Sharp FDD-412A Manuel utilisateur

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SHARP

_

SERVICE

MANUAL

FLOPPY

DISK

DRIVE

mopeEL

FDD-412A/B

.

GENERAL

_

PRINCIPLES

OF

OPERATION

_

MAIN

TENANCE

.

TROUBLESHOOTING

.

PARTS

LIST

&

GUIDE

SHARP

CORPORATION

FDD412A/B

CONTENTS

THIS

MANUAL.

This

manual

provides

service

and

all

maintenance

and

service

information

to

support

the

slim,

2-side

double-density

floppy

disk

drive

FDD-412A

and

FDD-412B.

Before

attempting

any

service

or

repairs,

take

time

to

familiarize

yourself

with

this

manual

to

make

your

servicing

easier

and

more

efficient.

Currently

this

floppy

disk

drive

use

as

bellow

mentioned

model.

Also

intentionaly

will

be

use

to

other

model.

UNIT

NAME

PARTS

CODE

APPLIED

PRODUCT

MODEL

FDD-412A

DUNTK3010SCZZ

Office

computer

HAYAC-2900

SYSTEM

CO2900E

CO02902E

HAYAC-3900

SYSTEM

CO3906E

CO3900E

CO3902E

CO3903E

CO3904E

CO3905E

CO3906E

CO3907E

Personal

computer

MZ1F05

POS

system

OM18FD1

FDD-412B

DUNTKS3011SCZZ

HAYAC-2900

SYSTEM

CO2900E

Personal

computer

MZ1F05

POS

system

OM18F

D2

GENERAL

.........-2

eee

Overview

......eeeeeee

FOaATULES

sce cca

cee

es

PRINCIPLES

OF

OPERATION

(Oy

need

0

|

=

ee

Configuration:

..c.c6.%

.1

Drive

Mechanism

....

.2

Control

Electronics

SUSCTTLCALIONS

eines

.l1

Performance

Specific

.2

Power

Requirements

.

.3

Mounting

Specificati

.4

Environment

Specific

.5

Reliability

Specific

Recording

Media

cea

.l

Medium

Type

........

.2

Handling

of

Recordin

.3

Recording

Methods

..

-4

Data

Format

........

Logic

Operations

.....

.l1

Sensor-Related

Opera

-2

Seek

Operations

....

.4

Data

Write

Operation

.5

Data

Read

Operation

CONTENTS

Pr

ee

ee

ed

re

woke

atetlave,

Gao

witan

bl

etseb

Boece

ACR

aerate.

anda

eae

ate

sgh

we

dav

esas

sateen

oo

8i-2h

8

vaysSiare

a

ole

otiouel

teres

abel

ent

stevens

eB

a

ele

ces

eat

OS

aie

ial

a

Seite

eee

8

eae

Boe

Se

barea

Sicha

ate

heNer

Rca

las

eite

se:

MIRTe

wide

ais

Sedelanac

eters

Shela

a

elsekir

lorie

ton'o

v's

Swabia

(lob:

SiewiSre

elergcontue

a

vershane

tardies

a

ave

Nente

Gey

deviant,

Crane

hasanesereteyslaherane

wasiev

paemarens

SELONS

tectos

eens

big

Gesa

tie

Sane

fore-aes

Ssidisal

SC

Sisce

ete

be

ihe

8

Read

Se

SP

SAS

eee

OWS

=

os

acces

cetesiar

es

See

ere

te

eee

Se

A

os

ese

Ss

AC

TOWS:

ee

vaca

fovea:

eleravete

eerd

ovelecwed’s

eielale

es

BEDLONSH

“ove

sevesel

Bist

wia

te

eee

weil

Sid?

ae

Sadak

scar

aires

bis

whe

Sg

ahaa

es

ere,

6M

ace

cated

ecereie

dele

elie

svesial's

ica ile

Saha

re

ob

fore

S.

ook:

Sud

eh

ae

re

ata

alae

Sie,

«|

Saree

GZ

Media

..

