Teac FD-55 Series Instruction Manual

-

MINI

FLEXIBLE

DISK

DRIVE

INSTRUCTION

MANUAL

TEAC

FD-55(L)

MINI FLEXIBLE DISK

INSTRUCTION

MANUAL

DRIVE

P/N

10131159-0CA

-

1.

-

TABLE

OF

CONTENTS

2-1

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

INSTRUcrIONS
2-

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

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

Disk
Disk
Write
FDD

Installation

Precautions

Precautions
Connector

Setting

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

Handling

Protect

Handling

Signal
Power
Frame

Terminators
Straps

Title

FOR

HANDLING

...........

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

~

........

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

and

Ejection

for

Transportation

FOR INSTALLATION

for

Installation

and

Cable

connector
connector
grounding
of

Straps

and

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

Connection

and

aria

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

and

interface

of

Disk

... ~ ...............•..................

cable

cable

Terminator

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

drivers

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

..................••.................

........................•..........

.........................•.•.........

...........•................•...•

"

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

~

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

............•...................

.............•...........•....

Page

201
201
205
209

.

210

.

211
213
214
214
216
217
221
223

225
226
229

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

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

5 WRITE/READ
2-5-1
2-5-2

Turn-on
Rotating
Operating

Inductive

Front

CONTROL P ROCEDURE

POWER

SUPPLY

Power

Internal

Current

Single
Double

conditions

conditions

conditions

Noise

Bezel

On

Density
Densi

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

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

and

Current

Consumption

METHOD

ty

of

front

of

of

in

Installed

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

Off

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

Consumption

Timing

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

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

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

spindle

head

Environment

of

Chart

bezel

motor

load

the

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

indicator

........•........•.........

solenoid

FDD

...........•.........

•........................

.........•................

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

237
240
242
244
248
2

50
255
255

257
261

264

265
267

-

ii

-

2-1.

INSTRUCTIONS FOR

The
to

TEAC

as

FDD)

FD-55(L)

does

HANDLING

series

not

require

mini

flexible

specially

disk

delicate

drive

(hereinafter

handling

as

long

referred

as

it

is

2-1-1.

handled
The

same
Read
or

through

system

Disk

Two

(hereinafter
One
by

means

records

The
disk

Fig.20l
that

according

care

design

types

is

hard

an

FD-55

is

used

shows

the

as

other

and

referred

so

are

commercially

referred

sectored

of

sector

identification

may

be

only

the

hard

sectored

to

that

used

for

external

the

similar

to

method,

holes.

with

some

following

to

this

the

FDD

available

as

disk)

The

pattern

either
specific

view

disk

has

mini

Instruction

can

which

other

of
the

instructions.

flexible

show

for

the

5.25

according

detects

is

soft

on

the

initial

type

of

applications.

the

disks.

same

number

disk

Manual
expected

to

each

sectored

disks.

drives

inch

the

sector

position

The

of

is

before

performance.

(mini)

sectoring

photo-electrically

method

Generally,

only

difference

sector

required.
your

operation

flexible

of a track.

which

of

each
hard

holes

sector.
sectored

as

disks

is

the
number
The

of

disk
polyethylene
in a vinyl

-the

disk
driving
with

the

(index
In
high

window).

order

quality

sectors,

itself

chloride

surface.

window

disk

to

maintain

on

film

(central

(head

disks.

on a concentric
which

with

The

coated

jacket

jacket

data

with

window),

window),

high

data

-

are

magnetic

liner

has

oval

and

index/sector

reliability,

201

circle

recorded

surfaces.

to

open

areaSi

window

-

together

is

retain

for

it

made

The

dust

disk

magnetic

hole

is

recommended

with
of

an

80~

disk

without

positioning

head

detection

index
thick
is

protected

damage

window

to

hole.

and

disk

contact

use

to

133.3mm
(5.25

in)

.-

Central

Notch

I

,

I

I

I

I

I

I

/

/

/

/

"

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window

window

(write

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co

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o

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enable

Index

notch)

window

Innermost

track

I

I

,

,

\

Soft

,,-

/

"

/

Outermost

sectored

(Fig.201)

disk

External

track

Sector

Hard

view

of

disk

-

202

-

(16

holes

sectored

sectors)

disk

There

are

many

types

in

the

commercially

available

soft

sectored

disks

(1)

(2)

which
appropriate

Oata

recording

Single

Da

not

Expected

A

double

All

the

density

Number

Single
1

can

be

are

classified

one

density

density

(FM

use a single

data

reliability

density

models

of

recordings.

of

used

sided

sides

(only

used).

according

for

your

method)

density

disk

can

FD-55A~F

side

0

to

application.

or

Double

disk
will
be

are

can

not

used

be

for

used

used)

the

be

for

following

density

a

double
obtained
a

single

for

both

or

(MFM

double

factors.

method)

density

and
density

single

sided

recording.

error

and

Select

may

occur.

recording.

double

(both

sides

the

0

most

and

Use a double
is
degraded.
A

double

(3)

Track

48tpi

It
density
reliability
Though
cause

used

for a double

sided

density

or

96tpi.

is

recommended

of

such

practical

sided

an

might
an

FOO.

disk

sided

disk

can

to

use a disk

If

be

degraded

application

problem,

for a double

FDO, data

be

used

a

48tpi

disk

rarely.

of

using

it

is

not

-

203

for

of

the

thoughtful

-

sided
reliability

a

single

same

is

used

a

96tpi

FDD.

sided

track
for

disk

to

If
of

density

a

96tpi

for
use

a
the

FDO.

a
in

single

side

as

FOO, the

48tpi

that

sided
1

might

the

FOD
way.

disk

track

data

does

be

not

(4)

Track

Same

35

tracks

numbers

of

commercially

from

track

available
00

to

34.

48tpi

And

single

35

track

sided

disks

FOOs

are

can
used

access

by

only

same

(5)

people
The

operation

40

tracks).

are

not

Almost

40

tracks.

High

density

For

the

use

an

Generally,

Da

not

degraded.

in a few

However,

guaranteed

all

the

disk

high

density

exclusive

disks

use

an

application.

of

the

when a 35

disks

HO

written

HO

disk

FO-55A

the

data

commercially

FDD

(FO-55G)

disko

Da

by

with

FO-55A ~ F.

is

guaranteed
reliability

track

available

which

not

use

an

FD-55A ~ F

disk

is

is

disks

The

for

of
used.

are

put

for

cannot

da

track
five

00

tracks

guaranteed

to

practical

FO-55A ~ F.

be

read

ta

reliability

through

from

for

by

use

an

may

39

<total

35

to

up

to

recently,

FD-55G.

be

39

-

204

-

2-1-2.

Disk

Handling

Disk
precautions.

(1)

Oe

(2)

Oe

the

(3)

Oe

the
For
area

Opening

not

not

normal

not

disk).
manual

Disk

areas

is

aprecision

tear,

install

touch

in

Fig.202.

(Jacket)

fold,

a

read

the

Fingerprints

handling

of

jac

or

damaged

or

write

opening

ket

recording

distort

disk

media.

the

in

operation

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of

the

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of

on

disk,

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recommended

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sure

or

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damaged

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to

the

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coating

hold

area

enable

only

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the

following

disturbs

FDD.

area

label

notch

of

(4)

Return
whenever
outside

(5)

For a long

the

Far

a

(Fig.202)

the

of

envelope
a

short

container.

it

disk

is

the

term

in

term

Protective

to

its
removed
protective

storage,
an

upright

storage,

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not

envelope
from

lean

envelope

the

envelope

keep

position.

a

few

the

-

for

FDD.

the

disks

disks

205

the

such

disk

-

and

label

protection

The

disk

as

on a desk

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may

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place

area

of

of

even

horizontally

any

the

the

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container

heavy

disk

area

left

with

without

objects

(6)

such

Keep

as

and

books

use

on

the

the

disk

disk,.

away

which

from

will

dust.

cause

Also

distortion

do

not

install

of

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a

disk.

dusty

(7)

(S)

(9)

(10)

disk

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such
surface.
as a feIt

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the

D6

the

Index

data

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as a lead

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errors

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tip

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on

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point

to

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carried

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the

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to

life

of

jacket

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on a label

to

stick

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area

the

magnetic

the

disk

will

with

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may

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label

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shown

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distorted.

damage

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after

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in

Fig.202.

head,

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tipped

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Rubbish

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FDO.

object

disk

disk

writing

such

from

(lI)

(12)

(13)

{14}

Da

not

Keep

motors,

ambient

Da

not

it

damages

Da

not

the

disk

electric

Disks

apply

the

smear

expose

should

more

disks
etc.
stray

the

the

away

apparatus

be

than

away
These
magnetic

disk

magnetic

the

disk

from

heater

such

operated

from

may

with

two

magnetic

degrade

field

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to

sunlight,
or

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labels

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stove.

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set.

