IBM 2310 Maintenance Manual

Field Engineering
Maintenance Manual

~~~@

Disk

Storage

Field Engineering
Maintenance Manual

Issued to:

Branch

Department:

Address:

____________

Office:

____________

___________

___________

If

this

manual

be

returned

is misplaced, it should

to

the

above address.

_

_

_

_

~~~@

Disk

Storage

PREFACE

This

manual

Users

of

are

subject

notice

by
gineering
included

The

Storage

alone

Drive.

unit
System,
of

the

IBM 1130

within

the

This

tions

which

ment

malfunctions

perform

ment

in a state

CE

must

equipment,

plications

derived

from

Alternate

ment

in

the

serial

numbers

Content

chapters.

contains

this

manual

to

change

IBM.

Wiring

change
in
scope

each

level

machine

of

this

The

for

IBM 1800

and

is

an

Computing

IBM 1131

information

enable

corrective

of

have

completed

and

must

of

the

maintenance

training.

procedures

back

of

00001

of

this

preliminary

are

cautioned

at

any

diagrams

for a specific

shipment.

manual

machine

Data

integral

Central

consists

the

CE

to

in

the

Disk

maintenance

readiness

prior

be

familiar

are

this

manual

through

manual

time

and
(logics)

is

limited

is

installed

Acquisition

part

of

System,

Processing

of

maintenance

rapidly

Storage

to

for

the

IBM

with

concept

provided

for

00050.

is

divided

information.

that

specifications

without

at

the

machine

to

the

in a stand

and

the

storage

physically

Unit.

diagnose

Drive

keep

the

equip­customer.
training

for

practical

and

techniques

in a supple-

machines

into

seven

prior

en-

are

Disk

Control

system

located

instruc-

equip-

and

The

this

ap-

with

Chapter 1 contains
diagnosing
use

of

and

service

isolating

aids

and

Chapter 2 describes
the

CE

to

accomplish

ations.

Chapter 3 contains
scheduled
ule

for

maintenance

accomplishing

Chapter 4 provides
adjustments,

and

removal

ponents.

Chapter 5 provides a listing
and

power

sequencing.

Chapter 6 contains
CE

to

locate
gages,
contained

etc.,

in

components,
which

are

the

manual.

Chapter 7 consists

vides

alternate

with

serial

The

ing

Manual
227-5985-1)
operation,
information

procedures

numbers

companion

of

Instruction

provides

and

may

contained

00001

publication,

be

instructions

equipment

functional

checkout

switches

checkout

and

instructions

and

includes a tabulated

periodic

maintenance

instructions

and

replacement

of

information

major

assemblies,

described

of a

by

supplement

applicable

through

IBM

2310

Disk

information

used

within

for

as a reference

this

manual.

and

procedures

malfunctions

procedures.

and

controls

maintenance

for

performing

operations.

for

service

of

power

requirements

which

enables

the

instructions

which

to

machines

00050.
Field

Engineer-

Storage

the

(Form

theory

to

for

by

the

used

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sched-

checks,

com-

the

meters,

pro-

of

augment

Copies

of

th is

and

other

IBM

publ

ications

can

be

Comments

IBM,

©

Product

1965

concerning

Publications

by

International

the

contents
Department,

Business

of

this

Machines

publication

San

Jose,

obtained

Calif.

may

through

be

95114

IBM Branch

addressed

Offices.

to:

ii

CONTENTS

CHAPTER 1 DIAGNOSTIC

1. 1 Diagnostic

1.2

Functional

1. 3

Read

1.3. 1 Read

1. 4

Write

1.

4. 1

1.5

Access

Techniques
Check.

Malfunctions

Circuit

Malfunctions

Write

Circuit

Malfunctions

1.5. t Access

1. 5. 2

1. 6 Base

1. 7

CHAPTER

2. 1

2.

2 CE Disk

2.

3 CE

2.4

Detent

Plate

Troubleshooting

Aids

7. 1

Track

7. 2

Disk

Homing

7. 5 Errors

Component

••••••••••••••••••••••••••••
Addressing

Formatting

Retry

and

1. 6. 1

Service

1.

1.

1. 7. 3 Error

1. 7. 4

1.

2 MAINTENANCE FEATURES

Leading

Particulars

Cartridge
Control
Switches

Panel

.•••••••••••••••••••••••••••

Select

Mode

CE

2.4. 1 Head

2.4. 2 Step

2.4. 3 Direction

2.

2.5

4. 4 Step

Tools

2.

5. 1 Standard

2. 5. 2

2.5.3

and

Test

Special
Branch

Control

AIDS • • • • • • • • • • • • • • • •

.••••••••••••••••••••

• • • • • • • • • . • • • • • • • • • • • •

••••

; • • • • • • • • • • • • • • • • •

Troubleshooting

••••••••••

..•••••••••••••••••••••

Troubleshooting

.•••••••••••

•••••••••••••••••••••••

Circuit

Assembly

Malfunction

and

Malfunctions

Base

Troubleshooting

Rack

Troubleshooting

Plate

Components

••••••••••••.

••••••••••••••••••.••

Procedure

Procedure

the

Carriage

Data

Retrieva I .••••••••••••••

••••••••••••••

•••••••••••••••••

••••••••

.••••••••••••

.•••••••••••••.••••••••

.•••••••••••••••••••••••

•••••••••••••••••••••••••

~witch

Switch

Switch

Switch

Equipment

Tools

Tools.

Office

••••••••••••••••••

••••••••••••••••••••

•••••••••••••••••••••

••••••••••••••••••

•••••••••••••••••••

• • • • • • • • • • • • • • • • • • • •

• • • • • • • • • • • • • • • • • • • •

Tools

•.••••••••••••••••

;

•••••••••

•.••••

CHAPTER 3 SCHEDULED PREVENTIVE MAINTENANCE
PROCEDURES

3. 1 Approach

3. 1. 1

3. 1. 2 Electronic Circuits

3.

3,

3. 2 Scheduled

3. 2. 1

3. 2. 2 Lubrication

3.2,3

3. 3

Head

3.3. 1 Particle

3.3.2

3.3.3

3.3.4

CH-\PTER

••

,...........................

to

Visual

Scheduled

Inspection

Preventive

Maintenance

••••••••••••••••••••

.••.•.

1. 3

1. 4

and

Mechanical

Cleanliness

Cleaning

Drive

Disk

Particle
Non
Disk

Units

...•••.•

Maintenance

Read/Write

of

Belt

Tension

Cartridge

Damage.to
Damage

Particle

Damage

Cartridge

•••••••••••••••••••

Procedures

Heads

Machine

Adjustment

Scratch

Disk

to

Head

and

Read/Write

II

• • • • • • • • • • • • •

••••••••••••••••

Description

••••••••••••••

••••

•••••••••••••••••

4 SERVICE CHECKS, ADJUSTMENTS,

II

••

, • • • • • • •

•••

,.,

••

, • , • , • • •

,.,

Head

•••••

••

,.,..

,.,

••

,.....

Damage.

AND

REMOVAL PROCEDURES • • • • • • • • • • • • • • • • • • • • •

4.0

Index

of

Service

Checks,

4. 1 Drive

4. 1. 1

4.

1. 2

4.

1.3

Motor

Drive
Drive
Spindle

and

Drive

Belt

Removal

Motor

Assembly

Adjustments

Belt

Removal

Removal

••••••••••••••••••

and

and

and

Replacement

Replacement.

and

Replacement

Removals

• • • • •

• • •

••

1. 1

1. 1

••

1. 1

••

1. 1

1. 1

_

••

1.2

1.2

1.4

•••

1.4

•••

1.4

1.6

1.6

1.6

1.6

1.6

1.7

1.7

1.7

2.1

2.1

2.1

2.1

2.1

2.1

2.1

2.2

2. 2

2.3

••

2. 3

••

2. 3

2.3

3. 1

3.

1

3.

1

••

3. 1

3. 1

••

3. 1

3.1
3,

1

3. 1

••

3.4

••

,.

3.4

,

3.4

3.4

3.4

••

3.4

••

4.

1

••

4.

1

4.

2

••

4.2

••

4.2

••

4.2

4. 2 Cartridge

4.

2. 1

4.

2.

2

4.

2. 3 Disk

4.2.4

4. 3 Plenum

4.

3. 1 Plenum

4.3.2

4.4

Blower

4.4.

1 Blower

4.4.2

4.4.3

4.4.

4 Blower

4. 5 Actuator

4.

5. 1

4.

5. 2

4. 6 Drive

4.

6. 1

4.

6. 2

4.7

Detent

4.7. 1 Detent

4.7. 2 Detent

4.7.3

4.7.4

4.8

Head

4.

8. 1

4.8.2

4.

8.3

4.9

Head

4.9. 1 Head

4.

10

Crash

4.

10. 1

4. 10. 2

4.

11

Home

4.

11. 1

4.11. 2 Home

4.

12

Tachometer

4.

12. 1

4.

12. 2

4.

12.3

4.

13

Carriage

4. 13. 1

4.

14

Carriage
Replacement.

4.

14. 1

4.

15

Carriage

4. 15. 1

4.

16

Read/Write

4.16.1

4.16.2

4.16.3

Assembly

Cartridge

Visual

Height

Disk

Cartridge

Air

Filter

Plenum
Assembly

Blower
Blower

Assembly
Actuator
Access

Magnet

Drive

Drive

Assembly

Detent
Detent

Load

Assembly
Head
Head
Heads
and

Adjustment

Load

Spring

Replacement

Stops

Front
Rear

Switch.

Home

Tachometer
Replacement
Tachometer
Tachometer
Replacement

Rail

Carriage

Preload

••••••••••••••••••••••••

Service

Check

Inspection

and

Run

Replacement

••••••••••••••••

•••••••••••••••••••••
Out

Check

Conditions

•••••••••••••••••••••••••

Filter

Flow

Test

Air

Filter

.,

••••••••••••••••••••••••
Assembly
Wheel

Removal

Scroll

Removal

Motor

Removal

Removal

Removal

and
and

•••••••••••••••••
and

and

and

Replacement
Replacement
Replacement

•••••••••••••••••••••••••

Assembly

Removal

and
Adjustments
and

Coil

Removal

Removal

and

Detent

Removal
Adjustment

••••••••••••••
and

and

Replacement.

Rack
Removal
Adjustment

and

••••••••••••••••

Replacement

• • • • • • • • • • • • •

and

•••••

Replacement

Magnet

Coil

Assembly

Assembly
Rack
Rack

••••••••••••••••••••••••

Load

Load

Loaded

Load

Solenoid
Assembly

Assembly
Spring

Removal

and

Adjustment

Switch

Removal,

•••••••

,..............

• • • • • • • • • • • • • • • • •

Assembly

Removal

• • • • • • • • • • • • • • • • • • • • • •

• • • • • • • • • • • • • • • • • • • • • • • • • • •
Crash

Stop

Stop

Adjustment

Adjustment.

Crash

• • • • • • • • • • • • • • • • • • • • • • • • •
Switch
Switch

and

Tachometer

Removal

Adjustment

Extension

and

Replacement

•••••••••••••••
Extension
Rod

Removal

.••••••••••••••
Extension
Assembly

Rod

Adjustment

Removal

.••••••••••••••••••••••

•••••••••••••••••••••••••••
Rail

Removal

Bearing

and

Assembly

Replacement.

Removal

• • • • • • • • • • • • • • • • • • • • • • • • •

Carriage
Replacement

Carriage
Replacement

Read/Write
Read/Write

Read/Write

Preload

Subassembly

Subassembly

Heads

Head
Head
Head

Bearing

Assembly

•••.•••.•••.•••

•..•••••••..••
Removal

. . • • • • • • . • . • • • • • • . . •

.••••••••••••••••••••

Service

Check

Replacement

to

Base

Plate

• • • • • • • • • •

•••••••

Replacement

Replacement

••••••

••••••

Replacement

,

•••••••

• • • • •

Replacement

, • • • • • •

••••••

Replacement

•••••••••••

Replacement,

and

•••••••••••••

• • • • • • • • • • •

•••••

Rod

• • • • • •

and

, • • • • •

and

and

Removal

and

.•.••••••••
.••.•.••.••

Resistance

Chccl< •

• •

•••

and

4.

2

4.

2

4.

3

••

4.

3

4.4

4.4

4.4

4.4

4.4

4.4

4.4

4.5

4.5

4.5

••

4.5

4.5

4.9

4.9

••

4.

10

••

4.

10

4.

10

••

4.

10

4.

10

4.

12

4.12

••

4.12

4.12

4.

14

••

4.

14

••

4.

14

••

4.

14

4.

14

••

4.

14

••

4.

14

4.

14

4.14

••

4.

14

••

4.

14

4.15

4.

15

4.

16

••

4.

16

••

4.

16

4.16

4.16

4.

16

1.

17

4. 17
'1.17

4.17

iii

4.

17

Head-Arm

4.17.1

4. 17. 2

4. 18

Cartridge

4. 18. 1

4.

18.2

18.3

4.

4.

19 Interlocks . • • • • • • • • • • • • • . • • • • • • • • • • • •

4.19.1

4.

20

Sector

4.

20. 1

4.20.2

4.21

Data

4. 21. 1

CHAPTER 5 POWER

5. 1

Power

S.

1. 1 AC Input Supply Power

5. 1. 2 DC Input
Power

5. 2

5. 2. 1

2.

5.

5. 3

Power Line

5. 3. 1 Input

CHAPTER 6

6. 1

General...............................

CHAPTER 7

MAINTENANCE

7.1

Purpose

7.2

Alternate

7. 2. 1

7.2.2

7.2.3

7. 3 Plenum

7.3. 1 Plenum

7.3.2

7.4

Blower Assembly

7.4.

7.4.2

7. 5

Actuator

Assembly

Head
Head
Replacement

Receiver
Cartridge
Replacement
Cartridge
Cartridge

Handle

Transducer
Sector
Sector

Replacement

Separator.

Data

Separator

Requirements

Sequencing

Power

On

2 Power Off

Interface

Power Lines

LOCATIONS

SUPPLEMENT FOR ALTERNATE

INSTRUCTIONS.

of

Supplement

Maintenance
Identification
Special
Branch

Cover

Plenum

1 Blower

Blower

Assembly

Assembly
Motor

••••••••••••••••••••••

Arm

Assembly

Arm

Assembly

Receiver

Receiver
In

and

Transducer
Transducer

• • • • • • • • • • • • • • • • • • • • • • •

SUPPLY

Supply Power

•••••••••••••••••..••.•.

Sequence

Sequence

Tools

Office

and

Filter
Cover
Air

Filter

.•••.••••••••••••.•••.

Adjustment

.•••••••••••••••.•••••

• • • • . • • • • • • • • • • • • • • • •
Removal

••••
Adjustment

Place

Switch

Interlock

.••••••••••••••••••••••

Index

Removal

• • • • • • • • • • • . • • • . . . • .

Adjustment

••••••••

. . • • • • • • • • • • • • • • • • • • •

• • • • • • • • • • • • • • • • •

•••••••••••••••••.

••••••••••••••••••••••

to

Disk

••••••••••••••••••••••

.•••••••••••.••••••••

Features

of

Machines

••••••••.•••••••••••••

Tools

•.••••••••••.•••••

.•••••••••••••

Removal

Removal

Removal

Removal

Removal

• • • • • • • • • • • • • • • •

Adjustment

•••••••••••••.••

••••••••••••••••

• • • • • • • • •

and

and

.•••.•••••

and

and

.••••••••.

Adjustment

••••••••••

Timing

Adjustment

and

.••••••••••••

• • • • • • • • • •

Storage

Drive

•••••••••••••••
.•••••••••••••

Replacement

and

Replacement

••••••••••••••

Replacement.

••

•.••••

••.••

• • • •

• • • •
.•••

• •

4. 17

4.17

4. 17

••

4. 19

••

4. 19

4. 19

4.20

••

4.20

4.20

4. 22

.•

4.

••

4. 24

••

4. 24

4. 24

•.

5. 1

••

5. 1

5. 1

5. 1

5. 1

••

5. 1

5. 1

5. 1

, 5. 1

·6.1

6. 1

••

7.1

7.1

7.1

7. 1

7.1

7. 1

••

7. 1

7. 1

.•

7. 1

7.2

••

7.2

" 7. 2

22

7.5. 1 Actuator

7. 6 Drive

7.7

7. 8

7.9

7. 10 Crash Stops

7.

11

7. 12

7.

13

7. 14

7. 15

7. 16

7. 17 Interlocks • . • • . • • • • • • • . • • • • • • • • • • • • . •

7. 18

INDEX.

Replacement

Magnet

7.6.

1 Drive

7.6.2

Drive

Detent

Assembly

7.7. 1 Detent

7. 7. 2

Detent

7.7. 3 Detent

7.7.4

Detent

Head

Load Assembly

7. 8. 1

Head
Replacement

7.

8.

2

Head

Head

Load Spring Assembly

7.9. 1 Head
Spring

7.10.1

H:>me

7. 11. 1

7.11. 2 H:>me

Tachometer

7. 12. 1

7. 12. 2

12.3

7.

Carriage

7.13.1

Carriage

7. 14. 1

Head-Arm

7. 15. 1

Cartridge

7.16.1

7.

16.2

7. 17. 1
Sector

7. 18. 1

. • • • • • • •

Assembly

.••••••••••.•••••••••••••••
Magnet
Magnet

Assembly

Assembly

Rack
Rack

Load

Load

Load Spring

Adjustment

••••••••••••••••••••••••••••

Rear

Crash Stop

Switch

Handle
Transducer.
Sector

.•••••••••••••.•••••••••••

Home

Switch
Switch

and
Tachometer
Tachometer
Tachometer

Replacement

Rail

••••••••••••••••••••••.•••

Carriage

Carriage
Replacement

Head-Arm

Cartridge
Replacement
Cartridge

Rail

Subassembly

Subassembly

Assembly . • • • • • • • • . • • . • • • • • • •

Receiver

and

Transducer

••

Removal

.••••••••••••••••••••••

Removal
Adjustment

and

Detent

Removal

Adjustment

Removal

Adjustment

.•••••••••••.•••••••.••

Solenoid

••••••••••••••••••.••••

Assembly

Assembly

. • . • • • • • • • • • • • • • • • • •

Adjustment

Removal
Adjustment

Tachometer

Extension Rod
Extension Rod
Assembly

.•

• • • • • • • • • • • • • • • • • •

Removal

•••••

••••••.•••••••••••••••

Assembly

• • • • • • . • • • • • • • • • • • • • •

Receiver

..•••••••••••.•.••••..

Receiver

Interlock

. • . • • • • • • • . • • • . • • • • • •

Index

• • • • • • • • • • • • • • • • • • • • • •

and

and

Replacement

.•••.••••••••••

Rack

•••••••••••.••

and

Replacement

.•••••.••••.•

and

Replacement

.••••••••.•••••

Removal

Adjustment

Removal

Adjustment

and

.•••••••••••••••••

and

Extension Rod . • • • •

Removal

and

• • • • • • • • . • • • • •

Removal

Adjustment

Adjustment

••••.•••••

Counterbalance

••.•••••••••

Replacement

•.••••••••••••

Removal

Adjustment

and

Replacement

and

and

•••••.•...

Timing

Adjustment

•••••

• .

••••

.••••••

.•••

•.•••••••

.••••.•.•

•••

••

.•
.•

••

••

••

••

•.

.•

7.2

7.3

7.3

7.4

7.4

•.

7.4

7.4

7.5

7.6

7.6

7.6

7.6

7.9,

7.9

7.9

7.9'

7.9

7.9

7.9

7. 10

7. 10

7. 10

7. 11

7. 11

7.11

7.

11

7.

11

7. 12

7. 12

7. 13

7. 13

7. 13

7. 15

7. 15

7. 15

7. 15

I.1

iv

Personal

sure

to

follow
familiar
mM
to

all

AC

The
Storage

the

spindle

when
tact

shields

Isopropyl

Use

2155966)

types
to

impurities.

safety

your

own

safety

with and

cards,

Forms

Customer

Power

Start

and Stop

Drive

machine

but

drive

servicing

110/220-volt

and

covers

Alcohol

only

mM

for

cleaning

may

cause

is a flammable
quantity

needed

office.

Keep

the

hol

in

the

sealed

When shipping

with

the

appropriate

tainer)

for

shipment

cannot

safety,

precautions

use

124-0002 and

Engineers.

switches

do

not

simply

motor.

the

machine

connections

provided.

approved

damage

The

91%

liquid,

for

impending

plastic

bottle

metal

91%

regulations
of

be

overemphasized.

make

it

an

at

all

safety

practices

on

apply and

energize

Caution

must

since

despite

91%

Isopropyl

of

read/write

and/or

isopropyl

therefore,

use

containing

container

isopropyl

flammable

every

day

times.

outlined

M04-8401,

the

mM

2310

turn

off

ac

and

de-energize

be

exercised

objects

the

can

safety

Alcohol

heads.

contamination

alsohol

keep

only

in

the

customer's

isopropyl

except

when

alcohol,

(noted on

liquids.

To

en-

practice

Become

in

issued

Disk

power

con-

(P/N

Other

due

solution

the

alco-

in

use.

comply

the

con-

to

the

Never

disassemble a disk

cartridge

assembly

which cannot

The

disk
otherwise
stored
this
which
tridge
the

subjected

on a protruding

nature

effects

housing.

cartridge

read/write

Disk

Cartridge

DC

power

must
cartridge.
dc

power

is

riage

returns
inserted
riage
the
contains
condition
neer

without

could

cartridge

interlocking

from

violates

switches.

CE

Restricted

Do

not

write
through
tracks

other

110.

95,

100, and 105 which

tracks

be

disassembled

cartridge

could

result

centering

Damage

unusable

heads.

Insertion

always

The

machine

on, and ac

to

home
first

be

in

some

could

strike

occurring

or

overrides

Tracks

on

the

CE

This

band

may

be

cartridge.

is a permanently

without

should

to

top

object.

in

of

and

be

power

position.

turning

position

switches

on

disk

used

never

loading.

deforming

the

disk

to

the

could

into

Machine

on

before

is

interlocked

is

on

the

heads.

which

unless

the

safety

Disk

Cartridge

cartridge

contains

will

for

test

Handling

within

diaphragm

cause

turned

If

the

dc

other

the

prerecorded

be

purposes.

The

encased

damage.

be

stacked

Nor

should
practices

the

diaphragm

the

will

damage

insertion

so

that

off,

cartridge

power,

than

home,

The

machine

prevent

Customer

function of

at

tracks

destroyed.

SAFETY

disk

unit

or

it

car-

render

to

of

the

when

the

car-

is

the

car-

this

Engi-

these

90

test

be

of

and

Any

WARNINGS:
Disk

Storage
eration
are

described

icing

procedure.

listed

below.

Disk

Cartridge

Cleanliness
disk

cartridge.

the

read/write
opened when
cept

when

to

clean
bottom
Serious
foreign

There
Drive

or

improper

must

the

using

disk.

surface

damage

particles

are

can

servicing

in

the

text

The

Handling

be

maintained

The

heads

cartridge

the

disk

Also,

of

the

to

disk

are

many

be

damaged

under

most

Significant of

cartridge

must

never

is

out of

cartridge

the

air

valve

cartridge

surfaces

introduced

ways

in

which

by

improper

techniques.

the

appropriate

while

handling

door

which

be

unlatched

the

machine
cleaning
located

must

never

could

result

inside

the

the

2310

These

serv-

these

are

the

receives

and

ex-

fixture

on

the

be

opened.

if

cartridge.

op-

Read/Write

Avoid touching
Acids

from

Do

of

the

machine,
system
load

heads

card

should
gliding
heads

must

done.

Machine

Head

loading

ating

the

is

to

provide

v

Heads

the

not

load

is

not

operating.

under

be

surfaces

be

Operation

precautions

machine.

ac

the

gliding

skin

can
leads
when

these

inserted

from

cleaned

Proper

and dc

surface

etch

and

manually

disk

is

stopped,

If

it

becomes

static

conditions,

between

possible

damage.

immediately

must

be

operation

power

to

of

read/write

ruin

the

head.

when a cartridge

or

when

necessary

a folded IBM

the

heads

to

protect

Read/write

whenever

observed

of

energize

the

the

this

when

machine

hlower

heads.

is

out

blower

to

is

oper-

system
is
raised
Power
and

motor
cartridge
operated

then

the

If

power
without a

to
is

and home

inserted,

lower

the

applied

spindle will

is

applied to

cartridge

in

place

to

energize

the

carriage.

and

the

cartridge

to

the

come

switch

the

receiver

disk

up

the

present,

can

motor

onto

drive

to

be

to
ing of heads; however, a folded
should

be

inserted

between

the

protection.

The

handle
the

motor

speed.

disk

manually

effect

mM

heads

cartridge

is

spindle.

drive
the

load-

card

for

DC

Power

The

+3

vdc,

to, and

removed
prevent
Storage

plied

damage to
Drive.

without
Tachometer
Turn

off dc

cable.
trolled

If

this

with

-3

vdc, and

from)

the

internal

The +48-vdc

all

other

dc voltages being

Cable Removal

power

before

is

not done,

resulting

damage to

+6

vdc

power

machine

circuits

power

removing

accessing

the

at

the

of

must

the

may

access

the

must

be

applied

same

time

2310 Disk

never

be

present.

tachometer

be

uncon-

mechanism.

to

ap-

vi

1.1

DIAGNOSTIC TECHNIQUES

CHAPTER 1 DIAGNOSTIC

1.

2 FUNCTIONAL CHECK

AIDS

WARNING:
circuit
part

of

with

the

could

cards.
the

circuit.

d-c

damage

Voltage

Metal

power

on,

transistors

is

Avoid

circuit.

WARNING: A potential
head

pick,

cartridge

.voltage

is

probing

avoid

regulator

present

near

possible

for

circuits. A potential

write

circuits.

SLT

cards

shorts

damage.

Intermittent
by

vibration.

plastic

should

vibrations

problems

Tapping the edge of

handle of a

be

sufficient.

can

cause a short

screwdriver

components.