cece

cee eee

ec

eee

reer

eees

Bi

Dea

ed

BR

Lave:

Site

6

GA

ie

tak

AS

ONS

APES

RES

TT

Sea

aS

oye

ee

te

SBS

Seca

ie

wo

dds

sw

che

Se

ere

See

Pe

ee

EDOTIS©

sieves

faite

esdesele

nbven

Sd:

6

anette

er

ee

8

ea

2

eee

:

ed

.3

Magnetic

Head

Composition

and

Its

Related

Operations

..

ed

ee

FDD412A/B

10

11

11

12

12

13

13

14

15

15

17

19

20

22

FDD412A/B

2.5.6

Operations

Related

to

Spindle

Motor

Drive

Mechanism

...

2.5.7

Overall

FDD

Operations

(Timing

Charts)

.............:..

Goes

SULCUS

ACE

sxe aca

pea

tae

wae

gel

wetee

ek

ee

Mawes

So

ok

2.6.1

Connection

of

Floppy

Disk

Controller

(FDC)

to

FDD

.....

2.6.2

Device

Configuration

in

Daisy

Chain

Connection

........

2.6.33

Inter

hace.

Siena

lsc

<

sec

veceteaswvenenel

ovens

vecte

svaud.

Salebate

Gubboea

vrei

26.4

Interface

‘Signal:

‘Timing:

25

ts.

wei

aiianis

wed

ob

ob

cw

ieoeelees

3s.

“HANDLING

>

secco5

5

eStats

wee

dalale

aw

eels

Gree

Deter

Wave

ews

gaeies

8.0

Hand]

ing.

Procedures-a..

nity

ssw

ee

eta

awa

wes

Po

ieateas:

cae

3.1.1

Floppy

Disk

Not.

in

USE

ose.

ee

ck

es

eee

dee

cee

ee

oe

ean

3,14.2

Insertion

of

BLoppy:

Disk

~

wesc

S08

eres

ob

ese

e

eS

SER!

pass

3.1.3

Opening/Closing

of

Door;

Floppy

Disk

in

Use

...........

3.124

Removal’

of

Floppy

(Disk

..c.ccuiewio

Ss

Se

Moe

oes

aie,

aecateees

3.1.5

Handling

of

Floppy

Disk

.....

feet

e

eee

ee

eee

Stee

e

eee

eee

Be

Tbs

sRELOCAELGT

tected

t

ace

te

Wate

Wav

eue

te

leceely

Suayenepe

alana

betel

srgaeca

Boeie

BG

RAS

3.1.7

Packaging,

Transit

and

Storage

......

eee

ee

ee

ee

ees

$72.

“Setting

of

FORD

Operation

Mode...

a

qcted

easton

see

es

i

rates

3.2.1

Operation

Mode

Changed

by

Shorting-Plugs

Seana

careers

lables

eae

s

3.2.2

Shorting-plug

Presetting

Position

oe

Shipment

EYTOM:

PACCOLY:

25

Seiad

g

he

nk

seis

wi

ecte

ete

oes

rereece

sells

Fae

Bronese

Sis

arer

loves

oe

nc

MAINTENANCE:

onctead

ieanadteanien

Sane

aria

d

aieae

Aeeee

ye

laees

4.1]

Maintenance

Items

......

Be

thle

lets

Meinatccen

es

eae

ee

a.2

.Parts

Replacement

Procedures.

is.siaswashae

sven

yenauwe

ers

4.2.1

Common

Work

1:

Top

Cover

......

ee

ee

A.

2.2:

Common;

Work:

22

Pilate

Opening/Closinge

sss.

denc-ee

esas

4.2.3

eae

Work

3:

Wire

Handling

and

Wire

Routing

........

hy

Oe

PER

Assembly

“(PCCI4))

csi

ancecod

Ue

daein

he

beam

SS

G4

dale

es

Page

28

29

82

82

33

84

85

45

45

45

45

45

46

46

48

49

49

49

53

54

54

55

55

55

56

58

oO

.

10

il

sed

13

14

jab

.