-

on

the

fields

the

recorded
not

of

the

micro-waves,

Also

the

following

206

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such

disk.

same

•

such

exceed

as

do

area

.

as

by

data

not

on

50

Oersted.

thinner,

or
put

conditions:

magnets,

the

disk.

freon,

infrared

the

disk

transformers,

The

or

alcohol,

ray.

on

Keep

the

Ambient

temperature:

10°C ~ Sl.soe

(50°F ~ 125°F)
Relative
Wet

The
operating
required
FDD
Generally
limit
good

performance

Also a sudden

within

(15)

Disks

Ambient

humidity:

bulb

above

temperature:

temperature

condition,

against

assembled

upper

of

the

contact

the

should

temperature:

20\ ~ 80\

the

in

a

host

limit

jacket

material

between

characteristics.

change

specified

be

stored

29°C

applies

(84°F),

to
approximately
operating

system

of

the

temperature
because

the

disk

in

environmental

and

range.

within

the

4°C ~ sl.soe

Max.

the

jacket

15°C

limit

into

taking

consideration.

the

the

magnetic

conditions

following

(40°F ~ 125°F)

surface.

of

temperature

the

is

determined

jacket

conditions:

temperature

deformation

head

which

should

In

the

margin

by

adeformation

may

be

avoided

actual

is

rise

disturbs

degrade

in

the

even

Relative

(16)

For
recommended

outer

stray

Disks

Ambient
Relative
Temperature

(17)

Disks

exceeding

Such

humidity:

transportation,

that

surface

magnetic

should

be

temperature:

humidity:

gradient:

which

have

the

disks

should

8% ~ 80%

a

sufficient

of

the

fields

transported

8% ~ 90%

been

operating

be

disks

should

space

final

will

container,
be

negligible.

within

-40°C ~ sl.soe

20oe/hour

stored

or

conditions

subjected

to a conditioning

be

in

the

exists

so

the

following

(-40°F

transported

may

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protective
between

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~

125°F)

at

the

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of

conditions:

temperature
degradeed

period

container.

recorded

damage

and

perfQrmance.

of

not

disk

due

humidity

less

to

It

is
and

than

-

207

-

(18)

24

When

hours

you

within

install

the

the

operating

disk

to

environment

the

FDO,

be

prior

careful

to

to

use.

handle

it

slowly.

Rough

may

installation

cause

incorrect

will

accelerates

installation.

the

degration

of

the

disk

and

it

-

208

-

2-1-3.

Write

A

write

For

Proteet

enable

reeording

noteh

new

data,

is

loeated

use a disk

on

the

with

right

the

side

noteh

of
in

the
the

disko
eondition

shown
installed
magnetie

To

proteet
errors,
Writing
eannot

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eareful
whenever
not

be

should

in

Fig.201

in

head

eover
or

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you
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be

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response

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the

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to a write

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erroneous

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the

side

eovered

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When a

enables

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209

protect

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(B)

tab

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2-1-4.

(1)

FOO

Handling

The

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Inserting

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be

handled

ejecting

according

procedure

to

the

of a disk

following

should

instructions.

be

performed

according

Insert

(2)

A

sudden
relative
within
at

the

environmental

(3)

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(4)

Remove

time.

(5) Keep

by

transformer,

a

the
new

and

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to

item

disk

correctly

change
humidity

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condition.

use

the

disk

FOO

away

2-1-5.

in

environmental

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range.

condition

FOO

away

from

the

from

stray

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from

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CRT

carefully.

conditions

avoided

Sufficient

if

there

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when

it

magnetic

display,

as

and

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etc.

such

far

as

possible
hours
was a

of

sudden

damp.

not

be

or

electromagnetic

as

temperature

even

storage

change

operated

or

if

it

is

required

in

the

for a long

fields

such

is

as

(6)

(7)

(8)

If

such

data

errors

Refer

Da

FDD

For

to

to

,not

except

transportation,

the

apart

item

touch

FDD.

or

the

for

or

equipment

degrades

2-2

for

variable

trained

data

installation

resistors

technicians

refer

to

is

not

reliability.

item

-

2-1-6

210

sufficiently

Refer

of

the

FOD.

or

screw

concerning

not

-

shielded,

to

adjusting

FD-55.

to

apply

it~

2-2-4.

parts

excessive

it

may

in

impact

cause

the

2-1-5.

Installation

and

Ejeetion

of

Disk

LED

indieator

Front

bezel

Write

proteet

noteh

Front

lever

Head

window

(1)

Installation

(a)

(b)

(e)

Set

the

Take

Hold
head
loeated
If

the

while

(Fig.204)

of

front

out a disk

the

label

window

FDD

the

at

faeing
the
is

label

Inserting

disk

lever

from

side

the

LED

indieator

installed

side

to

its

of

goes

the

the
inner

direetion

position

proteetive

disk

side
side.

horizcntally

left

side

-

211

and

and

-

of

shown

envelope.

insert

with

(Fig.204)

when

the

the

in

it
the

disk

Fig.204.

into

write

,

the

FDD

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the

FDD

enable

label
installed

with

noteh

side

the

goes

up,

(d)

(d

l

vertically

Insert

)

For

the

the

models

with

disk

front

fully

with

lever

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disk

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straightly

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a

the

light

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with

depressing

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force

care.

is
required
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When
sure

(e)

Take
turning

aution:Never

(2)

Ejection

(a)

Turn
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for

the

it

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insert

off

your

90°

elose
fingers.
be

damaged.

of

the

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If

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from

clockwise

front

disk

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is

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disk,

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direction.

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with

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two

the

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the

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direction

fingers

point

be

front

disk

to

not

lcm,approx.

heard.

lever

with

the

open

to

by

your
disk

the

apply

Be

may

(b)

(~)

(e)

excessive

Hold

For
the

Put

from

the

the

the
lever

the

impact.

rear

FDD.

models

is

disk

side

with

open.

back

of

into

the

disk

eject

the

disk

with

option,

protective

-

212

-

your

disk

envelope

fingers

pops

lightly

out

(See

and

from

Fig.202l.

the

draw

FDD

out

when

2-1-6.

(I)

Precautions

The

following

of

the

FOO

In

order

to

for

and

protect

Transportation

precautions

the

system

the

should
in

which

magnetic

be

the

head

referred

FOO

assembly

to

for

is

assembled.

from

transportation

vibration

and

impact
during
FOO.
a

disk,

(a)

The
After
and

(b)

When
projection
sheet

(2) Be

(3)

careful

Since

transportation.
to

package

transportation,

The

protection

is

installed

insertion

closing

fix

the

lever.

ejecting

of

for

another

not

to

the

FOD

is

several

sheet,.

to

of

the

the

front

the

protection

the

sheet
transportation.

expose

small

To

protect

FODs

be

sure

which

all

the

protection

lever,

with

the

FDD

and

light,

the

in

one

to

attach

is

FOOs

sheet

pull

sheet,

your

to

it

FOD

box.

the
made
at

of

the

is

up

the

open

finger.

excessive

might

from

such

protection

thick

shipment

done

like

projection

the

lever

Store

moisture.

fall

or

abuse,

sheet

paper

from

a

disk

of

depressing

the

removed

be

thrown

it

is

to

the

shaped

the

like

factory.

installation.

the

sheet

the

protection

down

recommended

during

(4)

When

should
transportation.
to

absorb

the

be

FOD

enough

impact

is

shipped

strong

Also

so

that

assembled
to

withstand

the

packaging

the

FOD

will

- 213 -

in a system,

vibration

of

the

system

not

suffer

the

and

system
impact

should

from

cabinet
during

be

constructed

excessive

impact.

2-2.

INSTRUCTIONS

FOR

INSTALLATION

2-2-1.

(1)

(2)

Refer

your

system

Precautions

Keep

For

the

excessive

It

is

(natural
heat.
When a

th~

adhered

to

the

following

so

the

FDD
example,
operation

dust.

recommended

air

fan

is

air.

to

If

the

that

for

away
install

ability

cooling

attached

the

FDD.

items

theFDD

Installation

from

dust.

the

of

to

operate

should

in

FDD

is

for

can

FDD
the

the

blown

installing

exhibit

away
FDD.

the

not

system
strongly,

from

Such

FDD

be

obstructed)

and

the

expected

the

floor,

care

in a weIl

cabinet,

a

large

assembling

performance.

without

will

protect

ventilated
to

dissipate

install

quantity

it

of

the

disturbing
the

FDD

situation

the

to

draw

of

dust

FDD

into

from

radiated

out
may

be

(3)

(4)

(5)

(6)

(7)

Da

not
magnetic
up

such

position.

00

not
stove.

Da

not

Da

not

The

screws

surface

place

noise

noises

See

expose

place

place

more

the

the

the

for

FDD
source.
which

item

the

FDD

FDD

installing

than

2-2-4.

FOD

Smm.

near

may

to

in

in

a

strong

The

magnetic

cause

sunlight.

an

environment

a

situation

the

errors.

