinity

all

times.

b. Rings,

wrist

watches, chains, bracelets,

metal

cuff

links,

shall

not

worn.

Only

insulated

pliers

and screwdrivers shall be used.

d. Keep one

hand

pocket.

When using test

instruments

certain

they

are

proper

capacity

and

controls

are set

correctly.

Only

insulated

probes

are used.

Avoid

contacting

ground

potential

(metal

floor

strips,

machine

frames, etc. -

use

suitable

rubber

mats

purchased

locally

necessary).

Safety

Glasses

must

worn

when:

Using a

hammer

drive

pins,

riveting,

staking,

etc.

Power

hand

drill

ing, reaming,

grinding,

etc.

Using

spring

hooks,

attaching

springs.

Soldering,

wire

cutting,

removing

steel bands.

Parts

cleaning,

using solvents, sprays, cleaners,

chemicals,

etc.

All

other

conditions

that

may

be hazardous

your

eyes.

REMEMBER,

THEY

ARE

YOUR

EYES.

6. Special

safety

instructions

such

handling

Cathode

Ray

Tubes

and

extreme

high

voltages,

must

followed

outlined

CEM's

and

Safety

Section

the

Maintenance

Manuals.

r.ot

use solvents, chemicals, greases

oils

that

have

not

been

approved

IBM.

Avoid

using

tools

test

equipment

that

have

not

been

approved

IBM.

9. Replace

worn

broken

tools

and test

equipment.

10.

The

maximum

load

lifted

that

which

the

opinion

you

and

management

does

not

jeopardize

your

own

health

well-being

that

other

employees.

SY27-2510-6 (1/81 )

11. All safety devices such as guards, shields, signs,

ground

wires, etc., shall be restored

after

maintenance.

12. Each

Customer

Engineer

responsible

certain

that

action

on his

part

renders

product

unsafe

exposes

hazards

customer

personnel.

13. Place removed

machine

covers

a safe

out·of-the-way

place

where

one

can

trip

over

them.

14. All

machine

covers

must

place

before

machine

returned

customer.

15. Always place

tool kit away from wal k areas where

one

can

trip

over it !i.e.,

under

desk

table).

16. Avoid

to~ching

mechanical moving

parts

(i.e., when

lubricating, checking for play, etc.).

17. When using

stroboscope

not

touch

ANYTHING -

may

be moving.

18. Avoid wearing loose

clothing

that

may

caught

machinery.

Shirt

sleeves

must

be left

buttoned

rolled above

the

elbow.

19. Ties

must

tucked

shirt

have a tie clasp

(preferably

nonconductive)

approximately

3 inches

from

end.

Tie

chains

are

not

recommended.

20. Before powering

or starting

equipment,

make

certain

other

CEs

and

customer

personnel are

not

hazardous

position.

21. Maintain good

housekeeping

area

machines while

performing

and

after

completing

maintenance.

22. Even

though

preventive measures are

taken,

accidents

occur. CEs

and

support

personnel

should

prepared

emergency

first

aid

procedures

outlined

below.

First

Aid

-General

1. If accidental

electrocution

occurs:

Remove

power

source

before

touching

victim.

b. If

power

cannot

be removed, pull victim away from

equipment

by using

non-conductive

material such

as a

broom

handle,

leather

belt,

necktie.

Immediately

begin rescue breathing; see below.

d. Begin CPR if necessary

and

only

trained

person

available.

e. Call a

doctor.

Have

someone

summon

medical aid.

Remain

position.

After

victim revives, be ready

resume respiration

if necessary.

For

serious injury:

Summon

medical aid.

b. Do

not

move victim unless

absolutely

necessary

remove from danger.

Attempt

stop

serious bleeding by using pressure

points

a pressure bandage.

d. Loosen

clothing

and

keep victim

warm.

Artificial

Respiration

General

Considerations

Start

Immediately,

Seconds

Count

not

wait

look

for help

stop

loosen

clothing,

warm

the

victim

apply

stimulants.

SY27-2510-6

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