16

17

18

.19

Motor

(DD

Spindle)

.......

Head

Load

Solenoid

.......

Head

Load

Bail

Assembly

...........--

ion

d

sae

wa,

ayectn

toes

Sua

arate

ely

O

Sensor

Assembly

LL...

eee

ee

ete

eee

ee

eee

teens

Protect

Sensor

Assembly

...

ec

cece

ee

eee

ete

eee

eet

e

eres

Index

Sensor

Assembly

....

Index

LED

Assembly

.......

MiCroOSWIECH..

i.

cd

dsvcdeers

ee

Center

Cone

Assembly

....

Plate

Assembly

..........-.

Indicator

Assembly

.......

Door

Lock

Assembly

.......

DOGY’

-BUETON:

63s

cbreOee

ae

eats

FPH-H680T

Assembly

.......

Setp

Motor

..ceeeeeseeeees

Adjustment

Procedures

......

TROUBLESHOOTING

.....--------

Troubleshooting

Flowchart

..

Media-Related

Troubles

.....

.

ho

Troubleshooting

Procedure

Pr

ee

ee

Pe

ee

ee

ee

ee

ae

ee

er

er

ee

wee

tee

eer

meee

eee

nee

erro

eee

ene

a

er

Pe

ee

Pe

er

ee

SS

i

a

ae

a

a

ee

ee

Pe

ed

.1

Head

Position

(Tracking)

Adjustment

.......-e

eee

eeeeees

.2

0

Track

Sensor

Position

Adjustment

......-...-e-eeeeeee

.3

Bail

Stopper

Elevation

Adjustment

.......---eeeeeeeeeee

Pe

ee

ee

er

Pe

Pictures

of

Normal/Abnormal

Readout

Waveshapes

........

Major

Floppy

Disk

Failures

Pe

a

ee ee

FDD412A/B

60

61

62

62

63

64

64

65

66

67

67

68

70

71

71

74

75

77

77

85

85

85

85

93

FDD412A/B

for)

a

for)

fo)

for) for)

for)

jor)

on

>

eo

iw)

a

des

3

3ie

Medi

um

Management.

sticc2eat

4

fa

tea

weet

ek

aes

ee

eit

oe

1

Necessity

of

Medium

Management

ee

a

2>

TMe@

Pum:

Wie

is

fe

F

ents

obs

eb

sa

ee

afew

ee

Cae

oe

aieeee

ei

aes

te

CONTROL.

BOARD:

ssscstieecenttiesenneciect

ells

beh

th

weetestintins

feds

casseseeneeous

Control

Board

Schematic

Drawings

—

]

crcccesctecsseesecseeesseereeenes

Control

Board

Schematic

Drawings

—Q--cceece

ce

cteees

tects

cseeseeeaes

Control

Board

Schematic

Drawings

—

Q

errs

tec

teeeenecetes

Control

Board

Schematic

Drawings

—

deri

tet

eenies

FDD412

A/B

Operating

mode

Setup

Method

vrvcrcrc

cece

Parte

Layout

Chart

45

0.04

wine

wiaieiS

ele

Biel

Wl,

e

Sidin

wig

elt

O10

Sieg

deioletaie

Gide

oig

Gig

a

via

plaid

sy

baictoa

badd

Uae

daeeevanudes

101

102

108

104

105

107

bel

FDD412A/B

GENERAL

Overview

The

FDD-412A/B

floppy

disk

drive

(FDD)

is

a

slim,

energy-saving,

lightweight

FDD

that

accommodates

2-sided,

double-density

floppy

disks,

based

on

the

technologies

implemented

in

the

widely

used

FDD-101A/201/

401/102D/402D/403D

FDD..

The

FDD-412A

(Model

A)

incorporates

a

VFO,

while

the

FDD-412B

(Model

B)

has

no

VFO.

The

user

can

select

either

depending

on

whether

there

is

a

controller

VFO

or

not.

The

standard

specifications

of

the

FDD

are

as

follows:

Mae

(1)

(2)

(3)

(4)

(5)

(6)

File

protection

:

Transparent

Top

cover

color

.:

.