FDD

magnetic

head

Keep

with

subject

should

Be

the

not

noise

and

careful

FDD

corrosive

to

protrudc

read

strong

source

amplifier
about

away

or a electro-

the

from

heater

air.

vibration.

from

the

will

pick

installing

or

FDD

-

214

-

(8)

Da

not

apply

excessive

force

when

installing

the

FDD

in a system

cabinet.

of

(9)

For

(lO)

For
FDD
The
at

(11)

After
it
Protruding
seek

(12)

Fundamental1y,
indicator

the

magnetic

the

connection

the

setting

PCBA,

setting

shipment.

checking

is

bent

operation,

Frame

refer

and

of
head.

of
to

to

match

Confirm

that
extraordinary,
cable

the

the

may

which

front

the

of

the
item

your

the

be

FOD

FDD

the

straps

2-2-3.

these

head

caught

cause

shou1d

lever

may

be

cables,

(short

system

settings

attach

misalignment

cable

by

be
up

might

the

installed

(magnetic

distorted

refer

bars)

be

before

of

the

FDD

other

which

to

item

and

different

operation.

FDD

to

the

parts

of

the

horizontal1y
head

2-2-2.

the

does

system

or

increases

head

up),

causes

terminator

from

not

protrude

cabinet.

or

seek

with

or

vertica11y

misalignment

on

the

the

setting

nor

load

at

errors.

the

that

head

with

the

left

FDD

should
for a 96tpi
Da

not
orientation
of a disk).
between
head.
As

to

tion
angle
consideration

install

the

the

of

the

against

side

not

FOO

or

These

magnetic

other

right

down

and

the

form a greater

against

the

FDD

the

front

orientation

orientations

side

the

horizontal

is

required.

the

with

head

down

front

horizontal
the

bezel

and

with

angle

magnetic
up
of

the

than

plane

lever

than

in

vertical

the

FDD

disk

explained

the

indicator

than

up.

plane

or

In

30°

head

may
may

above

explained

either

for a 48tpi

with

the

down
orientatiop
disturb

cause

up

in

(such
or
above),

misalignment

forming a greater

orientation,

FOO

and

front

horizontal

the

(top

stable

as

the

separate

bezel

the

15°

up.

loading

contact
of

orienta-

the

- 215 -

2-2-2.

Connector

The

basical

the

daisy

and

Cable

electric

chaining

Connection

interface

method

through

between

the

the

signal

FDD

and a host

connector

(Jl)

system

and

is

the

N

+1

'"

power
Fig.205
Refer
FD-55

connector

to

Specification

iT/-~~

:t

__

~+

!c:jH"

I

.....

.

....

,....

(J2).

shows

Fig.206

the

45

location

as

Power

q

44+

l

1

r

------·1

__

..:

J

~I::~·

,.

-

=1'

of

each

to

the

cable

as

to

the

external

connector

~r'

12±1.5

;-

~~--.

connector.

connection.

dimension

connector

Frame

~

__

~IC

Terminator

.

Straps

(Short

Also

(card

ground

socket

bars)

refer

of

J3

to

the

FDD.

edge)
terminal

Fig.lOl

.l4±O.5

in

Bottom

side

I

....

Frame
grounding
parts

(Cl,RlO,

M3

screw)

-

--

----

-

--

--

----

--

-----

---

-------

-

-----..}

(Fig.20S)

Interface

-

connector

216

-

(Units

positions

:mm)

2-2-2-1.

(I)

Signal

Connector

A

0.1

inch

connector

pitch,

and

34-pin

cable

(17

pins,

double

row)

card

edge

connector

is

used

for

the
Specification
The

(at
The
used

even
the

odd

bottom

numbered

as

the

numbered

Specification).
Se1ect
ability

a

suitab1e

into

Manufacturers

Connection

signal

as

connector

to

the

pins

side

of

pins

signal

ground

Table

one,

consideration.

method

Housing

Contactor

detailed

of

the

are

201
taking

(Jl).

Jl

are

FOD)

10cated

(OV)

shows

the

Crimping

3463-0001

not

card

10cated

and

on

lines.

examples

type

3M

used

Refer

are

the

edge

used

(See

of

to

Fig.103

dimension

on

the

as

dip

side

Table

of

recommended

the

cab1e

Crimping

583717-5

1-583616-1

parts

the

of
102

in

of

side

signal

the

in

used

AMP

FO-55

the

FDO

of

the

terminals.

PCBA

and
FD-55
connectors.
and

the

Soldering

583717-5

583854-3

PCBA.

PCBA

are

handling

Maker

P/N

(Table

Po1arizing

Locking

Crimping

Extraction

Matched

201)

Cable

key

cab1e

too1

too1

side

k~y

matched

3439-0000

not

Press:
Locater

P1aten:

F1at

3M

P/N:3365/34

-

used

3440-A

plate:

3443-11

3442-3

unab1e

cab1e

(AWG

connectors

217

-

28)

583274-1

530213-1

90268-1

(Hand

91073-1

for

too1)

Twisted

(AWG

signal

583274-1

530213-1

91073-1

pair

28

'"

interface

not

2 4 )

used

cab1e

(2)

Polarizing

A

the

polarizing

PCBA

card

key

key

slot

edge.

is

The

fitted

between

polarizing

key

pins

No.4

protects

(3)

the

and

No.6

connector

eS)

fram

on

(3)

wrong
No.2
key
As

to

in

far

driver

not

be

turned

data

on a track

Locking

When

pin

For

the

i5

you
two
numbers

used

fixing

Fig.103

connection

the

position

the

cable

as

the

open

of

the
damaged
on.

However,

key

use

two

positions

33

for

the

the

(FD-SS

(connection

of

side

connector.

collector

host

even

system

if

the

if a disk

will

be

locking

for

locking

and

34)

cannot

READY

locking

signal.

keys,

Specification)

of

No.33).

type

side

connector

erased.

keys

~2

pin

(FDD

is

(AMP

key

be

holes

are

No.l

It

is

driver

controller

is

installed

P/N

insertion

used

for

above

used.

to

the

position

recommended

is

used

for

side),

inserted

530213-1)

signal

in

(pin

the

wrongly

this

with
numbers
and

pins

of

No.34

to

use a polarizing

the

interface

the

circuit

and

power

condition,

AMP

P/N

land

OV

lines.

No.2

and

and

will

is

recorded

583717-5,

2,

and

Pin

No.34

No.34

in

(4)

Cable

The maximum

of

For

an
of
a

multiple
reflection
of

Therefore,

length

transferred

the

simple
interface
the

cable,

the

cable

cable

length

waveform

model

receiver

considerably
connection
of

the

output

is

greater

the

maximum

is

which

which

easily

is

has

caused

an

interface

influenced

having a terminator

10ng

cable

of

FDDs

siqnals

since

cable

such

fram

one

length

as

end

allowed

- 218 -

by

can

daisy

the

of

the

by

disorder

mismatching

driver
resistor
be

used..

chaining

FDD

connected

cable

is

shorter

or

of

the

at a cable
at

the

another

Contrarily,

in

Fig.206,

on

the

is

open

condition.

than

distortion

impedance.

end

and
end

for

the

halfway

the

above

explained

simple

model.

In

the

case

of

LI < L2,

shown

in

Fig.206,

the

allowable

Enough

For
at
and

receivers
the
Therefore,

for
Though
of
chain

(Refer

Terminator
Terminator

care

the

system

host

host

and

determine

total

the

system

the

side

connection

to

cable

is

FDD

of

both

cable

it

length

receiver,

item

resistor
resistor

length

required

design,

sides

the

length,

is

construction.

2-2-3-1).

carefully

maximum

sides

recommended

is

different

is

as

3300

lKn

is

remarkably

for

such a case.

observe

cable

to

receive

the

better

the

maximum

follows:

the

input/output

assuming

length

the

for

to

select

depending

cable

3m,Max.

1.5m,Max.

shortened.

the

which

signals
the

system

the

appropriate

on

types

length

signal

cable

enables

connections

correctly.

performance.

of

in a typical

waveforms

the

interface

length

cable

The

and

daisy

both

possible,

shorter

of

cable

types

oe

+12V,+5V L2

control

Note:Omark

power

FDD
unit

in

the

(Fig.206)

Power

~--~~------~~---------+----~~----~----------~~

Signal

FDD

Typical

cable

shows

connecting

the

FDD

address

- 219 -

cable

scheme

Fundamentally,
FDD

has a resistor

terminator.

designated

for

up

to 4 FDDs

by

only

straps

the

final

network

DSO ~ OS3.

for

(5)

Connecting

Be

sure

to

and

disconnecting

turn

the

power

off

the

first.

connector

When

you

plug-in

the

connector,

check

the
excessive
by

pulling

1

and

34)

orientation

force.

the

cable,

of

the

cable

If

of

you

since

are

the

connector

use a flat

the

outermost

easily

cable,

broken

and

by

plug-in
never

lines

excessive

straightly

disconnect

(corresponds

force).

without

the

to

connector
pin

Nos.

