Siemens Microfloppy FDD100-5 Operating And Maintenance Manual

SIEMENS

Floppy

•

Disk

Drive FDD100-5

MODEL

IVIICROFLOPPy[TM]

FLEXIBLE

FDD100-5

OPERATION

MAINTENANCE

A22742-A

DISK

1005-X001-

DRIVE

AND

IVIANUAL

*

-7630

MODEL

FDD1 00-5

Revision

Letter

A

FLEXIBLE

OPERATION AI\ID MAII\ITENANCE

A22742-A1005-X001-*-7630

Original Publication

REVISION

Description

DISK

LEVEL

DRIVE

Date

3/79

iii

Model FDD100-5 Flexible Disk Drive

TABLE

OF

CONTENTS

Section

2

Paragraph

Page

GEI'JERAL DESCRIPTION

1.1

1.2 INTRODUCTION

1.2.1

1.2.2 Daisy Chain Capability

1.2.3 Applications

1.2.4

1.3 FEATURES

1.4 SPECIFICATIONS

INSTALLATION

2.1

2.2

2.3 INTERFACE

SCOPE

Double Density

Head

Characteristics

AND INTERFACE
UNPACKING AND INSPECTION
INSTALLATION

,

1-1
1-1
1-2
1-2
1-2
1-3
1-3
1-4

2-1
2-1
2-1

2.3.1 System Configuration 2-4

2.3.2 Electrical Connectors

2.3.3 Transmitter Characteristics

2.3.4 Receiver Characteristics

2.3.5 Terminator

2.4 INTERFACE SIGNALS

2.4.1

2.4.2 Output

Input Control

Lines

Lines

2.4.3 Data Lines

2.5 PROGRAM SHUNT MODULE

2.5.1

2.5.2

2.5.3 Single-Drive

HS-Head
HM-Head

Select Option 2-14

Motor Option 2-14

Conflguration 2-14

'"

2-5
2-6
2-6
2-7
2-7

2-7
2-10
2-11
2-12

2.5.4 Multiple-Drive Configuration 2-14

2.6 OPTIONS 2-14

3 OPERATION PROCEDURES

3.1

GENERAL

3.2 DISKETTE _

3.3 DISKETTE HANDLING

3.4 LOADING THE DISKETTE 3-2

3.5 WRITE PROTECT FEATURE 3-2

4 THEORY

4.1

OF

OPERATION

FUNCTIONAL DESCRiPTION

4.1.1 Drive Select

4.1.2 Power-Up Mode

4.1.3

Head

Load

Signal Line (Option)

3-1

3-1

3-1

4-1
4-1
4-1
4-1

v

TABLE

OF CONTENTS (continued)

Section

4 4.1.4

5

Paragraph

Seek

4.1.5

4.1.6

4.1.7

4.1.8

4.1.9

4.1.10

4.1.11

4.2

4.3

4.3.1

4.3.2

MAINTENANCE

5.1

5.1.1

5.1.2

5.1.3

5.2

5.3

5.3.1

5.3.2

5.3.3

5.4

5.4.1

5.4.2

5.5

5.6

5.6.1

5.6.2

5.6.3

5.6.4

5.6.5

5.6.6

5.6.7

5.6.8

5.6.9

5.6.10

5.6.11

5.6.12

5.6.13

5.6.14

5.7

5.8

Readl'Nrite
Sensors
Write Mode 4-4

Erase

Read
Power-Down Mode 4-4
Spindle Drive
POSITIONING CHARACTERISTICS , 4-5
DATA

Hard Sector Format 4-5
Soft

Sector Format 4-6

RELIABILITy
Mean Time Between Failures
Mean
Service
DIAGNOSTIC
ERROR RATES
Write

Read
Seek
ERROR DETECTION
Write Errors

Read
ALIGNMENT
REMOVAL
Front
Drive
Stepper
Head
Readl'Nrite Head-Load
Spindle Hub and Pulley Assemblies 5-6
Carrier Frame Assembly
Write Protect

Index Sensor Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Index LED 5-8
Track00Switch 5-9
Servo Control
Solenoid Assembly 5-10
Clutch Assembly 5-10

HEAD
ADJUSTMENT

Page

Mode 4-3

Head

and

Switches 4-3

Mode 4-4

Mode 4-4

Motor

FORMAT

, 4-5

4-3

4-4

5-1

(MTBFl.

Time

To

Repair (MTTR)

Life

TECHN IQUES

'"

.,

Error

Rate 5-2

Error

Rate 5-2

Error

Rate

AND

CORRECTION 5-2

5-1
5-1
5-1
5-1

"

..

5-2

5-2

5-3

Errors

DISKETTE

AND

REINSTALLATION

Bezel

Motor

and Carriage Assembly 5-6

Assembly 5-5

Motor

and

Lead

Screw 5-5

Pad

PROCEDURES

5-3
5-3
5-4
5-4

5-6

5-7

Sensors

PWB

AMPLITUDE

and Diskette Guide Assemblies

5-7

..

5-8

5-9

CHECK

PROCEDURES 5-12

5-11

vi

TABLE

OF

CONTENTS (continued)

Section

5 5.8.1 Motor

Paragraph

Speed

5.8.2

Motor

Speed

5.8.3 ReadIWrite

5.8.4 Track

~0

Adjustment Without Frequency Counter 5-13
Adjustment With Frequency Counter 5-13

Head-

Load

Pad

Adjustment 5-13

Switch Adjustment 5-14

5.8.5 Track 00/39 Stop Adjustment 5-15

5.8.6 Index/Sector Timing Adjustment 5-16

5.8.7 Radial Alignment

of

Head

5.8.8 Head-Load Bail Adjustment 5-17

5.8.9

Head-

Load

Solenoid Adjustment 5-19

Appendix A SPARE PARTS LIST

Appendix B ASSEMBLY DRAWINGS AI\ID

MATERIAL

LISTS

Appendix C LOGIC SCHEMATICS ,

Appendix D ILLUSTRATED PARTS BREAKDOWN

Page

5-17

A-1

B-1

C-1

D-'

vii

LIST

OF

FIGURES

Figure

2-1
2-2 Outline

Title

Model FDD100-5 Disk Drive, Isometric View , 2-2

and

Mounting Dimensions 2-3

2-3 Model FDD100-5 Disk Drive System Configuration

.,

Page

2-4
2-4 J1 Connector Dimensions 2-5
2-5
2-6
2-7 Interface Signals
2-8
2-9
2-10
2-11
2-12 Program Shunt Module "

3-1

4-1
4-2 Hard·Sectored Format

J2

Connector Outline

2-6

Termination Configuration 2-7

and

Input Power 2-8

Interface Timing Diagram 2·9

Index/Sector Timing 2·11

WriteTiming

Read

Timing 2-13

.,

2-12

2-13

Write Protect Feature 3-2

Model FDD100-5 Disk Drive, Block Diagram , 4-2

for

Single Density 4-6

4-3 Soft·Sectored Format 4-7

5-1
5-2
5-3
5-4
5-5
5-6

Test Point Locations 5-12
Track

00/39

Stop

and

Head·

Load

Pad

Adjustment. . . . . . . . . . . . . . . . . . . . ...5-14

Track 00 Switch Adjustment , 5-15

Index/Sector Timing Adjustment 5-16
Head-Load Bail Adjustment 5-18
Head-

Load Solenoid Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

..

5-19

Table

1-1
1-2

2·1
2-2

LIST

OF

TABLES

Title

Model FDD100-5 Disk Drive Specification
Unformatted Data Capacity Specifications

Recommended Connectors -

P1

Page

1-4
1-5

2-5

Options 2-15

viii

SECTION 1

GENERAL

1.1

This manual describes interfacing, operation, and maintenance

Disk Drive, and

In this manual,

the Model FDC100-5 Controller, andofTTL

SCOPE

is

divided

Section 1

•

Section 2

•

Section 3 Operation Procedures

•

Section 4

•

Section 5 Maintenance

•

itisassumed

into

the

following

General Description
Installation and Interfacing

TheoryofOperation

the user

has

DESCRIPTION

five sections:

a practical understandingoffloppy

and

MOS

LSI

logic.

NOTE

of

the Model FDD100-5 Flexible

disk controllers;

e.g.,

The Company also offers a line
microfloppy
single-density, single-head controller
with

the Model FDD100-5 Disk Drive,orits
equivalent. Model FDC200-5
density, dual-head
Model FDD200-5 Disk Drive

1.2

The Model FDD100-5 Disk Driveisa high-speed, random
retrieves data
diameter.
The Model FDD100-5 Disk Drive contains electronics
functions, and
nector

INTRODUCTION

fromanoxide-coated, single-sided mylar diskette

It

provides a highly reliable and compact solutiontoproblemsoflow-cost data storage.

for

Status indications. The signal interfaceisa printed wiring board (PWB)

with

a pin arrangement

thatiscompatible

controllers. Model FDC100-5isa

controller

with

of

is

a double­for
or

for

the standard ANSI

intelligent

for

use

use

with

the

its equivalent.

access

Read,

device which stores data on and

thatis5.125 inches (13.0175 em) in

Write, Control, Step, and Direction

X3T9.2

configuration; the

edge

con-

,.,

PWB

also

has

a standard

DC

power connector. The Model FDD100-5 Disk Drive

hasanunformatted

data storage capacity

other

disk drives
tracks provideanunformatted
functionofthe host system.

1.2.1

By using MFM,
ity

on the _single-sided diskette can
tracks). An optional system
sidesofa dual-sided diskette. This
tended

1.2.2

Uptofour

capacity features

DOUBLE

M2FMorGC

track

capability, makesitpossibletostore upto500K

DAISY

Model FDD100-5 Disk Drives can

of

125K

that

have

DENSITY

CHAIN

of

the disk drives

less

data storage capacityof1

R double-density encoding techniques,

that

CAPABILITY

bytes on

capacity,

be

uses

dual index and

option,

are

employed, a total unformatted system capacityoftwo

40

tracks per diskette side.

only

the

first35tracks

09.4K

increased

coupled

to

250K bytes (40 tracks)or218.8K

file

protect

with

double-density encoding techniques and ex-

be

daisy chained on a single bus. When all expanded

To

obtain

are

normally used. The

bytes. Formatting the disk driveisa

unformatted

sensors permits data storage on

bytesofdata on a single diskette.

compatibility

first

data storage capac-

bytes (35

both

mega-

with

35

bytesisattainable.

1.2.3

Options

The Model

APPLICATIONS

that

can be selected and installed

FDD100-5

A.
B.
C.

D.
E.
F.

G. Smart terminals.

by

the

customer are availabletobroaden applications.

Disk Drive

Microcomputer
Power

Microprocessor systems.

Word processing systems.

Desk-top calculators and portable computers.

Text

typing

editing systems.

canbeused

program/load storage.

systems.

in the

following

applications:

1-2

The Model FDD100-5 Disk Driveisalso

equipped

withaninterface that allows upward expansion

of

the units

power requirements
motor.

1.2.4 HEAD CHARACTERISTICS

The read/write
change

(0.03302 cm) wide,
carriageispositioned by a precision four-start
magnet stepper motor.

1.3 FEATURES

The Model FDD100-5 Disk Drive includes the following features:

within

headisof

capability

A. Small

the system

have

by

enhancing off-track reading capability. The written trackis0.013 inch

and

Size

and

future system enhancements with the larger floppy disk drives. AC

been

eliminated through the

the single-gap type

the 40 tracks

- compactness

are

with

centered

lead

and

light weight.

useofa

trailing tunnel-erase structuretoensure inter-

at

1/48-inch (0.053-cm) intervals. The

screw thatisdriven by a low-power, permanent-

DC

servo-controlled spindle-driven

head

B.

High Data Integrity - soft error rate

C.

Low Cost - competitive

D.