Conditions
jumper
outputs
taken
during
result.
ages
For

placed

other

in

to

to

these

which

the

majority

ground

cases

ensure

More

knowledge of

Special

system

diagrams.

waveforms

When
positioning of
properly
the

gate.

outer

edges
minimize
interferes

provide a preload

signals

check

checks,

important,

can

will

must

the

circuit

for

the

electronic
SLT

replace

This

of

the

card

vibration.

with the

will

arise

or

certain

that

logic

damage

of logic

create

be

treated

circuits

card
Also shown

most

of

cards,

the

support

cards

bottom

on

ends

present

caps

on both

of

transistors

pulling

since a resultant

or

other

of

+48

volts

lock,

access

Exercise

containing

which could

can

sometimes

in

Use

caution

circuit

where

voltages

it

to

specific

functions.

blocks

as

erroneous

are

avoid the

or

destroy

block

cases, a properly

the

effect

individually

involved.

diagrams

are

these

cards.

gate

is

opened

care

should

SLT

card

support

serves

with

The

of

of

to

the

support

the

electronic

the

SL T

gate

sides

of

are

often a

or

replacing

short

components

is

present

amplifier,

these

result

be
cards
the

area

because

in

is

desirable

and

of

+36

care

when

circuits

in

extensive

aggravated

with

the

suspected

excessive

adjacent

volts

inputs

Care

should

not

overloaded

indications will

use

of high

the

transistors.

desired.

All

based

are

shown

in

input and output

to

check

be

taken

before

rigidly

housing

closing

brace

to

normally

gate

cards.

most

cards

circuit

in

the

for

to

card

to

or

be

volt-

on

the

the

to

the

to

The functional check

ment

without
Central
that

the

selection,

head
will

perform

The CE

come

active
between
nected.
control
tically
vertent
CE to

examine

using

Processing

drive

actuator,

and

as

required.

control

only when the CE

system

control

Upon disconnecting

circuits,

placed

erasure

the

in a read

of

the

The functional check

NOTE:
writing

1.

2.

3.

4.

5.

No

CE check

information.

Remove CE

Ensure

Install

Energize

ac

and dc

CE

cartridge.

drive

Interlock

Using CE SWitches,

each

head

to

determine

satisfactorily.

1.3

READ MALFUNCTIONS

1.

3. 1 Read

All

are

coupled with

set

and
incompatibility
write
card

when

When
Ready condition
and the
(track

to

rotate.

Circuit

read/write

the

produces a write

exists

lines.

Always
neither
the

Write-Lock

read

is

carriage

000) and

will

stop

provides

signal

for

control

Unit (CPU).

carriage

start/stop

panel

equipment functions

contains

Interlock

and

the

IBM 2310

this

disk

storage

select

mode
recorded
read

is

is

data,

circuit

to

be

accomplished

provided

and

signal

power

is

available

motor.

access

carriage

that

Troubleshooting

safety

circuits

write

lock

latch,

select

error

at

gated

outputs

check

the

write

nor

write

latch

becomes

removed

while

access

the

from

to

home

disk

operating

circuits

This

check

access

motion,

switches

signal

cable

from

drive

is

to

prevent

and

to

allow

recorded

on

the

2310

cable.

to

and

machine

operates

(Figure

in

the

machine

which

signal

from

driver

operations

set,

the

machine,
position

will continue

the

of the

verifies

which

cable

is

discon­system

automa-

inad­the

data.

as

follows:

for

machine.

select

1-1)

becomes

when
read/
SL T

function.

File

equip-

be-

227-5984

(9/65)

1. 1

It

will be

drive

motor

set

the

a

File

Ready

WARNING:
pers

of any kind on
read/write
or

data

these

points.

The

the

Preamplifier/Write
Amplifier
All

cards

The

signal input to the
pattern)
from

.

the
double frequency
The

read

necessary

to

reduce

to

disk

turn

speed

latch --then power up

status.

Do

not put scope

lines

comming

heads. The

destroyed

read

circuits

by

heads

the

presence

consists

Driver

SLT

Card,

and Data

are

located

preamplifier

and 726

read

amplifier

gate

is

in

the

circuit

read

amplifier

KC

(all

one's
is

single ended, and

data

to

the

the only gate

electronic

off power

to

the

machine to

probes,

can

of
SLT

Separator

provides

of 360

pattern). The output

data

separator

required

amplifier.

A CE

Test

Point

and

is

located
plifier
tiator

TP
sured

mum to 3.

with

age will
side
speed

shoot

for

Both Heads

for

CE

use.

circuit

D2

at

is

G07. Output of

pin

location

The voltage

15

v maximum.

respect

to

prevail

track

because

relative

to

The following

read

circuits:

read/write

in

2310

Input to

measured

at

TP

n2

the

B03.

D2

at
detector

G07

This

the

track

being

at

the

outside

of

the

difference in

the

read/write

analysis

is

Oscilloscope display

circuits

Fail

are

to

shown in

Read -

the

amplifier

the

CE

should be 1. 5 v

voltage will

read. A higher

track

head.

to be used

1. Heads not loaded. Check visually.

2.

Carriage

at

incorrect

cylinder

Check visually.

DC

3.

voltage supplies not

is

an

unsafe condition. Check interlock SLT

In a

read

select

mode,

should be

set.

at a correct

the

write

NOTE: Voltages should be checked

4. Head not
head

ground

5. Data
Check

selected,

select

line

level

separator

for

Read Clock output on C2

(+3 v level

for

head

circuit

or

both heads

one).

has

for

improper

Read Data output on C2 D05.

6. Read

signal
card

amplifier

at

at

location

has

detector

no output. Check

circuit

D2

B03.

on

read

to

the

30 RPM to

leads,

directly

from

be damaged

of voltages

read/Write

Card,

Read

SLT

gate.

a differential

KC

(all

SLT

by

the

on the

read

differen-

Test

amplifier,

circuit

than

disk

is

at

the
surface

to

trouble-

patterns

Figure

Probable

to

read

1-1.

causes:

disk.

level.

lock

latch

at

the

SLT

selected.

head

zero

output.

D03

and

for

amplifier

re-

attain

or

jum-

and/

at

heads,

card.

zero

provides

card.

read

am-

mea-

mini-

vary

volt-

in-

This

card.

board.

Check

and

output

SLT

7. Read

2310 Reads But

amplifier

has

ence of input signal

circuit

Point

on

TP

read

D2

amplifier

G07.

Generates

no input. Check

at

Amplifier

SLT

Read

Differential

card

Errors -Probable

at

for

CE

Causes:

1. Machine
a.

Head
operative.
for

b. Line

that
isolated

c.

Open head diode(s). Replace

write

select

transistor

Check

malfunction of

noise

present

head-arm

driver

from

assembly

frame

card.

particular

for
write
head

in

read

ground.

driver

select

is

head:

this

head

SLT

transistors.

signal. Check

electrically

preamplifier/

fails

to

read

on a

d. Disk speed detection output fluctuates. Check

for

sector

Possible

e.

Data
provide Read Clock output
Read Data output

separator
shot which

permit

f. Head shoe dc

plate

g.

Intermittent

coils

h.

Heads

2. Machine
ticular

head.

a. Disk Speed

Check

b. Weak

proper

Check

proper

c. Head shoe dc

plate

d. Bad head. Check

amplifier

e.

Intermittent
preamplifier/write

f.

Intermittent
SLT

g. Head

of

read/write

1.4

WRITE MALFUNCTIONS

1.4. 1 Write

write

apparent

select

NOTE: An
by a

time

of 5

ms

between

that

speed

detector

separator

data

should

and ground of

improperly

makes

for

read

loading of head

for

force

should

circuit

adjustment

gates

pulses

resistance

be

5 ohms

short

defective --does not

at

C2D05. Check

of 600

between clock

to

pass.

relative

or

between

read/write

aligned

frequent

detector

read

errors

output fluctuates.

defective speed

signal

at

head. Check

against

defective head. Check

on head-load spring.

resistance

be

output

open

5 ohms

at

in

relative

or

for

presence

pin

location D2B03.

head diodes. Replace

driver

head

select.

card

for

malfunction of head

is

out of alignment. Check alignment

head

with CE

Circuit

Troubleshooting

failure

error

to

condition when the

write

pulses.

is

defective.

at

C2D03

nsec

single

pulses

to

less.

coils,

or

head.

to

read

on a

detector.

disk

for

to

less.

of

SLT

card.

Check

write

select

track

100.

(Figure

can

be

Write

track.

for

read

data

caused

pres-

Test

is

in-

card

and/or

to

base

between

par-

im-

surface.

im-

base

driver

circuit.

1-1)

Lock

1.2

100Y/CM

~

/'

r

.-

V.

....

i!.

T

Iu

1.-

~

.,

.r..

r

...

.J~

r

....'11

..J

1/

E2B08

Write

Oscilla-

tor Output

nal

Sig-

500Y/CM

Oo5},lS/CM

Oo5Y/CM

1\

I.

II

/~

j

\1

1\.

/

\

I/fI1'

"

\

~

f

\

/\

L

~

\ J

\

\

-.

.,

.J

'\

\

'u

~

I

I

Write Resistor
Peak-to-Peak
Yoltage

\.

Read

\

.,

AT
(After Differen­tiation)

H2D02

D3B07

Signal

CE

TP

~

(

100Y/CM

I

II

I

Oo2J.!S/CM

-

Figure

1-1.

Oscilloscope Display

227-5984

(9/65)

I

-)

\

of

Read/Write

\

\

~

(

Circuits

C2812

Data Separator
Fed
Osco TP

"""

and
ing 600nsec

gle Shot

Data

by

GOO

Bit

Write

G13

Show-

Sin-

Gating

C2B05

1.3

latch

becomes

set

because
malfunction. Check
read/write
write
trouble.
status

Information

the

write
complete
machine

line

driver

Refer

conditions

data
control

is

and

Write

The

write

safety

circuit

SLT

card

to

section

caused

to

be

written

line.

of the

conditioned

Clock Gate

circuits
Preamplifier/Write
Safety SLT
SLT

card.

card,

All

and

cards

gate.

The

write

amplifier
with

three

lines:

MC

Oscillator

the

write

of

The following

shoot

write

Both Heads

1.

Heads not

2.

Write

gate

write

data

line

should

erase

circuits

3.

Write

resistor
insufficient.
write

resistor

2310

Generates

1.

Intermittent

2. Output of
is

incorrect.

3.

Write

resistor
cient.
resistor

1.5

ACCESS MALFUNCTIONS

1.

5. 1 Access

The

access

SLT

card,

sembly,

and
components
duration

carriage

of

motion.

Write

Signal

signal

at

analysis

circuits:

in

2310

loaded.

is

not

to

enter

be

Peak-to-peak

Write

write

write

Peak-to-peak

should

Circuit

circuits

Access

detent

effect

control

drive

current,

of a

read/write

for a latched

before

or

read/write

1.

by

is

The

writing

system

to

write

line

consists

Driver

1.44

Mc

are

located

furnishes

Gate,

Line.

the

heads

Fail

to

Write -Probable

Check

at

the

the

at

ground

to

be

turned

voltage

should

be

Errors -Probable

driver

amplifier

voltage into

voltage

be

15

volts.

condition

investigating the

head

for

3.

1 which

setting

supplied

control

when

are

SLT

Oscillator

Write

of

this

to

process

the

at

ground

of

read/write

card,

in

the

the

write

Data,

lists

latch.

the

is

circuits.

Write

Write

and

electronic

The nominal dc voltage

is

+26

volts.

is

to

be

used

to

visually.

correct

machine.

level

level

for

to
The
write

on.

to

read/write

voltage

15

volts.

head

across

Causes:

or

write

amplifier.

on

write

data

the

head

is

across

the

Malfunction Troubleshooting

contain

Logic

mechanism.

the

Access

SLT

card,

These

of

detent

and dynamic

Amplifier

tachometer

circuits

operation,

braking

circuit

in

the

machine

2310 via

under

Gate

level.

heads,

Select

Trigger

driver

and a

trouble-

Cause:

allow

write

gate

and

is

the

lines

insuffi

write

as-

of

The

1.44

and

Whenever malfunction
circuits,
accomplished

1.

2. A 10

3.

4. A dynamic

and

justment

or

access
display
Figure

1.

5.

No
than
and

between

magnet
to
the
determine
acceptable
made

1. With

2. Use

the

following

according

A deadband

mize

decelerated

adjustment

carriage

to

milli-inch
adjustment
decelerating
limits

adjustment
A 10
timing

after

track

is

and stopping

for a single

is

ms

single

of

the

detent

the

carriage

location.

balance
smooth
carriage

Some of

it

will

detent

travel

these

be

necessary

whenever a

whenever

a new SLT

circuits

patterns

during

for

1-2.

2 Detent

adjustment

initially

Assembly

of

the

locating

establishing a clearance

the

clapper

is

energized.

check

odd-even

signal

on

track

that

spacing

limits. A check

as

follows:

the

CE

Cartridge
minutes
stabilize

to
aligned
even detent

the

CE

for

with

CE

track

properly

temperature

switches

100 and

will

location.

3.

Access
verify
with
engaged

the

the

that

test
at

carriage

heads

track.

this

is

four

adjustments

to

procedures

is

oscillations

arrive

made

made

and 20

to

step

for

shot

to

has

at

milli-inch

calibrate

increment. A separate
each

adjustment

correctly
been

adjustment

operation

between

adjustments

to

perform a complete

single

adjustment

card

troubleshooting.

access

and

and

detent

the

assembly

pole

circuits

Rack

assembly

The CE

detent

operation

100 with

the

between

of

installed,

temperature

to

access

verify

with

this

be engaged

to

CE

are

still

The odd

track

location.

suspected

of

accomplished

when

the

a new

track

integrator

the

carriage

stepping

provides

seat

accessed

is

made

for

both

directions

track

000 and

are

inter-related,

is

substituted

are

Troubleshooting

is

against

of

0.006

( to. 001) inch

piece

while

cartridge

by

comparison

signal

on

tracks

detent

is

operation

allow

of

the

cartridge

of

the

machine.

the

that

heads

test

track.

at

this

track

105 and

aligned

properly

detent

in

accessing

are

to

be

Chapter

carriage

to

4:

mini-

is

location.

set

trip

level

for

motion within

mode.

for

in

the

rack

to

a new

to

obtain

of

track

200.

ad-

is

disturbed,

in

the

Oscilloscope

shown

in

made

other

the

rack

the

electro-

can

be

used

of

track

105

within

is

15

to

carriage

are

The

track

will

be

to

1.4

2.0V/C

20j.lS/CM

M

K3D09

Transducer

1~'A

V

Drive
Output
tage

Coil

Vol-

20V/CM

2.0MS/CM

1.OV/CM

2.0MS/CM

..1-

l.

'"""'-i.

~

,

!-,-,-

~

i--

G2B04

Detent

Coil

Voltage

F3B09
Access Bridge
2-ohm

Feed-

Back Voltage

Figure

1-2.

Oscilloscope

227-5984

(9/65)

Display

of

Access

F2B09

Tach Signal

Voltage

Circuits

1.5

NOTE: It
apply a
carriage

4.

slight

to

Verify

may

check

that

pattern

(100 and 105). A
denotes
within

1.6

1. 6. 1
The

following

ponents

1.

Remove

located
from

2.

Check

allowable

BASE

PLATE

Troubleshooting

of

the

on

the

Sector

connections.

3.

sector
of
Check

ring

foreign

for

between

4.

Check

spindle

5.

Check

detent

detent

is

000) and

6.

7.

evenly

Check

Check

aligned
detent
head-load

movement.

S. Check

ness,
contact
ally

on

read/write

and

with

an

1. 7 SERVICE

These

instructions
malfunctions
the

CPU. A Symptom

applicable

failures

1. 7. 1

Since
information
position,
riage
detectable.
using
either
address

service

of

this

Track

the

2310

to

hardware

positioning

Therefore,

system

as

part

field

be

necessary

pressure

head

the

same

is

displayed

discrepancy

that

the

spacing

limits.

COMPONENT MALFUNCTIONS

procedure

base

plate.

cover

by

removing

cartridge-guide

machine.

transducer

Check

and

transducer
obstructions.
0 to

5-ohm

the

dc

gate

and

drive

mechanism

fully

engaged

that

odd

detent

with

rack

for

mechanism

head

check

head-load

heads

while

IBM

card.

AIDS

provide

which

interface

Index

Aids

type.

Addressing

does

not

provide

the

using

or

programming

or

head

record

of

the

address

data

along with

and

against

the

alignment

head

alignment

at

both

between

Base

Plate

is

to

be

posts

signal

to

determine

resistance

ground

belt

to

at

home

is

not engaged

crest

of

cleanliness.

flexure

spring

heads

for

diagnosing

with

(Figure

associated

any

system

except

selection

it

is

imperative

information

field

or

each

data

is

permissable

front

or

at

this

track

signal

track

locations

in

signal
detents

Components

used

to

check

two

retaining

and

lift

lines

for

that

are

free

from

when

and

the

base

for

proper

determine

position

detent

rack.

for

non-binding

springs

for

proper

are

loaded

machine

programming

1-3)

lists

with

machine

carriage

in

the

errors

are

not

that

on the

in a separate

record.

to

rear

of

location.

patterns

is

not

com-

screws

cover

good

slots

in

build up

measured

plate.

tension.

that

even

(track

but

is

for

tight-

manu-

of

the

position

Home

in

car-

directly

the

disk

This

the

Symptom Index

Problem

Figure

1-3.

address

the

1.

Disk
can
tracks,
disk
storage

three

are

a 2315
a

customer

must

selected

7. 2 Disk

defects

effect

because

cartridge.

capacities

spare

maintained

Disk

procedure
in

error,

The

procedure

1.

Starting

11100101

operation.

Sympton

Index

provide

information.

Formatting

on new

data

recording,

of

Using

tracks

for

Cartridge

utility

is

used

and

identify

to

be

with

~ead

must

Cause

of

Service

verification

Procedure

or

used

the

high

systems

based

to

ensure

the

life

is
program
to

locate

the

used

0,

be

written

Aids

2315

causing

density

should

on 200

that

of

the

used

in
employing
the

defects,
alternate
is

as

follows:

track

000,

and

C.

E.

of

the

Disk

loss

recording

therefore

data

tracks,

the

stated

cartridge.

a 2310

the

track

the

verified

M.

Reference

position

Cartridges

of

useable

of

program

allowing

capacities

Whenever

installation,

following

flag

the

locations.

pattern

by a read

of

the

tracks

1.6

2.

Then
verified

3.

If

successful,

be

continued.

itself

be

flagged and an

4.

To

ensure

use,

continuing with
tracks.
for

alternate

1.

7. 3 Error

The

IBM

provide

any
cedure
an

for a ten-retry

failure

must

automatic
established
ing a write
machine
defects,
to the
occur
should

read/write
this

alternate

at

this

stop
however,
without

error,

alternate

continue.

1.7.4

When
from

Homing

initializing

an unknown

cremented

the

pattern

again.

the

However,

ten

times

on

that

the

it

should

be

the

Use

spare
tracks.

Retry

Procedure

programming

of

access

be

used

track

flagging

in

the

file

operation.

malfunctions

formatting

track

new

alternate

and

request

the

recording

the

old

address

recorded

the

Carriage

the

location,

in

single

track

00010011

formatting

either

alternate

alternate

formatted

subsequent

tracks

systems
procedure

or

write.

for

read

procedure

programs

In

order

procedure

to

record

track,
attention
at

the

track

should

and

carriage

the

steps.

must

be

procedure

if

an

error

pattern,

track

track

immediately

disk

in

locations

supporting

to

be

A fifty

errors.

if

errors

to

protect

as

opposed to

should

this

data.

the

of

the

alternate

be

the

program

to

the

Home

carriage

By

testing

written

should

repeats

the

track

address

is

alright

before

cartridge

200-202

the

utilized

retry

pro-

In

addition,

must

be

occur

against

first

If

errors

procedure

C.

E.

track

flagged,

should

position

must

be

for

and

must

written.

for

2310,

on

dur-

its

skip

If,

occurs

the

de-

Home

after

when

Track
accomplished
move

the

carriage

direction

stop.
cation

1.7.5

A

sporadic
be
using

error
to

read a record
mean
trouble

1.

so

This

signal

Errors

increase

corrected

the

scheduled

during a customer

the

loss

is

pinpointed

Thoroughly
maintenance

the

Branch

to

read

2.

If

the

data
surface
and

an

imbedded

made

to

spot

with

Do

not

use

damage

3.

Temporary

but

make

damaged.

4.

If

all

else

the

affected

resort

to

each

step,

000

has

by

providing

that

carriage

will

present

to

the

and

by

cleaning

from

of

that

clean

procedure.

Office

the

data.

cannot

at

the

dislodge

lint-free

any

can

result.

replacement

certain

fails,

area

recover

the

program

been

reached.

an

203

tracks,

will

an

Access

using

system.

Data

Retrieval

in

random

the

maintenance

program,

the

file

data

to

in

the

head

the

heads

cleaning

be

read,

point

in

question

particle.

the

particle

tissue

other

method

that

the

it

may

be

on a

scope

the

data.

can

determine

This

can

access

heads

or

more

access

Home

errors

and

command

in a reverse

to

home

communi-

can

sometimes

disk

procedure. A solid

properly,

the

customer.

disk

using

Clean

fixture

examine

caused

area:

the

the

by

need

scheduled

disk

and

then

the

for a comet

An

by

and a

as

of

the

new

possible

trace

attempt

cleaning

serious

head

head

can

"scrubbing"

may

will

to

read

as

a final

be

to

and

cartridge

failure
not

If

the

using

try

disk

trail

be

the

tool.

disk

be

tried,

not

be

227

-5984

(9/65)

1.7

2.1

LEADING PARTICULARS

Maintenance
Drive
the

CE

istics

include

to

check

of

the

features

switches

and

machine

maintenance.

A CE

disk

cartridge
Engineer
and

for

radial

circumferential

ducer.

Special

level

to

properly

tools

are

service

ponents. A special

is

used

to

clean

read/write

A

Disk

Run Out

deflection

2.2

CE DISK CARTRIDGE

The

CE

disk

fied

by

its
tridges
has

disk.

tracking

timing
which
for

are

three

These

adjustment

adjustments

checks

future
purposes.
pre-recordings
is

made

for

use

of

tracks

be

used

by

Fixture

of

disk

surfaces

cartridge

red

access

white

all

pre-recorded

tracks

detent

use

and

Care

must

contained

protection

90

through

the

CE

for

applications.

The

alignment

plished

tracks.
track
track
The
all
heads

two

by

One of

100,
100

so

two

tracks

zeros

at a frequency

are

eccentric

using

CE

the

and

the

that

are

adjusted

tracks.

eccentricity

of

the

and

monitor

in a read

is

alignment

adjustment

available

the

Disk

Cartridge

is

(P

/N

door.

over.)

tracks

are

used

(track

(track

spacing

is

not

to

be

taken

of CE

110. Any

read/write

of

read/write

Track

tracks

other

is

written

of

to

read

(Section

mM

2310

controls

operating

select

used

by

of

read/write

of

at

machine

surfaces

used

to

0

2200001)

(Customer

The CE

on

for

100) and

095).

The

(track

be

used

not

on

these

tracks

100 which

is

written

written

is

built

with a

720

KC.

equal

amplitudes

4.

Disk

Storage

which

permit

character-

mode

during

the

Customer

heads,

the

sector

the

branch-office

and

Cleaning

of

measure

can

disk

each

its

the

disk.

vertical

be

disk

cartridge

side

of

trans-

com-

Fixture

identi-

car-

the

head-alignment

sector

105),
for

to

tracks.

by

other

index

third

track,

is

provided

maintenance

damage

the

Allowance

avoidirg

tracks

maintenance

heads

is

accom-

consists

outboard

inboard

into

clock

from

the

pattern

of two
from

track.

Read/write

of

17. 1)

the
may

of

the

The

index

track

095. A

recorded

.

positioned
delay

burst

index

2.3

A CE

(Figure
of
system,

located

come

between

is

disconnected.

on

of

30

for

an

pulse.

CE CONTROL

control

2-1)

the

disk

except

on

active

the

Disconnecting

a

Read

Select

circuit

erasing

2.4

Four
Head
switch,
provided

2.

The
so
from
the

and

recorded

CE SWITCHES

CE

switches

Select

and Step

on

4.

1 Head

Head

Select

that

the

either

two

heads
when aligning
has

two

positions,

with

the

upper

2.4.2
The

mode

Step Mode Switch

Step Mode

by

determining

CHAPTER 2 MAINTENANCE FEATURES

timing

burst

this

radially

(±5) fJ.sec

all-bits

of

track.

about

pattern

is

adjusted

bits

The

the

exists

and

an

sector

spindle

between

and

presentation

by

the

index

transducer

so
the

use

of CE

pulse

is

is

that a time

reference

of

the

PANEL

panel

is

provided

storage

for

the

panel

only when

using

mode.

recorded

located

drive

power

are

system

this

to

independent

input.

normally

the

CE

and

cable,

The CE

data

without

on

back

permit

Interlock

the

places

can

of

the

equipment

limited

operation

of the

The

CE

switches

inoperative

signal

disk

storage

the

machine

examine

the

possibility

using

and

the

cable
drive

read

of

information.

are

switch,

the

Select

CE

may

head.

is
heads

and

switch

Step Mode

Control

2310

Switch

switch

examine

This

in

use,

to
labeled
lower

provided

for

writing

controls

switch
and

a CE

controls

the

on

the

switch,

switch.

No

information.

the

selection

read

Signals

determines

is

particularly

cartridge.

0 and 1, which

read/write

distance

the

head.

actuator

to

be

CE

panel;

Direction

CE

control

originating

which of

The

correspond

traversed

is

of

heads

useful

switch

stepping

be-

in

by

227

-5984

(9/65)

2.1

Electronic
Gate

SW5

SW6

10

MIL

SW7

OUT

eee~

I 0

Head

"'.-

. '.' .

Select

..

20

Step

""."

MIL

Mode

.

IN

Direction

FRONT

SW8

CONT

I

Base

Plate

~

~~

~/

:~

CE

& Switches

Panel

Figure

2-1.

the

carriage

switch
which
by

the

the

Step

2.4.3

The

Direction

riage

motion

forward

ated.

OUT.
forward

Step

Control
causes
center
switch

2.2

CE

Panel

for

has

two

positions,

correspond

carriage

Control

Direction

switch

by

or

reverse

The

switch

The

In

position

toward

switch

the

carriage

of

the

data

is

actuated.

and

Switches

each

with

(10

or

switch

Switch

causing

direction

has

the

center

is

to

disk

step

of

labeled

the

distance

20

milli-inches)

is

actuated.

controls

the

carriage

two

positions

causes

of

actuated.

move,
each

time

the

actuator.