-

220

-

2-2-2-2.

(1)

Power

Connector

A

nylon

connector

housing,

and

'4-pin

cable

connector

is

used

as

the

power

connector

(J2).
Table
This

202

connector
construction.
Be

sure

to

connector.

Connection

Maker

P/N

shows

an

prevents

turn

the

Manufacturer

Housing

Contactor

Crimping

Extraction

examp1e

power

method

wrong

tool

tool

of

recommended
connection

off

before

or

connecting

1-480424-0

170148-1

60617-1

90123-2

1-305183-2

connector

because

AMP

Crimping

for

of

the

or

disconnecting

60619-1

90124-2

1-305183-2

the

cable

housing

side.

the

(2)

(Table

Cable

Determine
at

J2

connector

and

(2)

cab1e

and

Matched

202)

the

in

FD-55

the

cable

Cable

thickness

will

Specification,

maximum

side

be

matched

and

in

power

AWG

connector

the

1ength

the

specified

taking

consumption

-

221

24

-

""

18

of

tolerance

the

of

for

the

volcage
the

AWG

power

cable

FDD

20

""

interface

so
range
drop
into

14

that

the

in

item
through
consideration.

voltage

1-4

the

(1)

Use

(see

the

Table

correct

202).

contactor

and

crimping

tool

to

suit

the

cable

thickness

- 222 -

2-2-2-3.

Frame

As

described

to

the

grounding

in

frame

of

item
the

1-10

FOO

of

FO-55

through

Specification,

Cl

(O.OlpF,

500V)

oe

and

OV

RIO

is

connected

(lOOKO)

in

parallel

at
Fig.205.
connectors
the

M3

screw

oe OV-Frame

acceptance
system).
applications
methods

Another

(1)

When

(2) When

(For

However,

in

frame

the

the

example,

shipping.

Cl

and

are

located,

for

connection

inspection

from

item

(A)

grounding

FOO

FOD

RIO

are

frame

purpos~

this

items

~

is

assembled

is

installed

installed

Refer

mounted

and

they

grounding

by

O.Ol~F//

connection

(1)

to

(C)

is

is

required:

on

to

Fig.109

on

the

are

connected

(see

100Kn

for

FOO

is

(3).

Secure

required.

in a system

or

placed

the

vibration

in

FO-55

PCBA

on

Fig.205).

is

sufficient

unit

only

insufficient

connection

cabinet.

on a metallic

tester,

Specification

which

to

the

interface
frame

for

(not

assembled

for

plate

placed

the

by

and

through

shipping

in

the

following

one

of

the

during

on a metallic

or

tests.

plane

(3)

Ouring

Another

(A)

Connect
cabinet
Specification).

to

(B)

Utilizing
side

in

electro-static

frame

the

with

oe

OV

of

the

thermostatic

grounding

FOO

frame

the

installation
It

of

the

power

the

frame

FOO,

connect

oven)

noise

method:

securely

is

required

supply

ground

the

- 223 -

test.

to

taps

for

unit

terminal

frame

the

(refer

the

by

an

(faston

ground

metallic

to
system
appropriate

securely

cabinet

Fig.10l

cabinet

terminal)

(system

in

tQ

methode

at

to

OC

FO-55

be

the
OV

of

connected

rear

the

(C)

power

AWG

14).

Connect

to

oe

supply

the

OV

through

unit

test

through

plane

a

low

a

low

or

test

impedance

impedance

equipment

cable.

cable

used

Otherwise,

for

(thicker

testing

insert

than

the

a

FDD

thick

If

any

(Cl,

If

it

off

one

If

oe

from
the
result,

insulation

vibration

of

RIO,

is

unavoidable

Cl

and

and

execute

OV

electro-magnetic

static

expected

the

M3

screw)

RIO

and

the

electricity

tester).

above

plate

with

one

frame

reliability

between

methods

in

the

to

remove

a

cutting

of

either

are

inductive

generated

the

FDD

is

executed,

FDD

may

these

plier

(A)

completely

noises

by

will

still

or

not

and

parts

or

(B)

the

the

the
be

replace

method.

open,

and

moving

be

obtained.

test

frame

mounted.

for

system

.

the

the

there

parts

plane

grounäing

M3

FDD

is

(unsuitable

construction,
screw

is

easily

no

way

in

the

parts

with

suffered

to

discharge

FDD.

a

plastic

And

for

cut

in

-

2~4

-

2-2-3.

Setting

The

FDD

of

Straps

is

equipped

and

with

Terminator

16

straps

and a terminator

resistor

network.
Users
Be

set
1-11

The
double

Refer

(4 FDDs,Max.)

sure

for

and

short

can

to

your

row

to

select

check

1-12

bars

pins

Fig.206

an
that

system

in

FD-55

and

and

as

appropriate

the

be

fore

Specification.

the

terminator

IC

socket

to

the

setting

short

bars

operation

J3

connection

resistor

on

the

for

and

the

according

network

bot

tom

of

several

their

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FDDs

systems.

this

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are

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mounted

by

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correctly
or

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on

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chaining

- 225 -

2-2-3-1.

(I)

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FDD

side

and

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shipment

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a

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Input

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bottom
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DRIVE

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DRIVE

input

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SELECT

SELECT 2
SELECT 3

signals

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0
1

input

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1

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of

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OSI

OS2
OS3

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h3 L

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input
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socket

-

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Fixed

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GI

~2

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are
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Table
each

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(Fig.207)

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relatively

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types

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low

-

connection

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termination

resistor

current

226

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in

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(3300

values

longer

consumption

and

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LQW

and

and

level

length

low

lKO

current

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that

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of

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FD-55(L)

lKSl

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Resistor

value

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line

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signal

(LOW

Interface

SELECT
current
level)

input

level)

driver

Notes:

current

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Resistor

2.

TTL

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Other
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Internal
Total
Terminator

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Type

Sink

74LS38

the

interface

SELECT
input

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current

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or

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(Rl3)

signal(RAl)

current(il)

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current(i3)

circuit

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driver.

203)

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of

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,

I

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48mA(0.4V}

line

an

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3300

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1.6mA 1.6mA
l6.4mA
l4.8mA

0.4mA

7438

current
of

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I

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type

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24mA(0.5V}

typical
termination

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11m

10.4mA

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4.9mA

0.4mA

74LS38

7438

values.

or

as

(2)

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For a multiple
network
resistor
However,
in

sink
FDDs.
network

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It

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other

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are

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in

as

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side

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satisry

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>

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expression

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+

internal

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than
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WRITE
received

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DATA

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cannot

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FOD

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LOAD

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228

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beeomes

spindIe

(B)

lOsee,

this

this

strap

FDD

strap

internal

the

rotation

the

the

motor

approx.

internal

is

disk

proteeted

front

ready

is

off-state,

is

on-state,

eireuit

inserted

is

removed.

will

lever

is

not

after

eireuit

is

state

input,

the

will

into

disk

stop

elosed,

automatie

will

automatie

be

(Note

is

in

(as

far
the

removal

not

be

exeeuted

the

front
that

removed~

either

disk
as

an

READY

of a disk

rotation
exeeuted.

rotation

in

bezel.

automatie

of

the

starts

external
signal

of

of

either

following

rotation,

eommand

maintains

from

the

the

of

rotation

the

FDD.

spindie

spindle
the

following

will

two

and

to

FALSEl

motor

motor

not

eonditions.

the

FDD

rotate

by

two

start

the

235

-

-

(6)

Or

in

and

the

Summary

a

of

rare
front

strap

ease,

lever

seleetion

when a disk

is

not

elosed

is

inserted
for

losee,

at

approx.

the

index

hole

position

Table

204

Front

turn-on
Spindle

rotation
Head

operating

FDD

address

designation
Automatie

reealibration

shows

Items

bezel

eondition

motor

load

the

indicatorl

eondition

solenoid
eondition

(Table

proeedure

I

I

204)

Table

of

the

Related

With

load

head

solenoid

IU,UO,Ul,UR

ML,PM

HL,SM,HS,HM

OSO

tU OS3,

RE

(G

model)

of

strap

strap

MX

seleetion

seleetion.

straps

CSS

model

IU,UO,Ul,UR

ML,PM

OSO

tU OS3,

RE

(G

model)

Items

to

be

referred

2-2-3-3

2-2-3-3

2-2-3-4

-

MX

2-2-3-5

2-2-3-2

(31-

Ca)

,

(b)

2-2-3-2

(4)-(e)

-

236

-

2-2-3-3.

Turn-on

conditions

of

front

bezel

indicator

Table
Six

combinations

Selection

No.

1

2
3

4

5

6

Notes:

205

1.

2.