Compatible Media - industry-standard media

interchangeability.

E.

Gentle Media Handling - field proven patented positive operator
interlock extends media life,
diskette

F.

Ceramic/Ferrite

G.

Daisy-Chain Capability - uptofour

on

H.

Simplified Power Requirements -

I.

Molded Construction -

unless

a single

packageiscorrectly positioned in disk drive.

Heads

bus.

with

cassette

and

- high reliability

for

rugged

J. Write Protection - optical write

K.

High-Speed

of

25 milliseconds.

L.

Industry Standard Tracks - allows

industry standards

Head

Positioner - provides track-to-track

for

the first 35 tracks.

not

greater than one in 109bits.

drives.

and

format

does

not

allow clutchtoengage

and

long life.

disk drives maybeinterconnected

uses

only+5and

consistency

inhibit

protects data file.

useofupto40 tracks

and

+12 volts

quality.

ensures

access

and

DC

power.

time

matches

M.

Double-Density Recording - disk drive electronics

for

use

with

MFM, M2FM or

which enable up

sideofa diskette.

to

250 K bytesofunformatted datatobe

GCR

double-density encoding techniques

1-3

and

head

are

storedoneach

designed

1.4 SPECI F

ICATIONS

Specifications
specifications are listed in Table 1-2.

Track Density:

Rotational
Data Transfer Rate:

Access Ti

Track-to-Track:
Average Random

Settle Time:

Average Latency:
Recording Density
Data Flux Density:
Head
Power-Up Delay:

Load

for

Parameter

Speed:

me

-

Time:

the Model

FDDl

00-5 Disk Drive are listed in Table 1-1.

Table 1-1. Model FDD100-5 Disk Drive Specifications

Access

(FM):

Time:

GENERAL

35 Tracks

48 TPI

±.

msec

msec

msec

sec

3 rpm

msec

msec

BPI

(inner track)

300

125K bits/sec

25
298

15

100
2581
5162 fci (inner track)

50

1

Unformatted

Characteristics

48 TPI
300

125K bits/sec

25

msec

340

15

msec

100

2768

5536 fci (inner track)

msec

50

1

sec

40 Tracks

±.

3 rpm

msec

msec

BPI

data capacity

(inner track)

Parameter

Height:

Width:

Length:
Net Weight:

Shipping Weight:

Media Requirements

Type

820

(or equivalent):

Type

821 (or equivalent):

Type

822 (or equivalent):

Power:

Typical Power Dissipation:

-

PHYSICAL

Ch

aracteristi

3.25±.0.02 inches (in.) (8.255±.0.0508 cm)

3.38

±.

0.02 in. (8.582±.0.0508 em) over

5.75

±.

0.02 in. (14.605±.0.0508 cm)

8.00 in. (20.32 cm) max.

3.5 pounds (1.5876 kg)

4.5 pounds (2.0412

Soft-Sector Format

10 Physical Sectors
16 Physical Sectors

+12VDC

100

+5VDC±.5%,0.7

50mV
12W

7W

±.

mV

POp

pop

operating

standby

5%,

max. ripple

max. ripple

kg)

1.8A max.,

A max., O.4A

cs

0.80A

typ.,

typ.,

front

bezel

1-4

Table 1-1. Model FDD100-5 Disk Drive Specifications (continued)

ENVI RONIVIENTAL

Temperature

Operating:
Shipping
Wet Bulb

Relative

Humidity
Operating:
Shipping

Mean

Time

Mean

Time

Media

Life

Design Life:

Parameter
Range

or

-

Storage:

(maximum):

or

Storage:

Range

-

Parameter

Between Failure (MTBF):

To

Repair

(with

(MTTR):

approved media):

Table 1-2. Unformatted Data Capacity Specifications

4

to

460C (40to1150F)

to

-40

600C (-40to1400F)

36.30C (780F)

to

80%, noncondensing

20

to

95%, noncondensing

5

RE

L1AB IL1TY

8500

hours

spindle-drive

0.5-hour

Not

less

5 years

Characteristics

Characteristics

(assume

25% power-on cycle

motor)

than 3 x 106passes

for

per track

Capacity

Track:
Diskette (35 Tracks):

(40 Tracks):

Single Density (FM) Double Density (IVlFM, M2FM)

Single Side Double Side Single Side

3.13K

109.4K bytes 218.8K bytes 218.8K bytes

bytes

3.13K

bytes

125.0K bytes 250.0K bytes

6.26K

250.0K

bytes

bytes

6.26K

437.6K

500.0K

Double Side

bytes

bytes
bytes

1-5

SECTION 2

2.1

During unpacking

2.2

UI\IPACKING

A. Remove contentsofshipping container

B.

C.

D.

II\lSTALLATION

INSTALLATION

AND

INSPECTION

and

inspection,

damage.Ifdamageisevident,
Specify nature
Verify
list.
Verify
on shipping invoice.

Inspect assemblies

necessary, tighten hardware.

that contentsofshipping container

Notify

that model designation

use

the following procedure:

and

extentofdamage.

a Company representativeifanythingismissing.

for

loose hardware

AND

notify

carrier

and

serial number

INTERFACE

and

inspect

and

manufacturer.

agree

with

agree

and

connectors;

for

in-transit

shipping

with

if

those

The Model FDD100-5 Disk Drive maybemounted in oneofthe

A. Horizontally,

B.

Vertically, on either the rightorleft side,
openingtoone side or the other side.

C.

Vertically,

D.

Any

combinationofA,B,and/or

Figure 2-2 shows

2.3

Communication between the Model FDD100-5 Disk Drive and the
an

I/O

cable. Powertothe Model FDD100-5 Disk Driveisapplied through a separate cable.
interfacesignal lines
ideal signal transmission, the

132 Ohms. Maximum cable length between the

greater than 10 feet (3.048 m).

outline

INTERFACE

are

terminatedbya resistor

and

with

PWB

facing upasshown in Figure 2-1.

with

the

door

opening upward.

mounting dimensions.

network

input/output

(I/O)

C.

that offersanimpedanceof132 Ohms. For

cable should

controller

following

with

the

have

and the last disk drive should

positions:

door

controllerisestablished through

Input

a characteristic impedance

be

of

not

2-1

L.U:::l...J

000

iii::::!

X

Q

':.

(9

Z

f-

ZL.U

I

- -

allllllll@)

:?;

QJ

:>

U

.;:

+-'

QJ

E

o

Vl

QJ

>

";:

o

~

.!!!

o

LO

6

o

.-

o
o

u.

(jj

-g

~

.-

N

QJ

...

::l

Cl

U.

2-2

SERVO
CONTROL

PWB~

I

I .

IN.

1.87

14.74 CM)

I'"

·14--

3125

6.94

IN

crvl)

-----'1

-----=t~o~

.--

__

I i

L......:..,I...J

LP;

LP

.125

IN.

(.318 CM)

~

5.500
(13.97 CM)

IN.

IN.

5.87
(14.91 CM)

r-

I

I

~

w

U

el'

----+~}1

1\

DOOR 6-32 x .31 IN.

OPEN

POSITION~r==h

DOOR T

CLOSED

POS~.:~OI:~

.06

1.15

---'1

(8.59 CM) I

j~

IN.

TypJ

CM)

.28

IN.

(.71

CM)----'

14-1.0

I...·

I...

IN.

MAX

(2.54

C~)

I

-P;----

I I I •

187

IN. 1 _ 3.125 IN.

~

r--

14.74 CM)

(.7874 CM)

(4)

MTG.

(7.94 CM)

8.0

IN.

(20.32

HOLES

-----.

MAX.

CM)

I

r~o;

6-32 x .31 IN. (,7874 CM)

1

DEEP

MTG.

(2) PLCS. EACH SIDE

Figure 2-2. Outline

HOLES

~I

1

•

l_

.06

IN.

TYP

(.15 CM)

.860 IN.

(2.18CM)

and

Mounting Dimensions

-0+.-

I

SIGNAL
INTERFACE
CONNECTOR

7.11+.10IN.

(18.06.:!:.

.25

CM)

NOTE:
UNLESS OTHERWISE

DIMENSIONS

.34

+ .10 IN.

(8.64.:!:.

.25 CM)

STATED,

AREININCHES.

TOLERANCES:
.XXX

.XX

+

~

0.010

0.020

2.3.1 SYSTEM

CONFIGURATION

The Model FDD100-5 Disk Drive
shown in Figure 2-3.

I/O

CONTROLLER

0

FDD

canbeconnected in either a star or daisy-chain configuration

CD

FDD

0

FDD FDD

CD

as

CONTROLLER

Figure 2-3. Model FDD100-5 Disk Drive System Configurations.

I/O

II

FDD FDD FDD

I I I I I

DAISY

STAR

CHAIN

...

FDD··

[2]

NOTE ­TERMINATE

IN
REMOVE
FROMA

ON

•

DAISY

DAIS

[!]

LL

Y CHAIN.

CHAIN.

TERMINATION

=

TERMINATION

LAST DISK

OTHER DISK DRIVES

NETWORK.

DRIVE

NETWORKS

2-4

In the star configuration,

each

disk drive requires a termination

network;inthe daisy-chain config­uration,
configuration can interface

2.3.2

The interface between the Model FDD100-5 Disk Drive and the

tors:
ground

2.3.2.1 Signal Interface Connector. The signal interface

with
the
corner

mended connectors

only

the last disk drive in the daisy chain requires a termination network. Either system

withupto

ELECTRICAL

J1

and J2.J1provides the signal interface and J2 provides

"Fast-On"

dimensionsasshowninFigure 2-4. Even-numbered pins

PWB,

and odd-numbered pins

of

the

TypeofCable Manufacturer

PWB.

terminal.

A slotisprovided between pins 4 and 6

forP1are

CONNECTORS

listed in Table 2-1.

Table 2-1. Recommended Connectors -

four

Model FDD100-5 Disk Drives.

are

located on the solder side. Pin 2 is located closesttothe

(J1)is

are

Connector PIN

controller

DC

located on

for

connector keying. The recom-

P1

consistsoftwo

power. Thereisalso a frame

a 34-pin

PWB

edge

the

component side

Contact PIN

connector

connec-

of

Twisted Pair, 26 AMP 583717-5

"Scotchflex"

Flat

.450+

11.143

Cable

1 1

.005 IN.

:!:

.0127 CM)

KEY

SLOT---./

2

3M

/..-

'1c:g:,ti~01'~'6

II

.400 + .005 IN.

11.of6+ .0127 CM)

CM)

~

.400.:!: .005 IN.

11.016.:!: .0127

CM)

~

t

I'

--..

.050 IN.

1.127CM)
NOM.

1

..

..

050 IN

~i.127

NOM.

'.785

14.5339 + .0127 CM)

CM)

~

+.005

1.-.1.254

IN.

1-583616-1

3463-0001 N.A.

34

t

~

.100 IN•

CM)

NOM.

•

.093

1....-1.236CM)

NOM.

BOARDTHIC

.062 + .007 IN•

1.15748 + .017

•

350+

1.889-+

IN.

1

.01

.2

- .

o IN•

54CM)

KNESS

78CM)

Figure 2-4. J1 Connector Dimensions

2-5

2.3.2.2 Power Connector. The

DC

power connector (J2)ismounted oppositetoJ1 on the
component side
mended mating connector
recommended wire
+5V

and +12V power returns

of

the

PWB.

