IBM 5280 Guida all'installazione

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IBM

5280

Distributed

Data

System

Diskette Drive

Maintenance Information Manual

First Edition (March 1980)

Changes are

periodically

made

the

information

herein;

these changes

will

reported

technical

newsletters

new

editions

this

publication.

possible

that

this

material

might

contain

reference

to,

information

about

IBM

products

(machines and

programs),

programming;

services

that

are

not

announced

your

country.

Such references

information

must

not

construed

mean

that

IBM

intends

announce

such I

products,

programming,

services in

your

country.

Use

this

publication

only

for

the

purpose

stated in

the

Preface.

This

publication

could

contain

technical

inaccuracies

typographical

errors. Use

the

Reader's

Comment

Form

the

back

this

publication

make

comments

about

this

publication.

the

form

has been removed, address

your

comments

Corporation,

Product

Information

Development,

Department

997,

11400

Burnet

Road,

Austin,

Texas

78758.

may

use and

distribute

any

the

information

you

supply

any

way

believes

appropriate

without

incurring

any

obligation

whatever.

You

may,

course,

continue

use

the

information

you

supply.

©Copyright

International

Business Machines

Corporation

1980

This maintenance

information

manual

(MIM)

used

service the diskette drive after

has

been

removed

from

the particular

unit

the 5280 system in which

housed.

Customer engineers using this manual

are

assumed

have

completed the 5280 education course.

This

MIM

has

three major sections: Maintenance, Tools

and Test Equipment, and Theory. Maintenance includes

locations, procedures, and diagnostic aids. Tools and Test

Equipment includes a list

special tools

and

test

equipment and the part numbers

the tools and test

equipment. Theory includes data

flow,

functional units,

and features.

Definitions

terms

and

abbreviations

that

are

not

common,

but

are

used

in the MIM,

are

in the Glossary

Terms andAbbreviations.

There

are

several

DANGER

and

CAUTION

notices in this

manual. You

can

use

the blank lines below

each

notice

translate

into

your

own

words. The locations

these

notices

are

listed in the Safety section.

Related Publications

information

can

found in the following

manuals:

•

IBM

5280

General

Information

Manual, GA21-9350

•

IBM

5280 Operator's Guide, GA21-9364

Preface

•

IBM

5280

User's Setup Procedures, GA21-9365

•

IBM

5280 Data Areas

and

Diagnostic

Aids

Handbook,

SY31-0595

•

IBM

5281 Data Station Maintenance

Information

Manual, SY31-0596

•

IBM

5282 Dual Data Station Maintenance

Information

Manual, SY31-0597

•

IBM

5286 DualProgrammable Data Station

Maintenance

Information

Manual, SY31-0599

•

IBM

5285Programmable Data Station Maintenance

Information Manual, SY31-0600

•

IBM

5288 Programmable

Control

Unit

Maintenance

Information Manual, SY31-0601

•

The

IBM

Diskette General

Information

Manual,

GA21-9182

Preface

iii

Preface

HOW

USE

THIS

MANUAL

vii

MAINTENANCE

PHILOSOPHY.

SAFETY

.....

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

MAINTENANCE.

LOCATIONS

...

330

Diskette

Drive

331

Diskette

Drive

Control

Card

333

Diskette

Drive

Control

Card

Connector

Pins.

COLLET

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

335

Collet/Flat

Spring Removal and

Replacement.

Removal

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

Replacement. . . . . . . . . . .

HEAD/CARRIAGE

ASSEMBLY.

337

Head/Carriage Service

Check.

339

Head/Carriage

Adjustment

340

Pressure Pad Removal and Replacement

(31

only).

Removal

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

Replacement. . . . . . . . . . . . . . . . . .

341 Head/Carriage Removal and Replacement

Removal

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

Replacement. . . . . . . . .

....

HEAD

LOAD

SOLENOID

AND

BAIL.

343

Solenoid

and Bail Service

Check.

344

Head Gap Service Check

...

345

Head Gap

Adjustment

.....

346

Solenoid

and Bail

Adjustment.

347

Bail Removal and Replacement

Removal

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

Replacement. . . . . . . . . . . .

349

Solenoid

and

Idler

Removal and

Replacement.

Removal

...

Replacement. . . . . . . . . . . . . . . . .

DRIVE

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

351

Drive

Motor

Removal and Replacement

Drive

Motor

with

External

Fan.

Removal

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

Replacement

..........

Drive

Motor

with

Internal

Fan

Removal

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

Replacement. . . . . . . . . . .

353

Capacitor

Removal and

Replacement.

Removal

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

Replacement. . . . . . . . . . . . . . . .

355

Drive

Fan and Pulley Removal and Replacement

Removal

.....

Replacement. . . . . . . . . . . . . . . . .

STEPPER DR

IVER.

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

357

Stepper

Motor

Removal and

Replacement.

Removal

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

Replacement. . . . . . . . . . . . . . . . . . .

359

Stepper

Motor

Pulley and Clamp Removal and

Replacement

Removal

...

Replacement.

· 1

.12

.14

.15

· 18

.20

.22

.24

.26

.28

.32

.34

.36

.38

361

Drive

Band Service Check

........

363

Drive Band

Adjustment

.........

365

Drive Band Removal and Replacement .

Removal

..........

Replacement

........

LED

AND

PTX

ASSEMBLIES.

367

Diskette

Speed Service Check .

369

LED

Output

Service Check

...

371

LED

Removal and

Replacement.

Removal

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

Replacement. .

..........

373

PTX

Amplifier

Service Check

375

PTX

Removal and Replacement .

Removal

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

Replacement. . . . . . . . . . . . .

377

Diskette

Drive

Control

Card Removal and

Replacement

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

Removal

Replacement. . . . . . . . . . .