3.

shows

Strap

IU

-

-

ON
ON
ON
ON

li_ti

Any
be

Never

the

turn-on

can

be

combinatio~

UO

Ul

-

-

ON
ON ON

-

-

-

- - -

ON

-

mark
other

used

indicates

combinations

practically.

set

UO

selected

'UR

-

ON

-

-

-

and

condition

by

Indicator

DRIVE

DRIVE
IN

IN
DRIVE
DRIVE

the

UR

straps

of

four

SELEC'r

SELECT

USE

USE

SELECT
SELECT

off-state
of

straps

on

the
straps

latch

at

front

turn-on

x

+
+

of
than

the

of

conditions

Ready

IN

USE
USE"'

IN

the

the

same

bezel

IU,

latch

strap.

above

time.

indicator.

UO,

will

Ul

and

UR.

not

(1)

(2)

(3)

(Table

Selection

is

the

indicator

the

inserted,

When
the

Selection

When
ready

Refer

Selection

205)

1

DRIVE SELECT

turns

2

condition

state,

to

item

3

the
front

1-8-3

Front

input

on.

of

selection

indicator

lever

(13)

be~el

signal

turns

closed,

in

FD-55

indicator

1

is

on.
and

Specification

turn-on

selected

satisfied

Ready

the

disk

conditions

by

DSO ~ 3

and

state

rotates

means

for

also

normally.

details.

~traps

the
that

is

FDD

a

TRUE,

is

disk

in

-

237

-

When

the

IN

USE

signal

(signal

connector

pin

No.4)

is

TRUE,

the

indicator

(4)

(a)

(b)

turns

Selection

When

the

The

DSO ~ 3

(signal

The
by

DSO ~ 3

IN

USE

on.

IN

IN

4

IN

USE

USE

flip-flop
straps
connector

USE

flip-flop

straps

flip-flop

becomes

pin

becomes

~

t-...J

in

the

FDD

is

set,

is

set

when

TRUE

No.4)

is

during

reset

TRUE

;----------------.

__________________

when

during

the

DRIVE SELECT

TRUE-state

the

FALSE-state

the

indicator

signal

of

the

DRIVE SELECT

of

J

IN

signal

the

turns

selected

aSE

selected

IN

USE

on.

by

signal

signal.

(5)

(6)

DRIVE SELECT

IN

USE

flip-fl

Selection

The

indicator

Selection

5

6

op

(Fig.209)

turns

C

Set

on

IN

in

Indicator

Indicator

500ns,Min.

USE

signal

either

turns

turns

of

1

on(Selection

on

latch

the

conditions

{Selection

500ns,Min.

(Selections

4)

6)

of

Selections

4

Reset

and

1

I

i

I

6>-

I

j

I

I

.

land

3.

-

238

-

The

indicator

turns

on

in

either

of

the

conditions

of

Selections

1

and

4.

Note:

The

FDDs

factory.

are

set

to

the

condition

of

Selection

5

at

shipping

from

the

-

239

-

2-2-3-4.

Rotating

eonditions

of

spindie

motor

(I)

Table

seleetions

Seleetions

Seleetion

The

206

7

8

9

10

(Table

spindie

shows

I

I

I

206)

7

are

Straps

ML

-

-

ON
ON

Basie

motor

the

rotating

available

PM

-

ON

-

ON

seleetion

rotates

Spindie

MOTOR

I

MOTOR
MOTOR
MOTOR

+

eondition

by

the

ON
ON
ON
ON

On-state

of

when

ML

motor

Automatie

+
+

On-state
Automatie

+

of

spindie

the

of

and

PM

rotating

front

MOTOR

the
straps.

of

bezel

motor

ON

spindie

eonditions

rotation

front

rotation

rotating

input

motor.

at

bezel

at

indieator

signal

disk

insertion

indieator

disk

eonditions

is

insertion

TRUE.

Four

basie

(2)

Seleetion

The

when a disk

Refer
rotation

(3)

Seleetion

The

the

205
eannot
eombinations

spindie

to

spindle
front
is

satisfied).
be

8

motor

item

by

9

bezel

applied

is

inserted

2-2-3-1

the

motor

of

rotates

internal

rotates

indieator

However,

for

the

rotating

when

(automatie

(5)

"PM

eireuit.

when

turns

this

the

strap"

the

on

the

purpose.

eonditions

MOTOR

rotation

MOTOR

(when a turn-on

Seleetion

ON

as

to

ON

Following

by

Seleetion

input

by

the

input

2

of

signal

the

details

signal

the

shows

FOD

internal

6f

eondition

turn-on

all

9.

is

TRUE,

the

is

TRUE,

eonditions

the

or

eircuit).

automatie

or

in

Table

possible

when

-

240

-

Seleetion

9-1:

MOTOR

ON

+ DRIVE SELECT

(4)

Notes:

Seleetion
Seleetion
Seleetion
Seleetion

Refer
indieator.

Seleetion

The

(9-1
rotation
Refer
rotation

to

spindIe

through

to

1.

The

9-2:
9-3:
9-4:
9-5:

item

10

by

item

by

FDDs

MOTOR
MOTOR
MOTOR
MOTOR

2-2-3-3

motor

9-5)

the

2-2-3-1

the

rotates
is

FDD

internal

internal

are

set

ON + IN
ON + IN
ON
ON

as

satisfied

(5)

USE
USE

1ateh

+ DRIVE SELECT +

+ DRIVE SELECT +

to

the

details

when

cireuit.

to

"PM

the

any
or

circuit).

strap"

condition

IN
IN

of

one

of

the

when a disk

as

to

of

USE
USE

1ateh

the

turn-on

conditions
is

the

details

Se1eetion

inserted

eonditions

in

(automatie

of

the

8

at

shipping

of

Se1eetion

automatie

the

9

from

the

2.

Elongation
uti1izing

(4)-(d)

eondition

factory.

"ML

in

the

strapfl).

for

life
Se1eetion

your

and

app1ieation.

saving

9

Se1ect

or

in

power

Seleetion

the

most

consumption
10

(refer

appropriate

ean

to

item

rotating

be

2-2-3-2

done

by

-

241

-

2-2-3-5.

Operating

conditions

of

head

load

solenoid

This

not
Table
Three
HS,

Selection

Notes:

item

applies

and

No.

1

2

3

applies

207

shows

head

HM.

Strap

ON

1.

li_li

2.

Any

practically.

3.

Never

to

load

HL

-

-

mark
other

the

ON
ON ON

set

only

the
conditions

combinations
SM

for

CSS

models

operating

HS

-

-

-

indicates

strap

HS

and

combinations

the

can

HM

ON

-

-

the

HM

models

(without

condition

be

selected

Head

Ready

DRIVE

(DRIVE

off-state

straps

with

than

on

the

head

load

at

load

of

the

by

four

conditions

+

pre-ready

SELECT x tReady

SELECT

of

the

the

the

same

head

load

solenoid)

head

above

load

straps

MX)x(~eady

+

x HEAD LOAD

strap.

will

time.

solenoid

.

solenoid.

of

HL,

+

Pre-ready)

+

not

and

SM,

Pre-ready)

be

used

(1)

Selection

When

command
turn-on
Ready
lever

(2)

Selection

When

~ignal

the

FDD
of
command),

state
closed,

the

condition

selected

11

the

12

tTable

is

in

spindle

(or

pre-ready

and

by

207}

ready

motor

the

head

the

disk

of

Selection

DSO ~ 3.

Head

or

loading

state)

rotates

straps

load

conditions

pre-ready

<-MOTOR

means

11

is

-

242

state

ON

signal

will

be

that a disk

normally.

is

satisfied

TRUE,

-

by

an

or

front

executed.

and

the

head

external

bezel

is

inserted,

when

loading

rotation

the

is

indicator

front

DRIVE

SELECT

executed.

(3)

Selection

13

When

is

when

loading

Notes:

on

1.

2.

the

condition

or

the

the

HEAD

is

The

from

The

has

model

time,

The

635msec

DRIVE

LOAD

executed.

FDDs

the

are

factory.
condition
no

head

for

this

and

no

time

required

for

in

Selection
SELECT
signal

set

to

of

Selection

load

solenoid.

purpose

head

the

Selection

signal

(signal

the

load

be

fore

11

is

selected

connector

condition

11

It

because

impact.

enabling

11

satisfied,

is

similar
is
of

and

400msec

by

pin

of

Selection

rather
fewer

the

and

DSO ~ 3

No.41

to

the

better

parts,

read/write

for

the

when

straps

is

TRUE,

12

at

CSS

to

shorter

operations
CSS

the

MX

is

shipping

model

use

the
access

model.

strap

TRUE,and

the

head

which

CSS

is

- 243 -

2-2-4.

Inductive

Noise

in

Installed

Environment

Since

the
consideration
Equipment
switching
cases
noise

the

cables

on

read

separator.