Power connector J2isa 4-pin AMP PIN 1-480426-0. The recom-

for

P2isAMP PIN 1-480424-0

that

sizeisNo. 18 AWG. Figure 2-5 shows the pin-numbering sequenceofJ2. The

are

tied together

J2 CONN ECTOR

and

connected

Figure 2-5. J2 Connector Outline

2.3.2.3 Frame Ground. The Model FDD100-5 Disk Drive must
ensure proper operation and

to

nected

the disk drive frame. A Fast-On tabisprovidedonthe disk drive. This tabisan

low

noise susceptability. The AC ground or neutral wire shouldbecon-

uses

AMP pinsPIN 60619-1. The

to

the

chassis

be

groundedtothe controller

at the disk drive.

to

E.T.C. PIN
3431, and the mating connector
and

logic ground

are

provided on the main disk drive

is

AMP PIN 60972-1.

noise susceptability in the disk drive. Modification
drive

PWB.

2.3.3

The Model FDD100-5 Disk Drive
signals. This
ated

by

TRANSMITTE

IC

can

sink 48 milliamperes at a

a 132-0hm resistor

R CHARACTERISTICS

usesanSN7438ICor

low

network

at the controller interface.

2.3.4 RECEIVER CHARACTERISTICS

The Model FDD100-5 Disk Drive
from

the controller. The

inputofeach

usesanSN7414ICor

receiveristerminated by a resistor network.

PWB;

is

made

Means

for

AC coupling only between frame

however,

useofthis feature may increase

by removing R53 (1M)

from

equivalenttotransmit all control and data

levelofO.4-volt.

Output

signals

aretobe

equivalenttoreceive all transmitted signals

main disk

termin-

2-6

2.3.5

TERMINATOR

The resistor network

socket on the
together
Drive

witha330-0hm

is

shipped

PWB.

with

thatisusedtoterminate all

Network impedanceis132 Ohms provided

resistortoDC

a terminator installed.

SIGNAL

GROUND

0------4..------a

0-----

groundasshown in Figure 2-6.

+5V

.....

input

220n

330n

signalsisinserted inorremoved

bya220-0hm

Each

Model F

from

resistorto+5V

DD1

00-5 Disk

a

Figure 2-6. Termination Configuration

2.4

A diagramofthe Model FDD100-5 Disk Drive interface signalsisshowninFigure 2-7,

face signal timing requirements

2.4.1 INPUT

I

nput

control

2.4.1.1 Drive Select Lines. There

DS3(J1-14)
allows the controller
ication

INTERFACE

signals are carriedbyeight lines; oneofwhichisoptional.

are

standard,

with

the disk drive, the line must remain true

SIGNALS

are

shown in Figure 2-8.

CONTROL

to

communicate with the disk drive

LINES

are

four

and

DSO(J1·6)isoptional. A

Drive Select lines:

low

(true) level on

assignedtothat

because

all transmitters

DS1

(J1-10),

line. During all commun-

DS2

anyoneofthese lines

and

receivers

and

the inter-

(J1-12),

are

and

gated

2-7

OPTIONAL {

MODEL

FDD100-5

J1

10
12

14

16

18

20

22

24
26

28

30

32

34

INTERFACE

SPARE

2

4

6

8

RESERVED·

DRIVE
INDEX/SECTOR

DRIVE

DRIVE

DRIVE

MOTOR

DIRECTION SELECT

STEP

COMPOSITE WRITE

SELECT

SELECT 1

SELECT 2

SELECT 3

SIGNALS

fI

ON

CONTROLLER

DATA

--

WRITE

TRACK

WRITE PROTECT
COMPOSITE READ

RESERVED·

SPARE

GATE

00

DATA

MODEL

FDD100-5

*THESE PINS

ODD PINS RETURN (DC GROUND)

INPUT POWER

J2

+12V
12V RETURI\J

ZERO V (5V RETURN)

+5V

HAVE

BEEN RESERVED FOR

1

2

3
4

Figure 2-7. Interface Signals and

2-8

USEBYTHE

Input

Power

MODEL

CONTROLLER
POWER SUPPLY

FDD200-5

DISK

DRIVE.

POWER

MOTORON---..,

ON-.J

~

l,ooMSECMIN.

I

DRIVESElECT~~~~~l

VALID

TRK

00 I

...

_~_~_~__~_~

.

---j

r--

500

NANOSEC

MAX,

~_~,~_~_~

S\

~_~

~~~,~~TPRO~~NOSE~

MAX.

VALID

INDEX!

SECTOR

OUTPUT

r~~~g;r'ON

STEP

WRITE

GATE

II~

1 SEC

I I

~

I I m

l~SfCMI~.--j

I I

'I'SECMIN.,

I n

MAX.

f+-

.......

~~-:------------S;----~----~--

-

fi--50~

~

~

NANOSEC

~_~~-~-~~~lS~~-~---~~-~-

20 MSEC

MAX.

MAX.

I--~-~---I\~S--~---~~---

I--

lJlJ1J-:---~~~~

1:-

~~\EC

MIN.

--j

L

f,.-lj.lSECMIN.

~--..t40

MSEC

~~

---

MIN.

WRITE

VALID

READ

~

; I

SOMSEC~

1 SEC

MIN.

DATA

DATA

*IF

HEAD LOAD WITH SELECT. IF HEADISALREADY

I I

'0

MSEC

MIN.---l

~SO

Figure 2-8. Interface

1 MSEC

MSEC

MAX.

I

MAX:

Timing

2-9

---~~J

rBI'SECMAX.

lflJlflr----------

--

lflJ~~SFS-lflJ

J

r--850j.LSEC

:1

LOADED 500 NANOSECONDS.

Diagram

MIN.

with

a corresponding Drive Select line; therefore, they

can

be activated

onlybythe

corresponding

Drive Select command
gram shunt module
assignedtothe

2.4.1.2
interface) the

spindle takes one second after this line

after

occur

able, the spindle

of

this featureisrecommendedtoreduce
disk drive.Ifthe
Head Load

2.4.1.3 Direction Select
head. A
a Step pulse occurs. The Direction Select signal should
microsec. after the trailing

low

DSO(J1-6) line.

Motor

DC

motor

with

Motor

level on this line

from

the

controller.

to

allow

the

multiplexingofthe

On(J1-16). This featureisprovided
spindle

on and before any readingorwritingisattempted.Ifsuch a featureisnot

motor

Motor

motor.Alow

can

be

kept

on

On signalisused, the program shunt module may require changingifthe

On

optionisselected.

(J

1-18). This line controls the direction

causes

edgeofStep.

the

In a mUltiple-drive system, the user must alter the pro-

level at the interface turns the spindle

is

activatedtocomeupto

by

permanently grounding the

average

headtomove toward the centerofthe spindle

power consumption and increase overall lifeofthe

I/O

lines. An optional interface line may

for

be

the usertodirectly

speed. A one second delay should

Motor

of

stable

from

1.0 microsec. beforeto1.0

travel

control

motor

On line; however,

of

the read/write

(via the

on. The

only

be

desir-

use

when

2.4.1.4 Step (J1-20). A
of

track move
width

shouldbenot

pulse every

2.4.1.5 Write Gate (J1-24). A

on

the diskette. A high (false) level on this line enables the stepper

Data linesothat

2.4.2

Output
Write Protect.

2.4.2.1 Track
the read/write headisat

signals

the head. Head movement begins

less

25

milliseconds.

Read

data mayberead

OUTPUT

from

disk drivetocontroller

00'

(J1-26). A

low

pulse on this line, together

on

the trailing

than 1.0 microsecond and the maximum pulse repetition rate shouldbeone

low

level on this line enables Composite Write Datatobe

from

the diskette.

LINES

are

carried by three lines; Track 00, Index/Sector, and

low

level

on

this line informs the

track

~1jJ.

Subsequent step-out pulses

with

Direction Select, initiates a single-

edgeofthis pulse.

motor

are

ignoredbythe disk drive.

logic and Composite

controller

Minimum

that

the position

pulse

written

Read

of

2·10

2.4.2.2 Index/Sector (J1-8). For

transmits a reference Index pulse once every diskette rotation

soft

sector operation

that

uses

single-hole media, this line

to

indicate the beginningofa track.
For hard sector operation
Sector pulses, where Sector pulses indicate the beginning
Sector
of
timingisshown in Figure 2-9.

is

4 ± 1.5 milliseconds. An

the Model FDD100-5 Disk Drivetoenable either sideofthe diskettetobe

SOFT SECTOR

HARD

SECTOR (16

(INDEX

6.25

that

uses

multi-hole

optional

ONLY)

rf--------200

U

--.l

TAKEN

SECTOR

MSEC------:

AS AN

15 0

14--4

ILLUSTRATION)

INDEX

I I I I

,....

..-------200

media, this line transmits the Index pulse and all

setofphotosensors

MSEC

+ 1.5

MSEC

SECTOR

j4-12.5

MSEC----!

of

a sector.

are

MSEC------

ss

SECTOR

1

MSEC--------t

Pulse

installed on some configurations

width

for

both Index and

recorded. Index/Sector

....~..

I

U-

SECTOR INDEX

15

I

...

1

Figure 2-9. Index/Sector

2.4.2.3 Write Protect(J1-28). A photosensor assembly
notch

to
condition

2.4.3

Data lines are

2.4.3.1 Composite Write Data
to

in

the diskette.Ifa notchisnot

indicate

that

a Read-only diskette

also

inhibits

DATA

usedtowrite

writing

LINES

data onorto

be encoded on the diskette

detected, a low-level signalistransmittedtothe

has

been

inserted

data on the diskette.

read

data

(J

1-22). The

of

the selected disk drive.

from

controller

Timing

into

the diskette.

Pulse

senses

the Model FDD100-5 Disk Drive. This

uses

the presence

this linetotransmit

widthsofclock

or

absence

information

and data bits should

of

controller

a

2-11

be

a minimum

interval

write clock frequency should

is

of

250 nanoseconds

8 microseconds, while the c1ock-to-dataordata-to-clock intervalis4 microseconds. The

be

and

a maximumof2.1

held

within±.0.5 percent. Write timingisshown in Figure 2-10.

microseconds.

At

125 kHz, the clock

STEP

WRITE

WRITE

DATA

GATE

....------------------------;5

--..:....-----.....;-j

:·~~~~~C

-

--..1

~I

8,uSEC

.:t

40 NSEC

--.:..14------1-----------------~5

40MSEC~1

Figure 2-10. Write Timing

Read

2.4.3.2 Composite
the controller. Informationistransmitted in the encoding

and

between clock

data bits. Decodingofdataisaccomplishedbythe controller.

Data (J1-30). This line furnishes previously recorded information

~II

r--

scheme

used

l-S

-----5

250 NSEC

2.15,uSECMAX.

without

MIN.

S

discriminating

Data

and

to

clock

are

pulse widths
in Figure 2-11.

2.5 PROGRAM SHUNT MODULE

Figure 2-12 shows the program shunt module
an

IC socket located on the

the program shunt

is

always unused.

1 microsecond±.250 nanoseconds at the encoded frequency.

PWB

near J1. The IC socket

has

six

setsofpins.

One

Read

timingisshown

with

the program shunt installed. The module

has

seven

setsofpin receptacles, while

setofpin receptacles at either endoftheICsocket

2-12

is

STEP

LOAD

HEAD

---------,U

~~~SECI

__

VALID
READ

DATA

HS

DS1

A ­B -

LEADING

LEADING

EDGE OF

EDGE OF

------......;..----------~s

~

50

MSEC

BIT

MAY

BE~800

BIT

MAY

BE~

Flgure 2-11.

ICSOCKET

MIN_I

NSEC FROM ITS

400

NSEC FROM ITS

Read

Timing

14~SEC

..

I

A

B

NOMINAL
NOMINAL

I 8

....

I

A

POSITION
POSITION

~SEC

~I--

D

I

..