Black

Door

lock

:

Electromagnetic

door

lock

mechanism

Features

Slim

lined

The

body

is

only

half

as

wide

as

conventional

types.

This

makes

it

possible

to

install

2

units

in

a

space

for

a

single

conven-

tional

type.

Lightweight

The

FDD

weights

3.5

kg

or

less.

This

weight

is

about

70%

of

that

of

our

existing

models,

making

handling

procedures

much

easier.

Field-proven

brushless

direct

drive

system

Our

field-proven

brushless

direct

drive

system

is

implemented

in

a

narrower

enclosure.

This

system

is

much

more

reliable

than

the

belt

system

or

brush-

based

direct

drive

system.

Without

any

parts

to

be

replaced

periodically,

the

system

is

of

a

complete

maintenance-free

design.

‘There

is

no

need

to

distinguish

50Hz

and

60Hz

in

frequency.

Convenient

VFO

connecting

interface

Up

to

4

FDDs

can

be

connected

to

the

controller.

If

a

system

con-

figuration

includes

one

model

A

FDD,

all

FDDs

can

be

connected

to

the

VFO

interface

regardless

of

the

other

three

being

of

model

A

or

B.

This

promises

configurations

of

high

cost-performance.

2-DC

power

supply

A

2-DC

power

supply

system

has

replaced

the

3-DC

power

supply

system.

This

has

reduced

the

average

power

consumption

to

about

57%

of

that

of

our

existing

models.

LSI-based

circuitry

Dedicated

LSIs

constitute

the

greater

part

of

circuitry.

Without

any

parts

to

be

replaced

periodically,

higher

reliability

and

much

better

maintenability

can

be

realized.

.

FDD412A/B

(7)

Electromagnetic

door

lock/umlock

mechanism

The

controller

is

equipped

with

an

electromagnetic

door

lock/unlock

mechanism

that

prevents

an

inadvertent

opening

of

the

door

during

operation.

pene

Fig.

1.1

Outside

View

of

FDD-412A/B

Floppy

Disk

Drive

2.

PRINCIPLES

OF

OPERATION

2.1

Outline

The

FDD

(floppy

disk

drive)

is

a

device

that

writes

and

reads

data

to

and

from

the

floppy

disk.

As

shown

in

Fig.

2.1,

a

floppy

disk

has

77

concentric

"tracks"

on

either

surface

(i-e.,

154

tracks

on

both

sides).

Data

is

sequentially

recorded

on

each

track.

A

carriage

has.one

magnetic

head

on

each

side

respec-

tively,

and

read/write

data.

It

moves

radially,

processing

data

on

the

tracks.

To

write

or

read

data

to

or

from

a

given

location

on

the

floppy

disk,

the

following

steps

are

required:

(1)

The

magnetic

head

and

recording

medium

are

given

a

relative

velocity.

(2)

The

magnetic

head

is

positioned

over

the

target

track.

(3)

The

target

data

is

searched

from

among

numerious

data

records

written

on

that

track.

:

(4)

The

data

is

read

from

or

written

onto

the

record.

FDD412A/B

.hese

operations

and

their

control

are

shared

by

the

FDD

and

FDC

(floppy

disk

controller).

Each

of

the

above

steps

is

further

explained

below.

(1)

(2)

(3)

Floppy

disk

Track

Magnetic

head

Fig.

2.1

Floppy

Disk

The

magnetic

head

and

recording

medium

are

given

a

relative

velocity.

Data

is

sequentially

recorded

(i.e.,

in

bit-series)

on

floppy

disk.

For

data

processing,

it

then

becomes

necessary

to

move

the

mag-

netic

head

relative

to

the

medium.

This

is

achieved

by

rotating

the

floppy

disk.

The

motion

is

provided

by

an

FDD

spindle

motor,

which

rotates

at

a

constant

speed

for

correct

reading.

Applying

power

to

the

FDD

rotates

the

spindle

motor.