A

single
inductive
as

motors,

the

magnetic

the

external

such

by

cases,

system

as a CRT

additional

FOO

handles
is

installed

regulator,

may

the

read

waveform

FOO

or

or

magnetic

solenoid,

head.
noise,

flyback

cabinet,

minute

required

to

around

parts

such

have a harmful

output
or

combined

from a disk

in

peak

FODs

noise

and

PCBA

Even

it

~~ough

is

not

transformer,

shielding

or

consideration

signals
reduce

the

FOO

as
effect

shifts

are

generated

by

these

perfect

against

in

inductive

such

transformers,

on

and

decreasing

protected

by

shielding

shielding
for

switching

external
for

data

reproducing,

noise

as

a CRT

the

FOD.

deterioration

window

in

all

internal

these

relatively

regulator,
noise

the

installation

and
display,
or

motors

This

conditions

parts

parts

is

also

sources,

switching

in

margin

of

and

effective

large

etc.

sufficient

TV

set,

and

appears

symmetry

of

from

the

by

shielding

noise

In

shielding

position

in

as

the

FOO

sources

some

noise.
or
some

of

data

such

against

may

(l)

(2)

be

required.

a

noisy

Refer

to
Especially,
of

system
regulator,
a

CRT

display.

Observing

Lengthen

sources.

Install
and

250KHz

The

environment

the

examples

it

is

design

or

if

method

the

interface

a

disk

for

and
FO-55G)

following

on

for

required

if

the

the

system

A

for

write

shows

the

FOD.

your

to

FOD

is
in

influence

cable

LF

data

on

all

ex&~ples

improvement

confirm

installed

which

by

of

the

(125KHz

over

-

the

244

the

the

external

FDD

to

innermost

-

to

of

noise
near
FDD

make

of

observe

environmental

influence

a

CRT

is

assembled

noise

sources

apart

WRITE

DATA

track.

the

display

from

for

influence

conditions.

at

the

time

or a switching

is

placed

the

noise

FD-55A ~ F,

of

near

l31

Observe

the

READ

DATA

output

signal

in

read

operation

with

an
oscilloscope.
oscilloscope

scale
adj
jitter

measure

(Larger

(Fig.2l0)

(4)

Shorten

so

by

variable

ustment , find

width

the

READ

REAO

external

the

to

jitter

DATA

DATA

Influence

interface

For

that

the

this

knob

the

triggering

width.

Trigger

to

observation,

two

pulses

so

that

variable

the

cable

knob

READ

length

can

three

pulse

OATA

set

the

time

be

observed

pulses

position

can

be

and

can

be

at

which

observed

scale

observed.

then

the

most

of

reduce

next

clearly

the

the

In

pulse

time

this

to

U

--~"~---Jitter

"1

1111

--~·~·~---Jitter

11

1

waveform

as

it

was

by

and

external

install

width

width

the

(3)

(5)

noises

FDD

in

the

(5)

(6)

Notes:

specified

As

in

same

time

If

the

jitter

It

is

as

possible.

1.

2.

position

item

recommended

(2),

scale

jitter

indicates

For a double
By

width

figures.
influence

are

this

used.

width

method,

is

in

write

as

in

increases

the

influence

to

arrange

sided

allowable

However,
without

the

new

item

it

system.

1F

data

(3).

when

not

FOO,

is

rather

or

to

this

breaking

of

to

both

know

is

and

measure

compared

external

increase·

sides

difficult

the

an

easy

down

the

the

with

noises.

the

0

and 1 should

to

noise

method

influence

system,

jitter

item

jitter

judge

to

know

provided

width

(3),

width

be

how

correctly

the

the

as

tested.

much

noise

that

with

the

increased

much

jitter

in

two

FDDs

-

245

-

Observing

(1)

Install

method

the

FDD

in

B

tor

the

influence

system

by

external

properly.

noise

sources

(2)

(3)

(4)

Connect
and

TPG

Refer

of

the

Set

one

them

to
Connect
mode.

Install

Write

on

all

If

it

of

the

leading
of

to

item

test

of

be
the

a

2F

data

over

is

difficult

track)

wires

the

bottom

3-3

points.

the

two

able

to

oscilloscope

disk

and

(250KHz

the

track.

may

(shielded

side

of

FD-55

channels
observe

set

~~e

of

to

write

be

done

wires

PCBA

to

Maintenance

of

the

them

ground

head

WRITE

by

as
to

to

DATA

2F

data,

a command

are

recommended)

the

two

channels

Manual

oscilloscope
one

waveform.

TPG.

the

Also

innermost

for

FD-55A ~ F,

a

disk

from

of

for

the

to

Invert

set

both

track.

500KHz

initialization

host

system.

from
an

oscilloscope.

detailed

mode

channels

for

(formatting

TP9,

position

TPlO,

and

ADD

to

AC

FD-55G)

(S)

(6)

(7)

(8)

Measure

For

the

on

the

Remove

Calculate

Noise

2F

If

level

read

the
26dB),
is

between

the

read

initialized

innermost

the

disk

the

S/N

in

level

value

the

in

calculated

FDD

5%

and

output

track

and

ratio

item

item

is

protected

level

disk,

(corresponds

measure

according

(6)

(5)

by

measure

the

x

100

the

against

lO%(S/N: 20 ~ 26dB) I

-

(p-p

noise

(\1

above

246"-

valuel

the

.read

to

level

to

the

expression

the

after

level

2F).

following

external

there

(p-p

will

the

above

of

higher

value)

expression.

is

less

noises.

oe

no

writing.

output

.

than

If

problem

5%

the

portion

(S!N:

value

in

practical

operation.
recommended.
If

the

value

is

more

However,

than

10%

as

(S/N:

much

20dB

improvement

or

less),

as

some

possible

improvement

is

in

shielding
will

Notes:

or

not

be

1.

For a double

2.

For a 96tpi
that
disk
required
It

is

than

3.

Recommended
in

data

PLO

circuit

becomes

reducing

obtained.

sided

FOO,
of a 48tpi
and

head
to

pay

recommended

5%

t26dB)

S/N

separator

is

insufficient.

noises

FOO,

the

read

FOO.

Also

positioning

enough

to

design

ratio

in

operates

used

in

shall

both

care

the

be

sides

output

taking

of

an
for
your

item

correctly
host

required

0

voltage

a

FOO

the

system

(8)

is

system

since

and I should

is

approximately
off-track
into
S/N

consideration,

ratio

with

applieä
and

sufficiently.

side,

the

only

the

desired

be

reliability

tested.

half

between a recorded

it

is

of a 96tpi

target

when

FDD.

of

PLO

less

circuit

If a poor

above

S/N

ratio

as

- 247 -

2-2-5.

Front

Bezel

Fig.211

(front

Notes:

1.

When
drawings

for

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the

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correct

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out

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96tpi

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96

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the

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seeking

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signal

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distance

stopper)

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first

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It

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therefore,

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RE

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immediately

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on,

and

- 250 -

valid

the

the

the

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to

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input

for
pulse.
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the

(13»

first

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check

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at

Start

the

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input

signal

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turn-on

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Installed
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can

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be

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READY

disk

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For a CSS

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seek

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the

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model,

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with

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motor

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signal

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since

life

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when

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to

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ML

is

settled
start
timing

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of

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longer

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load

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to

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TRUE

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only

is

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than

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lOsec).

solenoid,

paused

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to

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always

head.

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to

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on-state).

stable

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data

CSS

model

within

800msec

the

data

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in

loaded

However,

actuating

to

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FDD

it

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recommended

more

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rotation
read

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disk

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since

time

paused

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write

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of

(program)

for

more

to

item

400msec

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load

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the

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than

stop

time.

2-2-3-4.

solenoid.

head

is

time

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the

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This

of

(3)

is

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a

slight

Disk
and

of

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Far

life

motor

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be

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pressure

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rotating

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motor.

with

from

the

even

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35msec

--

...

::::=

side 0 head

though

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on

one

is

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in

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usually

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closed.

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400msec

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contactwith

condition.

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to

167

as

far
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after

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approx.

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disk

with

is

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can

- 251 -

trefer

to

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2-2-3-5).

In

order

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is

(4)

necessary
will

not

spindle

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detected
load

operation

The

operation

the

CSS

models

For

the
above,
does

rot

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seek

that

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60Omsec,

model

for

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pay

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the

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purpose

load

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index

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care

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after

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only.

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at

the

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strap

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on a track

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straps

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(635msec

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it

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impact

speed.

command

on,

the

spindle

is

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strap

by

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is

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do

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the

than

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than
should
96tpi

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access
and

l8msec

and

data

Ouring

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signal
and

590~sec

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the

head

6msec

be

FDDs

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the

FALSE

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input

for

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WRITE

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seek

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to

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change

and
96tpi
or

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GATE

input

FD-55G.

the
the

the

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aspace

settling

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operation

keep

signal

the

cannot

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desired

STEP

and

of

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3msec

of

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than

direction

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GATE

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error

DIRECTION SELECT

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successive

be

96tpi

2lmsec

(settling

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edge

input

FDDs,

with

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time

21msec

of

performed.

at

signal

do

least

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make

lmsec

by 4 through

might

have

occurred.