A 1.0~0.25

HS
DS1

~

~SEC

DS2
DS3
MX

(BLANK)

HM

• SINGLE

• HEAD LOAD WITH

D

A

DRIVE

HS

DS1-DRIVE

DS2-DRIVE
DS3 ­MX-MULTIPLEX

HM -

CONFIGURATION

- HEAD SELECT - HEADISLOADED BY

DRIVE

HEAD

PROGRAM SHUNT

MULTIPLE

•

DRIVE

MOTOR -

SELECT

SELECT 1 - SELECT

SELECT 2 - SELECT

SELECT 3 - SELECT

- MUSTBECUT FOR
HEADISLOADED BY MOTOR ON SIGNAL.

Figure 2-12. Program Shunt Module

• HEAD LOAD WITH MOTOR

•

DRIVE

SIGNAL

SIGNAL
SIGNAL

FOR

FOR
FOR

MULTIPLE

B

DRIVE

NUMBER 2 PROGRAMMED

DRIVE

SELECT

DRIVE

DRIVE
DRIVE

DRIVE CONFIGURATION.

CONFIGURATION

SIGNAL
ONE.
TWO.

THREE.

DS2
DS3

MX

(BLANK)

HM

ON

2-13

2.5.1

The

Head

HS

- HEAD SELECT OPTION

Select

option

causes

the

headofthe disk drivetoload when the Drive Select

signal

is
received. The program shuntisinstalled
2·12A). The

2.5.2 HM - HEAD MOTOR OPTION

The

Head
received. The program shuntisinstalled
2-128). The HM position

2.5.3

With a single-drive configuration, the program shunt
select either the
the

headifHSisprogrammed.

2.5.4

HS

position

Motor

option

SINGLE-DRIVE

HS

MULTIPLE-DRIVE

canbeused

causes

canbeused

or HM positions.

in either single-driveormultiple-drive configuration.

the

CONFIGURATION

COI\IFIGURATION

so

that

the

head

of

the disk drive

so

that

the

in either single-driveormultiple-drive configuration.

Any

Drive Select

HS

positionisshort circuited

to

load when the

HM

positionisshort circuited

need

not

be

altered in any way except

signal

will activate the Select Light

Motor

(see

On

(see

Figure

signal

Figure

and

is

to

load

With a multiple-drive configuration, the
Select) positions must
special
installation

2.6 OPTIONS

The Model F
standard methods described in subsection 2.5. The modifications
padsorcutting
34, orbealtering the program shunt module. Available options

tool,

PIN 435705,orby bending the

to

provide the

DD1

jumpers,orby using the optional interface lines at J 1connector pins2,4,6,32,

be

cut

(see

necessary

00-5 Disk Drive

can

MX

(Multiplex) position

Figure 2-128). The shunt positions

legofthe program shunt away

open-circuit condition.

be

modified by the customertooperate by other than the

and

twoofthe three

canbecut

from

the socket before

canbemade by connecting

are

listed and described in Table 2-2.

DS

by using AMP

(Drive

option

and

2-14

Table 2-2. Options

Option

¢

Drive Select

Write Protect

Interface Only

Write Inhibit
by Interface Line

Independent
Load (Pin J1-6)

MotorOnwith
Select

Indicator Lamp Cut etch between

with

Motor

(DSO)

to

Controlied

Head

On

Adds

DSO

input

accommodate
cut etch between
padsEand

This

option

or Non-Write Protected diskette

it

does

not

Cut etch between
C

to

pad

Add

jumper between pads E

module

Cut etch between

padsGand

pads

Hand

four

G.

indicatestothe interface

inhibit

associated

to

select neither

P.

P.

Modification

linetospare

disk drives.IfJ1-6isdesignatedasDSO,

padsEand

writing. Cut etch between

padsCandD,then

with

padsMand

padsGand

interface linesothat

F, then

spare

andR.Modify

HM

nor

N; then

H; then

add

that

is

installed in the disk drive;

add

interface line.

HS.

add

add

system

jumper between

a Write Protected

padsCand

jumper from

program shunt

jumper between

jumper between

can

D.

pad

Indicator Lamp Cut etch between
with

Interface Only

Select Disk Drive
without

Note
Upon implementing any optional modification, verify

properly terminated.

Loading

Head

to

pad associated

Place

program shunt module in HM position. (Load

only

with

Motor

padsGandH;then

with

On

selected

signal.)

that

spare

interface line.

associated interface line

add

jumper from

is

head

pad

H

2-15

SECTION 3

OPERATION PROCEDURES

3.1

There

interface. Operating procedures consist primarily
and corrective maintenance procedures

and
tracks

3.3

arenofront

lamp lights when the disk drive

3.2

The diskette recording medium
(13.335 cm) square. The diskette recording medium

is

Protection

made

that

GENERAL

panel controlsonthe Model FDD100-5 Disk Drive. A single

DISKETTE

of

mylar coated

are

spaced

DISKETTE

of

the diskette requires the

0.02083-inch (0.529082 mm) apart.

HANDLING

is

selected. All power

are

covered in Section5,Maintenance.

is

contained in a

with

magnetic oxide

same

of

loading and unloading the diskette. Adjustments

careful handling specified

front

panel indicator

and

control functions

sealed

on

envelope

is

5.125 inches (13.0175 cm) in diameter

both

sides.

are

handled through the

that

measures

The diskette

for

computer magnetic

5.25 inches

has

40 circular

tapes.

Use

the following procedure:

A. Return the diskette

from the disk drive.

B.

Keep diskettes away

C.

Replace storage envelopes when they become worn, cracked,

distorted.

D.

Do

not

pen;

use

E.

Do

not

cause

lossofdata.

F.

Do

not

in

excessof51.60C (1250F)

the

diskette.

to

its storage envelope wheneveritis

from

magnetic fields and ferromagnetic materials.

write on the plastic jacket

a felt-tip pen.

touchortrytoclean the diskette surface. Abrasions may

expose diskettetoheatorsunlight. Exposuretotemperatures

may

withalead

cause

irreversible

pencilorball-point

removed

damage

or

to

3-1

3.4

LOADING

THE

DISKETTE

To load the diskette, open the
the diskette, and close the door. A door interlock mechanism prevents the
diskette

3.5 WRITE PROTECT

The disketteisprotected
an
sensor detects the presence
is
and a status signal informs the controller

tion
controller interface which

is

not

properly loaded. The door maybeclosed

unprotected (Read

sensed,

writingisallowed. When the notchisnot

to

the disk drive electronics may

and

door

on the

FEATURE

from

being

written

Write),

or

will

and

absenceofa notch in the sideofthe diskette. When the open notch

not

inhibit

front

panelofthe Model FDD100-5 Disk Drive, insert

without

on when a Write Protect tabisused.

a Write-protected (Read-only) diskette. A photoelectric

sensed

that

a Write Protect condition exists. Optional modifica-

cause

the Write Protect signaltogo

writing

on the diskette.

a diskette being loaded.

(covered

with

atab),

door

from

closingifthe

Figure

writingisinhibited,

onlytothe disk

3-1

shows

drivel

__

UNPROTECTED

WRITE

PROTECT

TCH

ll

Figure 3-1. Write Protect Feature

'-----------le

WRITE

WRITE
PROTECT

I TAB

/

©o

o

PROTECTED

3-2

SECTION 4

THEORY OF OPERATION

4.1

Figure
Drive. The disk drive

servo

control

4.1.1

Disk drive selection occurs when the Drive Select line that corresponds

is

active. Only the disk drive in which this lineisactive will respondtoinput

operation, the Drive Select line

activate the

4.1.2

two

The

has

been

FUNCTIONAL

4-1isa functional block diagram that

has

PWB

which contains the speed-control circuit

DRIVE

output

POWE

DC

power sources

applied, a 1-second delay must

SELECT

lines. Optional modesofoperation

R-UP

DESCRIPTION

one

main

PWB

which contains

will

load the read/write (R/W)

MODE

canbeappliedtothe disk driveinany sequence; however, once power

be

shows

overall operationofthe Model FDD1 00-5 Disk

Read,

for

the spindle drive motor.

are

availabletothe

allowed before any

Write,

head,

and

enable the

Read

Control logic, and a small

to

a particular disk drive

lines. Under normal

input

lines,

and

user.

or Write operationisat­tempted. This delay
time the

automatically

Therefore, the disk drive

activation
indeterminate immediately after application

R/W
be

performed

4.1.3 HEAD LOAD

The

allows the diskette envelope
contact
useofthis option, the

heads

Head

is

Motor

resets

of

Motor

before any

until

Load

made

is

for

stabilizationofthe diskette rotational

On

lineisactivated.

the electronics

is

ready

On; also, the initial position

ReadorWrite operation, a Step

the Track00status signal becomes active.

SIGNAL

signalisapplied through control logic to the

with

through the slot in the envelope. The

headisloaded when either the Drive SelectorMotorOnsignals

When

and

inhibits inadvertent writingorerasing

for

operation after applicationofDC

LINE (OPTION)

its rotating media

DC

powerisapplied, a Power

of

of

the R/W

DC

power. To ensure proper positioning

to

Head

Out

be

Load

head

operation

Head

pushed

signal

speed

and

mustbeallowed any-

On

Reset

(POR) pulse

on the diskette.

power

with

Load solenoid. The solenoid

against the R/W

lineisoptional. Without the

and

one second after

respecttodata tracks

for

each

disk drive should

headsothat

are

of

the

activated.

is

4-1

TRACK
SWITCH

00

COMPOSITE
READ

DATA

WRITE

GATE

COMPOSITE
WRITE

DATA

WRITE
PROTECTED

+5V.12V

IN

DEX[SECTOR

DRIVE

SELECT

0*.1,2,3

HEAD

LOAD

TRACK

.00

READ
LOGIC

WRITE
LOGIC

READ

WRITE

ERASE

WRITE

PROTECT

DATA

DATA

I

HEAD

LOAD

I

SOLENOID

l

~_I----.

I
I

I
I
I

I
I

I

I

,,---I

L_

WRITE

PROTECT

SENSOR

*

CONTROL

LOGIC

INDEX/SECTOR

TACHOMETER

----I-

I

I

tit

\:K::,J

ENVELOPE

I

MOTOR

STEP

DIRECTION
SELECT

ON

SERVO
CONTROL
LOGIC

CONTROL

LOGIC

PRINTED
BOARD

WIRING

DRIVE

MOTOR

HEAD

LOAD

TRACK

STEPPER PHASE

.0.0

(12V)

¢1.

¢2,

¢3.

¢4

ACTIVITY
LIGHT

Figure 4-1. Model FDD100-5 Disk Drive, Block Diagram

4-2

*OPTIONAL

FEATURE

4.1.4 SEEK MODE

head

The read/write

carriageismounted on a threaded shaft connectedtothe stepper motor.Asthe

stepper
When
This allows
determines the direction

mines the amount

sequential pattern

RIW
track

reached. Seeking cannot occur while a Write operationisin

4.1.5 READ/WRITE HEAD

The Model FDD100-5 Disk Drive
on

basically aferrite core thatismounted in a ceramic button assembly, the faceofwhich
profile. The

motor

the

headtomove one track inorout, depending on the stateofthe Direction Select line. Multiple-

accessingisaccomplished

the

head

turns in one direction, the

motor

turns in the other direction, the

accesstoany track on the diskette. Direction Select from the interfaceorcontroller

of

rotationofthe stepper motor, while the numberofStep pulses deter-

of

stepper-motor rotation. The control logic translates these

of

phase

carriage. The

head

also

uses

currents to the stepper motor.

by

repeated pulsingofthe Step line until the desired track

uses

headisfixed with respecttothe carriage

a trailing tunnel-erase structure.

headisstepped outward toward the

headisstepped inward toward the spindle hub.