10

MIL and

to

the

direction

to

while

it

labeled

the

carriage

the

data

The Out

in

r~verse,

the

Step

be

displaced

each

move

is

being

disk

position

Control

The

20

time

of

in

IN and

to

move

when

away

MIL,

car-

a

actu-

the

from

2.4.4

Step

The

Step

providing

effect

movement

three

positions;

neutral.

correspond

movement.

When

step

movement,
tinuously
direction

tion

switch.

or

20

milli

of

the

Step Mode
stepping
cal

limits

Control

Control

an

access

Labeling

with

the

switch

at a 15
as

determined

The

-inch

cycle

until

of

travel

Switch

switch

of
continuous

the

the

ms

steps

switch.

drive

the

carriage.

on the

continuous

is

positioned

actuator

rate

actuator

as

the

carriage

where

initiates

by

carriage

pulse

to

access

This

step,

single

switch,

in a forward

steps

determined

The

the

is

the

actuator

detent

CaNT

or

single

for

caused

position

in

increments

strikes

motion

circuits

switch

step,

and SING,

stepping

a continuous

to

step

or

reverse

of

the

Direc-

by

the

position

continues

the

mechani-

continues

has
and

con-

of

to

by

to

10

this

operate

Control

without

switch

position.

When
movement,
time

the

switch
loaded
when

and 10

by

Mode

2.5

2.

To

the

so

released.

or

the

respective

switches.

TOOLS AND

5. 1 Standard

properly

foliowing

Small
SLT

CE

Oscilloscope,

with

The

following

is

the

switch

the

that

it

20

milli-inch

service

tools:

CE

Tool

Tool

Kit

Indicator

oscilloscope

carriage

removed

is

actuator

is

operated.

will

return

The

direction

positions

TEST

Tools

the

Kit

..•....

Unit

motion,

from

the

positioned

will

move

The

to

the
of

step

increment

of

the

EQUIPMENT

equipment,

........

(Not

Type

561S

.......

attachments

or

until

the

Continuous

for a single

one

step

switch

neutral

is

position

carriage

is

determined

Direction

the

CE

(PIN

available

(PIN

are

Step

step

step

each

spring

travel,

and Step

requires

451558)
9/65)

451647)

required:

Lint
SLT
Alcohol,

Pint

Head

Adapter

2.5.3
The

Branch

following

normally

can

be

obtained

CE

Disk

Cleaning

Disk

Cleaning

The

disk
cleaning
tridge.

and

The

inserts
cleaning
positioned

rotated

applied

is

used

manually
to

for

Free

Tissue

Board

Jumper

91%

Container

Alignment

•..••..•
Office

is a list

located

when

Cartridge.
Paddles

Fixture

cartridge

the

disk

operator

the

cartridge

pads

span

on

the

the

disk

unscheduled

. . . . .

Wires

Isopropyl,

. . . . .

Oscilloscope

Tools

of

tools

in

the

Branch

needed.

(PIN

clean~ng

while

it

is

unlatches

into

the

data
spindle.
while

cleaning

data

surfaces.

maintenance.

and

Office.

2200008)

fixture

encased

the

the

surfaces

The

spindle

solution

•

(PIN

•

(PIN

•

(PIN

•

(PiN

supplies

(PIN
(PiN

provides

within

cartridge

fixture

as

This

which

These

the

so

disk

can

be

is

fixture

2162567)

353796)

2155966)

2200052)

are

tools

2200001)

2108474)

for

car-

door

that

is

Plug-in
Plug-in

2.5. 2 Special

The

following

the

equipment

for

systems

Feeler

Gage,

(0.005

Feeler

Gage,

(0.007

Dual
Time

Tools

special

and

which

inch)

inch)

Trace

Base

and

Supplies

tools

are

are

available

use

the

disk

non-magnetic

.......

non-magnetic

.......

required

in

the

storage

.

.

. •

(P

IN

451648)

(P

IN

451651)

to

service

shipping

drive.

(PIN

2200007)

(PIN

2200057)

group

Disk

Run Out Gage

The

disk

to

determine

disk

by

measuring

tion

present

gage

is

mounted

the

head-arm
manually
adjustable
screw

on

to

determine

gage

are

-"Alternate
serial

number.;

run

out
the

at

the

assemblies,

rotated

lips

of

the

gage

runout.

described

procedures

00001

(PIN

2200050)*

gage

(Figure

extent

of

warpage

the

amount

outer

edge

on

the

base

between

the

the

gage. A knurled

permits

Procedures

in

Chapter

ar~

contallled

throu<:h

00050.

2-2)

of

vertical

of

the

plate,

so

that

gap

established

adjusting

for

4 •

III

Chapter

enables
present

disk.

adjacent

the

disk

adjusting

the

gap

using

7 for

the
in

a

deflec-

This

to

can

by

size

the

machines

CE

be

with

727

-!)<)H-!

(!J/I;:;)

2.3

Stationary

Lip

Figure

2-2.

Disk Run Out Gage

Adjustable

Lip

Gage

Lips

~

'------

.......

____

Height

Adjustment

Screw

2.4

CHAPTER 3 SCHEDULED PREVENTIVE MAINTENANCE PROCEDURES

3.1

APPROACH TO SCHEDULED PREVENTIVE

MAINTENANCE

The

prime

objective

provide

to~er.

should
preventive
time,

3.

Visual
tive
rOSion,
nections
notiCing
time

maximum

Ev~ry

assist

in

maintenance

it

is

unnecessary.

1.

1 Visual Inspection

inspection

maintenance

dirt,

wear,

in

wiring

these

later.

3.1. 2 Electronic

Diagnostic

basic
tronic
potential

also

3.

1. 3 Mechanical Units

The

formed
machine
ber,
maintenance

programs

tools

used

circuits.

and

excellent

three

basic

on

every

are

do not do

intermittent

clean,

on equipment

of any

maintenance

machine

preventive

realizing

availability

maintenance

this

operation

is

the

first

operation.

cracks,

and on

items

may

hardware.
minimize

Circuits

and

pulse

in

preventive

All of

these

troubles.

troubleshooting

preventive

maintenance

mechanical

lubricate,

more

than

recommended

that

objective.

cuts

step

to

every

Always look

binds,

and

machine down

checking

maintenance

are

effective

These

tools.

or

electromechanical

and

inspect.

is

operating

factorily.

3.1. 4 Cleanliness

Cleanliness
the

mM

When

prOximately 125

heads

the
particles
between
dust

can

and

this

in

head

Do not allow oil

machine.

cannot

2310

Disk

the

heads

and

the

of

dust

the

heads

cause

condition

damage.

Oil

accumulates

Storage

to

surfaces

can

and

the

disk

can

be

overemphasized

Drive.

are

"flying" a

150

microinches

of

the

accumulate

the

disk~

surface

result

in

to

accumulate

dust

clearance

exists

disk.

and

become

The

accumulated

to

become

an

unusaple

anywhere on

and

dirt.

ability

to

the

operation

Unless a

machine

preven-

for

loose

Alertness

are

the

of

in

locating

items

steps

Remem-·

preventive

satis-

in

maintairiing

of

between

Vepy

small

trapped

'scored,

track

Do not

is

cus-

down-

cor-

con-

in

elec-

per-

ap-

the

to

two

are

or

operate

~ess

ner.

replace
avoid

3.2

,Details of
listed

tenance,
chart
2310 Disk
is
Details

in

safety

3.2.1

1.

2. Use a

.

WARNING:
head

and
the
ture

3.2.2

Scheduled
described
cants
contained

the

analysis

If

the
customer's

damage

machine

cannot

machine

to

customer

with

the

be

performed

must

run

cartridge

data.

top

cover

in

with

the

with a CE

SCHEDULED MAINTENANCE PROCEDURES

in

for

defined

on

the

Operation

scheduled

Figure

perform

that

particular

Storage

by

its

adjustments

maintenance

3-1.

During

only

those

Drive

time

interval

and

column of

operations

normal

operations
maintenance
scheduled

service

Figure

maintenance

of

use

checks

3-1.

practices.

Cleaning

Wrap a
paddle and

(PIN

NOTE:
four

to

write
read/write
with alcohol. Use

the

head
cleaned
not

cleaned

wipe head with

With

ruin a head.

read/write

'will

rust

Lubrication

are

Read/Write

lint-free

dampen

2155966)

Paddle

five

times

second

head,

paddle

and thoroughly wipe the

head with

surface.

off. Any

off

Do

not

fingers.

Do not

head.

and

contaminate

lubrication
in

Figures

to

be

applied

in

these

charts.

Heads

wiper

(P

with

91%

is

made

by

lengthwise.

to

support

the

the

dental

Be

very

extraneous

will

damage

dry

wiper.

touch

the

face

Acids

emitted

leave

Do

not blow on

of Machine

requirements

3-1

and

according

/N

2162567)

isopropyl

folding

lint-free

mirror

careful

material

the

of

from

any

residue

the

heads.

for

3-2.

Specified

to

the

disks.

the

instructions

.

removed

any

other

cover

cartridge

scheduled

listed

period.

by

the

customer.

are

Observe

around

alcohol

an

mM

back

of a

face

wiper

dampened

to

inspect

that

all

which

Finally,

read/write

skin

can

on

heads.

the

2310

lubri-

man-

off,

are

main-

on

The

period

found

card

of

each

dirt

etch

face

Mois-

are

un-

to

the

all

a

read!

is

is

of

227-5984

(9/65)

3.1

conE

U R

3

5

LOCATION

OPERATION
Read/Write

Carriage

Preload Bearing

Deh;!nt Rack

Spindle Assemblt
(Magnetic

Air
Electronics Duct

Head Load Cam

Head Load
Spring Support
Pivots

Spindle
Center

Drive
and
Motor Flux

Base
Casting
Covers

Air
Plenum Chamber

Drive Belt
Tension

**Drive Motor

Read/write

Sector Pulse

Timing

Filter

Magnet

Voice

Plate

Filter

rail

Cone

and

Heads

Chuc

Coil

Gop

heads

)

*FREQ

4

12

OPERATION

Clean;

Inspect:

Clean

and

inspect

af

axide.

Inspect

head

Clean;

Lubricate:

Clean

carriage
Apply a thin film of
tissue.
Clean:
Clean

outer

tissue against it while moving
Clean;

Lubricate:

Clean

detent

of

IBM

#9

Access

the

times.

Wipe excess

Clean:
Clean

each

dampened with 91% lospropyl
Replace

Filter.

Disconnect
screw on
remove

' Lubricate:

Apply a
surface.

Apply
Support Pivots.

Apply a light film of
any excess

top

air

I ight film of

Lubricate:

one

Lubricate:

Inspect;

Clean

Remove

actuator
especially
piece

of masking

each

wipe
Clean

the

Inspect;

Clean:

Inspect for cleanliness and loose parts.

Test; Replace if necessary:
Test plenum chamber
air

fi

Iter if necessary.

Check;

Adjust
Loosen

three
to position
screws progressively

Lubricate:
Apply

IBM

Check:
Check

read/write

according
Check:

Check

sector pulse timing using

to procedures of Section

read/write

See Section

leads for

rail with

race

of

the

Rack with

Oil

in

three

carriage

fram

ail

pole

piece

head

plug leads from heads

of

electronics

filter from

drop of

IBM

grease.

if necessary:

motor (Drive Magnet)

for metal

tape

side of flux

voice

coil with dry

motor mounting screws

the

motor to

#6

oil to fill oil cups on

head

to

procedures of

heads for scratches

3.3.2.
damage.

lint-free

IBM

Preload Bearing by holding a dry

IBM

equally_spaced places an the

from

of

left

IBM

±9 oil

IBM

particles.

on a

gap.

air

obtain

to

prevent changing

alignment using

tissue

#6

oil.

Remove excess with

the

carriage

Brush

track

000

detent

the

Magnetic

Alcohol.

gate.

side, of

gate.

#22 grease on wear points of Head Laad Cam

at

four points

#22 grease on cone

If

paddle

lint-free

flow as

outlined

the

Sect

ian

CE

4.20.1

and

build

up

and

91% Isopropyl

back

and

(P/N·1018992).'

to

199

and

rack.

Swing

cleaning

with adhesive side exposed, and

and

required

each

4.17.1

disk

back

Chuck

with

and

loosen binding

gate

door downward

of

Head Load Spring

surface.

and

inspect for contamination;
is

necessary,

tissue.

Clean

as necessary.

in

Section

allow

the

belt

tension.

the

position of

end

of motor

CE

disk

Cartridge

Cartridge

lint-free

forth.

Place

rack.

three

lint-free

Wipe off

place

4.3.1.

belt

tension spring

the

shaft.

track

095

alcahol.

lint-free

one

drop

'

or four

tissue

head

and

a

Replace

Tighten

plate,

track

according

the

100

* The

preventive

**

Lubric~tian

Figure 3 -1.

maintenance

is

ta

Preventive

Frequency

be

accamplished on

Maintenance

is

determined by machine usage rates computed

50-cycle,

Schedule

3.2

208/220-volt

motors

only.

at

176 hrs-per-month an a single shift basi

8 Carriage

Use
(thin film)

f2'Detent
VUse

(1

Rail

IBM

#6

ail

Rack

IBM

#9

drop in 3 equally spaced places)

ail

o Head

f4\ Head

VUse

f'5\Spindle

V

16\50

V

Figure

227-5984

load
Use
(thin film)

(one drop

Use

(thin film)

Fi

(Applicable for 50 cps, 220 volt drive motors only)

3-2.

Cam

IBM

#22 grease

load

Spring Support Pivots

IBM

#9

oil

in

Center Cone

IBM

#22 grease

CPS

Drive Motor

II

cups on

each

Lubrication

(9/65)

4 locations)

end of shoft with

Chart

IBM

'6

oi I

3.3

Motor
Mounting

Plate~---

Motor
Mounting
Screw

(3)

Belt Tension Drive Motor

Pulley

Flat Drive

Belt

Figure 3 -3.

3.2.3

Drive

structions

adjusting

3.3

Drive

belt

HEAD

Drive

tension
contained

screws

AND

DESCRIPTION

3.3.1

Head

particle

surface
on
disk

an

is

Particle

and

disk

of

of a

air

bearing

rotating.

foreign

disk.

When a particle

the

head

and

face

of

the

disk.

this

and

subsequent
bedded
the

embed

on

particle

particle.

Harder

in

the

disk

materials,

the

will

Belt

Adjustment

Belt

Tension

is

is

Adjustment

to

be

adjusted

in

Figure

contained

3-1.

in

Figure

according

DISK CARTRIDGE SCRATCH

Damage

damage

disk,

depends

disk

mark

to

Disk

can

be

caused

matter

The

of 125

it

The

gliding

to

is

carried

may

damage

passes

on

such

being

150

be

embedded

which

of

the

the

as

deposited

shoe

of

microinches

into

the

results

head

material

aluminum

surface. A comet-trail

the

path

of

some

The

location

3-3.

by a small

onto

the

head

while

gap

between

into

the

from

over

the

and

size

oxide,

scratch

particles.

to

in-

the

"flies"

sur-

em-

of

the

of

may

3.3.2

A
may

write

Particle

la,rge,

cut a groove

head.
and a head
area

of

the

a

succession

its

face.

or

be

pounded

not

necessarily

machine.

When

burr

may

be

partially
trusion
height,

3.3.3

Damage
result
erally
the
tion
head

on
it

Non-Particle

to
of
covered

surface

in

shoe

"flight",

Damage

hard

particle

in

The

disk

being

addressed

embedded

of

0.010

Eventually,

below

below

the

surface

be

formed

embedded

the

gliding

will

scratch

both

head

head-to-disk

by

considering

of

either

curvature

will

result

to

Head

embedded

the

face

data

tracks

to

particle

inch

grooves

this

particle

the

flight

that

of a

of a

head

on

the

head,

in

the

shoe

is

the

disk

Damage

and

disk

interference.

head

or

that

will

in

interference.

(Figure

in

of

the

different
will

height

head

the

shoe

are

soon

or

could

on

3-4)

disk

on

0.010
tracks

be

scratches

be

(of

this

another

etched

contacts a particle,

or

the

particle

head

epoxy.

greater

than

If

the

surface.

surfaces

that

disk,

interfere

can

This

can

imperfections,

or

any

imperfec-

with

surface

the

read/

inch

apart

in

the

with

across

dislodged

head)

may

this

pro-

flight

occur

as

be

gen-

on

proper

but

a

a

3.4

Typical

be

fingerprints

head

or

disk,

propyl

Alcohol,

atmosphere.

Presence

head

or

disk

salts

which,

build

up to a

the

head.

interference.

A continuous

on

the

head

write

errors

not

followed.

3.3.

4 Disk

examples

or

residue

lint,

of

fingerprints,
surface
in

most

height

This

condition

surfaces

if

scheduled

Cartridge

of

surface

other

stains

resulting

and

dust

means a deposit
cases,

greater

will

than

can

accumulation

may

result
maintenance

and

Read/Write

imperfection

on

the

surface

from

misuse

would

of a

of

Iso-

from a contaminated

films,

result

cause

the

flight

of

foreign

in

generating

or

stains

of

oils

deposits

height

in

head-to-disk

material

activity

Head

Damage

on a

and

to

read/

is

of

A

Series

(Figure

If

across
disk
may
grooves
Heads

a

head

surface
not

3-4)

the

still
does

become
damaged
fly with

Oxide
The

makes
that
to

an

Deposit

distinctive

it

oxide

disk

interference.

preventive

of

Scratches

has a series

face

of

the

with

an

be

present.

not

necessarily

scratched

head

will

not

audible

tingling.

on Heads

color

fairly

easy

is

being

scraped

maintenance

or

Grooves

of

0.010

shoe,

it

embedded

The

during

read

data

of

the

reddish

to

detect.

off a

Heads

should

procedures

Across

inch

has

been

particle

presence

Head

spaced

flown on a

which

of

mean a ruined

normal

use

properly,

brown

Its

presence

disk

surface

be

cleaned

..

grooves

mayor

these

head.

but

a

or

it

will

oxide

may

by

using

mean

head

Scratches

Some

types
tically
age
typical

harmless

to

equipment.

comet

embedded

Some
Scratches
apart

indicate a head

with a

protrusion

particle

on

of

particle
types
which

in

the

Disk

Surfaces

scratches

while

One

trail

where

protruding

of

scratches

are

on

head

on

other

type

the

regularly

had

been

its

shoe

pole

epoxy.

disk

types

of

harmful

head

out of

indicate

spaced

used

face,

surfaces

can

result

of

the

the

other

0.010

on

that

or

an

are

prac-

in

scratch

comet

surface.

problems.

inch

surface

embedded

dam­is
is

a
an

Audible

Tingling

An audible
tion

of

head

tial

symptom

dislodged

or

Examine

and

comet

of the

embedded

the

track

pOSitions of
occurred.
area

should

maintenance

from

tingling

to

disk

and

may

is

smashed

the

heads

trails.

particle

The

head:

be

thoroughly

procedures.

Head and

or

scratching

interference.

not

continue

flat.

and

disk

The

approximate

can

be

the

carriage

cartridge,

cleaned

Disk

Interference

sound

is

This

can

if

the

particle

surface

for

radial

determined

where

the

and

spindle

using

scheduled

an

indica-

be

an

scratches

position

by

noting

tingling

ini­is

227

-5984

(9/65)

3.5

ROTATION

......

•

ROTATION.

,-( 1 .

•

QS4IIIIIP

Scratch and oxide build-up due to scratches.
Replace head-arm assembly.

ROTATION.

Alcohol Residue. Clean gliding surface with
91%

isopropyl alcohol. However never allow

to dry

in

alcohol

areas are fonned.
lint-free tissue and a gentle wiping motion.

small pools such that residue

Remove

alcohol, using

..

~

Oxide has accumulated

Replace head-arm assembly.

Finger prints and other oi I like stains.
form

an

excellent

transferred to the gliding surface. Complete

removal

of

this contaminate

to resuming

file operation.

means

in

the pole tip

by

which oxide

is

mandatory prior

area.

ROTATION.

These

may

be

ROTATION.

Slight scratches without oxide build-up.
Head-ann assembly

Figure 3

-4.

3.6

may

be

used.

Inspection of Read/Write Heads

ROTATION.

Slight oxide build-up. Clean with 91% isopropyl
alcohol.

Head-arm assembly

may

be used.

4.0

INDEX

CHAPTER

OF

SERVICE CHECKS, ADJUSTMENTS

4 SERVICE CHECKS, ADJUSTMENTS,

AND

REMOVALS

AND

REMOVAL PROCEDURES

Component

Actuator
Blower
Blower
Blower
Blower

Assembly
Motor
Scroll
Wheel

Carriage

Bearing
Carriage
Carriage
Cartridge

Cartridge

Switch
Cartridge
Crash

Stop,

Crash

Stop,

Data

Separator
Detent
Detent
Disk
Drive
Drive
Drive
Drive
Head

Assembly
Rack

Runout

Belt
Coil

Magnet

Motor

Arm

Head Load

Assembly

Preload

Rail
Subassembly

Assembly

In

Place

Receiver

Front

Rear

Assembly

Assembly

Service

Checks

Figure

Figure

Section

Figure
Section
Figure

Figure

3-1

3-1

4.2.1,

4.2.2

3-1

4.2.3

3-1

3-1

Cleaning

Figure

Figure

Figure

3-1

3-1

3-1

Adjustment

Section

Section

Section
Section
Section
Section
Section
Section

Section

Section
Section

4.5.

4.

18.

4.18.2

4.10.1

4.10.2

4.21.1

4.7.2

4.7.4

3.2.3

4.

17.

4.8.2

Removal!

Replacement

2

3

1

Section
Section
Section
Section
Section

Section
Section
Section
Section

Section

Section
Section

Section
Section
Section
Section
Section

4.5.1

4. 4.

4.4.4

4.4.3

4.4.2

4.14.1

4.

13.

4.15.1

4.2.3

4.18.1

4.7.1

4.7.3

4.1.1

4.6.2

4.6.1

4.1.

2

4.17.2

1

I

1

Head

Load

Spring

Assembly

Head

Load

Solenoid

Heads

Loaded

Switch

Home Switch

227

-5984

(9/65)

Figure

3-1

Section
Section

4.8.3

4.11.

Section

Section

Section

2

Section

4.9.1

.4.8.1

4.8.3

4.11.1

4.

1

INDEX OF SERVICE CHECKS, ADJUSTMENTS

AND

REMOVALS (Continued)

Interlock
Plenum

Plenum
Read/Write

Sector
Spindle
Tachometer

Tachometer

Rod

4.1

DRIVE MOTOR

4.1.1

1.

Drive

Loosen

motor

2.

Push
until

3.

Replace

4.

Adjust
cedures

4. 1. 2

1.

Drive

Disconnect

power

2.

Remove

3.

Remove
motor
motor.

4.

Replace
and

3.

4.

1.

3 Spindle

1.

Remove

2.

Remove

securing
(Figure
provided

in

bottom

assembly.

3.

Lift the spindle
bore.

Component

Handle

Air

Filter

Cover

Heads

Transducer

Assembly

Assembly

Extension

Belt

Removal and

three

hex-head

mounting

drive

motor

drive

belt

drive

the

drive

of Section

Motor

leads

box.

drive
four

socket-head

to

motor

drive

Adjust

Assembly

drive
three

spindle

4-1).

through

of

outer

AND

DRIVE

mounting

plate

to

base

mounting

slips

off

the

belt

by

reversing

belt

tension

3.2.3.

Removal

from

terminal

belt.

See Section

mounting

motor

by

reversing

drive

belt

Removal

belt.

See Section

socket-head

housing

Access

two

pole

to

holes

piece

vertically

Service

Checks

Figure
Section

Figure
Section

Figure

BELT

Replacement

screws

plate.

plate

horizontally

pulleys.

Steps 1 and

by

following

and

Replacement

strip

4.1.1.

screws

plate

securing

and

tension,

and

4.1.1.

mounting

to

base

plate

mounting

(180°

apart)

of

magnetic

out

of

its

3-1

4.

3.

1

3-1

4.16.1

3-1

securing

2.

pro-

in

ac

drive

remove

steps

Section

1,

3.2.3.

drive

2,

Replacement

screws

screws

is

located

chuck

locating

Cleaning

Figure
Section

3-1

3.2.1

WARNING: A
housing and
the

base-plate

spindle

4.

Replace
2,

WARNING: Tighten
evenly

5.

Adjust

track

4.17.1.

4.2

CARTRIDGE ASSEMBLY

4.2.1

Scratches
related

symptoms
cause

of

1.

Check
tion

2.

Check
head.

3.

Check
Section

4.

Check
disk

Section

Section

Section

Section

close

base

since

can

be

destroyed

spindle

and

3.

or

spindle

head-arm

100 on CE

9!lrtridge

on

heads

as

described
should

read/write

for

scratches

3.3.4

and

for a series

See

for

oxide

3.3.4

for

audible tinging

interference.

Adjustment

4.

19.

4.17.

4.20.1

4.

12.

fit

exists

plate.

the

Do

accurate

if

assembly

the

three

alignment

assemblies

disk

Service

and/or

in

Section

be

investigated

problems:

on

Figure

of

section

3.3.4

deposited

and

Figure

See Section

Removal!

Replacement

1 Section

Section

Section

1

Section

Section
Section
Section

2

Section

between

not

pry

the

location

this

is

done.

by

reversing

mounting

will

be

destroyed.

by

alignment

cartridge.

See

Check

disk

data

surface

3.3.

The

to

determine

disk

surfaces.

3-4.

scratches

and

on

3-4.

or

Figure

heads.

resulting

3.3.4.

4.

4.3.2

4.3.

4.

4.20.2

4.1.

4.

4.12.1

the

spindle

spindle

of

screws

Section

following

grooves

3-4.

See

from

19.

1

2

17.2

3

12.

3

off of

the

Steps 1,

with

are

the

See

sec-

across

head

and

4.2

Outer

Magnetic

Chuck Assembly Spindle Cone

Access hole

Mounting Screw

Spindle Assembly
Mounting Screw

Figure

4.2.2

Examine
trails.
bedded

track

for

4-1.

Magnetic

Visual

the

The

particle

positions

occurred.
thoroughly

cleaned

procedures.

the

Branch

of

the

disk

is

and

is

not

scheduled

Exercise
cles

into

care

the

surfaces.