TOOLS

AND

TEST

EQUIPMENT

THEORY

.....

Introduction.

. . . .

Diskette

Description

Stepper

Motor.

. . .

Operation

....

Format

Principles

Read Data

....

Scope Charts

...

MFM

Format

Principles

Read Data

Scope Charts.

Volume

Label

Volume

Label

Layout

Volume

Label

Format

Header Label . . . . . . .

Header Label

Layout

Header Label

Format

Data Recording

Format

Gap 1

....

Sync

Field

CRC .

Gap 2

AM2

Data

Field.

Control

Field

Gap

Index.

Operation

Typical

Timing

Sequence

Contents

.........

.39

.40

.42

.44

.49

.52

.54

.56

.57

.59

.60

.62

.63

.64

.65

.66

.67

.70

.74

.75

.76

.77

GLOSSARY

TERMS

AND

ABBREVIATIONS.

.79

Contents

The

information

this

MIM

be used as reference

material

when

diagnosing

machine

failures. This M

contains

maintenance

procedures,

tools

and

test

equipment

information,

and

theory.

The

format

for

page

numbering

XXX.Z.

XXX

the

number

the

page

and

(although

not

normally

used)

for

expansion

when

not

practical

give new

numbers

all pages.

Three-digit reference

numbers

are

assigned

location

drawings

and

maintenance

procedures

refer from

the

MAPs.

Maintenance

Procedures

Section

The

maintenance

procedures

section

contains

location

drawings

and

maintenance

procedures

for

repairing,

installing,

diagnosing

the

failing field-replaceable unit.

How

Use

Manual

Tools

and

Test

Equipment

Section

The

tools

and

test

equipment

needed

service

the

diskette

drives are described

the

tools

and

test

equipment

section.

Theory

Section

The

theory

section

contains

descriptions

the

functional

units

and

features. These

descriptions

are

preceded

view

the

diskette

unit

which gives

you

a general idea

the

complete

operation

and

where

each

function

feature

fits in.

Index

The

index

a detailed list

all material in

the

and

the

pages

which

that

material

located.

How

Use

This

Manual

vii

viii

How

Use

This

Manual

The

diskette

drives need

scheduled

maintenance.

The

MAPs guide

you

in diagnosing

diskette

drive failures.

The

MAPs refer

maintenance

procedures

this

manual

when

adjustment,

service

check,

FRU

replacement

needed.

All

maintenance

procedures

are

written

with

the

assumption

that

the

drive assembly has been removed

from

the

enclosure

and

fully accessible

work

surface.

might

be practical

some

instances,

perform

specific

procedures

without

removing

the

drive assembly. These

instances can

best

determined

the

individual

circumstances.

The

head/carriage assembly

and

the

drive

hub

and

spindle

pulley assembly

are

adjusted

and

tested

the

factory.

The

drive

hub

and

spindle pulley assembly are

not

field-replace-

able units.

the

track

adjustment

surface

the

drive

hub

and

spindle

pulley

assembly are damaged,

you

should

replace

the

entire

diskette

drive assembly. The

head/

carriage assembly

a field-replaceable

unit.

Maintenance

ilosophy

The

main

differences

between

the

31SD

diskette

drive

(for

the

diskette

and

the

diskette

drive (for

the

diskette

and

2D) are

the

head/carriage assembly

and

the

layout

the

diskette

drive

control

card. Maintenance

procedures

that

are

affected

by such differences will provide

two

distinct

sets

instructions

within

the

affected

step.

These

distinct

differences will be labeled (31SD) and

(51TD)

as in

the

following

example:

Remove

the

cover.

Disconnect

the

cables.

(31 SD) Remove

the

head/carriage assembly.

(51 TD) Insert a clean piece

paper

between

the

read/write

heads

and

remove

the

head/carriage

assembly.

Invert

the

assembly.

When

the

callout

a figure

not

affected

the

difference

between

the

drives,

the

31 SD drive figure will be

used.

those

instances

where

the

callout

affected

the

difference,

the

drive figure will also be used.

Maintenance

Philosophy

Safety

The diskette drives contain the

following

specific

DANGERS:

• Voltages

are

present on the connector terminals in the

diskette drive.

•

Motor

and solenoid

cases

become

hot

after continuous

use;

allow

enough

time

for

parts

cool before servicing.

DANGER AND CAUTION NOTICES

Throughout

this manual, the

word

DANGER

used

inform

the

action

that

could

cause

a personal

injury.

The

word

CAUTION

used

inform

the

action

that

could damage the machine,

affect the

running

a customer program.

Danger Notices

Danger notices appear in the

following

maintenance

procedu

res:

337 Head/Carriage Service Check

339

Head/Carriage

Adjustment

341 Head/Carriage Removal

and

Replacement

343

Solenoid and

Bai

I Service Check

346

Solenoid and Bail

Adjustment

347 Bail Removal and Replacement

349

Solenoid and

Idler

Removal and Replacement

351

Drive

Motor

Removal and Replacement

353

Capacitor Removal and Replacement

355

Drive Fan and Pulley Removal and Replacement

373

PTX

Amplifier

Service Check

Safety

Caution Notices

Caution notices appear in the

following

maintenance

procedures:

335

Collet/Flat

Spring Removal and Replacement

337 Head/Carriage Service Check

339

Head/Carriage

Adjustment

340

Pressure

Pad

Removal and Replacement

341 Head/Carriage Removal and Replacement

346

Solenoid and Bail

Adjustment

347 Bail Removal and Replacement

357 Stepper

Motor

Removal and Replacement

363

Drive Band

Adjustment

365

Drive Band Removal and Replacement

375

PTX

Removal and Replacement

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