Each

pulse

progress.

a unique single-sided read/write

edgeofthe diskette.

input

on

the Step line

head

assembly

and

diskette surface. The

thatismounted

has

pulses

into a

causes

has

head

a spherical

the

been

is

4.1.6 SENSORS AND SWITCHES

The index
passesitin rotation. The sensor
Sector signal. The Track
reaches
Write Protect sensor detects the
covering the notch (to indicate a Read-only diskette), a Write Protect
interface. The Write Protect
possible.

sensorisa light-sensitive device whichisactivated whenever

outputisa pulse whichisfed backtothe interfaceasthe

0llJ

track

signalisgenerated when the

00

on the diskette. The Track

presenceorabsenceofa notch in the diskette envelope.Ifa tab

signal

also disables the Write logicsothat writingonthe disketteisnot

llJllJ

signalisthen transmitted back to the interface. The

RIW

head

carriage trips a microswitchasit

an

index

signalissent backtothe

or

sector hole

Index/

is

4-3

4.1.7 WRITE MODE

A Write operation records data on the diskette in the form

of

flux

reversals.

To

write data on the
diskette, certain
erasure
Figure 2-8). The Write

4.1.8 ERASE MODE

The
are applied
sideofa track. This ensures
case

4.1.9 READ MODE

A
plished

entered on a selected disk drive by deactivating the Write Gate line. Certain

of

data duetohardware failure, unstabilized

Erase

circuitryisalso enabledbyactivating the Write Gate interface line

conditions.

Read

operation retrieves previously recorded data from the selected diskette. Thisisaccom-

by

timing

to

the R/W

the winding in the

relationships must

circuitryisenabledbyactivating the Write Gate interface line.

head

erase

coils when

off-track

read

reading

head

be

writing

ability

sensing

ensured.

head

data. The

and

flux

These

position, or

reversals on the diskette. The

relationships

head

in transit conditions

erase

poles

eraseanarea

provides capabilitytoread

are

and

timing

required

the

erase

justtoeach

during worst-

Read

relationships

to

avoid

(see

currents

mode

is

are

requiredtoensure stabilizationofthe R/W

4.1.10

When the
cuitryisdeactivatedtoprevent inadvertent

4.1.11 SPINDLE

The spindle drive
Motor
The

Motor
phaseofthe tachometer
phase
motor
eter phase-locked

errorisconvertedtoa voltage

POWE

+5V

On interface line. This

On signal turns on a current driver

drive

circuit

R-DOWN MODE

supply dropstoan

DRIVE

motorisa

output

which increasesordecreases

with

the reference oscillator

unsafe level during

MOTOR

DC

motor

motor

requires approximately one secondtoattain stabilized

voltageiscompared

thatisaddedtoa constant voltage. The

head

position

writingorerasing on the diskette.

with

an

integral tachometer.Itis

that

with

the

motor

(see

paragraphs 5.8.1 - 5.8.2).

(see

Figure 2-8).

DC

power-down, all Write

applies current

the

phaseofa reference oscillator.

speed,asrequired,tokeep the tachom-

to

and

activated

the

motor

sumisappliedtothe

by

windings. The

Erase

cir-

a separate

speed.

Any

4-4

4.2 POSITIONING CHARACTERISTICS

Head

positioningisgovernedbyfive timing characteristics:

A. Time

B.

for

asingle-track moveis25 milliseconds. Thisisthe time

to

required

Head

the

head

move the R/W

settling timeis15 milliseconds. Thisisthe time required

assemblytocease

head

oscillating after the

nominal track location following a move.

C.

Random

average

access

time
340 milliseconds (40 tracks). This
following equation:

(No.

of

tracks -

T

= +Settle Time

D.

The timetomove the R/W
is

definedasthe

or

from track 39totrack 00.

E.

Head

load

timeis50 milliseconds. Thisisthe time required

head

load armtocontact the diskette

ReadorWrite operation

timetomove the

head

begins.

between any

two

adjacent tracks.

for

head

has

achieved

(T)is298 milliseconds (35 tracks) or

timeisdetermined from the

1)

(Step time)

3

39 tracksis975 milliseconds.

head

from track 00totrack 39,

and

settle down before a

for

It

the

4.3

To

perform data transfer, the operating system mustbeabletolocate specific data
diskette.
on the diskettetoorganize data on a track

called sectors. Such a subdivision
drive tolerances

Two

DATA

such

have

FORMAT

format

schemes

been

taken into account in developing the formats.

exist; both involve detecting

and

further divide this track

can

be

achieved

by

either hard or soft sector formats. All disk

and

establishing a reference

into

smaller

areas

segments

on the

point

4.3.1 HARD SECTOR FORMAT

The controller will typically record 10 or

hard-sectored diskettes in these configurations.

16

sectors (records) per track duetothe availability

Each

trackisstarted

byanIndex pulse,

and

of

each
sectorisstarted by a Sector pulse whichispresent on connector pin J1-8. Figure 4-2 shows a
hard-sectored format. The number

of

sectorsisdetermined

by

the numberofsector holes in the

diskette.

4-5

4.3.2

SOFT

SECTOR

FORMAT

The controller may record one
pulse starts

soft-sectored format.

SECTOR

FM

RECOMMENDED

HEX

each

SEPARATION

BYTE

track,

and

DONEBYTHE

FORMAT

# OF BYTES

long

recordorseveral

a unique record identifier

(SINGLE

USING SYSTEM

DENSITY)

G1

small

+10"1_

HEX

00

16

HEX

FB

1

recordsinthis typeofformat. The Index

precedes

each

record. Figure 4·3

shows

a

UPDATE

QJ

CD

WRITE

·USER

GENERATEDBYCRC

DATA

GENERATOR

Figure 4-2. Hard-Sectored Format

(IBM OR

EOUIV)

4-6

for

Single Density

PHYSICAL

INDEX

fl

I -

REPEATED FOR EACH RECORD

I

---'

•

G2

"1

CRC I

I

I

I

SYNC I AM I

I I I I
I I I I . I

DATA

FIELD

DATAICRC

IWG

.1

OFFI

G1

I

1

I...

I

ISYNC

ID

FIELD

AM I ID

I

·1

I

I

G3 : G4A

I

I I

I

I

f"

'"

NO. OF BYTES

HEX BYTE

BINARY

UPDATE WRITE

BYTE

16

FF

CD

-

TRACK

(3)

- GENERATED BY

@ -

FB

FOR

o - USER

6

00

ADDRESS, ZEROES; SECTOR ADDRESS, ZEROES.

DATA

FIELD,

DATA.

Figure 4-3. Soft-Sectored Format (128 Bytes/Sector, 16 Sectors)

FE

CRC

GENERATOR (IBM OR

OR F8 FOR DELETED

4

CD

2

(3)

11

FF

EQUIVALENT).

DATA

I

I

I

FIELD.

6 1

00

0

128 2 1

0

(3)

FF

I 26

I

! FF

101

FF

SECTION 5

MAINTENANCE

5.1

To

establish

be

greater than 10,000 hours,

calculation.

5.1.1 MEAN TIME BETWEEN FAILURES (MTBF)

MTBF

Operating hours
the Model FDD100-5 Disk Driveis8500 hours.

5.1.2 MEAN TIME TO REPAI R (MTTR)

RELIABILITY

mean

time between failures,

and

field performance data from all field sites mustbeused

is

derived from the following expression:

MTBF =

means

Operating Hours

of

Number

power-on hours minus any maintenance times. The MTBF design

Failures

mean

time to repair,

and

service

life, operation time must

in the

goal

for

This

is

definedasthe

problems on-site. MTTR

or

travel time

5.1.3 SERVICE LIFE

The Model FDD100-5 Disk Drive

5.2 DIAGNOSTIC TECHNIQUES

Incorrect operating procedures, faulty programming,
by airborne contaminants, random electrical noise,

time when the disk driveisnot

average

for

time

foranadequately trained service engineertodiagnose

the Model FDD100-5 Disk Driveis30 minutes and

releasedtothe service engineer.

is

designed

and constructed

5-1

damaged

and

other external

does

for

a minimum useful lifeoffive

diskettes,

and

causes,

soft errors created
can

produce errors

and
not

correct

include

years.

that

maybefalsely attributedtodisk drive failure or maladjustment.

an

disk driver discloses
original diskette; then attempt

obvious misalignment or broken part, attempttorepeat the fault with the

to

duplicate the fault on a

5.3 ERROR RATES

second

Unless

diskette.

visual inspectionofthe

Errors may occur in Write,

Read,orSeek

operations. The error rate

defined in the following paragraphs.

5.3.1 WRITE ERROR RATE

of

For successful writing

or

Read

operation during the next diskette rotation.
attempts
sector
than

is

recommended.Ifa record cannot

or

track mustbelabeled defective

two

defective tracks

a record, the Write operation should alwaysbefollowed by aWrite Check

Not

more than five

be

successfully written

andanalternate sectorortrack mustbeassigned.Ifmore

are

encountered, the diskette shouldbereplaced.

5.3.2 READ ERROR RATE

IfaRead

error occurs, uptoten attempts shouldbemadetorecover data. Repositioning the
on the desired trackisrecommendedifthe error persists. The
greater than 1 in 109bits transferred. The

Read

unrecoverable error rateisnot

1012bits transferred.

for

eachofthese operations

such

Write

and

within

Read

recoverable error rateisnot

five attempts, that

greater than 1 in

is

verification

head

5.3.3 SEEK ERROR RATE

Unless

can

the stepping rateisexceeded,

be

achieved by initiating Step commands until track

greater than 1 in 106seeks.

5.4 ERROR DETECTION

Detection

and

correctionofwrite

and

seek

AND

CORRECTION

read

errorsisdescribed in the following paragraphs.

errors will rarely occur. Recalibrationoftrack location

~~

is

sensed.

The

seek

error rateisnot

5-2

5.4.1 WRITE ERRORS

an

error occurs during a Write operation,itwill

If

Read

doing a

operation commonly called a "Write Check."

be

detected on the next diskette rotation by

To

correct the error, another Write

and

Write Check operation must

be

error correction should
considered defective

5.4.2 READ ERRORS

Most errors that occur will
the data

Soft

willberecovered.

errors

are

A. Airborne contaminants that

B.

C.

andbediscardedorre-initialized.

usually

diskette surface.
the cartridge self-cleaning wiper.

Random electrical noise which usually

Small defects in the written data and/or track,

the Write operation

attempted on another track.Ifthe error persists, the diskette should

causedbyanyofthree conditions:

be

done.Ifthe Write operationisnot

be

"soft"

These

and

errors;

that

is,

by

pass

between the R/W

contaminants will generallyberemoved

lasts

which may

cause

successful after five attempts,

be

performinganerror recovery procedure,

head

and

the

by

for

a new microseconds.

not

detected during

a soft error during a

Read

operation.

Soft

5.4.2.1
recommended:

5.5

The Alignment Disk, (Dysan PIN 282 or 224/2)
ornia. This special tool

Error

A.

Reread

B.

If
the adjacent track in the
to

C.

If data

ALIGNMENT

Recovery Procedure.

the track five timesoruntil

data

are

not

recovered after performing

same

the desired track

are

not

DISKETTE

is

usedtoperform the following alignments

and

repeat step A.

recovered, the errorisnot

To

recover soft errors, the following procedure

such

timeasthe data

stepA,access

direction previously moved, then return

recoverable.

is

available from

Dysan

and

are

recovered.

the

head

to

Corp., Santa Clara, Calif-

adjustments:

is

5-3

A. R/W head radial adjustment using track 16.
B.

Index

photo

C.

Identificationoftrack zero.

detector alignment using track01and track 35.

Read

track00with

a 125 KHz

signal

(2F). This testisusedtodetermineifthe
over track
low

(true) level.

5.6

For assembly and component locations, refer

All

item numbers refertothe Illustrated Parts Breakdown, Figure

5.6.1.