4.2.3

Disk

Spindle

(2)

(3\---~~

Check

and

Spindle Assembly

Inspection

disk

surfaces

approximate

can

be

of

the

The

head

using

Also,

the

Office

disk

accomplished

to

prevent

cartridge

for

radial

determined

carriage

and

the
scheduled

disk

cleaning

for

as

preventive

introducing

while

scratches

position

by

where

shroud

should

fixture.

remedial

maintenance.)

inspecting

Height and Run Out Check

and

comet

of

the

noting

the

the

tinging

area

should

maintenance

be

cleaned

(Cleaning

purposes,

foreign

the

parti-

disk

em-

be

using

can

be

manually

by

adjustable

screw

on
determine
check

for

1.

Remove

2.

Remove

3.

Remove

4.

Remove

5.

Remove

6.

Remove

lips

the

gage

runout.

runout

power

cartridge
top
the

the

the

bracket.

WARNING: Avoid
plenum
items

through

in

this

the

area

rotated

of

the

permits

Procedure

is

as

from

cover.
disk

guide

air

deflector.

door

opener

dropping

cored

can

cause

between

the

gage. A knurled

adjusting

for

accomplishing

follows:

the

machine.

from

machine.

(Figure

6-1).

along with

screws

hole

in

or

the

damage

gap

established

adjusting

the

gap

its

spacers
casting.
to

the

size

to
a

mounting

into

Loose

machine.

the

The

disk

height

and

run

out

check

determine

allowable

2200050)
gage
jacent

227-5984

if

limits.

is

(Figure

to

the

(9/65)

the

used

2-2)

head

amount

The

Disk

to

accomplish

is

mounted

ariD

assemblies,

of

warpage

Run Out Gage

on

is

this

the

performed

in a disk

(PIN

check.

base

plate

so

that

the

to

exceeds

This

ad-

disk

7.

S.

Position
in

the

guide.

for

mounting
Insert
After

pushing

the

disk

space

previously

Use

the

the

cartridge

run

tapped

gage.

partially

it

two-thirds

out

gage

occupied

hole

into

on

closest

the

of

the

the

base

by

the

to

the

receiver.

way,

plate,

disk

spindle

open

the

4.3

door

manually

tridge

carefully

slides

properly

heads

and

in

9.

After

the

cartridge
position
lower
of
tridge

the

the

gage-base,

by

and

cartridge

operating

WARNING: Avoid
disk

through

cause

dure

that

10.

Turn
carefully
on
readjust
adjusting
and
the
disk

11.

After
carefully
runout
and
the

4.2.4

Replacement
any

of

1.

The

2. A surface
and

3.

An
is
cannot

4.3

PLENUM

4.3.1

1.

Prepare a test
a.

gage.

damage:

follows.

the

the

gage

its

runout

spindle

surface

the

gage.

air

deflector

top

cover

Disk

Cartridge

these

conditions

cartridge

is

causing

embedded

present

be

Plenum

Fold

Be

spindle

to

lip.

the

screw.

can

checking

remove

of a

of

on a

dislodged

Am

Filter

an
columns
thick.

b.

Tear

off and

and

continue

while

between

the

mouth

is

touches

door

and

the

scratching

Any

scratching

particularly

pulley

determine

If

any

disk

run

The

is

within

be

turned

touching

procedure

the

Replace

first,

last.

Replacement

disk

cartridge

exist:

has

sustained

the

disk

read/write

particle

disk

by

FILTER

Air

gage

as

IBM

card

20 and 60

discard

observing

the

of

the

pushed

the

two

upon

carefully

handle.

the

slowly

that

contact

out

gage

disk

permissible

one

gage

lips.

cartridge,

the

door

then

is

scratched

errors.

or

surface

surface

cleaning.

Flow

Test

follows:

at

column

so

that

one

inserting

that

two

read/write
gage.
to

the

foremost

cartridge

the

upper

lower

disk

while

of

the

careful

disk

by

does

in

hand.

noise

by

turning

is

in

proper

revolution

is

completed,

then

opener

the

disk

Conditions

is

necessary

mechanical

or

contamination

and

the

40

and

card

is

layer.

the

car-

the

disk

stops,

side

the

car-

revolving

disk

will

the

proce-

Listen

not·

touch

is

heard,

the

height

limits, . if

without

the

disk

bracket

guide,

when

damage.

gouged

particle

again

four

layers

and

at

c.

Use

transparent

that

card

2.

3.

4.3.2

Verify
is
Place
duct
handle.
the

If

the
does

that

removed.

test

which

If

plenum

it

blows

air

flow

not

require

Plenum

blower

gage

is
test

filter

off

Air

WARNING: When

certain
filter
position,
particles
the
tissue

1. Remove

2.

3.

4.4

4.4. 1 Blower

1.

2.

3.

that

the

foam

and

baseplate.

leaks

can

to

be

blown into

plenum

cover

dampened

plenum
mounting
The
Replace

air

nut

filter

air

BLOWER ASSEMBLY

Assembly

Turn

off

all

Disconnect

strip

Remove

securing

blower

located

four

blower

baseplate.

forward

1/2

gate.

4.

The

blower

from

baseplate.

5.

4.4.2

1.

2.

Replace

2,

Remove
which

Loosen
shaft

3,

and

Blower

is

set

and

blower

4.

Wheel

face-plate

secured

screw

slide

tape

will

remain

is

operating

over

that

nearest

or

is

sufficient

gage

is

will

the

remains

clogged

not

replacement.

Filter

Removal

replacing

rubber

If

this

result

which

the

and

cartridge

with

91%

Isopropyl

cover

which

also

can

be

dropped

filter

by

reversing

Removal

power

to

machine.

motor

in

ac

box.

binding-head

motor

The

blower

inch

for

duct

may

now

be

assembly

Removal

at

inlet

by

three

securing

wheel out

to

secure

flat

half
disk

in

and

remain

and

the

plenum

seal

is

seal

is

will

cartridge.

air

by

removing

secures

leads

mounting

mounting

assembly

to

clear

lowered

by

reversing

and

to

blower

screws.

blower

inlet

edges

in

folded

position.

and

disk

of

the

air

valve

cartridge

this

position,

must

be

where

placed,

plenum

and

air

filter

Replacement*

filter,

between

not

in

its

allow

foreign

Also

duct

with

Alcohol.

single

the

filter.

vertically

Steps

and

from

downward.

1,

Replacement*

terminal

screws

bracket

must

be

electronic

vertically

Steps

Replacement

assembly

wheel

to

blower

so

cartridge

receiver

replaced.

make

the

air

proper

clean

lint-free

and

2.

to

moved

away

1,

to

motor

scroll.

4.4

*Altemate

serial

numbers

procedures

11'",

00001 through 00050.

contained

in

Chapter

7 for

machines

with

3.

Replace
and 2.

4.4.3

1.

Remove

2.

Remove
scroll
mounting

3.

Replace

and 2.

4.4.4

1.

Remove

2.

Remove

3.

Remove
and two
motor

4.

Replace
and

4.5

ACTUATOR ASSEMBLY

4.5.1

The

entire

bly

may

1.

Shut off
cartridge.

2.

Remove

3.

Disconnect
tacles
cable

4.

Unsolder
with a

tate

5.

Remove
and note
removed.
and note
moved.

6. Remove
load
plunger.

7.

Disconnect
door

between

guide

blower

Blower

Blower

Actuator

(Figure

Scroll

blower
four

securing

bracket.

blower

Motor

blower
blower
two

binding-head

nuts

mounting

blower

3.

Assembly

4-2)*

carriage

be

removed

all

power

cartridge

read/write

and

remove

receptacles.

home

different

identification.

tachometer

terminal

Unsolder

terminal

retaining

solenoid

the

opener

and

actuator

located

binding-head

securing

wheel

by

Removal

wheel

(Refer

blower

scroll

Removal

wheel

(Refer

scroll

blower

bracket.

motor

Removal

and mount of

as

a unit

to

the

receiver

the

switch

colored

leads

from

leads

from

ring

plunger

adjacent

spring

remove

and

and

attached

shroud.

to

reversing

and

screws

scroll

by

reversing

and

(Refer

screws,

by

reversing

as

machine

head

clamp

leads

grease

from

which

from

which

from

slide

the

the

steps

Replacement

to

Section

on

to

blower

steps

Replacement*

to

Section

to

Section

two

motor

to

steps

and

Replacement

the

actuator

follows:

and

remove

(See

Section

cables

which

and

mark

pencil

terminal

each

the

each

Pivot

pin

pivot

to

the

air

baffle

Remove

actuator

from

secures

lead

voice

lead

pin

cartridge

1

4.4.2).

inside

of

motor

1

4.4.2).

4.4.3).

clamps,

blower

1,

2,

assem-

4.18.1).
recep-

the

each

lead

to

facili-

strip

is

coil

is

re-

in

head-

out

of

mounted

the

disk

assembly.

8.

Remove

screws

the

baseplate.

9.

Lift

carriage
two dowel
with
to

the

CA

UTION:

to

terminals

I

coil

after

these

leads

motion

Replace

10.
through
readjust

4.5.2

Four
circuits
shows
these

tachometer
detent
directions.

minimize

decelerated

adjustment
celerating
for a single
is

justment
seat
a new

WARNING:
to avoid

plifier

Tachometer

1.

Access

adjustments

to

the

adjustments.

A

static

operation

An

amplifier

A 10

made

for

A 10

provides

in

the

track

shorting

and

Apply
the

tachometer

between

2k-ohm

(Figure

the

five

which

secure

drive

pins

the

tachometer

actuator

Ensure

on

,the

replacing

would

resulting

actuator

8.

Check

if

necessary

Adjustments

are

maintain

location

is

carriage

to

milli-inch

is

and

step
each

millisecond

rack

location.

Use

Access

power

of

and

dynamic

accomplished

will

dead

oscillations

arrive

made

stopping

increment. A separate

stepping

for

after

Alignment

adjacent

Logic

Static

Balance

to

pins

F2B12 and F2D11
Tachometer
4-3)

located

slotted

in

assembly.

that
tachometer

cause

in

damage

assembly

carriage

potentiometers

occur

at

and 20

to

single

timing

carriage

machine
amplifier

hex-head

the

actuator

assembly

carriage

assembly

correct

the

actuator.

uncontrolled

to

head

load

(See

accomplished

positioning.

balance

to

for

band

adjustment

a new

milli-inch

calibrate

carriage

mode.

shot

of

Screwdriver

contacts

SLT

cards.

Adjustment

and

output

Balance
on

the

mounting

assembly

vertically

mounting

which

leads

assembly

Reversal

carriage

equipment

by

reversing

adjustment

Section

ensure
carriage

when

track

the

the

has

Access

4.8.2).

in

the

involved

adjustment

that

is

the

location.

integrator-set

trip

motion

(Access

detent

been

to

the

statically

voltage

by

adjusting

potentiometer

Amplifier

off

the

base

along

is

attached

are

matched

and

voice

of

•.

steps

and

access

Figure

for

of

the

smooth

travel

in

made

to

carriage

level

for

within

limits

adjustment

Ready)

to

correctly

accessed

(P/N

460811)

Access

balance

measured

the

to

2

logic

4-3

both

is

de-

ad-

to

Am-

card.

*Altemate

serial numbers 00001 through 00050,

227

-5984

procedures

(9/65)

are

contained

in

Chapter

7 for

machines

with

4.5

DRIVE

MAGNET

CLIP

'--,

DRIVE

MAGNET

CLlP~

........

,

"

........

,

........

........

HOME

SWITCH

ADJUST

SCREW

------',

HOME

SWITCH

NUT

PLATE

DETENT

ASSEMBLY

Figure

4-2.

Actuator

Assembly, Exploded View

CARRIAGE

CARRIAGE

RAI

L

DETENT

RACK

I

.)

,/

/'

HOME

SWITCH

ACTUATOR

/

/

MOUNTING

BASE

\VOICE

COIL

ASSEMBLY

\

~

IiEAD

LOAD

sPmNG

ASSEMBLY

~

~~ , ~PIVOT

""-~ -,

111

/

.,..

- /

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

>.

TACHOMETER

MAGNET

CLAMP

o;..,L~-

DOOR

OPENER

100

Ohm

Dead.Band

Adjustment

Level

100

Ohm
20Mil
I

ntegrator

Adjustment

Set

2K

Ohm
Tachometer
Adjustment

Balance

2K

Ohm

10Mii

I

ntegrator

Adjustment

Set

Access

Logic

Card

(G

Soc

Figure

4-3.

2.

Adjust

across
condition.

3.

Measure
ground
step 2 above.

+0. 65 vdc

Dead

Band

1.

Monitor
eter

2.

Adjust
fier
potentiometer
of

the
become
narrowed,

ket)

Access

the

potentiometer

pins

the

under

maximum

Adjustment

wiper

on

pin

the

dead

by

using

dead

band.

more

causing

Adjustment,

F2Bl2

voltage

the

same

This

voltage

F2D13.

band

the

100-ohm

(Figure

The

positive

---

---

Potentiometer

and

F2Dll

from

balanced

voltage

and

-0.

of

in

the

4-3)

voltage

as

the

actuator

---

---

---

Locations

to

obtain a zero

for a balanced

F2Bl2

or

conditions

should

85

vdc

the

dead

band

power

driver

level,

Dead

to

narrow

on

F2Dl3

the

dead

to

---

----

----

voltage

F2Dll

be

within

minimum.

potentiom-

ampli-

Band

the

width

will

band

is

oscillate.

to

of

---

----

---

---------

----

---

---

-------

---

----

NOTE: On
so
frequencies
condition

by

3.

4.

I

---

---

----

--

- J

---

some

high

that

the
higher

may

be

the

frequency

Narrow
to
(decrease

Continue
two
tions

the

OScillate,

voltage)

to

full

turns

cease.

CAUTION: An

IOO-ohm
ted
justment
whenever

to

the

level,

extreme

screw

this

H

I

K

L

M

N

systems,

actuator

than

detected

generated

dead

band

and

then

widen

of

the

audible

Dead

wiper-end

must

point

is

the

amplifier

will

begin

200

cycles

audibly

by

the

until

the

widen

until

oscillations

the

dead

band

potentiometer

"click"

Band

potentiometer

position.

be

backed

reached.

--.

20K

Ohm

10ms

Single

Adjustment

to

oscillate

per

second.

by a whine

voice-coil

actuator

the

dead

by

an

after

is

heard

off two

If

the

Timing

Cycle

Shot

gain

will

at

This

caused

motor.

begins

band

cease.

additional

oscilla-

when

the

is

rota-

The

ad-

full

turns

adjustment

be

227

-5984

(9/65)

4.7

screw

is

not

backed

pOint

at

the

I

to

bridge

NOTE:

band

should

by

the

potentiometer.
corresponds
that

can
cumstances
than

two full

the

most

Coarse

Single Shot)

1.

Apply

operating

2.

Monitor

This

5

milliseconds

applied.

3.

Adjust

Ready

the

(Figure

A fine

20
justments

20

Milli-inch

NOTE: When stepping
trol

mode,
controlled
riage

would

The

direction
Switch

located

high voltage end,

resistors

If

the

system

be

narrowed

to

the

be

measured

should

turns

positive

Timing

20K-ohm,

and 10

Adjustment

access

the

the

line

drops

the

duration

signal

4-3)

timing

milli-inch

have

Integrator

the

direction

manually

strike

of

on the CE

Access

highest

the

from

voltage.

drive
CE Step

from

after

for

Timing

located

adjustment

been

by

either

travel

off,

or

is

rotated

damage

in

the

amplifier

does

not

oscillate,

as

much

The

narrowest

(most

at

pin

F2D13. Under no

potentiometer

the

wiper-end

of

Access

pulses

of

10

the

the

is

to

Control

Ready signal on

+ L

to

-L

the

access

the

-L

::0.5

milliseconds

Cycle

potentiometer

on

the

access

must
Integrator
accomplished.

Trip

Level Adjustment

carriage

of

step

must

CEo

Otherwise,

front

or

controlled

Panel.

beyond

could

circuit.

as

will

dead

positive)

setting

containing

Ready

access

switch.

pin

(+3v

to

drive

level

of

logic

be

made

Trip

in

the

be

rear

crash

by

the

this

result

the

dead

be

allowed

band

voltage

cir-

be

more

(10MS

circuits

-3v) about

pulse

Access

Level

CE

continuously

by

G2D04.

is

using

card.

after

the

ad-

con-

the

car-

stops.

Direction

of

the

actuator

when

the

at

one

track

the

next

this

condition,
reposition
to

achieve

When

this

action

is

NOTE: Non-smooth detenting
by

direct

observation
operating
smoothly and quickly

properly,

carriage

and

track

the

final

condition

very

of

the

that

for

this

moves

arrives

20

milli

the

detent

carriage

track

smooth.

the

detent

detent

it

will

ary.

b.

c.

10

Milli-inch

Readjust

potentiometer

until

be

Measure
record
the
until
and
measure
this

Perform

eter
is
of voltage
with
When

should

and
properly

the

100-ohm, 20 Mil

the

detent

stationary,

the

dc voltage

this

high voltage

potentiometer

the

detent

then

once again

the

voltage

low voltage

a final

to

ensure

65%

of

the

difference

limits

the

most

determining

be

allowed

reverse

Integrator

directions.

adjusted

by

rotating

clapper

but

displays

in

clapper

limit.

adjustment

that

the

producing

positive

the

to

for

Trip

step

mode

occurs

from

zero

at

zero

velocity

-inches

position

prevails,

action

clapper

the

erratic.

at

pin

voltage

value

extremes,

travel

twenty

Level Adjustment

away. Under

mechanism

only

very

accuracy.

the

can

clapper.

will

appear

does

at

motion

between

to

Integrator

in

one

not

erratic

pin

F2B02 and
limit.
opposite

is

Once

F2B02 and

of

the

at

erratic

taken

in

both

The

actuator

milli-inch

slightly

detenting

be

move

be

direction
appear

Next,

direction

first

potentiom-

pin

the

at

the

velocity

to

will

determined

When

so

station-

Set

to

motions.

turn

smooth,

more,

record

F2B02

extremes

motion

100%.

carriage

the

forward

is

now

steps.

1.

Set

the

actuator

appropriately

the

CE

panel.

2.

Perform
drive

20
to
pin

3.

Perform

accelerating

a.

4.&

pulse

Mil

Integrator

obtain a

F2B02.

Command
forward
mode
trol

switch

tion of

an

a fine

to

take

setting

initial

setting

width

by
Set

value

of +3.9 vdc when

adjustment

drive

pulse

the

actuator

and

backward

by

appropriately

on

the

the

detent

20

milli-inch

the

Step Mode switch on

of

the

accelerating

adjusting the 100-ohm,

potentiometer

measured

of

the

20

width

as

follows:

to

step

in

the

20

setting

CE

Panel.

clapper.

Observe

Proper

steps

by

(Figure

milli-inch

continuously

milli-inch

the

4-3)

at

Step Con-

opera-

operation

1.

Set

appropriately
Panel.

2.

Perform
drive

Integrator
tain a value

F~B02.

3.

Perform
accelerating
a.

the

actuator

an

pulse

Set

a fine

Command

forward

mode

by

trol

switch

tion

of

to

take

10

setting

initial

width

potentiometer

of +5. 0 vdc when

drive

and

appropriately

the

the

setting

by

adjusting

adjustment

pulse

the

actuator

backward

on

the

CE

detent

clapper.

Mode Switch

width

milli-inch

of

the

accelerating

the

2K-ohm, 10 Mil

(Figure

measured

of

the

10

as

follows:

to

step

in

the

10

setting

Panel.

Observe

Proper

steps

by

on

the

CE

4-3)

to

ob-

at

pin

milli-inch

continuously

milli-

inch

the

Step

Con­opera-

operation

of

the

actuator

when

the

carriage

ity

at

one

ity

to

the

next

Under

this

will

reposition

slightly

to
accuracy.
the

detenting

NOTE: Non-smooth
mined

by
When
move

be

stationary.

b.

c.

direct
operating
so

smoothly

Readjust
Set
tion
to
tions.
and

turn
direction
is

ratic.
pin

Perform a final

eter

is

observation

properly,

the

potentiometer

until

the

be

stationary,

Measure

record

the

potentiometer

until

first

smooth,

Once

F2B02 and

to

ensure

65%

of

the

of voltage

wi

th

the

most

When

determining

raige

should

Fine

Timing

(10MS

1.

Apply
using
carriage
inch

2.

Adjust

eter

milliseconds
leading
G3B03 and
the

forward

tor
inch

Single Shot)

the

step

(Figure

Access

and

is

now

steps.

Adjustment of

access

drive

CE Step Control switch

forward

mode.

the

20K-ohm,

4-3)

between

edge of

the

Ready

for

this

moves

track

and

arrives

track

10

condition, the

the

carriage

achieve

When

detenting

this

action

final

condition

is

action

of

the

detent

and quickly

that

2K-ohm. 10 Mil

by

rotating

detent

clapper

but

displays

the

dc voltage

this

high voltage

the

detent

and

then

more,

measure

record

adjustment

that

the

difference

limits

producing

positive

the

be

allowed

reverse

properly

directions.

adjusted

Access

pulses

and

backward

Timing

to

provide a time

the

negative-going

the

Access

positive-going

signal

at

step

mode

from

zero

at

zero

milli-inches

detent

only

track

position

prevailS,

very

smooth.

can

the

detent

clapper

it

will

Integrator
in

does

erratic

at

limit.

in

the

opposite

clapper

once

again

the

this

low voltage

of

the

voltage

at

between

erratic

value

taken

extremes,

to

travel

for

Ready

to

the

machine

to

step

in

the

Cycle

potentiom­of 14

Drive

pulse

trailing

pin

G2D04.

occurs

veloc-

veloc-

away.

mechanism

very

be

deter-

clapper.

will

appear

one

not

to

direc-

appear

mo-

pin

F2B02

Next,

motion

er-

voltage

at

limit.

potentiom-

pin

F2B02

the

extremes

motion

as

100%.

the

car-

in

both

the

The

actua-

10

milli-

by

the

20

milli-

:1:0.

1

at

pin

edge of

Tachometer

Dynamic
cannot
tion
system

1.

2.

be

for

Step
inch
eter
is

no
Stop
age

should

balancing

adjusted

carriage

the
step
Balance

longer

the

from

value.

3.

Step

the

ohm,

Tachometer

other

direction

comes

4. Stop

the
voltage
value.

5.

Compute
voltage and
Balance
appears

6. Recheck
setting
100 ohm, 20 Mil
contained
initial voltage

7.

Recheck
setting
2K-ohm,
described
initial

voltage

4.6

DRIVE MAGNET

4.6.1

Drive

(Figure

1.

Turn

off

2.

Push

the

3.

Remove
which

secures

4. Remove
net which
bracket.

5.

Slide

magnet

cradle.

Dynamic

be

actuator

mode and

Balance

is

necessary

for

proper,

travel

in

both

dynamically

continuously

adjust

potentiometer

smooth.

actuator

pin

actuator

and

F2B 12

once

measure

to

pin

more,

Balance

until

the

detent

smooth,

actuator

from

the

potentiometer

across

the

by

and

and

pin

F2B12

average

adjust

the

the

designated

20

milli-inch

performing

again

again

to

value of

2K-ohm

until

a fine

Integrator

in

steps

3a,

3b, and

the

10

by

performing

10

Mil

in

steps

setting

setting

contained

milli-inch

a fine

Integrator

3a, 3b, and 3c. Omit

described

AND

COIL

Magnet Removal and

4-2)*

all

power

carriage

screw

the

secures

and clip

the

screw

to

the

forward

from

strap

and clip

magnet

horizontally

Adjustment

when the

smooth

directions.

balanced

in

the

the

2K-ohm,

until

detent

the

F2Dll.

and

turn

potentiometer

action

becomes

measure

F2Dll.

the

balance

Tachometer

this

voltage

pins.

integrator

adjustment

Set

potentiometer

3c.

in

integrator

adjustment

Set

potentiometer

in

Replacement

machine.

as

far

as

top of

clamp

to

magnet.

from

back

to

cradle

back

from

system

detent

The

as

follows:

10

milli­Tachom­action

balance

Record

the

first

erratic.

the

balance

Record

value

trip

for

Omit

steps

trip

for

steps

it

will

the

magnet

of

of

actuator

bracket

opera-

volt-

this

2K-

in

the

be-

this

level

the

the

1 and

level

the

the

1 and 2.

extend.

the

mag-

2.

227-5984

(9/65)

*Altemate

serial

procedures

numbers 00001 through 00050,

are

contained

in

Chapter 7 fOr

machines

with

4.9

6.

Replace
through

stop on

installation

4.6.2

1.

Turn

2. Remove

3.

Unsolder'voic'e coil

from

4. Remove
located

5.

Slide coil

off dowel

CAUTION:

to

terminals

I

Reversal
carriage

6.

Replace

4.

4.7

DETENT ASSEMBLY

4.7.1

1.

Disconnect detent coil
Mark
moval

2.

Remove two
securing

base.

3.

Remove
away

4.

Replace
2, and
tighten
(refer

4.7.2

WARNING:
fixed

pawl-to-rack

by

controlling

piece

circumstances,
electromagnet,

Drive

off

which

Replace

Detent

from

Detent

of

the

the

drive

5.

actuator

Coil Removal and

all

drive

three

inside

horizontally,

pin.

·Ensure
on

of

these

motion

drive

Assembly

pin

to

facilitate

detent

detent

detent

3.
at

this

to

section

Assembly

The only CE

the

energized

magnet

Ensure

with mounting

ac

and dc

magnet

each

binding
the

the

resulting

coil

drive

location

nex-head

carriage

Insert

time.

alignment which

air

loosen

or

pawls

by

that

bracket

power.

(refer

leads

lead

is

head

voice

that

correct

voice

leads

would

by

reversing

magnet

AND

Removal

of

identification.

mounting

assembly

assembly

assembly.

assembly

mounting

Adjust detent

4.7.

2).

Adjustment

adjustment

gap

between

detent.

screws

and

reversing

magnet

before

screws.

Replacement

and note

removed

mounting

coil.

away

coil

after

cause

in

damage to eqUipment.

(see

DETENT RACK*

leads

from

each

to

by

lifting

by

reversing

screws,

Do not,

holding

pole

steps
contacts
securing

to

section

terminal

•.

from

carriage,

leads

replacement.

uncontrolled

steps

Section

and

Replacement

terminal

lead

prior

screws

carriage

it

assembly

(Figure

required

is

established

clapper

under

the

pieces.

screws

are

2 through

4.6.1).

mounting

upward

steps

but

and

springs,

1

front

the

4.6.1).

.

matched

strip.

to

re-

1,

do

not

4-4)

is

the

pole

any

1.

Energize

2.