48tpi

the

the

8

signals,

movement
aspace

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is

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for

48tpi

last

STEP

DRIVE SELECT

for

FD-55A ~ F

retries

Execute

the

in

of

FDDs

after

more

pulses

for

pulse

the

-

252

-

same
the

recalibrate

desired

track

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again.

as

after

If a desired

power-on

sector

in

order

cannot

be

to

try

found

to

still

set

to

after
error
If
the

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specified

one

approx.

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seek

several

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error

occurs

recalibrate

read

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that

per

109 bits.
in

the

head

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often

repetitious

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tapping

seek

operation

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damage

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times

in
operation

when

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continuous

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adopted.
impacts
noise

into

with

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sided

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the
recoverable
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error

randum

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of

head

consideration,

head

FOO,

load

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series

of

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disk

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and

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rate

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a

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loading

condition.

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is

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of

operation,

data

the

the

drive

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field,

above.

error)

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to

unload

the

ttapping

it

is

sided

that

regard

execute

operate

may

to

one

the

disk

damage

impact),

desirable

FDO.

no

error

it

normally,

occur

error

head

caused
access
to

occurs

as a hard

retry

less

per

before

speed,

perform

by

including

it

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than

24

hrs.,

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by

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4

3xl0
taps
do

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on a track

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by

the

SELECT

the
tion).

period.

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of

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to a single

concentrate

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selection

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ONE

signal

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of

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SIDE

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they

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at

the

signal

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point

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are

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it

signal.

least

WRITE

may

lmsec

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be

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signal.

is

required

for

signal

changed

signal

- 253 -

In

practical

position,

evenly

00

not

and

on

to

designate

change

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to

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at

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time

TRUE

at

least

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the

track.

a

the

level

590usec

Ccompletion

except

lOO~sec

for

are

desired

of
for

of
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after

tappings

allowable

disk

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FD-55G
write

above

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side

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TRACK
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SELECT

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PROTECT

INDEX

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are

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will

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if

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be

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output

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2.

following

you

want

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iod

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period

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them

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input

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signal.

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at

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low

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at

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put

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2

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end

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power

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130UF, Max.

purposes.

+12V

power

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- 256 -

2-4-2.

Internal

Current

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for

Spindie

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use

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disk

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head

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in

not

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loaded
at

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installed

disk

disk

rotation

6)
at

rotation

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installed,

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(Note

4,5)

start

7)

current

4,12)

start

consumption

+12V

Typical

25

45

130

180

700

620

620

(mA)

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40

70

I

350

410

800

750

800

of

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and

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25

t

t

t

t

t

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power

30

t

t

t

t

t

t

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solenoid

PCBA

load

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circuit

Notes

12)

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motor

for

Seek

(Note

Seek

(Note

Energization

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After

(Note

Waiting

(Note

Read

Write

208)

table

operation

8)

stops

8)

9)
starting

9)

10)

operation

operation

Detailed

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start

current

145

-

200

-

15

30

125

consumption

180

-

250

-

30

40

155

for

each

50

85

150

220

220

use

-

-

-

65

-

105

205

300

300

-

257

-

(1)

(2)

The

symbol

"Typical"

li_li

current

indicates

means

that

the

the

power

practical

is

value

not

of

used

the

for

that

average

item.

current
consumption
nominal

(3)

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does

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of

(4)

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(l50g.cm,

Also

the

flexible

(5)

"Rotating,

read

voltage.

not

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peak

when a

"Maximum"

maximum

disk

operations.

measured

current

the

in

the

value.

current

commercially

approx.

current

running

standards

disk

installed,

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means

that

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item

of

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of

the

spindle

with

the
of

torque

such

the

value

at

available

spindle

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spindie

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as

ISO,

head

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average

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disk

axis

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in

room

value

any

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Ass'y

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ECMA,

includes

temperature

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at

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typical

is

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means

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shows

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data

write

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upper

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in

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or

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disk

of

130mm

data

(6)

Fig.214
rotation

(Fig.214)

shows a typical

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......----

Start

~~~......-~~---+--------

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typical

s,Max.

on

waveform

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------Average

time

waveform

-

of

at

of
258

the

rotation

at

Normal

spindie

-

spindle

start

rotation

Ripple

Time

rotation

motor

motor

start

current

~verage

start

current

normal

current

at

at

rotation

The

lasting

time

of

the

start

current

is

40Omsec,

Max.

(The

same

as

the
upper
as

(7)

"Forced
compulsively
not

(8)

To
applied
including
During

period,

+5v
Fig.2l

limit

within

be

the

is

of

the

85'

of

the

stopft

broken

stepping

only

other

during

applied.

shows a typical

means

after

by

at

settling

operation

the

motor
head

data

start

absolute

that

the

rotation

continuous

for

positioning

time)

than

write

waveform

time).

value

the

rotation

executing

in

order
positioning,

or

read

------Peak

And

the

of

the

of
start.
restriction.

the

time

of

to

after

the

(during

decrease

at

ripple

average

the

Motor

head

--

for

the

stop

stepping

seek

current

current.

spindie

servo

seek,

track
the

example,

(JSOmA,Max.)

motor

circuit

+12V

access

temperature

on a desired

motor

is

specified

is

full

per

during

current.

stopped

will

power

iod
rise.

track,

is

waiting

(9)

+12V

current

+5V

current

(Fig.2l5)

To

the
operation
nominal

head

starts

condition

Average

at

seek

JlLl~C~"'L

I I 0

Seek

A

load

I

starts

The

typical

solenoid,
in

order

after

~~~~~~~~~~---75ms,Nom.

lOOms,Max.

last

Seek 0 eration

(+12V

waveform

the

step

applied)

+12V

to

full

decrease

energization

command

of

stepping

power

the

start

Seek

(+5V

applied)

motor

is

applied

temperature

(during

stops

current

only
rise.

head

when

During

load

the

-

259

-

condition),

load

solenoid

At

start

of

+5V

current.

the

is

head

applied.

loading,

Fig.2l6

it

is

shows a typical

required

in

order

waveform

to

assure

of

the

the

head

head

position

applied

to

the

+l2V

+5V

26ms,Nom.,35ms,Max.

current

current

+l2V

against

stepping

applie<i

the

shock

motor

O~-~~--+j--

o

_i--_~J

of

the

solenoid

as

~

weIl

__

as

~~peak

~verage

I

-,r-----Peak

~----

__

~II.

__

item

~

____

at

at

at

I i

I

+5V

aoplied

Head

load

• ' • • i

starts

motion

(ß).

start

start

start

~-----Average

~

that

+l2V

(300mA,Max.)

(245mA,Max.)

is

after

start

I

i

~

Head

unload

I

(lO)

Lll)

e12)

"Waiting"

level)

"Write

TRUE.

For

a CSS

As

far

spindle

(Fi.g.216)

means

.

operation"

model,

as

the

motor

that

means

the
disk
current

A

all

item

is

typfcal

the

the

of

installed,

during

waveform

input

period

"Head

head

-

interface

when

load

head

unload

260

of

the

solenoid"

load

-

head

signals

w""RITE

condition

is

not

load

GATE

is

applied.

solenoid

are

..FALSE

input

not

applied.

continues

current

(HIGH

signal

and

is

the

2-4-3.

Current

Consumption

Timing

Chart

Fig.217
Fig.218

shows
shows

the

the

timing
timing

chart
chart

of

of

the
the

typica1

maximum

average
average

current
current

consumption.
consumption.

-

261

-

35ms,Max.

*60Oms,Max.

40Oms,

+12V

+5V

o

MaX

40

225

0--~--+-------~---+--~~------4+----~--~--~--~-------+-4------

powlr

on

surge

Motor

I

10Oms,Max.

620

1

230

MOts°t"art

on

60

Disk

insertion

Head

-I

530

load

Seek

'I

355

I 1

Seek
start

40Oms,Max.

l,lOOms,MaXo

1

230

H

ad

unload

Wrl.te

225

Jtor

off

Head

Mo

or

load

620

"I

275

Motor

start

on

530

I

Head

command

load

Notes:

1.

The
operation.

Average

2.

~Jpical

consumption
with
typical

3.

*:

condition

4.

Dotted

(Fig.217)

figures

nominal

Head

current

average

one

loading

(refer

line

Typical

show

the

current

measured

voltage.

obtained

is

to

shows

average

typical

lfffiiEIH1

with

Rotation

by a commercially

executed

item

the

case

current

-

~

means

a

1-8-3

of

262

average

typical

after

-

Ripple

practical

torque

the

of

FD-55

CSS

model.

timing

current

current

value

FDD

in
is
available

FDD

Specification)~

chart

(mA)

caused

of

room

supposed

becomes

at

average

temperature

disko

pre-ready

to

each

by

spindle

motor

current

be

a

and

3Oms, Max

lOOms

,Maxoll

.•

I '

i

•

40Oms,Max.