REMOVAL

FRONT

BEZEL

00

when the track 0 0

USE

CARE TO PRESERVE PRERECORDED
ALlGI\JMENT TRACKS. THE WRITE PROTECT
TAB

SHOULD

THE

ALIGNMENT

ACCIDENTAL

AND

REINSTALLATION

ALWAYS

WRITING

output

BE

INSTALLED

DISKETTE TO PREVENT

ON

PROCEDURES

to

the illustrated Parts Breakdown in Appendix

headispositioned

in the interfaceisat a

ON

ITS SURFACE.

D-1

(overall view).

D.

To

remove and reinstall the

A. Close door
B.

Using a screwdriver, carefully bend the
the
off

C.

Open door

D.

Carefully push

bezel forward through

of

E.

To

two

onto

guides must

into

front

bezel,

use

the following procedure:

two

tabs located on

top

sidesofthe

the tabs on the diskette guides. (items 9 and 10)

disk drive.

reinstall, open door and push the

retainers. Close door

the tabs on the diskette guides. The

be

the notch on the

bezel

(item 26) inward and push forward

two

plastic studs on lower

two

retainers (item 75) from

and

push upper

fully

seated

bezel

in the

tabs.

two

bezel

portionoffront

plastic studs

portionofbezel

endsofthe diskette

for

the tabstolock

bottom

into

the

5-4

5.6.2

To

remove and reinstall the drive

DRIVE

A.
B.

C.

D.

MOTOR

Remove drive belt (item 25) (remove
Disconnect connector P6-2

Cut

wire tiestofree drive

Remove
attach

Remove drive

& 70).

E.

Remove drive

disk drive main frame.

F. Reinstall by reversing steps A-E and replace wire ties.

G.

Adjust

head

PWB

motor

ASSEMBLY

motor

cable connector,

and

motor

motor

speed

assembly,

fold

back main
mounting

and carefully route wires through hole in

(see

paragraphs 5.8.1 & 5.8.2).

use

the

following

from

large pulley first).

from

servo

control

motor

wires.

four

screws (item 84) which

PWB

(about 120°).

screws and washers (items 68, 69,

procedure:

PWB

(item 3).

5.6.3 STEPPER MOTOR

To

remove and reinstall the stepper

A.

Remove

B.

Remove

C.

Remove

66)

D. Remove E-ring (item 61) and washer (item 62)

of

E.

Remove stepper
in a counterclockwise
motor,todisengage head/carriage assembly.

head
four

two

that

attach stepper motor.

lead screw.

F. Reinstall by reversing steps A-E. When replacing antibacklash

and spring (item 51)itmustbepositioned
(0.0254-0,0762 cm) clearance between anti backwash
carriage. (figure 5-2).

G.

Adjust

head radial alignment

AND

LEAD

motor

cable connector and main harness connectors.

screws (item 84) which attach

screws, washers and

motor

SCREW

and lead screw,

motor

through back by gently

(CCW)

direction,asviewed

(see

paragraph 5.8.6).

use

clamps (items 64,65and

with

the

following

PWB

and remove

from

front

turning

0.010-0.030 inch

from

lead screw
back

nut

procedure:

PWB.

end

of

nut

and

5-5

5.6.4

To

remove and reinstall the head and carriage assembly,

HEAD

A. Close

B.

C.

AND

CARRIAGE

door

and remove

the

motor

Remove stepper
replacement
to

remove

Loosen screws (item 79). Move guideshaft towards the
drive

body.

of

motor

to

free head cable

ASSEMBLY

motor

motor

head and carriage assemblyitis

lead screw per paragraph 5.6.3. For

body.

from

use

the

following

cover plate (item 54) by carefully peelingitoff

not

underneath the guide shaft.

procedure:

necessary

frontofthe

Cut

from

tie endtofree cable

D.

Move carriage up and away
the head assembly.

E.

To

reinstall,
thereisenough slack in the head cabletoallow
track00and the cableisrouted properly.

F.

Align

headtocorrect track position by using alignment disk. Head
assembly
is

not

G.

Readjust track 00/39 stopifnecessary

H. Replace

5.6.5
This assembly could
install merely push the assembly, anditwill
signal

at

imum

READ/WRITE

be

track00on the oscilloscope,

signalisachieved.

reverse

willbeapproximately in alignmentifstepper

removed.

motor

HEAD

easily replaced by merely compressing the slot while pushingitout.

If

unit

from

frame.

above procedure.

cover plate (item 54),ifdamaged,

LOAD

exhibits head

PAD

turn

the pad assembly using screw driver in the slot

from

the guide rod and gently remove

Be

carefultoensure

carriagetogo

(see

paragraph 5.8.5).

use

snap

into

place. Using alignment disk, display the

flying

phenomenon, check head load force

that

motor

new part.

to

body

until

max-

(14±

To

2

grams).

5.6.6

This assembly requires dial indicators and surface plate,
replacement.

If

head load forceisnot

SPI

NDLE

HUB

proper change spring,

AND

PULLEY

ASSEMBLY.

Arm

5-6

Return (P/N 630276).

so

they

are

not

recommended

for

field

5.6.7

CARRIER

FRAME

ASSEMBLY

Removalofthis assemblyisnormally

be

required in the fieldiswhen the entire assembly mustbereplaced.

replace the carrier frame assembly,

A. Remove

B.

Remove

C.

Remove harness connector
frame and

D.

Remove

head
four

fold

two

screws (item 79)

not

requiredorrecommended. The

use

the

following

cable connector and main

procedure:

harness

screws (item 84) which attach

P11

from

LED.

wires back

off

carrier frame.
that

attach leaf hinges (item 45)

Cut

main frame.

E.

Open

door

and carefully slide the carrier assembly

of

the

unit.

To

guides towards the rear end
and slide the assembly

into

the grooves.

reinstall, reverse the procedure

Lightly

screws.

F.

Close

door

and position clutch assembly on carrier frame in center
drive hub (item 16). Tighten leaf hinge
door

does

not

bind in bezel

by

opening and closing door.Ifbinding

mounting

occurs, loosen leaf hinge mounting screws and reposition carrier frame

only

To

remove and reinstall

connectors.

PWB

and remove

wire ties on carrier

outofthe grooves in the disk

tighten leaf hinge

screws. Check

time removal would

or

PWB.

to

mounting

of

that

untilitoperates freely.

G.

Reverse

H.

Check and readjust index

5.6.8

WRITE

PROTECT SENSORS

The Write Protect sensors
devices and

normally

guide assembly,

use

do

the

following

A. Remove head cable connector and main harness connectors.

steps A-C and replace wire ties.

are

integral

not

require replacement.

timing

AND

to

the diskette guide assemblies. They

(see

DISKETTE

To

remove and reinstallorreplace either diskette

procedure:

paragraph 5.8.5).

GUIDEASSEMBLI

ES

are

electro-optical

5-7

B.

Remove

C.

Note orientationofoptical device connectors,
and remove them.

D.

Remove

E.

Remove carrier frame assembly

F.

Remove

14) and remove diskette guide.

G.

Reinstall by reversing steps A-E.
to

5.6.9 II\IDEX SENSOR ASSEIVlBLY

To

remove and reinstall index sensor assembly,

A. Remove head cable connector,

attach

B.

Note orientationofconnector on index sensor assembly and

four

screws (item 84) which attach

front

bezel

(see

two

screws (item 74) which attach diskette guide (item 9

position diskette guide when attachingitto

PWB

and

fold

back main

paragraph 5.6.1).

(see

paragraph 5.6.7).

Use

alignment

use

the

following

four

screws (item 84) which

PWB

(about 120°).

PWB

and remove

top

and

tool,

main frame.

procedure:

PWB.

bottom,

or

PIN 650160-T115

5.6.10

remove

C.

From
that
from

D.

To
remove bonding agent
similar

E.

To
transistor flange seated

a high strength, flexible adhesive. Carefully bend

(about

F.

Reinstall index sensor assembly by reversing steps A-C. Ensure

mounting surfaceissmooth and sensor

G.

Adjust

INDEX

it.

bottomofdisk drive, remove screw and washer (items

attach sensor

topofdisk drive.

remove

replace

LED

photo

tool.

photo

90°).

and set index

block

(item 37)tomain frame. Remove sensor block

transistor (item 43)

from

around

transistor, insert

into

"0"

timing

(see

into

hole and bond in place using

paragraph 5.8.5).

from

sensor block, carefully

photo

transistor usinganX-acto

sensor

blockisseated

block

with

leads

34

flatonphoto

over

that

into

main frame.

& 78)

knife

or

To

remove and reinstall the index LED,

A. Remove head cable connector,

PWB

and

fold

use

back main

the

following

four

PWB

(about 120°).

procedure:

screws (item 84) which attach

5-8

B.

Remove connector

C.

Carefully remove bonding agent

or

knife
or

D.

Insert new LED

"D"

similar tool.

leaf springs

hole and bond in place using a high strength,

from

that

attach carriertothe main frame.

into

LED

on carrier frame (item 15).

Use

caution

carrier frame

from

around

nottobendordistort

with

LED

flatonLED flange seated

flexible

usinganx-acto

carrier frame

into

adhesive.

Carefully bend lead over 90° toward outside

E.

Adjust

5.6.11

To

remove and reinstall the track00switch,

TRACK

and

set

0 0 SWITCH

index

A. Remove connector

B.

Remove

C.

Reinstall be reversing steps A &B.Adjust

5.6.12

To

remove and reinstall the servo

SERVO

A.

Remove connectors

B.

Remove

lift

two

COI\lTROL

two

out

PWB.

screws and washers (items 76, 72 & 77) and remove switch.

PWB

control

screws (item 82)

timing

from

P6-1

(see

use

micro

PWB,

and P6-2.

paragraph 5.8.5).

the

following

switch (item 32).

per paragraph 5.8.3.

use

the

following

that

attach

PWBtomain frame and

of

disk drive.

procedure:

procedure:

C.

Reinstall by reversing steps A &

D.

Check

5.8.2).

motor

speed

B.

and adjustifnecessary

5-9

(see

paragraphs 5.8.1 &

5.6.13

TO

remove and reinstall the solenoid assembly,

SOlENOI

A. Remove
B.

C.

D.
E.

D ASSEMBLY

head

cable connector and main harness connectors.
Remove
Remove head and carriage assembly
Remove carrier assembly
Note

body (item 36).

four

screws (item 84) which attach

color

codingofwires and unsolder

use

the

(see

paragraph 5.6.7).

following

PWB

(see

paragraph 5.6.4).

from

terminals on solenoid

procedure:

and remove

PWB.

F. Remove screw and washers (items

from

assembly
from

topofdisk drive.

G. Reinstall by reversing steps A-F. Ensure

is

seated in hole in main frame.

H. Check and adjust

5.6.14

All

item numbers refertothe Illustrated Parts Breakdown, Figure D-2 (clutch assembly).

To

remove and reinstall the clutch assembly,

CLUTCH

A. Remove
B.

ASSEMBLY

Remove
back

PWB

bottomofdisk drive and

head

load bail

use

head

cable connector.

four

screws (item 84) which attach

(about 120°).

80,70

(see

the

5-10

& 69)

that

lift

out

entire assembly

that

tab on solenoid frame

paragraph 5.8.7).

following

procedure:

PWB

attach solenoid

and carefully

fold

C.

With

door

on carrier (item 1).

closed, remove E-ring (item 8)

from

clutch shaft (item

2)

D. Open

E.

F.

G.

5.7

The head
this check should show no evidenceofwearordamage on either side.

HEAD

amplitude

A.

B.

C.

D.

door

and carefully remove entire clutch assembly,

from

spring (item 9)
Carefully place new clutch assembly,
spindle hub on disk drive.
Slowly
to

Reinstall E-ring

Install
Start
Select disk drive and steptotrack 34.
Sync oscilloscope external on TP5 (+Index). Set oscilloscope
to

close

doortocompress clutch spring and

protrude

AMPLITUDE

checkisvalid

motor.

measure differential signal between

through hole in carrier.

known

good diskette.

disk drive.

with

clutch spring

onto

clutch shaft. No adjustment required.