Push

registration

the

corresponding

(Figure

3.

Insert

a

gap

between

detent

assembly

energized

4.

Ensure
and
assembly

have a

5.

Repeat

energizing

O.

with pawl engaged

6.

Tighten
assembly.
clapper
that a 0.006
maintained.

7.

Insert
cable
used

WARNING:

before

8.

Set

steps.
carriage

pawl should now

9.

Move

between pawl and

10. Set
steps,

tion of

11.

Turn

12.

Replace

NOTE: The
a CE
detent
section

4.7.3

Removal

1.

Remove

that

pole

sliding-fit

this

006-inch gap

CE

from

to

control

The CE

continuing with

the

CE Step Mode

Using

carriage

theCE

and
the

off

Cartridge

assembly

4. 17.

Detent

one of

the

detents.

ledge

of

detent

edge

of

carriage

4-4).

O.

006-inch, non.:..magnetic

clapper

detent

the

piece

to

engage

procedure

its

mounting

Check

and

pole

(±0.001) inch

disk

processor

one

track

Step Mode switch
repeat

other

all

power

CPU

Read/Write

installed

has

1.

)

Rack

detent

and

pole

along

registration

pawl

engages

O.

006-inch

is

maintained

the

in

the

electro-magnet

between

in

screws

the

pieces

cartridge,

acceSSing.

disk

the

the

CE Step Control

(0.010

be

engaged with

slightly

rack

steps

detent.

to

signal

cable

head

been

Removal and Replacement*

assembly

gap betWeen'

rack.

gap.

for

the

clapper

rack.

to

air-gap

of

both
clearance

and

so

that

cartridge

procedure.

switch

inch). The

to

check

engagement.

8 and 9

the

machine.

on

must

after

each

accomplished.

(refer

,

assembly

mounting

shim

in

piece

and

slide

ledge

until

the

rack.

clapper

while pOSitiOning

The

shim

should

other

detent

by

and

maintaining

and

pole

piece

secure

the

dimension

detents

is

remove

CE

switches

must

be

to

10

mill
switch,

the

rack.

for

good

to

20

milli-inch

to

check

processor.

be

adjusted

adjustment

(Refer

to

s'ection

detent

between

to

ensure

CPU

can

inserted

i-inch

move

other

contact

opera-

with
of

4.7.1).

against

base

the

the

the

signal

be

detent

the

to

*Alternate

serial

4.10

procedures

numbers 00001 through 00050.

are

contained

in

Chapter

7 for

machines

with

Gap

and

(With

Energized)

0.006"

between

Pole

Piece

Magnet

Odd

Detent

(±

0.001")

Clapper

Pawl

Rack

Mounting

Clip

Rack

Electromagnet

Mounting

Screw

( 1)

Figure

4-4.

Detect

2.

3.

Remove
and

clip

the

carriage.

Lift

detent

Assembly,

the
that

rack

single

secure

Adjustment

binding-head

detent

to

remove

rack

from

Replacement

1.

Place

detent

rack

in

position
Position
100 on
mark
sure

227 -5984

carriage

on

contact

(9/65)

rack

rack.

so

that

is

aligned

Press

between

ca1ib~ated

with

downward on

registration

mounting
(Figure

carriage.

shown-in

mark

Figure

for

corresponding

rack

surfaces

screw

4-5)

track

to

en-

on

to

4-5.

detent
(refer

2.

Install

clip

to

3.

Replace

4.

Check
spacing

to

section

5.

Realign

6. Adjust

4.10.2).

7.

Adjust

rack

and

registration

to

section
single
secure

detent

detent

and

4.7.4

binding-head

the

assembly

adjustment

detent

4.7.2).

read/write

Crash

Stops

Home Switch

for

detail

mounting

installation.

(refer

by

observing

alignment

heads

(refer

(refer

to

(refer

to

ledge

of

to

with

to

section

section

on

carriage

adjustment).

screw

section

clapper

the

rack

section

4.10.1

4.11.2).

and

4.7.1).

(refer

4.17.1).
and

4.11

Rack
Maunting
Clip

Track Mark 100
on Carriage
aligned on

Rack

Rack

Carriage

Flush

within

:!:

0.00)"

2. Remove solenoid
(pins 7 and 8).

3.

Remove pivot

4.

Remove two binding

5.

solenoid
Slide

to

effect

6.

Replace
steps
(section

to

mounting

solenoid

removal.

the

head

1 through

4.8.2).

leads

from

pin

from

solenoid

head

bracket.

horizontally

load

solenoid

5.

Readjust

terminal

screws

away

by

head

strip

plunger.

securing

from

bracket

reversing
load

assembly

TB4

to

Registration Surface

on Detent

Figure

4.

NOTE:

during
loosened
the

When a
calibrated
aligned
The
pressed
tration
clip

4-5.

7.

4 Detent

Adjustment

replacement

carriage.

detent

with

top

registration

ledge

must

Rack

Detect Rack Removal and Replacement

or

readjusted

mark

the

to

establish a flush

be

tightened

Registration

on Carriage

Rack

Adjustment

of
only. The

rack

is

for

corresponding

of

carriage.

the

detent

after

replaced

track

100 on

surfaces

to

secure

Ledge

it

contact

The mounting

alignment.

4.8

HEAD LOAD ASSEMBLY

4.

8.

1 Head Load Solenoid Removal and

1.

Turn

off

all

ac

and dc

power

rack
rack
is

initially

(section

the

mark

of

detent

the

to

Maunting Screw

is

accomplished

should

never

installed

4.7.3),

carriage

on the

rack.

rack

With

the

screw

detent

rack

Replacement

machine.

is

must
regis-

and

~

be

the

be

on

4.8.2

Head Load

WARNING: Do
ing

in

machine.
insert
Failure
or

1.

2.

3.

an

disk.

Remove
on

machine.
Install
Power

IBM

to

comply

a CE
up

CPU

heads.

NOTE:
second

procedure

Read/Write

delay.

to

a.

Observe
out.

b.

Shut off

c.

Loosen
secure

bracket.

d.

Use

the

per

turn)
backwards
has

bottomed
wards
has

not
approximately

e.

Tighten
adjustment.

4.

Use

masking

in

the

transferred
mounting
toward

the

Assembly

not

load

heads

When

cartridge

card

between

will

result

signal

cartridge

the

machine and

heads should

If

heads

fail

accomplish

that

solenoid

power

to

the

two binding

the

head

solenoid

to move

in

the
out,

approximately

bottomed

0.031

the

two mounting -screws

tape

to

position.

screws

and

solenoid

as

Adjustment

when

heads

in

cable

from

in

machine.

check

to

load,

is

damage

load

disk

out

prior

plug

for

after a 90-

use

(Figure

is

of

to
to

connection

loading of

the

head loading:

plunger

has

machine.

head

screws

load

solenoid

adjust

the

solenoid

bracket.

move

0.031

screw

If

the

solenoid

inch.

to

the

(0. 031-inch

forward

solenoid

out, move solenoid

inch.

hold

the

heads

loaded

slide

far

Loosen

the

as

possible.

the

switch

4-6)*

not

rotat-

machine,

loading.
heads

and/

following

bottomed

that
mounting

or

plunger

back-

If

solenoid

forward

to

secure

switch

switch

backwards

the

4.12

*Alternate procedures are contained

serial numbers

00001 through 00050.

in

Chapter 7 for machines with

Heod Load Com
Loaded

0.050"

Max

Clearance

Unloaded

Pivot

Plate--~~

Assembly

Figure

4-6.

Head

Looded

Load

Assembly,

Adjustment

Heads-Unloaded

Adjust Screw

Heods-Loaded
Switch

WARNING:
in

transferred

solenoid

5.

With
the

two
noid
ward
loading
to

slide

all

the
solenoid
noid
solenoid.

6.

Back
and

tighten
mounting
ward
justing

7.

Check
head

within

mounting
obtained.

8.

Adjust

procedure.
a.

Slide
against
move

If

the

position,

coil

resulting

the

carriage

solenoid

adjusting

until

the

roll

the

way

into

mounting

adjusting

off

the

the

screws

so

that

screw.

clearance

loading

0.031
screws

heads

switch

the

Heads Loaded

48

in

damage

detented

mounting

screw.

pivot

plate

pin

in

the

head

solenoid

the

back

cam

screws

screw

against

solenoid

it

lock

and

will

adjusting

nut.

slide

bear

between

roll

pin.

(±O. 010)

inch.

after

loaded

switch

toward

the

head

load

masking

switch

vdc

will

to

at

screws

Slide

the

contacts

load

until

followers.

and

the

Loosen

the

lightly

the

pivot

This

clearance

Tighten

this

clearance

using

head

load

actuator

tape.

is

be

applied

equipment.

track

000,

and

solenoid

the

cam.

the

cam

Tighten

position

back

screw

the

solenoid

solenoid

against

plate

the

the

following

contact

link

not

held

to

loosen

the

sole-

back-

head-

Continue

moves

the

sole-

of

the

one

turn,

back­the

ad-

and

should

solenoid

has

been

point

and

re-

the

be

b.

c.

CAUTION:
hand to
is

warm
24 vdc
adjustment
coil

resulting
too hot
is

not

9.

Adjust
is

excessively

section

10.

Remove

11.

Adjust
when

(±O;

the

heads

Tighten

NOTE:

load

Failure

cam

assembly.

Place a 0.005
button

and

toms

out.

Tighten

in

this

position.

Feel

inspect

to

the

is

applied. A defective

will

in

to

grasp

in

proper

the

heads

inch

link.

mounting

the

head

for

overheating.

touch

during

cause

48

excessive
and hold,
adjustment.

loaded

hot.

(Refer

4.8.3.)
power

from

the

heads-unloaded

heads

are

unloaded, a clearance

020)

inch

exists

unloaded

the

requires

locknut

of

roll

to

the

linear

replacement

shim

Move

screws

loaded

normal

vdc to

heating.

the

switch

the

machine.

adjust

between

on

the

secure

ball

of

between

switch

to

secure

solenoid

The

operation

Heads

be

applied

heads

loaded

if

solenoid

to

procedures

screw

the

pivot

head

this

adjustment.

bearings

the

carriage

switch

until

it

coil

solenoid

Loaded

If

the

so

of

plate

load

or

bot-

switch

by

coil

when

Switch

to

the

coil

is

switch

coil

of

that

0.030
and

cam.

head

227 -5984

(9/65)

4.13

4.8.3

1.

2.

3.

4.

5.

6.

7.

4.9

4.9.

Heads
and

Remove

Unsolder
ure
lead
Remove
plate
Remove
Replace
2,
as
Power
heads
inch
load
Tighten

Adjustment

all

4-6)

and

is

removed.

two

located

heads
heads

3,

and

near

as

up

are
shim.
actuator

mounting

Loaded

ac

and dc

leads

note

binding

underneath

loaded
loaded

4.

The

possible
machine
loaded,

Slide

link

Switch,

at

beads

terminal

switch

to

and

transfer

switch

until

screws.

power

head

switch.
switch

the

load

switch

HEAD LOAD SPRING ASSEMBLY*

1 Head

Load

Spring

Assembly

Replacement*

1.

Remove
head

2.

Remove

3.

Remove

NOTE:
as a complete

4.

Replace
reversing

4.10

CRASH STOPS

the

load

spring

pivot
spring

The

head

unit

the

steps 1 through

split

assembly

pin.

assembly.

load

and

head

retainer

spring

is

not to

load

spring

Removal,

from

loaded

from

screws

the

switch.

by

should

solenoid.

heads.

switch

and

shim

bottoms

Removal

ring

from

pivot

assembly

be

disassembled.

assembly

3.

Replacement,

the

machine

sWitch

which

from

(Fig-

each

nut

reversing
be

positioned

As

soon
with a 0.005­toward

out.

one

pin.

is

r:eplaced

by

steps

head

and

side

as

of

4.10.2

Use

Rear

appropriate
carriage
against

rear

Adjust
tighten
ance

locknut

exists

Operate
then

reverse,
clearance
stop

when

4.11

HOME SWITCH*

4.11.1

Home Switch
(Figure

1.

Remove

2.

Remove

3.

Remove
to

mounting

4.

Replace

and

adjust

4.11.2

1.

Home Switch

Use
operate
on

track

2.

Place a 0.007

carriage
and

adjust

the

switch

3.

Check
gage

transfer.

Crash

switches

in a reverse

crash

screw

on

so

that a O.

between

carriage,

to

check
adjustment
carriage

4-2)

all

ac

leads

from

two binding

bracket.

Home Switch

switch

appropriate

carriage'

001.

-inch

actuator

the

home

just

this

adjustment

to

determine

Stop

Adjustment*

on

direction

stop

(near

left

end

003

rear

crash
first
that

is

maintained

is

detented

Removal

and dc

power

Home Switch

head

by

according

Adjustment

switches

in a reverse

feeler

and

home

switch

transfers.

that

the

CE

to

detent

drive

'of

rear

(±O.

stop

in

forward

the

0.003

on

track

and

from

screws

reversing

to

on

the

gage

switch

adjusting

with a O.

home

switch

Panel

to

operate

on

track

magnet).

crash

stop

001)

inch

clear-

and

carriage.

direction

(±0.001)

at

the

rear

000.

Replacement

machine.
terminals.
securing

steps

2 and 3

Section

direction

between

CE

4.11.2.

Panel

to

the

pushbutton,

screw

005-inch

will

feeler

not

000

and

and

inch

crash

Switch

to
detent

until

4.10.1

Use
carriage
against

tighten
ance

then
clearance
stop

*AItemate

serial

4.14

Front

appropriate

in a forward

front

crash

Adjust

screw

locknut

exists

between

Operate

carriage

forward,

adjustment

when

carriage

procedures

numbers

00001

Crash

Stop

switches

stop

on

right

so

that a 0.006

front

to

check

is

are

contained

through

Adjustment

on

direction

(near

end

crash

first

in

that

the

is

maintained

detented

in

00050.

the

CE

Panel

to

detent

spindle).

of

front

(±O. 003)

stop

reverse

0.006
at

on

track

Chapter 7 for

and

to

on

track

crash

inch

carriage.

direction,

(±O. 003)

the

front

202.

machines

operate

202

stop and

clear-

and

inch

crash

with

4.12

TACHOMETER
EXTENSION

4.12.1

tachometer

The

the

tachometer

the

core

moving

broken

or

Tachometer

Replacement

extension

core

assembly.

the

extension

scarred.

AND

ROD

Extension

(Figure

by

unscrewing

Use

rod

ReIpove

TACHOMETER

Rod

Removal

4-2)*

rod

can

be

the

extreme

because

the

care'
the

rod

as

removed

rod

from

when

core

can

follows:

and

from

re-

be

1.

Unscrew
which
in

2.

Remove
in

3.

Detatch
carriage
the
and housing

4.

Replace
steps

serves

the

carriage

the

carriage

the

home

tachometer

1,

2,

and

remove

as a lock

bracket.

set
bracket.
rod

by

bracket,

switch

assembly.

and

the

screw

screw

which

unscrewing

and

slide

and out of

extension

3.

home

secures

the

the

switch

to

actuator

retain

the

it

from

the

rod

away

tachometer

rod

by

reversing

the

rod

rod

from

coil

2.

Loosen
tachometer

base.

3.

Slide

the

in

the

shield.

4. Tighten
justment.

5.

Check

binding

tachometer

the

the

two

set

screws

and

shield

shield

along

the

rod

is

flush with the end of the

the

two

set

screws

the

carriage

does

not

for

prevail

extension

which

to

the

carriage

rod

until

to

friction

as a result

rod

adjustment.

secure

the

secure

to

ensure

the

mounting

groove

tachometer

the

ad-

that

of making

4.12.2

The

tachometer
visually
the

groove
carriage
riage

is

justment

NOTE:
make

this

1.

Detent

*Altemate

serial

numbers

Tachometer

extension

by

positioning

on

the

rod

end of

the

detented

as

Do

follows:

not

disconnect

at

adjustment.

carriage

procedures

are

00001 through 00050.

Extension Rod Adjustment*

rod

is

to

be

adjusted

the

tachometer

is

flush

tachometer

track

000.

the

to

track

000.

contained

in

with

shield

Perform

rod

Chapter

the

from

7 for

shield
end

of

when

the

carriage

machines

the

so
the

ad-

that

car-

to

with

4.

12.3

Tachometer
Replacement

1.

Remove

2. Remove
from

base

3.

Unsolder
on

tachometer,

identification.

4.

Remove
section

disk

cartridge

cartridge

plate.

tachometer

the

tachometer

4.12.1).

Assembly

(Figure

from

receiver,

cable

and

mark

extension

Removal and

4-2)*

machine.

shroud,

leads

from

each

lead

rod

and

terminals

to

facilitate

(see

spindle

227

-5984

(9/65)

4.15

WARNING: Caution
the

tachometer

assemblies

5.

Remove

mounting

can

the

base

core

be

two

shield.

6.

Slide

tachometer

base

and

tachometer

7.

Slide

tachometer

of

tachometer

WARNING: Slide

end of

tachometer

not

bend

tachometer

since

they

can

coil

break

assembly.

8.

Replace

the

tachometer
steps 2 through
section

4.13

4.13.1

1.

Turn
remove

2.

Remove
at
the

base.

3.

Insert
carriage
preload
of
avoid

4.12.2.

CARRIAGE RAIL

Carriage

(Figure

off

front

rail

Rail

4-2)*

all

ac

top

baseplate

two

retaining

and

rear

in V -grooves

)

0.100-inch
preload

force

the

carriage

misalignment.

must

be

and

extension

damaged

set

screws

which

secure

shield

bracket.

coil

shield.

and

shield

nearest

electrical

within

7, and

Removal

and dc

of

rail.

feeler

spring

on

the

rail,

mounting

exercised

if

dropped.

in

out

of

and

housing

housing

leads

the

coil

assembly

adjust

and

power

cover.

screws,

(These

of

the

gage

and

and

base

in

rod.

These

the

carriage

the

tachometer

carriage

assembly

assembly

the

spindle.
back

and

housing

by

according

Replacement

to

the

machine

one

each,

screws

carriage

shim

between

carriage.

slide

the

being

handling

mounting

out

the

Do

and

forth

reversing

to

located
retain

mounting

Remove

rail

careful

out

and

the

out
to

2.

Remove

3.

Remove

4.

Remove
secure

remove

NOTE: When
ensure
with

registration

mounting

5.

Replace
reversing

4.15

4.15.1

drive

magnet.

drive

coil.

two

binding

preload

bearing

bearing

replacing

that

edge

of

preload

surfaces

screws.

carriage

steps 2 through

CARRIAGE SUBASSEMBLY

Carriage

Subassembly

Replacement*

1.

2.

3.

4.

5.

6.

Remove
Remove

Loosen
clamp
plugs
Remove

(see

Unsolder
which

Remove

carriage

all
Drive

binding

to

release

from

tachometer

section

voice

each

three

outrigger

ac

and dc
Magnet.

head

4.12.1).

lead

binding

slide.

7.

8.

Remove

Lift

carriage

carriage

carriage

mounting

assembly

WARNING: Caution

read/write

heads

do

removal.

(Refer

head

assembly.

bearing

before

preload

power

head

screw

head

plug.

cables.

extension

coil

leads

is

removed.

head

slide

rail

(see

base.

must

be

not

strike

(Refer

to

to

Section

mounting

spring

to

assembly

bearing

tightening

bearing

4.

Removal

to

(Section

securing

Disconnect

rod

and

note

screws

to

carriage.

section

vertically,

exercised

anything

Section

4.6.2.)

screws

carriage"

in

is

fully

assembly

and

machine.

4.

6.

1.

head

from

terminal

which

4.13.1).
away

to

ensure

during

4.6.1.)

which

and

step

engaged

the

by

)

plug

head

carriage

from

secure

Remove

from

that

4,

WARNING:
the

carriage

4.

Replace

and

4.14

4.14.1

1.

Remove

*Alternate

serial

4. 16

Misalignment

in

this

step

could

bearings.

carriage

rail

by

reversing

3.

CARRIAGE PRELOAD BEARING ASSEMBLY

Carriage

Removal

procedures

numbers

all

00001

Preload

and

Replacement

ac

and dc

are

contained

through

Bearing

power

00050.

in

Chapter

Assembly

to

the

7 for

damage

steps

2

machine.

machines

with

9.

Replace
steps 2 through

10.

Adjust

section

11.

Adjust

section

12.

Perform

riage
a.

Check

necessary

b.

Adjust
to

carriage

7.

tachometer

4. 12. 2.

head-arm

4.17.1.
the following

subassembly

detent

according

front

section

4.10.

subassembly

extension

assemblies

adjustments

has

been

adjustment

to

and

rear

crash

by

reversing

rod

according

according

if

installed:

and

readjust

section

stops

to

a new

4.7.2.
according

to

car-

if

c.

Adjust

4.11.2.

4.16

READ/WRITE HEADS

4.16.1

The
of
in
tion

4.16.2

The
unless
causing

Read/Write

Service

the

preventive

Figure

of

the

Read/Write

inspected

it

errors.

Disk

Check

3-1.

causes

is

capable

damage

by:

1.

Persistent
head

after

2.

Helical

scratches

scratches

3.

Audible pinging

home

switch

Head

for

maintenance

Refer

to

of

read/write

Head

read/write

of

damaging

by a head

oxide

collection

cleaning.

and

on

that

disk

noises.

according

Service

read/write

schedule

Section

Replacement

head

need

can

0.010
surface.

Check

heads

3.3

for a descrip-

head

damage.

not

disk

surfaces

usually

on the

suspected

inch

spaced

to

section

is a part

described

be

replaced

or

be

detected

radial

2.

Check

electrical

head

to

carriage.
exceed 5 ohms.
5

3.

ohms,
and/or
Check

If

ground
carriage

this

replace

head
resistance
resistance

lead

in

to

baseplate,

connections.

4.17

HEAD-ARM ASSEMBLY

4.17.1

Both
recorded

width of

data

with a

720 KC. The
element

justment
equal
sirn

Head-Arm

sides

of

master

this

track

after

clock

of

the

and

amplitudes

al

•

the

track

tunnel

pattern

track

read/write

both

resistance

This

If

this

read/write

load

spring

from
exceeds 5 ohms,

the

drive

Assembly

CE

Cartridge

tracks

(0.005

at

inch)

erasure.

of

all

zeros

is

read

head

heads

must

for

the

envelopes developed by the

from

resistance

resistance

head-arm

assembly.

carriage

coil

cable,

for

breakage

Adjustment*

contain

track

position

is

the

The

at a frequency

by

the

tunnel

for

purposes

be

adjusted

read/write

should not

exceeds

assembly

to

baseplate.
check

which

or

loose

accurately

100.

same

as

track

is

erasure

to

the

grounds

The

a

written

of

of

ad-

obtain

If

any of

head

should

NOTE:
and

visually

"comet

to

damage

After

the

new

after

the

the

disk

4.16.3

The

resistance
should
cannot

Follow this'

1.

With

loading

a

*Alternate

serial

numbers

the

above

be

replaced.

Clean

the

inspect

trails"

head

the

head

should

new

with

new

replacement

head

cartridge.

Read/Write

Check

from

be

checked in

be

traced

cartridge

pad

procedures

00001

symptoms

disk

using

the

disk

embedded

head.

be

checked

is

loaded

Head

read/write

the

event

to

any

other

procedure:

out

of

(IBM

card).

are

contained

through

00050.

See

to

the

in

the

surface

and

and

Base

occur,

the

disk

to

particles

Section

proper

for

audible

is

addressed

Plate

head

of

read

source.

machine,

Chapter

7 for

suspected

cleaning

be

certain

are

present

3.3.1.

disk

tinging

Resistance

to

baseplate

errors

load

head

machines

fixture

no

cleaning,

onto

which

on

with

NOTE:
(P/N
into the
scoping
ing

Figure

are

The

2200052)
preamplifier
is

screws

4-7.

shown

The CE

so

that

it

tunnel

erase

the

disk,

pole

tip

during

prope!

on

sweep

adjustment

the

scope

If

a
more

slight

envelopes
as

shown

If

a

bad

inch), one

signal,

appear

of

on

Head Alignment

is

used

from

Pin

D3B07.

and

adjustment

Oscilloscope

in

will

and

Figure

track

pole

then

is

sweep

tip

slightly

the

4-8.

written

slightly

during

other
of

as

shown in View

misalignment

under

one

generated

in

View A,

will

Figure

misalignment

leg

only will

more

or

less

the

scope.

to

connect

of

the

read

screws

Signal-pattern

one-half

above

one-half

the

heads,

leg

than

be

at

exists

see

the

constant

Oscilloscope

the

erase

circuit.

Location

with a

below one

of

is

shown in

slight

leg

revolution

the

other

revolution.

the

signal

B,

Figure

exists,

the

the

other,

different

4-8.

(for

example:

track,

and a

amplitude,

Adapter

winding

Output

head

for

clamp-

displays

eccentricity

of

the

of

leg

of the
With

will

appear

4-8.

track

will

and

the

amplitudes

0.004
large
will

227

-5984

(9/65)

4.

17

Figure

4-7.

Head-Arm

Head Adjust

(2)

Screw

Detent

Assembly

Clamping Screw

Head 1

located

at

Adjustment

Track 100

Head Positioned
to read on

CE

Track 100

If

misalignment

inch),

no

Procedures

are

to

be

1.

Torque

pound

2.

Back
each
coil
potted
required

3.

Install
machine
access
that
location.

4. Allow
continuously
temperature
fore

5.

Scope
play 5 ms/cm

40

ms.)

Negative

6.

Insert
(P

/N
socket
Head

signal,

only

for

accomplished

both

head

-inches.
off

the

head

head-arm

until

the

head

capsule

the

the

the

the

to

observe

CE

to

load

carriage

even

machine

on

cartridge

detent

for
stabilization

adjusting

from

heads.

Pin

(one
Synchronize
Reference,

the

Head

2200052)
for

Select

between

Head

switch.

is

total

(for

noise

will

adjustment

as

follows:

clamping

adjusting

assembly

load

spring

the

head. A

the

lower

heads.

to

track

is

energized

and

cartridge

15

minutes

D3B07.

revolution

the

Pin

Alignment

the

O.

Select

example:

appear

of

head-arm

screws

screws

back

toward
just

dental

head.

and

apply

Use

the

CE

100, and

at

to

to

ensure

has

taken

Set

time

base

of

the

oscilloscope

K2B04.