*600ms,Max.

10Oms,Max.

500

315

Head

unload

Write

300

Motor

off

Motor
Head

;-----

Motor

on

load

....

start

Head

command

450

Seele

start

-I

630

I

11

+12V

0--~--~--------~--~---+~-4----~~--~--4---~---4--------~-+~-+---

300

+5V

on

Motor

start

on

1

Power

surge

Motor

3151

110

I

i

1

I

I

I

Disk

insertion

Head

Seek

load

850

--+~

load

Notes:

1.

The

operation.

2.

The

the
some
specification,

3.

Refer

(Fig.218)

figures

actual

"maximum

abnormal

to

Notes

show

average

average"

conditions

or

1,

Maximum

the

value

forced
3,

maximum

of

'\Inder

such
stop

and 4 in

average

-

263

average

current
any

operating
as
of

Fig.217.

current

-

current

consumption

installing
the

spindle

timing

(mA)

does

conditions

a

disk

motor.

chart

at

of

each

not
except

out

exceed

for

of

2-5.

WRITE/REAO

The

FOO

has

METHOO

been

designed

for

excellent

stability

and

easily

handled
recording
Improved

electrical
compatibility
flexible

disk,

Improvements

(LSV,
track
against
bit

ation

ISV) , head
positioning,

inductive

shifts,

of

the

positioning,

and

environmental

dust,

to

t~mperature,

the

reliability

in

both

with

cover

improved

FOD
PLO

FM

(single

and

ISO,

assures

many

magnetic

optimized

noise,

signal-to-noise

controller

(or

VFO)

considerations

humidity,
of

density)

mechanical

ECMA,

a

better

ANSI,

areas,

characteristics,

~Tite/read

el~ination

parameters,

response

vibration

the

system

and

characteristics

and

error

margin.

including

of

ratio

speed,

such

as

as a whole.

MFM

JIS

disk

head-disk
circuitry,
spindle

and

such

optimbm

inductive

and

so

(double

standards

rotational

motor

so

as

the

write

on

also

density)

together

for

contact,

improved

noise,

on.

Careful

data

noise,

contribute

modes.

with

l30mm

speed

the

(5.25

accuracy

improved

shielding

reduction

consider-

separator

window

pre-compensation

po~~r

line

greatly

data

inches)

in

noise,

-

264

-

2-5-1.

Single

FM

method

The

FDO

recording.

The

FM

data

density

Density

is

has

method

generally

been

designed

utilizes

to

flux

used

to

two

frequency

transition

for

use

single

the

density

density

FM

method

components

ratio

recording.

for

single

(lF

is

0.5,

and

2F)

giving

density

and

a

the

redundancy
of
for

Sununary

(1)

Data

(2)

Clock

gaps,

FD-55A ~ F

bit

Bit

cells

WRITE/READ

FDD

Data

window

bit

and

of

(0)

DATA

ratio

ID

FM

is

(C)

2F(4lls)

of

field

and

method

located

is

located

0.5,
(track

50KHz

lt

1

C

without

for

in

the

at

0

(50%

taking
formatting).
FO-55G.

center

the

leading

0

C

c

I

I

tl

6lls

(75%

of

t2

4us

of

data

of

0

C

I

data

cycle)

cycle)

into

consideration

Data

the

bit

edge

of

1

D D C

I

transfer

cello

the

1 1

D C

I I I

I

I •

bit

rate

cello

0

I

I

C D C

I

the

1

I

Bit

lF

necessity

is

125KHz

0

I

cell

(8lls)

C

I

Note:

(Fig.219)

A

PLO

the

FDD

The

above

a

half

of

Bit

circuit

and a fixed

timings

the

correspondance

is

not

(llS)

indicated

necessary

window

can

are

values.

and

when
be

-

265

for

FD-55A

data

only

adopted.

-

window

the

'\..

in

FM

The

F.

FM

method
most

Timings

method

appropriate

is

for

FD-55G

adopted

are

with

window

is

6Us

for

tl

and

4Us

for

t2

in

the

figure

above.

The

t2

width

may

be
wider
window

provided

(towards

that

the

it
left

is

in

widened

the

in

figure

the

above).

trigger

pulse

direction

of

the

-

266

-

2-5-2.

Double

MFM

method
been
M2FM

Density

designed
method

is

generally

to

and

use

GeR

used

the

method

MFM

do

for

double

method

not

for

match

density

double
the

standard

recording.

density

recording.

model

of

The

the

FDD

FDD.

has

(1)
(2)

(a)

eliminating

By
the

da
density
with

the

great

The

MFM

data

density

without

(track

500KHz

Summary

Data

bit
Clock
following

No

data

ta

density

on

the

addition

increased

method

taking
formatting).
for

FD-55G.

of

MFM

(0)

bit

(C)

two

bit

the

to

disko

of

in

has

to

flux

into

method:

is

located

is

located
conditions
has

been

redundancy

be

doubled

FDD

controller

PLO

circuit,

the

recording

three

frequency

transition

consideration

Data

transfer

at

at
are

written

of

the

the

satisfied:

the

FM

without

increasing

will

hut

this

capacity.

~omponents,

density

the

necessity

rate

center

of

leading

in

the

praceding

method,

necessarily

is

ratio

is

250KHz

the

edge

the

MFM

the

compensated

lF,

4/3F

is

1

(redundancy

of

gaps

for

bit

cello

of a bit

bit

c~ll.

method
flux
be

and

more

enables

transition

compricated

for

by

2F.

the

The

:0)

and

ID

field

FD-55A ~ Fand

cell

when

the

(b)

No

In

the
not
Phase
window.
The
The
pulse

transitions.

data

MFM

always

locked

most

phase

from

bit

will

metnod,
necessary

oscillator

appropriate

shall

the

be

FDD

be

written

a

clock
as

window
locked
locates

the

(PLO)

so

bit

clock

is

that

at

-

in

at

is

l~s

the

267

the

the

will

used

for
the
center

-

present

leading

be

to

generate

tl

leading

between

hit

cello

·edge

regenerated

and

2~s

edge

two

of

the

for

of

each
in
clock

t2
the

data

bit

the

and

in

Fig.220.
READ
window

cell

FOO

is

controlle

data

DATA

Bit

cells

1

o o

o

I 1 I

Bit

1

cell

1

(4l.Js)

o

1 o

MFM
FDD

MFM

Note:

(Fig.220)

Lt
possible
therefore
by

WRITE/READ

data

window

4/3F

The

above

a

half

of

Bit

is

important

to

necessary

the

read

(6

s)

timings
the

indicated

correspondance

for

the

obtain

output

the

that

peak

D

(50%

(JJs)

PLO

widest

the

shift

t2

of

are

values.

and

circuit

window

PLO

(2lJs)

data

for

data

does

from

tl

I

cycle)

FO-55A ~ F.

window

to

generate

margin

the

not

magnetic

for

respond

in

D D

D

Timings

the

an

accurate

data

to

head.

2F

(4Us)

MFM

reading.
bit

It

for

method

window

shift

must

FO-55G

It
caused
be

are

as

is

designed
during

field.

Write
method

effectively.

bit

opposite

However,

on

appropriate
each
effects

several

pre-compensation

for

pattern,

the

overall

FDD

to

respond

the

direction

the

degree

value

and

such

slowly

synchronizing

bit

shift

Since

the

disko
as

the

position

in

of

frequency

of

Large

an

increase

so

is

generally

which

direction

of

anticipation.

bi~

shift

characteristics

write

pre-compensation

pre-compensation

that

bytes

contributes

the

in

bit

-

268

the
at

used

of

flux

during

shift

-

data

the

as

bit

shift

transition

read

of

at

window

head

the

to

the
should

value

the

will

of

10

active

the

window

can

can

operation

FOD

results

outer

field

compensation

be

predicted

be

depends

system

be

determined

tracks,

be

phase-locked
or

margin

shifted

and

in

undesirable

data

by

the

in

the

largely
the

most

for

decrease

in

read'

output

and a poorer

SjN

ratio

due

to

the

increased

use

of

the
bandwidth.
From

these

reduced

minimum
The

simplest

FOO

has
margin
When

less
not

you
than

to

Disk

considerations

by

increasing

of

write

been

in

this

use

±250nsec

cause

interchangeability

pre-compensation
solution
designed

way_

the

write

for

the

undesirable

it

will

the

frequency

is

to

per

form

to

provide

reliability

pre-compensation,
FD-55A ~ Fand

effect

suffers

be

seen

characteristics

shoulä

no

be

write

be

less

by

over

as a result.

that

bit

shift

used.

pre-compensation
and

sufficiently

careful

than±62.5nsec

compensation.

of

to

the

use

should

FOO

the

for

be

and

the

and

the

wide

window

value

FD-55G,

-

269

-

7733

TEAC

Corporation of America

Telegraph

Rd.,

[213]

726-0303

Montebello, CA

90640