CHECK

only

when reading previously

TP1

written

and TP2. Ground probes.

allow

with

clutch

onto

the

clutch shaft

data. The diskette

Use

the

following

used

procedure:

for

E.

Set volts-per-divisionto50
per division.

F.

Write entire

G.

Measure read-back
head amplitude should

H.

Check

I.

If

output

disk drive

J.

Check head load pad

gap

slight
touching the
as

observed on the scope increases.

If

K.

steps

remains low, the head and carriage assembly must be replaced.

motor

from

PWB

between

H-J

track

with

head

speed

disk drive

and recheck.

head

topofthe

check

out

(see

millivolts

all one's.

amplitude. Average

be

200

millivolts

paragraphs

PWB

for

wear which

and pad. This

head

load arm and checkingtoseeifthe signal

but

average

5.8.1-5.8.2).

looks inappropriate, change main

(See
minimum

and timebaseto20

minimum

peak-to-peak.

would

cause

canbechecked by very

paragraph 5.8.3

read-back head amplitude

5-11

milliseconds

read-back

soft

failure mode, i.e.,

for

adjustment.

lightly

5.8 ADJUSTMENT PROCEDURES

This subsection provides eight

assembly

or

componentinthe

0

e

J3

P3

TP7

II

adjustment

procedures

disk drive. Test

DTP1

lITP3

DTP2

TP5

II

that

may be necessary after replacementofan

point

locations are showninFigure 5-1.

0

o

2

II

TP4

J1

TP8

D

TP9

TP6D D DTP10

Figure 5-1. Test Point Locations

5-12

COM

o

+5

5.8.1 MOTOR SPEED ADJUSTMENT WITHOUT FREQUENCY COUNTER

This adjustment procedure

A. Insert a diskette, energize disk drive,

to

track16and

B.

Adjust potentiometer R7, on
spindle pulley appear motionless. For 60 Hertz power,
outside ringoflines.

C.

A one percent
rotating 90

canbeused

keep

speed

0

in five

only

where thereisfluorescent lighting:

and

start motor. Step

head

loaded.

servo

control

PWB

until lines

use

For

50 Hertz power,

use

inside ring.

variationisexhibited by the strobe lines

seconds.

head

on

5.8.2 MOTOR SPEED ADJUSTMENT WITH FREQUENCY COUNTER

This adjustment procedure

canbeused

anywhere a frequency counterisavailable.

A. Install a soft-sector scratch diskette.
B.

Start motor, load head,

C.

Connect frequency countertoTP5 (+Index) on main disk drive

D.

Adjust potentiometer

and

steptotrack 16.

R7,onservo

control

PWB,

for

200±.1 milli-

PWB.

seconds.

5.8.3 READ/WRITE

To

adjust the read/write head-load pad,

A. Insert

HEAD·LOAD

an

Alignment Disketteorany diskette

track 34.

B.

Connect oscilloscopetoTP1

on TP5 (+Indexl.

C.

Select disk drive

D.

Observe
head-load

read-back
not

Read

pad
head

less

than 200 millivolts peak-to-peak.

PAD ADJUSTMENT

see

Figure 5-2

and

and

step

head

signal

on oscilloscope while rotating read/write

CCW

in small increments (10

and

use

the following procedure:

with

TP2

and

sync external positive

carriagetotrack 34.

degrees)

data on

until maximum

amplitudeisobtained. The amplitude should

be

5-13

.010+.005
(.0254.:!: .0127 CM)

IN.

HEAD

LOAD

ADJUSTMENT

PAD

--~~

__

-.OlO-.030

TRACK00STOP

IN

o

STOP

MOUNTING

SCREWS (2)

5.8.4

To

adjust

TRACK

the

track

Figure 5-2.

00 SWITCH ADJUSTMENT

00 switch

Track

position,

00/39

Stop

see Figure 5-3

and

Head-Load Pad

and

use

the

A. Powerupdisk drive and insert an Alignment Diskette.

B.

Steptotrack

Loosen

C.

Adjust

track00switch position,bymoving its

direction

D.

Observe a high signalatTP8
Signal levelatTP8
from

hightolow

E.

Steptotrack

F. Readjust

between

states

00.

This should energize Phase A on

track00switch

mounting

brac.ket.

as shownbyarrow, until switchisjust

with oscilloscope.

should switch

does

not

occur, readjust track00switch position.

00. Signal levelatTP8

from

hightolow.Iftransition

should switch from lowtohigh.

track00switch positiontotransfer

track00and

track

01,

then

mounting

Steptotrack

both

secure

Adjustment

following

stepper

activated.

open

mounting

procedure:

motor.

bracket,

01.

and

closed
bracket

in

of

track00switch.

5-14

SWITCH
SCREWS

MOUNTING

(21

5.8.5

To

adjust track

TRACK

00/39

Figure 5-3. Track00Switch Adjustment

00/39 STOP

stop

(see

Figure 5-2),

ADJUSTMENT

use

the following procedure:

SWITCH
BRACKET

CARRIAGE

MOUNTING

ARM

A. Unplug

interface and

B.

Step selected disk drivetotrack 00.

C.

Adjust

head

cables and remove

PWB

connectors installed.

PWB

from

disk drive.

track 00 stop until distance between track00stop and
post on main frameis0.010 ± 0.005 inch (0.0254 ± 0.0127 em).
This task
plastic strip between the stop and post

canbesimplified

by

using a

.010"

thick

and

pushing the stop

mylar or other

against the plastic strip. Remove plastic strip after tightening
screws.

D.

Steptotrack 39 and verify clearance exists between track
stop and post on main frame.

E.

Reinstall disk drive

PWB

and

plug in

head

cables.

5-15

Leave

00/39

5.8.6 INDEX/SECTOR

To

adjust index/sector timing,

an

A. Insert

B.

Start

C.

Sync oscilloscope

Alignment Diskette.

motor

TIMING

see

ADJUSTMENT

Figure 5-4

and

and select disk drive.

with

external positive probe on TP5tomonitor

use

the following procedure:

+Index

signal, then set time

D.

Connect probetoTP1
On oscilloscope, set inputs

base

on oscilloscopeto50 microseconds/division.

and

TP2

and

ground probes.

to

AC

and

set

vertical deflection

500 millivolts/division.

E.

Steptotrack

F.

Observe timing between startofsweep
be

200±.100 microseconds.Iftimingisnot

with

adjustment.

G.

Loosen mounting screw in appropriate Index Sensor block until

assembly

H.

Observe
50 microseconds.

.1;31.

is

just abletobe

timing

and

and

first data pulse. This should

within

moved. Thisislocatedonbottomofdisk drive.

adjust Index Sensor position until timingis200

Verify

that

detector assemblyisagainst registration

surface.

I. Open

J.
K. Recheck timing

and

close door; then, recheck timing. Repeat

Tighten mounting screw slowly. Do

to

ensure Index Sensor did

screw

was

tightened.

not

overtighten.

not

move when mounting

to

tolerance, continue

several

times.

±.

INDEX

SENSOR

MOUNTING

SCREW

Figure 5-4. Index/Sector Timing Adjustment

5-16

5.8.7

To

radially align the head,

RADIAL

A
B.

ALIGNMENT

use

the

following

Start

motor

InsertanAlignment

and select disk drive.

OF

Disk.

HEAD

procedure:

Alignment

Disk shouldbeat the

same
environmental room conditionsasdrive
alignment.

C.

Sync oscilloscope external positive
time

base

on oscilloscopeto20 milliseconds/division. This

of

provides a display

D.

Set oscilloscopetomeasure
Ground probes, set inputs
miIlivolts/division.

E.

Steptotrack

1.

PhaseAof
pattern on the diskette. This
phaseisactive

F.

Step disk drivetotrack 16.

G.

Loosen

H.

Rotate stepper
pattern on oscilloscope
carefully

00. Insure
stepper driver logicisactive, 2.

two

mounting

lock

down

one diskette rotation.

to

that

with

the

correct track number.

screws

motortomove

until

two

previously loosened stepper

for

at least one

with

probe on TP5 and

differential

AC, and set vertical deflectionto100

the

following

will

that

head

the lobes

signal between

conditions both exist:

insure

that

hold stepper

radially in and

are

within

TP1

the

proper stepper

motortomain frame.

80%ofeach

hour

before

set

TP1

and TP2.

& 2 indicate a 2F data

out

and observe cat eye

motor

mounting

motor

other, then

screws.

I.

Check adjustment by stepping
from

track 16 and returntotrack 16.Ifnecessary, readjust by

5.8.8 repeating steps G and H,
J.

After

radial alignmentofheadiscompleted, track00switch and

T stop position mustbechecked and adjustedasrequired

5.8.4

& 5.8.5).

5.8.8

To

adjust the head-load bail,

HEAD-LOAD

A.

Select disk drive and load headtoenergize head-load solenoid.

B.

Adjust
bracket

0.0254 cm) clearanceisobtained between lower sideofhead-load bail

BAI L

ADJUSTMENT

see

Figure 5-5 and

two

screws

to

head-load solenoid

that

hold

off

several

until

cat eye patterniswithin

use

the

diskette load arm and arm adjustment

until

5-17

tracks in

following

0.19 ± 0.01-inch (0.4826 ±

both

procedure:

directions

80%ofeach

track

(see

paragraph

other.

00/39

and platen on main frame casting.

top

carriage clears

from

C.

If
(see

tracks 00 through 39.

bail cannotbeadjusted, head-load solenoid mustbereadjusted

paragraph 5.8.9) .

•

19

±

(.4826

sideofbailbyat

.01

IN.

±

.0254

Verify

that

least 0.015 inch (0.0381 em)

(SOLENOID ENERGIZED)

CM)

head-load arm on

-..-1,104--

.015

IN.

(.0381

MINIMUl-1

HEAD LOAD

BAIL

CM)

Figure 5-5. Head-Load Bail Adjustment

5-18

5.8.9

To adjust the head-load solenoid,

HEAD-lOAD

A. Unload head-load solenoid

SOlENOI

D ADJUSTMENT

see

Figure 5 - 6 and

and

use

the following procedure:

open doortolift

head/carriage

assembly

B.

Using a small screwdriver or similar tool,
on
increase travelorouttodecrease
travel measured at center
solenoid center).

C.

Adjust head-load bail

arm

off

head-load bail.

bottomofdisk drive

(see

and

of

paragraph 5.8.8).

reach

through

bend

tabonsolenoid frame in

travel. Adjustto0.090 ±

head-load bail (0.95 inch from

/ Adjustment tab

access

/

to

.01

hole

inch

Figure 5 - 6 Head-load Solenoid Adjustment

5-19

APPENDIX A

SPARE PARTS LIST - MODEL FDD 100-5 DISC DRIVE

Part Number
650281-001

640204-001
630321-001
630300-001
650168-001
650166-001/002
640181-001/002

640181-003/004

640162-001

640155-001
630258-001
630289-001
617500-001
650199-001

Description

PWB,

Assembly,
Assembly,
Assembly, Spindle Drive
Assembly, Stepper

Assembly,
Assembly, Carrier (Single/Double LED)
Assembly, Diskette Guide, Right

LED &

Assembly, Diskette Guide,

LED &

Assembly, Index Sensor
Assembly, Head-Load Solenoid
Assembly, Head-Load
Belt, Spindle Drive
LED, Status Indicator
Bezel

sensor)

sensor)

Front

Main

PWB,

Servo Control

Head

Carriage

Motor

Pad

Motor

Left

Spare

Spare

(with/without

(with/without

640186-001
618808-001
618550-006
650190-001
618417-001
630396-001

Door

Switch, (Track
Shunt, Programmable
Assembly Clutch

Termination Network

Motor

Cover Plate

00)

A-1

APPENDIX B

Assembly,
Assembly,

ASSEMBLY DRAWINGS

Title

PWB,

Main

PWB,

Servo Control

MODEL FDD100-5 DISK

AND

MATERIAL

DRIVE

LISTS

INDEX

Dwg. No.
650281-100
640204-100

Page

B-3

B-4

B-1

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B-4

APPENDIX C

LOGIC SCHEMATICS

Title
Schematic Diagram, Model FDD100-5 Disk Drive
Schematic Diagram,

Motor

Control

Dwg No.
650284-100
630322-100

Page
C-3
C-5

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I

APPENDIX

D

Figure
D-1
D-2
D-3

ILLUSTRATION

IPS

Model
Model FDD100-5 Disk Drive ­Model FDD100-5 Disk Drive - Carriage Assembly

FDD100-5

Disk Drive - Overall

Title

INDEX

Clutch

View

Assembly

Page

D-3
D-7
D-9

0·1

~

..