Oscilloscope

head

cable

Head 0

0.100

on

the

to

3.5

and

the

clears

mirror

power

switches

ensure

this

operate

that

place

to

disk

on

plug

with

scope.

assembly

(±1.

push

voice
the

is

to

the

track

be-

dis-

is

Adapter

and

the

CE

to

0)

7. Slowly
serving
noise
will

appear.

the

pattern

and

the

NOTE:
the

If

spindle,
machine,
arm

backwards

in

step

2,

assembly

load

spring

bly

spring.
tact

with

write

coils.

rack

slightly

using

step

8.

Back
when
the

scope

alignment

9.

Use

the

steps 2 through

NOTE:

the

If

adjustment

advance

the

scope

only,

then

of View

lobes

the

head

it

will

remove

toward

then

repeat

is

correctly

will

bear

The

head

the

potted

It

will

if

correct

7.

off

the

head

adjustment

display

is

CE

switch

the

detent

of

the

head

pattern.

the

When

the
B,

will

be

is

moved

be

necessary

the

CE

the

step

positioned,

on

the

load

capsule

be

necessary

adjustment

adjusting

has

pattern

not

affected.

to

8.

rack

head-arm

adjusting

The

pattern

head

Figure

equal

in

forward,

cartridge,

voice

7.

When

dimple

spring

which

been

completed.

to

select

was

moved

assemblies,

screw

scope

of View

is

properly

4-8

will

amplitude.

too

to

shut

and

coil

as

the

the

lip

of

the

will

not

encases

to

shift

cannot

screw

one-half

ensure

Head

1,

to

while

will

first

show

A,

Figure

aligned,

be

present

far

toward

down

the

push

the
described
head-arm

of

the

head

arm

assem-

be

in

con-

the

read/

the

detent

be

made

turn

Observe

that

the

head

and

repeat

accomplish

it

will

be

ob-

4-8

4. 18

o 5

10

15

20

25

30 35 40

WARNING:
head-arm
handling
surfaces.

or

Caution

assemblies

contamination

must

be

to

prevent

exercised

from

damage

contact

when

from

with

handling

rough

solid

hn

1\/\1

a

~Jl

1~

IVV

V\J

IVV

t

1""1

....

11l

V\

----40ms---

® Initial appearance of master track

Signal

from

one leg

of

Tunnel

Erase

Pole Tip

10

0

5

15

20

25~0

;

lJ\I

......

I~

® Master track display

Figure

4-8.

Signal

40ms

"

for

properly adjusted head

Patterns for

Head

{

nn

V\J\

100

/

~

__

..

~1

1

/

~

IVV

Signal
othe
Tunn
Pole

3~40

-11

D~

f~llI

"-

·1

Amplitudes

"

Alignment

Adjustment

from

r leg of

el Erase
Tip

Equal

4.

Place

fingers
flex-gimble
head

be

lifted

5.

Replace

Readjust

at

track

4.18

CARTRIDGE RECEIVER*

4.18.1

1.

2.

3.

4.

5.

WARNING:
receiver
assembly

Cartridge

Remove
Remove

receiver

Remove

ends

of
Position
remove
rods

to
rods

free.
Remove
receiver

from

springs

horizontally

out.

head

by

head

100

according

all

ac

tension

and

interlock

the

two

cartridge

cartridge

cotter

side

guides.

the

two

pivots.

Exercise

machine

and

disrupting

on

the

arm

or

toward

reversing

arm

assembly

Receiver

and

dc

power

spring

tension

load

receiver

pins

that

Slip

socket-head

care

to

avoid

the

only.

head

assembly.

spindle

steps 1 through

with

to

Section

Removal

from

that

attaches

assembly.

springs

rods.

handle

secure

in

detent

the

cartridge

shoulder

lifting

striking

cartridge

the

adjustment.

Do not

until

CE

cartridge

4.17.1.

and

Replacement

the

machine.

to

located

down, and

screws

cartridge

the

grasp

Slide

head

can

4.

cartridge

at

the

load

load

detent

the

at

necessary
home

switch

extension

4.

17. 2

1.

Loosen
sufficiently

plug

2.

Remove

near

3.

Loosen

this

227-5984

(9/65)

to

readjust

(section

rod

(section

Head-Arm

Replacement

binding

from

plastic

head

time.

to

cable

head

outrigger

Assembly

remove

leads

clamp

the

4.11.2),

4.12.2).

head

screw

leading

from

but

crash

Removal

head

to

head

slide

do

stops

(section

and

tachometer

and

in

head

plug.

Remove

electronics

lead

on

carriage.

not

remove

plug

clip

head

4.10),

clamp

head

gate.

located

at

6.

Lift

the

cartridge

7.

Replace
steps 2 through

8.

Check
cribed
solutely

4.18.2

NOTE:

be

completed

cartridge

a

gage

the

cartridge

is

made,

*Alternate

serial

numbers 00001 through 00050.

the

the

in

necessary.

Cartridge

The

cartridge

prior

interlocks.

for

adjusting

it

should

procedures

cartridge

section

receiver.

receiver

cartridge

6.

4.

Receiver

receiver

to

attempting

Any

the

not

be

are

contained

from

receiver

receiver

18.

1.

Readjust

Adjustment

adjustment

an

cartridge

side-to-side

After

this

changed

in

Chapter

unless

machine.

by

reversing

adjustments

only

(Figure

must

adjustment

serves

position

adjustment

7 for

as

trouble

machines

if

of

des-

ab-

4-9)*

of

with

4.19

1.-

2.288"

Reference

4-9.

Figure

is

suspected.

as

follows:

1.

Loosen

located

so

2. With
in

shoulder

of

the

secure

4.

18.3

NOTE:
adjusted;
standing

ing

procedure:

tion

can

1.

Insert
action
receiver

2.

Verify
fully

cartridge
anywhere

Cartridge

Adjustment

both
on

that

receiver

the

front

its

preferred

screws

cartridge

the

Cartridge

The

cartridge

however,

in

front

be

accomplished

cartridge

of

the
handle

that

seated

is
except

Receiver

socket-head

the

pivots

is

free

of

the

position,

until

receiver

adjustment.

In

Place

in

place

its

function

of

machine

(A

quick

check

in

receiver

cartridge

is

raised.

switch

on

transfers

its

rest

not touching

on

its

Adjustment

is

to

be

accomplished

shoulder

of

the

cartridge

to

move

cartridge

screws

slightly.

receiver

tighten the two

they

just

contact

pivots.

This

Switch Adjustment

switch cannot

may

be

checked

while using

of the switch

by

step

4.)

and

observe

in

place

switch

when

cartridge

pins.

operating

the

Ensure

switch

end.

<t.

receiver

located

surfaces
will

be

the

follow-

opera-

as

that

lever

Receiver

5.000

:I:

0.010"

by

the

the

is

the

t

3.

Use five

shoulder
of
fers

the

cartridge.

before

mM

of

pin.

4.

With

the

cartridge

place

by

the

ridge

in

place,
cartridge
see

up and down with

if

the

transferred

affected. The switch

4.19

INTERLOCKS

4.

19. 1 Handle and
(Figure

The

NOTE:

4.

18.2)

adjustment
ary

posts

of

the
receiver.
removed
the

Handle Stop

Handle Stop

cartridge

must

be

of

located

cartridge

The

to

accomplish

Screw

the

The. handle stop
a

cartridge

parallel

0.30
screw

1.

Remove

is

in

with

the

(±O.

015) inch. Adjustment of

is

accomplished

the

assembly.

a.

Remove
secure

b.

Remove

from

terminal

location

2.

Install

3.

Loosen handle stop

CE

handle stop

parallel

0.030

4. Tighten
made

with

(±0.05)

the

on

the

cards

the

closest

Verify

cartridge

interlock

move

Interlock

4-10)*

receiver

completed

cartridge
on

the

before

receiver

Screw

and

Adjustment

screw

place,
stationary

interlock

the

two

bracket

wire

connections

to

facilitate

cartridge

screw

the

stationary

inch.

locknut

handle

as

shims

rest

is

fully

receiver

latch

the

condition of

must

Adjustment

prior

interlocks.

base

it

is

fully

interlock

interlock

latch

must

be

the

handle
guide

as

follows:

handle and

flat-head

to

base

block

TB6.

in

machine.

screw

so

that

to

secure

stop

screw.

between

pin

and

that

the

switch

seated

handle locked

to

secure

handle

end

moderate

the

remain

transferred.

adjustments

to

attempting

plate

prevent

inserted

magnet

adjustments

screw

clearance.

adjusted

risers

posts

within

the

handle

bracket

screws

plate.

at

pins

Mark

reassembly.

locknut and

handle

safety

the

risers

posts

final

the

the

bottom

trans-

on

the

in

the

cart-

of

the

force

switch

(section

an

Two

station-

lowering

into

the

must

for

so

that,when

will

be

stop

which

3 and 4

each

pin

adjust

are

within

adjustment

rest

to

is

be

the

4.20

*Altemate

serial

procedures

numbers 00001 through 00050.

are

contained

in

Chapter

7 for

machines

with

o Handle Stop Screw Adjustment

Disk Cartridge

Receiver
Handle

Handle Parallel to Cartridge

within

·0.060"(±

-----,

0.030")

o

latch

Screw

Clearance

Lock

Nut

Adjustment

o Latch Switch Adjustment

Latch Switch Transfers

0.020"

with

Latch to

(Max)

Shank

lacknut

(2)

Stop Screw

(2)

o Interlock

0.040" (±

Overtravel

Clear~nce

0.010")
latching

-----

.........

___

M~gnet

Adjustment

Latch Screw

Latch Assembly

Bracket

'?'---4Y'-'

r--

Switch Mounting

Screws

(2)

Figure

4-10.

Handle

and

227

-5984

(9/65)

........

..--

__

-\\-

......

__

____

Latch Switch Assembly

Interlock

Adjustment

.... '-___

=:-----Latch

-t--

Nutplate

Receiver Handle

Screw

Bracket

_____

Interlock Magnet Assembly

Receiver Handle

Latch Assembly

...J

'-----

Interlock Magnet

Mounting Screws

(2)

4.21

Latch

Figure

Screw

4-10)

Clearance

Adjustment

(View

B,

screw

when a

applied.

minimum

of 5

grams

force

is

NOTE:
must
(See

1.

The

interlock

be

removed

step 1 above.)

Fully

rotate

to

accomplish

handle

position.

2.

Adjust

3.
latching
face
latch.
tain

seat
Determine

into

of

this

the

the

Adjust

interlock

the

square-hole

that

0.040

clearance

screw

latch

clearance.

4. Tighten locknut on
has

been

made.

Latch

Switch

1.

Rotate
to

NOTE: The

with

brown

switch

Adjustment

handle

to

fully engage the

shoulder

collar

of

the

is

in

transferred

fully engaged.

2.

Place

three

IBM

latch

screw

and

latch.

still

transfers.

handle and

to

the

latch

(±O.

exists

and

upper

screw

latch

screw

(View C,

the

Cartridge

latch.

of

the

red

switch

position

card

shims

Determine

bracket

this

Cartridge

screw

notch of

010)-inch

between

assembly

adjustment.

In

so

that

the

overtravel

the

edge of notch on

as

necessary

after

adjustment

Figure.4-10)

In

Place

button

will

body

to

denote

when

the

latch

between

shank

that

Place

it

will

latch.

flat

sur-

to

ob-

position

be

flush
that

switch

is

of

the

NOTE: Hold
ientation
gravity

Whe~

switch
with

latch

6.

while

on

the

the

latch

should

the

head

sheet-metal

Reassemble

assembly
mounting
nections

Interlock

Magnet Adjustment (View D,

Adjustment of

to

satisfy

two conditions which

a.

The

parallel

b.

When
at

the

over-travel

NOTE:
manually

Energizing

attracting

Procedures

as

follows:

assembly

in

accomplishing

latch

will

rotates

transfer

of

latch

away

while

screw

thickness.

the

interlock

to

the

baseplate

screws

at

the

long

the

latch

pins

3 and 4 on

interlock

pole

to

the

magnet

screw

of

the

the

for

adjusting

and

face

surface

O.

magnet

latch.

the

normal

this

distroy

from

latch

by

handle and

by

restoring

magnet

of

the

is

energized,

must

040-inch.

may

the

vertical

check.

the

measurement.

the

latch

is

still

at

least

replacing

the

terminal

is

accomplished

are

as

follows:

magnet

of

the

latch.

occur

be

latch

or-

Otherwise,

screw,

engaged

50%

of

the

bracket

the

wire

con-

block

TB6.

Figure

4-10)

must

unlatching

with an

simulated

switch

are

the

two

be

by

NOTE: The

located

Transfer
at
audible

3.

the

switch

Loosen
can
that
still
half

0.020
of

click

be

switch

engaged with

the

switch

4.

Tighten
subsequent

been

accomplished.

5.

Check
transferring

latch

into

4.'2.'2.

switch

the

should

inch

(max. ) from

switch
terminals,
which

occurs

switch

screws

repositioned)

will open.

thickness

opens.

latch

switch

slippage

that

the

light

the

switch

contact

with

transfer

may

be

or

by

when switch

slightly

and

Verify

the

latch

of

the

screws

after

latch

and then

the

shank of

checked

listening

operate

screw

latch,

securely

this

spring

shank of

with

the

latch

electrically

for

the

transfers.

{so

that

switch

the

latch

that

the

latch

by

at

at

the

time

to

adjustment

succeeds
pulling

the

latch

latch

screw.

so

is

least

prevent

has

in

the

1.

Loosen
to
ciently

but

2.

Manually

pole

so

3.

Hold
net

by

Cartridge

4.20

4.20.1

1.

Remove
transducer

*Altemate

serial

the

two

the

interlock

so

that

will

maintain

rotate

face

of

the

that

its

long-pole

latch

against

so

that

latch

0.040

(±O.

In

SECTOR TRANSDUCER*

Sector
(Figure

Transducer

4-11)

CPU

lock

procedures

numbers

00001 through 00050,

screws

which

bracket.

magnet

magnet,

its

the

assembly

position

latch

and

face

the

magnet,

clears

the

010) inch, with

Place

(raised)

Index

signal

cable

screw

enough

are

contained

in

secure

Loosen

if

t6

contact

rotate

is

parallel

head

the

position.

Timing

from

so

Chapter

magnet

screws

can

be

not

disturbed.

the

the

to

and

position

of

latch

handle

Adjustment

machine.

that

transducer

7 for

machines

suffi-

moved,

long-

magnet

the

latch.

mag-

screw

in

the

Loosen

with

Timing Pulse

CE

Track 095

Head 00

CE

Track 095

Head

01

1-30flsec~4J

Figure

4-11.

Sector

can

be

positioned

still

locked

exerted

2.

Install

3.

Power

4. Using CE

5. Using a CE
scoping
reference

Observe

6.

to
The
pulse

the

delay

by
CE
up

pin

peak

to

the

the

- 5 flsec -

Transducer

by

sufficiently

the

tension

Cartridge.

the

machine

panel,

access
oscilloscope,
D3B07.

on

pin

K2B04.

time

delay

of

the

timing

from

the

timing

I

I III I

lL

I--

~

I V

I

If

---

I..

../

Index

Timing

the

adjusting

to

overcome

spring.

so

that

carriage

read

Synchronize

from

pulse

leading

pulse

edge of

should

10

flsec (Appro

Iffil

urn

VV

~I

~

,

III

+5

flsec

Range of acceptable

adjustment

Adjustment

for

screw,

the

heads

will

to

track

track

095

the

negative

referenqe

on

be

pulse

track

095.

the

reference

30 (±5)(J.s.

x)

both heads

but

is

force

load.

095.

by

NOTE:

bits

pattern

7.

Determine
of
that a time
both

8.

Use
the
time
crease
decrease
justing

The

timing

by

the

correction

read/write

the

transducer

transducer

delay.

the

the

screw

pulse

precedes

10(J.s.

the

magnitude

to

be

made

delay

of 30 (±5)(J.s

heads.

adjusting

to

increase

Turn

the

screw

time

delay

and

time

delay. One

provides a change

the

burst

and

direction

in

pulse

will

screw

or

decrease

clockwise

(+

timing

prevail

to

position

the

to

counterclockwise

turn

of

the

in

time

of

all

or

for

in-

to

ad-

delay

-)

so

227

-5984

(9/65)

4.23

of 78fiS.
while

making

NOTE:
this
is

9.

10.

4.20.2

Some

adjustment.

to

be

used

Power
ridge

and
secure
Repeat
and

readjust

Sector

down

the
steps 1 through 7 to

Replacement

1.

Remove

2.

Remove

3.

Back

off

4.

Remove
clamp

to

5.

Remove

6.

Remove
transducer

7.

Lift

transducer

baseplate.

8.

Replace

4

through

9.

Insert

CE

adjustment

4.21

DATA SEPARATOR

4.21. 1 Data
The

data

separator

various

signal

circuit

in

time

Observe

jitter

the

this

adjustment.

will

The

mean

be

as a reference

the

machine,

tighten

the

adjustment.

according

Transducer

all

ac

and

dc

cartridge.

adjusting

two

screws

binding

head

transducer

transducer

single

bracket

cable

binding

to

vertically

sector

transducer

7.
cartridge

and

according

Separator

Adjustment

circuit

tolerances

coincidence

scope

pattern

experienced

timing

setting.

remove

transducer

check

to

step 8 if

Removal

power

from

two

screws

bracket.

from

head

screw

baseplate.

to

remove

by

check

to

Section

is

adjusted

to

place

with

data

(Figure

in

making

pulse

position

the

CE

lock

screw

the

adjustment

required.

and

machine.

or

three

turns.

securing

transducer.

securing

from

reversing

Index

Timing

4.20.1.

(Figure

an

4-12)

to

allow

electronic

bits. A gate

cart-

to

cable

steps

for

4-11)

gate

signal

is

formed

separator
Data
quency
variable

justed

separate

card

information

signal. A 5K-ohm

600-nanosecond

to

achieve

The

process

oscilloscope
600-nanosecond
signal.
simpler,

from

justment

1.

2. Using

To

input

the

write

is

Set

up

the

a.

Adjust

b.

Adj

c.

Provide

SLT

to

D2J10, and

D2J09.

make

accomplished

ust

This
oscillator
fier.

3.

Connect
grounds

H3B07
the

oscillator

4.

Connect

external
oscilloscope

5.

Connect
output
display
Figure
Adjust

the

pin

the

4-12.

the

separator

Data

Gate

the

leading

shown

in

in

the

logiC

to

separate

from

the

this

purpose.

of

adjustment

traces

signle-shot

trace

stability

to

the

data

oscillator

OSCilloscope.

time

base

vertical

for

gain

external

jumpers,

connect

connects

test

point

tothe

to

any

CPU

clock

to

feed

signal

synchronization

to

Read

other

lead

C2B05.

dual

5K-ohm
card
pulse

Adjust

waveform

potentiometer

so

that

is

1040 (±20)

edge of the

Figure

4-12.

circuits

Read

Clock

composite

potentiometer

single-shot

involves

for

the

gate

signal

and

separator

test-point

in

the

following

for

200

nanoseconds/cm.

for

1. 0 v /

synchronization.

connect

Test

the

Test

Point
output
input

point

on

D3D08.

gate

and

to

the

read

Clock

output

to

the

600-nanosecond

synchronization

pattern

the

trailing

nanoseconds

Read

Clock

of

the

and

Read

double

in

circuit

displaying

output

of

and
triggering
is

received

outputs.

manner:

cm.

Point

H3B13

from

write

of

read

the

write
amplifier.

input

pin C2B03.

shown

on

the

edge

pulse

data

fre-

the

is

ad-

the

the

Ad-

H3B05

to

ampli-

This

on

the

to

in

data

of

the

as

clock

from

4.24

Read

Pin

Clock

C2J

12

Data
Pin

Gate

C2B05

1-<1J---1040

-4-----

(±20)

NS----..

1.8

(±

0.1) Volt

t

Data Separator 600

~;'~==~_

----------

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

--

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

-----------

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

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

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

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

-

---

idii,m,",

-------

5 K Ohm

NS

D

E
F

G

H

I

J

K

L

M

N

Single Shot

Figure

4-12.

Data

Separator

227-5984

(9/65)

Adjustment

4.25

5.1

POWER REQUIREMENTS

All

power

required

by

individual

disk

storage

drives

is

obtained

from

system

control

circuits

(Figure

5-1).

Those

machines

which

are

installed

within a

stand

alone

enclosure

(I/O

Unit)

are

connected

to

power

supply

circuits

which

are

an

integral

part

of

the

I/O

Unit. Although

internal

power

supply

circuits

may

vary

for

different

system

applications,

the

input

power

requirements

for

each

disk

storage

drive

is

the

same.

Details

of

power

supply

attachment

cir-

cuits

for

a given

system

application

are

covered

in

the

manual

of

instruction

for

the

respective

system.

5.1.1

AC

Input Supply

Power

Three

versions

of

the

Disk

Storage

Drive

contain

the

following

type

primary

ac

power

inputs

(Figure

5-2):

Internal

circuits

of

the

AC

box

located

on

the

front

of

the

machine

receive

ac

input

power

and

distribute

it

to

machine

components.

5.

1. 2 DC

Input Supply

Power

DC

input

power

requirements

for

the

Disk

Storage

Drive

are

contained

in

Figure

5-3.

DC

power

is

re-

ceived

by

the

machine

at

TBllocated

on

the

base

plate

at

the

rear

of

the

machine

from

where

it

is

distributed

to

machine

components.

Machine

Version

Use

Voltage

(ac) Tolerance

Type

I

Blower 115

:1:10%

Disk Drive 115

:1:10%

Type

II

Blower

208/230

:1:10%

Disk Drive

208/230

:1:10%

Type

III

Blower

208/220

:1:10%

Disk Drive

208/220

:1:)0%

CHAPTER 5 POWER

SUPPLY

Figure

5-1

Power Lines

Interface

5.2

POWER SEQUENCING

5.2.1

Power

On Sequence

All dc

voltages

must

be

at

the

specified

levels

before

ac

power

is

applied

to

the

drive

motor;

Blower

power

must

be

applied

when dc

is

on.

5.

2.2

Power

Off Sequence

Ac power

to

spindle

drive

motor

is

removed

before

removing

dc

power

to

machine.

5.3

POWER LINE INTERFACE

5.3.

1 Input

Power

Lines

to

Disk

Storage

Drive

Input

power

lines

to

the

Disk

Storage

Drive

are

shown

in

Figure

5-1.

Phase Frequency (CPS)

Current

Single

60:1:

1/2

Single 60:1:

1/2

3 Amp,

Start/1

Amp,

Run

W Amp,

Start/1.S

Amp,

Run

Single

60:1:

1/2

Single

60:1:

1/2

2 Amp,

Start/O.S

Amp,

Run

7.5 Amp,

Start/0.8

Amp,

Run

Single 50:1:

1/2

Single

50:1:

1/2

2 Amp,

Start/O.S

Amp,

Run

7.5

Amp,

Start/0.8

Amp,

Run

NOTE: A switch

located

on

the

rear

of

the

machine

is

attached

to

two terminals

and

is

used

to

control

the

disk drive motor by opening

and

closing a 4B-vdc

interlock

line.

The blower should

be

on whenever dc power

is

applied

to

the

2310.

~

Figure

5-2.

Primary AC Power Inputs

227-5984

(9/65)

5.1

Use

Signal Lines
Signal Lines
Control Circuits

Control ond

Interlock

NOTE:
Storage Drive,
applied

+48 vdc power
voltages being present.

Figure

Circuits

To

pre~ent

to

and

5-3.

DC Power Inputs

the
removed from
must

Voltage

(dc) Tolerance

-3V
+3V
+6V

+48V

damage

to

+3

vdc,

-3

never

be

:1:5%
:1:5%
:1:5%

:I:

B"k

internal circuits of

vdc,

and

file

+ 6 vdc pawer

at

the

same

without

the

applied

all

Current

0.3

0.3

0.4
3;OAmp

the

2310 Disk

must
time.
other dc

The

Amp
Amp
Amp

be

5.2

6.1

GENERAL

This

chapter

trations

of

consists

the

Disk

of

general

Storage

arrangement

Drive

which show

illus­equip-

ment

locations

support

the

manual and

plishing

within the

procedures

serve

maintenance

CHAPTER

machine.

described

as

an

aid

operations.

in

to

6 LOCATIONS

These

other

chapters

the

CE

illustrations

of

for

accom-

227-5984

(9/65)

6.1

Electronic

Gote

Assembly

,

I

~

Cover

Cover

Receiver

Cartridge

Cartridge

Door

Cartridge Guide

Opener

Pin

Motor Assembly

Fio;nlre

6-1

Disk Stota-<e

Drive,

Head

Load

Solenoid

Carriage

Detent

Assembly

Arranl(ement

Drive Motor

of

Components

Motor Drive

Pulley

~~-:i-

-~

- ,

J";;::::=-"':-",----:;--AC

Seal

Plenum
Plenum

- Spindle Drive

Pulley

" - Drive Belt

Fi

Iter

Cover

Receiver

Handle

Sector Transducer

Transducer

Adjust Screw

Box

6.2

_~1

__

4

__ ~ _______ 3 ______

~

________

2

________

~

__

~

Interlock &

Tachometer

Cable

Transducer

100

Ohm

20 Mil

Integrator
Set
Adjustment

100 Ohm

Level Dead
Band

Adjustment

CE

Switch

& Head Load

Cable

Cable

M

CPU

Cable

I"'"

-,

I I

I I

. I

I I

I

TS

I

I I

I I

I I

C

I I

Line Driver

2 CPU

& Term

Data

Separator

: I

L_J

Read Amplifier

Write Driver

F

G

r-

-,

I I

I I

H

I I

I

p7

~

1.4

MC

Oscillator

& Trigger

& Preamplifier

Line

Cable

Driver &

1

Term

r-

-,

I I

I I

I I

I Tl I

I I

I I

I I

I I

L_J

SK

Ohm

600ns

Single Shot

Adjustment

2K Ohm

Tacl,ometer
Adjustment

2K

Ohm

I

ntegrator

Adjustment

Balance

10

Mil

Set

I I

I I

I

I

__

J

K

r--,

I I

I I

L

I :

I

TS

I

I :

I I

I I

L_J

N

Voltage

Power

Interlock

Transducer

Regulator

r--'

I

I

I

I

1T4

I

I

I

I

I

I

L_

48 v Connector

Figure

6-2.