With

a

floppy

disk

inserted

and

the

door

closed,

the

disk

is

secured

to

the

spindle,

ready

for

revolutions.

The

magnetic

heads

are

fixed

to

the

FDD.

As

the

floppy

disk

rotates,

a

relative

velocity

is

pro-

duced

between

the

heads

and

the

disk.

The

floppy

disk

has

an

index

hole

to

determine

the

start

point

on

each

track.

The

FDD

senses

the

index

hole.

When

the

disk

rota-

tion

is

found

normal,

the

FDD

enters

a

ready

state

and

can

be

subject

to

control

from

the

FDC.

The

magnetic

head

is

positioned

on

the

target

track.

The

magnetic

head

is

then

positioned

on

the

target

track

among

many

concentric

tracks.

The

positioning

is

done

by

moving

the

head

radially.

How

far

the

head

should

move

is

calculated

by

the

FDC

as

the

positional

difference

between

the

current

track

and

the

target

track.

The

FDD

receive

pulses

indicating

the

amount

of

magnetic

head

relocation.

The

FDD

has

a

step

motor

to

which

the

magnetic

heads

are

secured.

One

pulse

causes

the

head

to

move

by

1

track.

In

this

manner,

the

head

is

positioned

on

the

target

track.

The

target

record

is’

searched.

When

positioned

on

the

target

track,

the

head

reads

out

data

from

the

track.

To

minimize

wear,

the

FDD

is

designed

so

that

the

head

comes

in

contact

with

the

disk

surface

only

upon

reading/writing.

The

FDC

issues

a

HEAD

ENGAGE

command

to

the

FDD

for

contact

between

the-

head

and

the

disk.

:

FDD412A/B

(4)

Ze

The

The

FDD

reads

out

the

data

from

disk

and

sends

it

to

the

FDC.

The

FDC

searches

the

target

record

as

it

reads

data

on

the

track.

One

record

consists

of

an

ID

part

(identifier)

and

a

data

part.

Reading

the

ID

part

reveals

whether

or

not

the

record

is

what

is

needed.

Index

:

Index

VY

V

IDO

!

Data

0

|

ID1

!

Data

1

|

ID2

:

Data

2

{

:

EL

RCCOEE

Soe

IDn

!

Data

n

Fig.

2.2

Data

Arrangement

on

Track

The

data

is

read

out

or

written

in.

When

the

target

record

is

found,

data

is

written

to

or

read

from

the

data

part.

The

magnetic

heads

of

the

FDD

are

used

for

both

heading

and

writ-

ing.

When

a

write

command

is

given

by

the

FDC,

a

current

flows

in

the

magnetic

head

and

all

readout

operations

are

suppressed.

That

is,

the

FDD

performs

either

a

write

or

readout

operation

at

any

one

time,

not

both

simultaneously.

The

data

read

from

disk

is

of

analog

waveshapes,

which

are

digitized

by

the

FDD

for

trans-

mission

to

the

FDC.

The

model

A

FDD

incorporates

a

VFO

circuit,

and

is

capable

of

demodulating

the

data

that

was

modulated

by

the

so-called

FM/MFM

magnetic

recording

method.

Configuration

FDD

is

composed

of

a

drive

mechanism

and

the

control

electronics,

as

shown

in

Fig.

2.3

(on

page

14).

Zerdee

The

reo)

(2)

(3)

1

Drive

Mechanism

drive

mechanism

consists

of

the

following:

Carriage

The

carriage

is

equipped

with

2

magnetic

heads

for

side

0

and

side

1.

For

movement,

the

carriage

receives

step

motor

revolutions

via

a

steel

belt.

Step

motor

The

step

motor

turns

in

response

to

the

STEP-N

signal

from

the

controller.

Step

motor

revolutions

are

transmitted

via

the

steel

belt

to

the

carriage

which

positions

the

magnetic

head

at

a

given

location.

Spindle

motor

The

floppy

disk

medium

is

press-fit

to

the

spindle

motor

by

a

collet

for

rotation.