:>

~

..

>

0

I

(\

..

.

~

.:;

...

..

a

lD

on

0

~

a
a

u.

a;

...,

::E

a

u:

I

0

,

:!

:>

'"

D-3

IPB LIST - MODEL FDD100-5 -

OVERALL

VIEW

ITEM

NO.

1,//;1;/;1/

1
2

3

4

5 6 3

6

7
8 6 4
9 6 4

10

-11
12
13
14
15

16

17

18
19
20 1 0
21
22 6 401 4
23
24
25
26
27
28

29
30
31
32
33
34
35
36

37 6 401

-38
39
40 6 1
41
42 6 1
43

6 5
6 5
6 4
6 5

6 3

6 5 0

6 4
6 5

1

0
0

2

0

2 0

016

0 3

3 0

0

1
1

0
016
016
0

2 8

o 1

6 5

6 3 o 3 o 1

o 1

6 4

o 1

6 4

6 4 o 1

6 1

o2

6 4

o1

0

1 001

6 4

0
6 3 027 3
6 3 0
6 5 0
6 401
6 4

6 4 1

~

6 3

0 2 6 4 - 0

6 4

b

6 1

8

6 401 4
6 3

0
6 3
6 1

~

6 1

3

6 1

3 5 5 0
7

6 1

0
7 8

6 1

9

PART

8

9

8 1

14

18

2 1

P

{)

6
5

~
~

~

~

8

4
4
4

0

4 3

p

o 1

3

1

7

8 9

12

1

9 9
8 6

1

5

5

1 6 1

8 0 8

7
6

~

3 0

8 5 - 0

~

o0
o 2 - 0

5

7

o0

1 1
1 1

4

NO.

001

-

001

-

o 0

-

o 0

-

0(11

-

o (I

-

001

-

o

-

o
o0

-

o0 4

-

*

* * * *

0

- 0

- 0
8 - 0
8

- 0
8

- 0

- 0

2

- 0

- 0
4

- 0
8

- 0
9

- 0

- 0

- 0

- 0

- 0
6

- 0
6

- 0

- 0

- 0

2 - 0

8

- 0

1

- 0

- 0

2

- 0

- 0

- 0

- 0

- 0

1
1

1

(I

1
1

Oi

2

o 1
o 1
o 1
o2
o3
o2
o 1
o4
o3

o4

o 1
o 1

o 1
o 1
o 1
o 1

o2 Arm,

o 1
o 1
o 1

o

~

o 1
o 1
o1

o 1

o3

o4

o 1

o 1

o 1

o 1

/

DESCRIPTION

Main
Assembly,
Assembly,
Assembly,
Assembly,
Assembly,
Assembly,
Assembly,
As
Assembly,
Assembly,

Carrier,
Hub.
Shim,
Shim,
Shim,
Bearing
Spacer,
Ring,
Washer,
Shim,
Pulley,
Label,
Belt,
Bezel,
Door

Arm,

Spring,

Plate,

Micro-Switch,

Arm,

Pad,
Bracket,

Solenoid

Index
Tie,
Tie
LED,
Bumper
Ground
Photo

Frame,

sembly,

COMPONENT

Machined

Drive

Small
Small
Small

Bearing

Retaining

Wave

Large

Hub-Machined

Strobe

Drive

Front

Disk
DiskProtect

DiskProtect

Switch

Di

skette

Diskette

Arm

Block

Restraint

Base,

Emitter

Lug

Transistor

Cable

Machined

PWB

Carrier
Solenoid
Guide-Disk
Guide-Disk

Protect

(Main)

PWB

(Servo)
Carriage
Drive
Stepper

Harness

Motor

Dia.
Dia.
Dia.

Dia.

Mount

SPDT
Load
Load

Adjustment

.001
.003
.005

(Right)
(Left)

Motor

PARTS

.i/f/.so

(Right)
(Left)

z.fz.'/Stt

* * * * *

SHEET

FIGURE

1 OF 2

NO.

D-l

D-l

>-

....

-

Z

4(

:»

0

1
1
1
1
1
1
1
1
1
1
1

1
1

AIR
AIR
AIR

2
1

2
1

3

1
1
1
1
1

1
1

2
1
1
1
1

1
1
2

3

1

4

1
1

4

-Not

Shown

D-5

IPS

LIST-MODEL

FDD100-5-OVERALL

VI

EW

ITEM

NO.

44
45

46

47

48
49

50

51
52
53
54

55

56

57

58
59
60
61
62
63
64
65
66

67

68
69

70
71
72

73

74
75
76

77

78

79

80
81
82
83
84
85

PART

E~~(;

6 1 7 5 0 0 - 0 0 1
6 3 0 2 6 3 - 0 0 1
6 3 0 2 7 7 - 0 0 1
6 3 0 2 9 8 - 0 0 1
6 1 0 9 5 8 - 0 0 1
6 1 3 1 1 1 - 0 0 2
6 4 0 1 6 0 - 0 0 1
6 3 0 3 2 5 - 0 0 1
610205
6 3 0 2 9 9 - 0 0 1
6 3 0 3 9 6 - 0 0 1
6 5 0 2 1 3 - 0 0 1
6 4 0 1 6 5 - 0 0 1

6 1 2 7 5 0 - 0 0 4
6 1 3 8 0 4 - 0 0 8
6 1 2 7 5 3 - 0 0 1
1 0 0 0 4 1 - 2 0 5

613800

6 1 0 9 5 2 - 0 0 2
6 1 3 0 0 5 - 3 0 4

6 1 3 0 0 0 - 3 0 6
6 1 3 8 0 0 - 0 0 4
6 1 3 8 0 3 - 0 0 4
6

1 0 0 0 4 2 - 2 0 0
6 1 2 7 5 1 - 0 0 1
6 1 3 0 1 1 - 2 0 6
6 1 1 3 0 1 - 0 0 1

1 0 0~3 6 - 2 0 9

1 0 0 2 5 1 - 2 0 0
6 1 3~0 6 - 0 0
6 1 3

6 1 3 0 0 0 - 3 0 8

100036
100036
6 1 3 8 0 7 - 0 0 1
100036
6 1 3~0 4 - 0 0 6

1/////

130

~

NO.

/

DESCRIPTION

/;

Indicator,
Hinge,
Clamp,
Clamp,
Clamp,
Shaft,
Nut,
Spring,

-

002

Bearing,
Spring,
Plate,

Motor,
Stop,

Carriage

* * * * * ATTACHING

Ring,

Washer,

Ring,
Screw,

-

00

3

Washer,

Clamp,
Screw,
Screw,

Washer,

Washer,

0 5 - 2

1 1 - 2 0 4

04

-

204

- 3

04

- 2 0 6

Screw,

Washer,

Ring,
Screw,

Fastener,
Screw,

Washer,

~

Washer,

Screw,
Screw,
Screw,
Screw,

Washer,

Screw,

Washer,

LED - Red

Leaf

Guide
Guide
Cable

Carriage

Nut-Carriage

Flanged

Stator

Cover

Stepper

Track

Retaining

Flat

Retaining

Soc

Flat

Motor
Button
Phillips

Flat
Split

Button

Split

Grip

Hex

Tubular

Phillips

Flat

Flat
Hex
Phillips
Phillips
Phillips

Teflon

Phillips

Flat

Shaft
Shaft-Stop

Guide

00/39

PARTS

Hd

Gap

(#4)

Hd

(8-32x1/4)

Rec.

(#6)

Lock
Hd

(6-32x1/4)

Lock

Hd,

Thread,

Type

Rec.
(#4)
(#4)

Hd,

Thread
Rec.
Rec.
Rec.

Rec.

(#6)

* * * * *

(4-40x5/16)

(6-32x3/8)
(#6)
(#4)

Forming

(4-40x9/16)

Forming
(6-32x1/2)
(4-40x1/4)
(6-32x1/4)

(4-40x3/8)

(4-40)

(4-40)

SHUT 2

FIGURE

NO.

D-1

D-1

OF

2

z

~

j

o

1
2

1
1
1
1

1
1

2

1
1
1
1

1
1
1

2
2

2

1

2

3
3

2

6

2

6

2
2

2

4

7

1

4

2
2

6

1

D-6

"\

~--

{)

J)

U.

Q.l

....

::::l

C'l

D-7

IPB

LIST - MODEL FDD100-5 - CLUTCH ASSEMBLY

ITEM

NO.

1

2 6

3 6 4 o 1 8 2

4
5 6

6
7

8

9

c.,c.,~

c.,c.,0

"I{"I{Q.

~~

Q.q)~

0'::>0

....

"'v

6 5 0 1

302

6

3 0
4

o 1 8 4

1 0

6

4 0 1

6

1 2 7

6

1 3 2

6

PART

1J

2
2

NO.

I

1/;111

8 0
6 2

7

o 5

4 8
5 0
5 0

-

-

-

1

-

- o 0

-

- o 0 3

-

-

o0
o0
o0

o0
o0
o 0

o 0 8

1

CarrierIMachined

1

Shaft

1

Cone

1

SpringICone

1

Cone

1

Bearing

ShimI.005"ISm.
RingIRetaining

2

SpringIClutch

DESCRIPTION

Thrust

Follower

Dia.

SHEET 1

FIGURE

NO.

D-2

D-2

OF

~

...

-

z

c(

~

0

1
1
1
1
1
1
1

2

1

1

D-8

M

odel FDD1 -Figure D-3.

00

5 - Carriage Assembly

D-9

IPB

LIST-MODEL

FDD100-5-CARRIAGE

ASSEMBLY

SHEET 1

OF

1

ITEM

NO.

1
2

3

4

5

6

7

PART

E~fJ1////////

o 1

6 5

6 5 0 1 9 8
6
6 3 0 0
6

1

6

o 1

4

3 0 2

000

1 2 7

6

NO.

9 - 0

-

- 0

5 8

7 5

-

6

7

-

4 5 - 2

5

3

-

o I

o 1

0

o 1

002

o 1

0

2

o 1

0

Assy.,

Arm,

Button
Pad
Spring,
Pin,

6

Ring,

/

Head

Dowel

DESCRIPTION

Carriage

Load

Arm

Return

Retaining,

and

Read/Write

Push-on

Head

FIGURE

NO.

D-3

D-3

>-

....

-

z

4(

::»

0

1
1
1
1
1
1
2

D-10

OEM DIVISION

1440

Allee
Anaheim,
(714)
Telex

Street

California

991-9700

685691

92805

This
or its
to

others

document

contents

without

may not be

used_or

express

communicated

Subjecttoalterations

duplicated

authority

SIEMENS AKTIENGESELLSCHAFT

A22742·A1005-X001-'
AG979-1.0

Printed in

9/79

USA.

-7630