Arrangement

227

-5984

(9/65)

of

SLT Cards

in

Electronic

Gate

-3,
Gnd

+3,

+6

and

Connector

DC

6.3

Ground

GI

Ground

G2

Notes: X

Figure

Terminal

Sw

2 - Top,

6-3.

AC Box, Location

Blk

Sw

1 - Under

of

Sw

2

Components

Timing Motor

l4-HiI------

---

Motor Relay

317485 Terminal

(2)

Blk

6.4

7.1

PURPOSE OF

This

supplement

which

are

used

chines

This
located
as

containing

supplement

in

asterisk

other

applicable
this

chapter.

7.2

ALTERNATE

7.2.1

Two
in

Identification

different

the

field.
functionally,
required
chines
serial
plate,

for

can

numbers

below

Machines

through

which

this

00050,

are

maintained
chapter.
Machines

and

upward,

cribed

7.

Special
for

00050

Feeler

Feeler

Head

Disk

The
to
by
present

in

other

2.2

Special

tools,

machines

are

Gage,

Gage,

Alignment

Run

Out Gage

Disk

Run

determine

measuring

at

as

SUPPLEMENT

provides

to

maintain

serial

is

supported

chapters

and footnote

to

the

alternate

MAINTENANCE FEATURES

designs

Although both

separate

various

be

identified

stamped

the

drive

with low

contain

with

high

are

maintained

chapters.

Tools

which

containing

follows:

non-magnetic

non-magnetic

Oscilloscope

(PiN

Out Gage

the

extent

the

amount

the

outer

edge

alternate

Disk

numbers

of

the

for

machine

procedures

of

Machines

of

the

disk

machines

maintenance

mechanical

by

high

on

the

magnet.

order
differences

by

instructions

order

by

are a part

serial

(0.002

(0.005

Adapter

2200002)

(Figure

of

warpage

of

vertical

of the

CHAPTER 7 SUPPLEMENT

instructions

Storage

00001

by

baseline

manual

Drive

through

information

which

contain

ma-

00050.

differences

storage

are

instructions

assemblies.

order

edge of

serial

numbers,

in

described

serial

numbers,

instructions

of

the

numbers

inch)

inch)

7-1a)

enables

present

described

drive
the

and

low

the

design

shipping

00001

(PiN

(PiN

(PiN

in

exist

same

are

Ma-

order

base

00001

features

in

00101

des-

group

through

2200006)

2200007)

2200052)

the

CE

in a disk

deflection

disk.

FOR ALTERNATE MAINTENANCE INSTRUCTIONS

The

Disk

Run

Out

gage,

used

for

serial

numbers

shape

and
Chapter
and

its

2,

use,

This

to

the

head
manually
of

the

gage. A knurled

permits

adjusting
Procedures
Section

7.2.3

The

4.2.3.

Branch

following

part

although

is

gage

is

arm

rotated

for

Office

tools

00001

through

number

than

its

attachment

identical.

mounted

assemblies,

between

adjusting

the

gap

using

the

Tools

are

available

00050,

the

gage

specified

to

on

the

base

so

that

the

the gap on adj

screw

to

determine

gage

are

described

at

the

machines
has a different

the

plate

disk

ustable

on

runout.

Branch

base

adjacent

can

the

in

with

in
plate,

lips

gage

Office:

Disk

CE
This

Disk
This

7. 3

7.3.1

The
sections,
movable
through

1.

2.

Cartridge

tool

is

identical

Cleaning
tool

is

identical

PLENUM COVER AND

Plenum

complete

one of which

section

which

Remove
Remove
securing

these

screws

Fixture

Cover

plenum

can

the

drive
eight

plenum

(PiN

2200001)

to

that

(PiN

to

that

Removal

cover

can

be

identified

spindle

belt.

(Refer

mounting

cover

secure

the

described

2200008)

described

FILTER

and

is

composed

be

removed.

pulley

screws

to

baseplate.

belt

in

in

Replacement

as

that

protrudes.

to

Section

(Figure

guard

to

Chapter

Chapter

of

two

The

re-

section

4.

1.

7-1b)

One

of

plenum

1. )

cover.

3.

The

4.

plenum

from

baseplate

Replace

cover

plenum

can

of

the

cover

now

be

machine.

by

reversing

lowered

Steps

vertically

1

and 2.

7.3.2

1.

2.

3. The

Plenum

Remove
Remove

air

Air

drive
plenum

filter

Filter

belt.

cover.

can

Removal

See

be

lowered

Section

See

Section

vertically

and

Replacement

4. 1. 1.

7.3.1.
downward.

be

2.

2.

227

-5984

(9/65)

7.1

Stationary

Lip

Figure

7-1a.

Disk Run Out Gage

4.

Replace

air

and 3.

WARNING: When

certain
filter
position,

particles
the
free

remove

7.4

7.4. 1 Blower

1.

2.

3.

that

the

and

base

plate.

leaks

can

to

be

blown into

plenum

tissue

cover
dampened

accumulated

BLOWER ASSEMBLY

Assembly

(Figure

Turn

Disconnect

strip

Remove

securing

off

all

located

three

blower

7-1)

blower

baseplate.

4.

The

blower

from

the

baseplate.

5.

Replace

2,

3,

blower

and

4.

filter

by

reversing

replacing

foam-rubber

If

this

result

which will allow

the

and

cartridge

with

particles.

Removal

ac

and

dc

power

motor

in

ac

box.

binding-head

motor

may

now

be

assembly

plenum

seal
seal

cartridge.

air

91%

Isopropyl

to

leads

mounting

mounting

lowered

by

reversing

steps

air

filter,

is

between

is

not

in

duct

with

and

Replacement

machine.
from

bracket

vertically

1, 2,

make

the

air

its

proper

foreign

Also,

clean

lint-

Alcohol to

terminal

screws

to

away

steps

1,

Bose

Plate

Mounting

Hole

NOTE:

assembly
is
in

7.4. 2 Blower

Same
does

7.5

7. 5. 1
The

bly

1. Shut off

There

is a gasket

and

electronics
properly
this

positioned

area.

Motor

as

Section

not

contain

ACTUATOR ASSEMBLY

Actuator

entire

may

be

Assembly

carriage

removed

all

power

cartridge.

2.

Disconnect

tacles

cable

3.

Unsolder

read/write

and

remove

receptacles.

home

with a different

tate

identification.

4.

Remove
from
which

tachometer

terminal

each

lead

Removal

4.4.4,
clamps

and

as a unit

switch

colored

strip

is

between

gate.

to

prevent

except

at

the

Removal

mount

to

the

head

the

clamp

leads

grease

leads
and

removed.

the

Be

excessive

and

Replacement

motor

end

rings.

of

the

as

follows:

machine

cables

which

and

and

drive

note

terminal

inlet

to

sure

this

installation

and

Replacement

actuator

and

remove

from

secures

mark

each

pencil

to

coil

from

Height

Adjustment

Screw

blower

gasket

openings

assem-

recep-

the

lead

facili-

leads

7.2

Drive Belt
T ens ion

Adjustment_--l~~~~+!1t.

Spring

Plenum

Cover

Drive Belt Plenum

Section

(Remove to

replace

Cover

Filter)

Belt

Drive
Tension
Adjustment
Screw

Figure

7-1b.

5.

Remove

load

plunger.

6.

Disconnect

door

between
guide

7.

Remove

unfasten
assembly.

8.

Removethe
which
base

9.

Lift
two dowel
the
bracket.

2310 Disk

retaining

solenoid

opener

actuator

located

tachometer

tachometer

secure

plate.

carriage

single

plunger

the

and

adjacent

five

the

drive
pins
dowel

Storage

ring

spring

remove

and

socket

actuator

in

carriage

pin

Drive

..

Bottom

from

and

slide

attached

the

shroud.

to

the

bracket

assembly

head

assembly

assembly

mounting

on

tachometer

View

of

pivot pin in

pivot

pin

to

the

cartridge

air

baffle

Remove

actuator

mounting

from

assembly.
screws

actuator

mounting

to

vertically

base,

mounting

Machine

head-

out

of

mounted

the

disk

screws

the

off

the

and

to

I

10.

7.6

7.6.1

1.

2.

3.

these

motion

Replace
through

readjust

DRNE

Drive

Turn
Push
extend.
Remove

leads

resulting

actuator

10.

if

MAGNET

Magnet

off

all

the

carriage

the

would

cause

in

Check

necessary

power

three

=~~+

uncontrolled

damage

to

assembly

head

load

(see

Removal

to

the

and

machine.

forward

binding-head

____

carriage

equipment.

by

reversing

adjustment

Section

as

7.8.2).

Replacement

far

as

mounting

it

Belt

Screw

steps

and

will

screws.

Guard

Pulley

2

CAUTION:
for

terminals

I

coil

after

227

-5984

(9/65)

Ensure

of

the

replacing

that

correct

tachometer

the

actuator.

leads

are

assembly

Reversal

matched
and

voice

of

NOTE:
the

electronics

filter

Access

from

gate.

can

gate

be

gained

by opening

to

the

gate

screws

and

removing

nearest

7.3

WARNING:
the

mounting
mounting
result.
smoothly out of
or

hammer
epoxy
magnet. When
place
particle

certain

be
respective

4. Slide

5. Replace

and 3.
the
Section

7. 6. 2

Adjustment of

be accomplished
installed.
could
alignment

The

actuator

provide a O.

net

spacer

Do

not

force

base,

With a

on

joints

binding

masking

bracket

the

tape

since

and magnet mounting

moderate

the

mounting

magnet

the

the

magnet

over

accumulation. When replacing the magnet,

that

mounting

counterbore

magnet

drive

horizontally away

drive

magnet

If

a new

magnet

magnet

7.6.2.

Drive

Magnet Adjustment

the

drive

whenever

This

adjustment

cause

distortion

of

the

carriage.

threaded

mounting

sleeve

bracket

0005-inch

which

is

located inboard on

bracket.

1. Remove

locknut which

the

mounting

secures

spacer.

2. Use a

feeler

clearance

gage to obtain

between

3. Tighten the locknut

ance

is

obtained and

the

magnet to

damage to

drive

spacers

force,

the magnet will

bracket.

since

this

could

face

plates

to

the

is

out of the machine,

the

flux gap to

spacers

are

seated

recesses.

from

by

reversing

is

installed,

adjustment

described

magnet (Figure 7-2)

a new

drive

of

prevents

the

base

binding which

and

result

located outboard on

must

be

positioned

clearance

the

after

replace

with the

screw,

and

the sleeve

the

spacer

the

O.

the

loosen

against

0.0005-inch

and

0005-inch

mounting

slide

coil,

Do

not
destroy

permanent

prevent

in

carriage.

steps

perform

in

magnet

drive

the

mounting

sleeve.

out of

would

slide

drop

their

2

is

to

is

in

mis-

the

to

mag-

the

the

clear-

screw.

the

4. Replace
2, and 3.
tighten
(refer

7.7.2

WARNING:
for

the

ment

and

spacing.

bolts

holding the

or

electro-magnet.

1.

Turn

2. Loosen
detent
screws
out rocking,

3.

Push
against
mounting
assembly

(±O.

or
detent

detent

assembly

Insert

mounting

at

this

time.

to

Detent

section

Assembly

7.

The only two CE

detent

assembly

the

electromagnet

Do

not,

under

springs,

off

all

power

three

socket-head

assembly

to

until detent

toward

registration

the

corresponding

base

(Figure

along

this

003) inch

is

formed

even pawl and a detent crown tooth of

rack.

(If

necessary,

align a crown tooth of detent

Tighten the

to

secure

4. Check

step 3 if

5. Remove
that

C E switches

three

this

adjustment.

adjustment

necessary.

CPU

signal

socket head mounting

can

accessing.

6.

Turn

on

power

to

machine and

cartridge.

WARNING:
before

The CE

disk

continuing with the

by

Adjust

reversing

screws,

detent

steps

but

assembly

7.2).

Adjustment

adjustments

are

the
air-gap

any

circumstances,

spring

to

the machine.

actuator

assembly

and away

ledge of detent

7-3). Slide

(Figure

pawl-to-rack

alignment

post,

spring

cap

screws

assembly.

will

slide,

from

detent

assembly

edge of

carriage

detent

required

securing

edge until a gap of 0.007

made

cable

be

cartridge

between

in

used

move

rack

step

from

to

either

the odd

carriage

with a pawl. )

3.

Repeat

processor

control

insert

CE

must

be

procedure.

1,

do not

7-3)

align-

loosen

mount,

Loosen

with-

rack.

the

to

screws

so

disk

inserted

7.7

DETENT ASSEMBLY

7. 7. 1 Detent

1. Disconnect

Mark
moval

2. Remove
securing

Assembly

the

pin

to

facilitate

three

detent

detent

location of

socket-head

AND

DETENT RACK

Removal and Replacement

coil

leads

from

terminal

each

lead

prior

identification.

mounting

assembly

to

carriage

base.

3. Remove
away

7.4

detent

from

assembly

carriage

by lifting

assembly.

it

strip.

to

re-

screws

mounting

upward

7. Upon completion of
energized.
ensure

Give

carriage a slight

full engagement between

pawl.

8. Loosen
detent

9.

Use a fine blade
(serrated)
(Figure

and pole

# 0-80 nut

coil

using a 3/16-inch

screwdriver

portion

7-3) until

pieces

an

is

(Figure

of

within
inch width. Use non-magnet
this

air

gap

measurement.

sive

force

on

the

adjustment

step

6, one

the

gap-adjuster

air

gap between

O.

detent

push to

rack

7-3) on

the

End Wrench.

to

turn

004 (+

O.

shims

Do

not apply

because

coil

is

and

detent

energized

the

knurled

nut

the

clapper

001,

-0.

to check

exces-

too much

002)

Spacer

Drive Magnet

Mounting
Screw

(2)

Figure

7-2.

force

will
clappers
proper

gap

applying

NOTE:

can

be

applied

wrench

The
right

10.

with

170

angle

Set
steps.
move
other

the

11. Move

tact

12.

Repeat

13.

Turn

14.

Replace

NOTE:
a

CE

Cartridge

the

detent

Drive

Magnet

cause

deflection

resulting

is

achieved,

15

to

20 inch-Oz of

The

required

by

170

to

to

225

gram

to

the

the

CE Step Mode

Using
carriage
detent

pawl

rack.

carriage

between

Steps

off

all

power

CPU

The

Read/Write

installed

assembly

Adjustment

in

an

15

loading

225

load

shaft

the

CE Step

one

should

slightly

pawl

and

8 and 9

signal

has

of

the
uneven
tighten

torque.

to

20 inch-Oz of

the

free

grams,

must

of

the

end

switch

Control

track

(0.

now

to

check

rack

for

the

to

the

machine.

cable

on

head

must

after

.each

been

accomplished.

spring
gap.
the

When

#0-80

supported

nut

torque

end of

the
using a gram
be

applied

at

wrench.

to

10

milli-inch
switch,

010-inch).

be

engaged

for

good

engagement.

second

detent.

processor.

be

adjusted

adjustment

the

by

end

gage.

a

The

with

con-

--+10-1

with
of

"""*--

Base

15.

7. 7. 3

Adjust for

Plate

Adjust

Detent

Removal

1.

Remove

7.7.1).

2.

Remove
that

carriage.

3.

Lower

Replacement

1.

Place

Figure
contact
detent

(Refer
ment).

2.

Install
secure

3.

Check
spacing

read/write

Rack

detent

two

secure

detent

detent

7-4.

between

rack

to

section

two

the

detent

and

0.0005"

Clearance

head

Removal

assembly

binding-head

detent

rack

rack

to

rack

in

Press

upward

registration

and

registration

7.

7.4

binding-head
installation.

adjustment

detent

alignment

(See

and

(Refer

mounting

(Figure

remove

position

for

details

mounting

by

Section

7.15.1).

Replacement

to

section

screws

7-4)

to

from

carriage.

shown

in

on

rack

to

surfaces

ledge

on

carriage

of

adjust-

screws

observing

with

the

rack.

the

ensure

on

to

clapper

227

-5984

(9/65)

7.5

Gap

Between Clapper
and Pale Piece of
Energized Detent

0.004"{+0.00l;"0.002")--I~"

Clapper (

__

_ .....

I~_

Gap

between
De-energized
Pawl

and

0.007 ± 0.003"

Rack

Knurled

Gap

Adjusting

Screw

(2)

Registration
of Detent

Mounting Screw

Figure

Ass

••

7-3.

Detect Assembly, Adjustment

mblv_

{3'------"\

~--------.Even

-------Spring

-mr---------_Spring

Detent

(Energized position)

Rack

r----

___

Pawl

K.Jck

Mounting Screw

Post

Mount

(2)

4.

Realign

Read/Write

head.

(Refer

7.15.1).

5.

Adjust

Crash

stops

(Refer

to

section

4.10.2).

6.

7.

Adjust
Replace

Home

detent

Switch

assembly

(Refer

to

section

(Refer

to

7.7.1).

7.

7.4

Detent

NOTE:
is

accomplished

be

loosened

on

the

carriage.

7.6

Rack

Adjustment

during

or

readjusted

Adjustment

of

the

detent

replacement

after

rack

it

is

and should
initially

to

section

4.

10. 1 and

7. 11. 2).

section

(Figure

7-4)

never

installed

When a
right
tent
the
surfaces
lish a flush
carriage.
tightened

detent

end

(as

assembly)

right

end
of

The

to

rack

viewed

should

of

carriage.

detent

contact

two

secure

is

replaced

from

be

flush

rack

must

with

the

mounting

the

detent

the

The

registration

7. 8 HEAD LOAD ASSEMBLY

7. 8. 1 Head

1.

Turn

off

Load

all

Solenoid

ac

and

Removal

dc

power

(section

direction

(:I:

O.

001-inch) with

top

registration

be

pressed

screws

rack

alignment.

to

machine.

7. 7. 3),

of

the

to

ledge

must

be

and

Replacement

its

de-

estab-

of

Figure

7-4.

2.

Remove

TB4 (pins 7

Remove

3.

4.

Remove

solenoid

5.

Slide
to

effect

6.

Replace
steps 1 through

(section

7.8.2

Head

WARNING:
rotating
machine,
to

loading.

damage

1.

2.

3.

NOTE:
second
ing

to

Remove
on

machine.
Install
Power
of

heads.

Read/Write

delay.

procedure

Detect

solenoid

pivot

two

to

solenoid

removal.

the

7.8.2).

Load

Do

in

machine.

insert

Failure

heads

CPU

a CE

up

Rack,

Removal

and

8).

pin

binding

mounting

horizontally

head

5.

Assembly

not

load

an

IBM

to

and/or

signal

cartridge

the

machine

heads

If

heads

to

accomplish

Registration Surfaces
on

Detent

and

leads

from

from

solenoid

head

screws

bracket.

load

solenoid

Readjust

Adjustment

heads

when

When

cartridge

card

between

comply

disk.

cable

in

machine.

and

should

fail

to

head

Rack

Replacement

terminal

plunger.

away

from

by

head

disk

will

result

from

plug

check

for

load

load,

use

loading:

Screws

strip

securing

bracket

reversing
load

assembly

(Figure

is

not

is

out

of

heads

prior

in

connection

loading

after a 90-

the

follow-

Mounting

(2)

7-5)

a.

Observe
out.

b.

Shut off

c.

Loosen
secure
mounting

d.

Use
per
or
plunger
solenoid

O.

out,

O.

e.

Tighten

the

4.

Use

masking

switch

the

switch

switch

far

as

WARNING:

in

held
applied

transferred

to

equipment.

power

the

the

the

solenoid

turn)

backwards

has

031-inch.

move

031-inch.

the

adjustment.

in

the

mounting

backwards

possible.

If

the

solenoid

that

solenoid

to

machine.

two

binding

head

load

bracket.

adjust

to

move

in

the

bottomed

backwards

If

solenoid

solenoid

two

mounting

tape

to

hold

transferred

screws

toward

Hcads

Loaded

position,

coil

resulting

plunger

head

solenoid

screw

the

solenoid

bracket.

out,

move

approximately

has

not

forward

approximately

screws

the

heads

position.

and

slide

the

solenoid

switch

'18

vdc

will

in

damage

has

screws

to

the

(0.

031-inch

forward

If

solenoid
the

bottomed

to

loaded

Loosen

the

as

is

not

be

bottomed

that

secure

to

227

-5984

(9/65)

7.7

Head

load

Solenoid

Base

Figure

7-5.

5. With
the
noid
ward
loading
to
all
the

solenoid
solenoid.

Back

6.
and
mounting
ward

adjusting

7.

Check
loading
within

mounting
obtained.

8.

Access

mirror

0.010
loading
at
ism

Plate

___

Head

the

two

adjusting

until

slide

the

solenoid

off

tighten

so

0.030

inch

track

between

J

Load

Assembly

carriage

solenoid

screw.

the

pivot

roll

pin

the

solenoid

way

into

mounting

adjusting

the

solenoid

the

screws

that

it

screw.

clearance

roll

pin. This

(±O.

screws

the

carriage

to

check

between

roll

pin

199.

This

the

Pivot Bracket Mounting Screw

Adjustment

detented

mounting

at

screws

Slide

plate

contacts

in

the

head

back

until

the

cam

followers.

screws

screw

against

adjusting

lock

nut.

Loosen

and

slide

the

will

bear

lightly

between

the

clearance

010) inch.
after

this

to

track

for a minimum

the

pivot

while

the

carriage

check

determines

carriage

rail

track

and

the

solenoid

the

load

cam.

the

cam

and

position

the

screw

the

solenoid

against

pivot

plate

should

Tighten

clearance

199.
clearance

plate

and

and

pivot

Heads-loaded

000,

loosen

the

sole-

back-

head-

Continue

moves

Tighten

the

back

of

the

one

turn,

solenoid

back­the

and
be

the

solenoid

has

been

Use a dental

of

the

head

is

positioned

parallel-

plate.

Solenoid Mounting Bracket

9. Shut down
carriage

10.

stops.
of
head

If

plate

There

0.010
unloading

conditions

and
apparent,
bracket
is

to

accomplished
mounting
loosening
each,

and

in

the

proper

NOTE:
to
obtain

11.

move

the

Repeat

It

may

the

rear

O.

010

steps 5 through

adjustments

12.

Adjust

heads
procedure.
a.

Slide

against

move

Solenoid
Screw and
locknut

the

machine

between

should

inch

between

roll

of

roll

pins

it

will

obtain

screw

the

rear

tapping

direction

be

necessary,

end of

inch

have

loaded

switch

the

the

masking

Adjust

and

the

forward
be a minimum

the

pin

for

parallelism

in

steps

be

necessary

the

required

by

first

loosening

of

the

pivot

mounting

the

forward

to

the

pivot

clearance

9

not

been

switch

toward

head

head

load

tape.

manually

and

pivot

all

carriage

between

8 and 9

to

clearances.

bracket,

screw

end of

obtain

in

some

bracket

for

parallelism.

to

ensure

altered.

using

load

actuator

move

rear

crash

clearance

plate

and

positions.

the

pivot

are

not

adjust

the

the

forward

then

1/8-turn

the

parallelism.

instances,

also,

that

other

the

follOWing

contact

link and

the

the

pivot
This

bracket

to

point

re-

7.8

b.

Place

a

O.

005

inch

shim

between

c.

CA UTI
hand
is

warm

24

vdc
adjustment
coil

resulting

too

hot

is

not

13.

Adjust
is

section

14.

Power

button
bottoms

in

to

in

excessively

and

link.

out.

Tighten

ON : Feel

inspect

is

to

mounting

this

position.

the

head

for

overheating.

to

the

touch

during

applied. A defective

will

cause

48

in

excessive

grasp

and

hold,

proper

the

adjustment.

heads

loaded

hot

(refer

7.8.3).

down

the

machine.

Move

screws

loaded

vdc

heating.

the

switch

to

switch

to

solenoid

The

normal

Heads

to

be

heads

if

procedures

7. 9 HEAD LOAD SPRING ASSEMBLY

NOTE:

spring
Chapter
assembly
is

Removal

assembly

4. Do
whenever a new

installed.

is

not

and

the

replace

replacement

same

as

the

counterbalance

head

load

of

described

spring

switch

until

secure

solenoid

operation

Loaded

applied

If

the

loaded

solenoid

the

head

in

assembly

it

switch

coil

by

when

Switch

to

the

coil

switch

coil

of

load

spring

coil

is

7. 10 CRASH STOPS

NOTE:
as

7.10.1

Use
ate
track

Adjustment

described

Rear

appropriate

carriage

000

against

in

Section

Crash

switches

in a reverse

rear

magnet).

NOTE:
switch
stop

and
clearance

It

may

out

of

adjustment.

Adjust

tighten

screw
locknut

exists

be

the

necessary

way

on

between

carriage.

Operate

then

reverse,

clearance

stop

when

~':;OTE:

adjustment
justed

adjustment

carriage

If

the

of

as

described

carriage,

to

check

Home Switch
the

rear

of

front

4. 10.

Stop

Adjustment

on
direction

crash

to

accomplish

left

end of

so

that a 0.003;

rear

first
that

the

is

maintained

is

detented

was

crash

in

Section

crash

1.

the

stop

to

move

crash

in

forward

0.003,

on

moved

stop,

7.11.

CE

(near

rear

track

stop

Panel

to

the

crash

(±O.

stop

at

it

2.

is

the

to

detent

drive

the

home

rear

001)
and

direction

(±O.

the

rear

000.

to

accomplish

must

on

crash

stop

inch

001)

be

same

oper-

and

inch

crash

read-

7.9.1

Head

Load

Spring

NOTE:
installed
replaced
stalled
those

The

head

on

all

whenever a new

on

machines.

machines

counterbalance

Adjustment

of

accomplished

1.

With

heads

2.

3.

spring
spring
Check
off of
tab
force
(±1)
ated
the

Repeat

is

perpendicular
support.

the

the

on

the

is

grams

counter

mounting

step

maintained.

Spring

Adjustment

load

machines,

which

spring.

the

counterbalance

as

follows:

unloaded,

force

required

head.

This

spring

not

4 (±1)

at

the

balance

screw

2 to

ensure

Assembly

counterbalance

and

this

head

load

These

procedures

still

incorporate

spring

position
to

the

side

to

lift

force

is

which

contacts

grams

bottom

spring

to

deliver

at

head,

that

the

at

the

Counterbalance

spring

spring

spring

the

counterbalance

of

the

measured

the

top

form

the

the

required

is

is

not

is

in-

apply

the

head

is

to

the

head

spring

head.

head,

the

bend

nearest

required

to

be

at

and 9

associ-

force

not

to

be

load

load

support

the

If

this

force.

7. 11 HOME

7. 11. 1

1.

2.

3.

Home

Remove

Remove
Remove
Switch

4.

Remove

to

mounting

5.

Replace

through 4 and
Section

7.11.2

1.

Home

Use

appropriate
operate
on

track

2.

Place
carriage
just

the

switch

SWITCH

Switch

all

leads

two

mounting

binding

Removal

ac

and

from

binding

bracket

head

dc

bracket.

Home Switch by

adjust

7.11.

2.

Switch

Adjustment

switches

carriage

in a reverse

001.

a

O.

007

-inch

and HOlne

Home Switch

just

transfers.

power

Home

head

to

screws

reversing

switch

feeler
Switch

adjusting

and

Replacement

from

Switch

screws

terminals.

securing

actuator

securing

according

on

the

CE

direction

gage

between

pushbutton

screw

machine.

bracket.

switch

steps

2

to

Panel

to

the
and
until

Home

to
detent

ad-

the

227 -5984

(9/65)

7.9

3.

Check

this

adjustment

with a O.

005-inch

feeler

gage

to

determine

that

Home Switch

will

not

transfer.

7.12

TACHOMETER

AND

TACHOMETER

EXTENSION ROD

7.12.1

Tachometer

Extension

Rod

Removal

1.

Remove

outboard

adjusting

nut which

secures

rod

to

carriage

arm.

2.

Loosen

inboard

adjusting

nut

sufficiently

to

free

rod

from

carriage

arm.

3. Slide

extension

rod

away

from

home

switch

and out of

the

tachometer

coil

and housing

assembly.

WARNING:

Exercise

care

to avoid bending

the

rod

or

scoring

the

core

as

rod

is

extracted

from

shield.

4.

Replace

tachometer

extension

rod

by

reversing

steps

1, 2, and

3.

7.12.2

Tachometer

Extension

Rod

Adjustment

The

tachometer

extension

rod

(Figure

7-6)

is

ad-

justed

so

that

when

the

carriage

is

dented

in

track

000,

the

shoulder

of

the

rod

protrudes

0.137,

Extension

Rod

Shoulder

flush

with end of

Carriage

End

of

Tachometer---·

....

1

Figure

7-6.

Tachometer

Extension Rod Adjustment

7.10

r " .

.

(±0.010)

inch

from

the

carriage

end

of

the

tachometer.

This

adjustment

is

performed

as

follows:

WARNING:

Use

extreme

care

to

avoid bending

the

tachometer

extension

rod

while

making

this

adjust-

ment.

1.

Detent

carriage

to

track

000.

2.

Loosen

the

two

locking

nuts

where

rod

attaches

to

arm

extending downward

from

carriage.

As

a

point

of

reference,

advance

the

inboard

nut.

This

will

push

the

extension

rod

further

into

the

tachometer.

Continue

this

process

until

the

extension

rod

shoulder

is

flush

with

the

end

of

the

tachometer.

NOTE:

This

distance

can

be

judged

within

O.

OlD-inch

by

eye

(See

Figure

7-6).

3.

Back

off

the

inboard

nut

by

5-1/2

turns

from

the

reference

position

obtained

in

step

2.

Since

the

nut

advances

O.

025-inch

per

revolution,

the

total

movement

will

be

0.137

inches.

4.

Hold

the

inboard

nut

firmly

to

prevent

rotation,

and

tighten

the

outboard

nut. In

accomplishing

this

step,

apply

sealant

(PiN

2111360) to

secure

the

adjustment

from

vibration.

If

the

assembly

is

equipped with

an

outboard

lockwasher,

omit

the

use

of

sealant

to

secure

the

adjustments.

5.

Check

the

carriage

binding

the

7.12.3

does

not

tachometer

Tachometer

prevail

extension

Assembly

Replacement

1.

Remove

2.

Remove

spindle

3.

Unsolder
on

facilitate

4.

Remove

section

WARNING:

tachometer
rod

can

5.

Remove

mounting
bracket)

6.

Slide

ing

7.

Slide
out

WARNING:
end

of

not

bend

since

they

disk

cartridge

from

tachometer

tachometer

identification.

tachometer

7. 12. 1.

Caution

core

be

bent,

two

base

which

tachometer

base

and

tachometer

of

tachometer

Slide

tachometer

tachometer

can

break

cartridge

baseplate.

bracket.

must

and

extension

and

core

set

screws

and one

secure

tachometer

coil

shield

electrical

within

assembly.

8.

Replace

steps 2 through
section

the

tachometer

7.12.2.

7 and

7. 13 CARRIAGE RAIL

7.13.1

1.

2.

Carriage

Turn

remove
Loosen
play

of

off

all

top

two

rail,

Rail

ac

and dc
baseplate
set

screws,

sufficiently

movement.

3.

Insert
carriage
preload
of
avoid

O.

100-inch

preload

force

the

carriage

misalignment.

on

the

mounting

for

friction

from

receiver,

leads

extension

be

broken

located

the

shield

coil

and

shield.

and

housing

nearest

the

adjust

Removal

power

cover.

feeler

spring

rail,

as a result

rod

adjustment.

Removal

machine.
shroud,

from

Mark

each

rod

exercised

rod.

if

(one

located

in

tachometer

out

of

carriage

bracket.

housing

assembly

the

leads

coil

assembly

according

and

to

the

which

eliminate

to

allow

gage

shim

and

carriage.

and

slide

base

being

to

ensure

of

making

that

and

and

terminal

lead

to

according

in

handling

The

extension

dropped.

in

carriage

tachometer

shield.

mount-

assembly

out

spindle.

back

and

by

and

forth

housing

reversing

Do

to

Replacement

machine

side-

the

rail

free

between

Remove

the

rail

careful

strip

to

the

and

the

out
to

WARNING:
the

carriage

4.

Replace

NOTE:
carriage
riage
ciently
until

movement

7.14

7. 14. 1

Misalignment

bearings.

carriage

After

carriage

rail

for

movement

motion.

tighten

If

set

any

screws

disappears.

CARRIAGE SUBASSEMBLY

Carriage

Subassembly

Replacement

1.

2.

3.

4.

5.

6.

Remove
Remove

Loosen
clamp
plugs
Remove
(section

Unsolder
from
Remove
carriage

all
Drive

binding

to

release

from

head

tachometer

7.12.2).
voice

which

two

outrigger

ac

and
Magnet

each

binding

slide.

7.

Remove

8.

Lift

carriage

WARNING:

read/write

carriage

carriage

mounting

Caution

heads

assembly

do not

removal.

9.

Replace

carriage

steps 2 through

WARNING: When

slide,

be

certain

is

parallel

carriage

10.

11.

mounting

Adjust
to

section

Adjust

to"

tachometer

head-arm

section

12.

Perform

carriage

a.

Check

necessary

replacing

that

the

vertical

base.

7.12.1.

7. 15. 1.

the

following

subassembly

detent

according

in

rail

by

rail

has

in

movement

located

dc

power

(section

head

screw

head

plug.

cables.

extension

coil

leads

lead

is

head

slide

rail

(Section

vertically

base.

must

be

strike

subassembly

7.

the

the

slide

surface

extension

assemblies

adjustments
has

adjustment

this

step

reversing

been

the

direction

is

apparent,

in

Removal

to

machine.

7.6.1).

securing

Disconnect

rod

and

note

removed.

screws

to

carriage.

7.13.1).

exercised

anything

by

plastic

does

not

of

rod

according

been

installed:

and

to

section

could

steps

replaced,

the

rail

and

head

from

terminal

securing

Remove

away

to

ensure

during

reversing

outrigger

touch,

its

guide

according

to

if

a

new

readjust

7. 7. 2.

damage

2 and 3.

test

of

car-

suffi-

supports

plug

head

carriage

from

that

and

in

the

if

227-5984

(9/65)

7.11

b.

c.

Adjust

to

Adjust

front

section

home

7.11.2.

7.15

HEAD-ARM ASSEMBLY

7. 15. 1

NOTE:

heads

obtain
Section

numbers

The
accessible
requires
access

Head-Arm

The

by

using

the

oscilloscope

4.

17. 1

00001

location

that

to

this

requirements

track

are

through

of the

from

the

screw.

Procedures

assembly

1.

are

Remove
ing

to

to

the

as

drive
procedures
head

adjusting

and

4. 10.
switch

Assembly

100 of

identical

head

inside

drive

for

adjustment

follows:

magnet

of

rear

crash

according

Adjustment

for

aligning

the

display

for

00050.
adjustment

the

voice

magnet

from

section

screws.

stops

OE

cartridge

patterns

machines

screw,

coil

be

removed

of

the

the

actuator

7.6. 1 to

according

to

section

read/write

Figure

with

which

(Figure

to

head-arm

gain

to

4-8,

serial

7-7)

gain

accord-

access

is

2.

Torque
pound-inches.

3.

Back
each
coil
potted
is

required

4.

Install
machine
carriage
the

even

NOTE:
gize

still

Operate

the

even

positioned

rack.

5. Allow
continuously
temperature
fore

6.

Scope
play 5 ms/
40

ms).

Negative

both

off

the

head-arm

until

the

capsule

the

CE

to

load

to

detent

detent

at

the

machine

adjusting

from

cm
Synchronize
Reference,

head

clamping

head

adjusting

assembly

head

load

on

the

to

observe
cartridge

heads.

track

100

coil.

the

CE

Step Mode

coil.

CE

track

and

for

15

minutes

stabilization

heads.

Pin

D3B07.

(one

revolution

screws

screws

back

toward

spring

just

head. A dental

the

lower

head.

and

apply

Manually

and

detent

move

by

switch

Ensure

cartridge

the

Pin

that

100

when

to

ensure

has

taken

Set

time

of

oscilloscope

K2B04.

detent

to

base

the

to

3.5

(±1.

and

push

the

voice

clears

the

mirror

power

to

the

energizing

to

ener-

carriage

engages

operate

that

place

be-

to

dis-

disk

is

on

0)

the

is

Present
(Approx)

Voice

Head Adjust

Screw

Figure

Coil

7-7.

0.200"

(2)

Head

__

Arm

-.!

Assembly

Detent

located

Adjustment

Clamping Screw

Head 1

Carriage

at

Track 100

Head

Positioned
to Read on
Track 100

CE

7.12

7.

Insert

(P/N
socket
Head

8. Slowly
observing
first

Figure
erlyaligned,

will

be

amplitude.

NOTE:
the

If

spindle,
machine,
arm

backwards

step

3,

then
assembly
head

load

the

arm

assembly
spring
capsule

It

slightly
using

9.

will

Back

will

which

be

if

step

when

the

scope

head

10.

Use

the

steps 2 through

NOTE:

If

adjustment
necessary
home

switch

sion

rod

(section

11.

Replace

7.6.1)
sockets.

the

Head

2200052)
for

head

Select

switch.

advance

the

show

noise

4-8

will

the

present

the

head

it

will

remove

the

toward

repeat

is

correctly

spring

not

be

will

in

encases

necessary

correct

8.

off

the

head

adjustment

display

alignment

CE

switch

the

detent

of

the

head-arm

to

readjust

(section

7.12.2).

drive

and

connect

Alignment

between

O.

Select

the

head

scope

pattern.

only,

then

appear.

pattern

and

the

is

moved

be

necessary

CE

cartridge,

the

voice

step

8. When

positioned,

bear

on

spring.

The

contact

the

read/write

to

shift

adjustment

adjusting

has

been

pattern

is

not

affected.

to

select

9.

rack

was

the

crash

7. 11), and

magnet

on

head

Oscilloscope

the

head

head 0 with

adjusting

The

the

When

of

View

lobes

will

forward,

to

coil

the

the

the

dimple

head

with

the

cable

pattern
the

shut

and

as

load
plotted

Adapter
plug
the

screw

while

scope

of

head

is

B,

Figure

be

equal

too

far

down

push

described

head-arm

lip

of

the

of

and

CE

will

View

prop-

4-8

in

toward

the

the

coils.

the

detent

cannot

completed.

to

moved

assemblies,

the

cables,plugs~and

rack

be

made

screw

one-half

ensure

Head

stops

that

1,

to

accomplish

(section

tachometer

actuator

Observe

the

and

repeat

it

will

exten-

(section

turn

be

4. 10),

in

A,

3.

Remove
brackets

WARNING:

receiver

assembly

4.

Lift

cartridge

5.

Replace
steps 2 through

6.

Check
described
absolutely

7. 16. 2

NOTE:

Cartridge

The

completed
cartridge
gage

for

adjusting
cartridge
it

should

not

Adjustment

1.

Loosen
pivots
is

free

(Figure

Pivat

Brac

ket

4.581"

Reference

I

both

from

Exercise

from

machine

and

disrupting

the

cartridge

the

cartridge
in

necessary.

cartridge

prior

to

interlocks.

receiver.

be

changed

is

to

be

both

self

of

the

cartridge

to

move

7-8).

(2)

cartridge

baseplate.

care

to

avoid

the

receiver

4.
receiver

section

7.

Receiver

receiver

attempting

Any

the

side-to-side

After

unless

accomplished

locking

slightly

(2)

Locknut

receiver

in

lifting

support-pivot

the

striking

detent

adjustment.

from

machine.

receiver

by

adjustments

16.2.

cartridge

Readjust

Adj

ustment

adjustm~nt

an

adjustment

serves

position

this

adjustment
trouble

as

follows:

nuts

located

receiver

so

in a sidewise

-~-

: I

cartridge

the

detent

reversing

only

must

of

as

of

the

is

made,

is

suspected.

on

the

that

receiver

direction

,5.000"

(±

if

be
the
a

.

.010")

7.16

CARTRIDGE

7. 16. 1

Cartridge
Replacement

1.

Remove

2.

Remove
cartridge

227-5984

(9/65)

all

ac

tension

receiver

RECEIVER

Receiver

(Figure

and

dc

power

spring

and

Removal

that
interlock

7-8)

from

attaches

and

the

machine.

to

assembly.

Reference

Figure

7-8.

Cartridge

Cartridge

Receiver

Receiver

i\djmlmcnl

--+--L

Cartridge

Rest Pin

(2)

7.13

2.

Install a cartridge

each

side.

of

the

top

raised

portion

(near

the

on both

3. Shake
ways

4. With
in
locking
the
will

sides

the

until

the

its

preferred

nuts

cartridge

secure

NOTE: With
tridge
always
out

receiver

disturbing

7.17

INTERLOCKS

be

removed

If

rails

door),

front

it

front

the

this

and

the

and

there

is a gap

of

the

of

the

take

using

mM

of

the

assumes

of

the

cartridge

position,

until

they

receiver

adjustment.

adjustment

receiver

and

replaced

adjustment

check

between

receiver

front

top

up

this
cards

cartridge

its

preferred

tighten

just

contact

pivot

brackets.

established,
pivot

as

of

the

for

clearance

and

the

of

the

clearance

as

shims.

receiver

position.

receiver

the

surfaces

brackets

an

assembly with-

self

locking

on

the

front

matching

cartridge

equally

side-

located

two

self

of

This

the

car-

should

nuts.

Latch

Screw

Figure

1.

4-10)

Fully
position.

2.

Adjust
seat

into

3.

Determine
latching
face

of

the

latch.

obtain

4.

Tighten
has

been

Latch

Switch

Adjustment

section

Interlock

4. 19. 1.

Magnet

Clearance

rotate

handle

the

interlock

the

that

clearance

the

screw
Adjust

this

clearance.

locknut

made.

Adjustment

of

latch

Adjustment

Adjustment

to

the

latch

square-hole

0.040

(±O.

exists

and

upper

latch

on

latch

switch

is

Cartridge

screw

notch

010)-inch

between

edge

screw

screw

the

same

(View

so

of

the

the

of

as

necessary

after

as

B,

In

Place

that

it

will

latch.

overtravel

flat

sur-

notch

on

adjustment

to

7. 17. 1 Handle and

NOTE:
(section
ing

Handle Stop

The
a

clearance

surface)

plished

1.

2.

3.

4.

NOTE:

and

the

head

Remove

nal

The

7. 16.

an

adjustment

Handle

cartridge

of

Adjustment

as

Install

Loosen

Adjust

are

parallel

cartridge

Secure

adjustment

At

bracket

next

several

screws

wire

block

cartridge

2)

must

Screw

stop

screw

is

in

place,

with

the

the

cartridge.

of

follows:

CE

Cartridge

handle

the

handle

with,

by

locknut

is

discretion

assembly

adjustments.

which

connections

(TB6).

reassembly.

Interlock

receiver

be

of

the

(View

must

outer

the

handle

stop

screw

stop

and

O.

060

(±O.

on

handle

obtained.

of

may

secure

Mark

Adjustment

adjustments

completed

cartridge

A,

Figure

be

the

handle

edge

in

machine.

prior

interlocks.

4-10)

adjusted

risers

(vertical-cylindrical

stop

screw

locknut.

screw

so

clear

the

030) inch.
stop

screw

the

CE,

the

be

removed

Remove

bracket

at

each

pins

pin

to

3 and 4

location

(Figure

to

so

will

is

,that

handle

outer

edge

after

interlock

to

accomplish

the

the

baseplate.

from
to

4-10)

attempt-

that

when

have

accom-

risers
of

this

handle

two

flat-

termi-

facilitate

the

Adjustment
section

4.

of

19.1.

the

interlock

magnet

7. 18 SECTOR TRANSDUCER

7. 18. 1

1.

2.

3.

4.

5. Using CE

6.

NOTE:
all

7.

8.

Sector

(Figure

Remove
Install

Power
Using

CE

scoping
reference
Observe

to

the

peak

The

delay

pulse

to

The

bits

pattern

Determine
of

the

correction
that a time
both

read/write

Power

Transducer

7-9)

CPU

signal

CE

Cartridge.

up

machine
panel,
oscilloscope,

pin

D3B07.

on

pin

the

time

of

the

from

the

timing

timing

pulse

by

10p,s.

the

magnitude

delay

down

machine

Index

cable

so

that

access

Synchronize

K2B04.

delay

from

timing

the

leading

pulse

precedes

to

be

made

of 30 (±5)p,s will'

heads.

and

cartridge.

Timing

from

heads

carriage

read

track

reference

pulse

edge

should

and

direction

in

remove

is

the

machine.

will

to

track

095 by

the

on

track

of

the

be

30 (±5) p,s.

the

burst

pulse

prevail

CE

same

as

Adjustment

load.

095.

negative

pulse

095.

reference

of

the

(+

or

-)

timing

so

for

7,14

9. With
loosen

10.

Use
to

position
the
increase
decrease
ing

11.

Install
observe
verify

30 (±5)/-ts.

the

cartridge

the

transducer

the

transducer

the

time

delay.

the

time

the

time

screw

provides a change

the

CE

the

scope

that

timing

handle

lock

adjusting

transducer

Turn

the

delay

delay.

cartridge,

pattern

adjustment

in

the

open

screw

(Figure

screw

to

increase

screw

clockwise

and

counterclockwise

One

turn

in

time

power

up

(Figure

is

within

4-11)

position,

7-9).

(Figure

or

decrease

of

the

adjust-

delay

machine

to

limit

7-9)

to

to

of 78/-ts.

and

of

NOTE:
this

adjustment.

is

to

be

12.

Power

cartridge
screw

13.

Repeat
ment
through

Some

jitter

will

The

mean

used

as a reference

down

the

machine,

and

tighten

to

secure

the

steps 1 through 7 to

and

readjust

10

if

required.

be

experienced

timing

setting.

remove

the

transducer

adjustment.

according

pulse

check

to

setps

in

position

the

lock

the

8

making

CE

adjust-

Sector

Figure

7-9.

Transducer
Adjusting
Screw

Index

Timing

Adjustment

227

-5984

(9/65)

7.15

The

alphabetical

serial

numbers

described

in

Chapter

index

from

includes
00001
7,

is

references

through

indicated

for

alternate

00050.

Each

by a reference

index

to

maintenance

item

listed

the

appropriate

procedures

which

is

section

applicable

affected

number

ALPHABETICAL

for

by

the

design

of

Chapter

machines

differences

7.

INDEX

with

227

-5984

(9/65)

1-1

AC

input

supply

power,S.

1

Access

circuit

malfunction

troubleshooting,

1.4

Access

adjustments,

4.5

Access

malfunctions,

1.4

Actuator

assembly,

4.

5, 7. 3

Actuator

assembly

removal

and

replacement,

4.5,

73.

Alternate

maintenance

features, 7. 1

Approach

to

scheduled

preventive

maintenance,

3.1

Base

plate

component

malfunctions,

1. 6

Blower

assembly,

4.4,

7. 3

Blower

assembly

removal,

7.3

Blower

assembly

removal

and

repla

cement,

4.4

Blower

motor

removal

and

replacement,

4. 5, 7. 3

Blower Scroll

removal

and

replacement,

4.5

Blower

wheel

removal

and

replacement,

4.4

Branch

office

tools,

2. 3, 7. 1

Carriage

rail,

4.

16, 7.

11

Carriage

preload

bearing

assembly,

4.

16

Carriage

preload

bearing

assembly

removal

and

replacement,

4. 16

Carriage

rail

removal

and

replacement,

4.

16, 7.

11

Carriage

subassembly,

4.

16,

7.

11

Carriage

subassembly

removal

and

replacement,

4. 16, 7.

11

Cartridge

assembly,

4.

2

Cartridge

in

place

switch

adjustment,

4.

20

Cartridge

receiver,

4.9,

7. 13

Cartridge

receiver

adjustment,

4. 19, 7.

13

Cartridge

receiver

removal

and

replacement,

4.

19, 7. 13

Cartridge

service

check,

4. 2

CE

control

panel,

2. 1

CE switches, 2. 1

Cleanliness,

3. 1

Cleaning

read/write

heads, 3. 1

Crash stops,

4.

14, 7. 9

Data

separator,

4.

24

Data

separator

adjustment,

4.

24

Detent

assembly

adjustment,

4.

10,

7.4

Detent

assembly

and

detent

rack,

4.

10,

7.4

Detent

rack

adjustment,

4.

12, 7. 6

Detent

assembly

and

rack

troubleshooting,

1.4

Detent

as

sembly

removal

and

replacement,

4.

10,

7.4

Detent

rack

removal

and

replacement,

4.10,

7.5
Diagnostic aids, 1. 1
Diagnostic

techniques,.

1. 1

Direction

switch, 2. 2

Disk

cartridge

and

read/write

damage,

3.4

Disk

cartridge

replacement

conditons,

4.4

Disk

formatting

procedure,

1. 6

Disk

height

and

run

out

check,

4.3

Drive

belt

removal

and

replacement,

4. 2

Drive

be

It

tension

adjustment,

3. 4

Drive

coil

removal

and

replacement,

4.

10

Drive

magnet,

7. 3

Drive

magnet

and

coil,

4.

9

Drive

magnet

removal

and

replacement,

4.9,

7. 3

1-2

Drive

motor

and

drive

belt,

4.

2

Drive

motor

removal

and

replacement,

4.

2

Electronic

circuits,

3. 1

Errors

and

data

retrieval,

1. 7

Error

retry

procedure,

1. 7

Front crash stop

adjustment,

4.

14

Functional

check,

1. 1

General,

6.1

Handle

and

interlock

adjustment,

4.

20, 7. 15

Head

and

disk

cartridge

scratch

description,

3.4

Head-arm

assembly,

4.17,

7.12

Head

arm

assembly

adjustment,

4.17,

7.12

Head

arm

assembly

removal

and

replacement,

4.17

Head

load

assembly,

4.

12, 7. 6

Head

load

assembly

adjustment,

4.12

Head

load

solenoid

removal

and

replacement,

4. 12

Head

select

SWitch, 2. 1

Head

load

spring

assembly,

4.

14, 7. 9

Head

load

spring

assembly

removal

and

replacement,

4.

14

Heads

loaded

switch

removal,

replacement,

and

adjustment,

4.

14

Home

SWitch,

4.

14,

7.9

Home

switch

adjustment,

4.14,

7.9

Home

switch

removal

and

replacement,

4. 14, 7. 9

Homing

the

carriage,

1. 7

Identification

of

machines,

7. 1

Index

of

service

checks,

adjustments

and

removals,

4.

1

Input

power

lines

to

disk storage

drive,S.

1

Interlocks,

4.20,

7. 15

Leading

particulars,

2. 1
Locations, 6. 1
Lubrication

of

machine,

3. 1

Mainenance

features, 2. 1

Mechanical

units,

~.

1

Non

particle

damage,

3.4

Particle

damage

to

disk,

3.4

Particle

damage

to

head,

3. 4

Plenum

cover

and

filter,

7.1

Plenum

air

filter

removal

and

replacement,

7.1

Plenum

cover

removal

and

replacement,

7.1

Power

line

interference,S.

1

Power

off

sequence,S.

1

Power

on

sequence,S.

1

Power

requirements,S.

1

Power

sequencing,

5.1

Purpose

of

supplement,

7. 1

Power

supply,S.

1

INDEX

Read

malfunctions,

Read

circuit
Read/write
Read/write
Read/write
Read/write

Scheduled
Scheduled
Sector

transducer,

Sector

transducer

Sector

transducer

Service

aids,

Service

checks,
Standard
Step

control

Special

tools,

troubleshooting,
heads,
head

replacement,

head

service

head

to

maintenance
preventive

index
removal

1.

6

adjustment,

tools,

2. 3

switch,

2.

3,

1.

1

4.

17

check,

base

plate

procedures,

maintenance

4.

22

timing

and

2.2

7.

1

1.

1

4.

17

4.

17

resistance

3.1

procedures,

adjustment,

replacement,

and

removal

check,

4.

22

4.

24

procedures,

3.

4.

Spindle

assembly

Supplement

Tachometer
Tachometer

17

Tachometer
Tachometer
Tachometer

1

Tools

and

Track

addressing, 1. 6

Troubleshooting

Visual

Write
Write

inspection,

circuit
malfunctions,

4.

1

removal

for

alternate

and

tachometer
assembly
extension
extension
extension

test

equipment,

base

3. 1,

troubleshooting,

and

maintenance

removal

rod

adjustment,

rod

removal

rod

removal,

plate

components,

4.3

1. 2

replacement,

extension

and

replacement,

and

2. 3

1. 2

4. 2

instructions,

rod,

4.

4.

15, 7. 10

replacement,

7. 10

1. 6

7.6

14, 7. 10

4.

15, 7. 11

4.

14

227

-5984

(9/65)

1-3

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International Business Machines Corporation
Field Engineering Division

112

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N.

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