Teac FD-55AV Manuale utente

TEAC

FD-55AV/

MINI FLEXIBLE DISK DRIVE

MAINTENANCE

MANUAL

REV.

TEAC

FD-5SAV

MINI

=~XI3LE

DISK

DRl~JE

H.~INTI:N;'_~G

P.Jl..NU;lL

- i -

TABLE

CONTENTS

Title

Page

SECTION 3

THEORY

OPERATION

300

3-1

CONSTRUCTION

AND

FUNCTION

301

3-1-1

General

Block

Diagram

301

3-1-2

Mechanical

Section

302

3-2

CIRCUIT

DESCRIPTIONS

307

3-2-1

Read

Write

Circuit

307

3-2-1-1

Mode

selector

(for

read

write

circuit)

309

3- 2

-1

- 2

a d c

ire

it.

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

311

3-2-1-3

Wri

circui

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

315

3-2-1-4

Low

voltage

sensor

317

3-2-1-5

Function

and

operating

waveform

read

write

LSI

terminals

318

3-2-2

Control

Circui

326

3-2-2-1

Strap

circui

328

3-2-2-2

LED

and

head

load

control

circuit

......•......................

329

3-2-2-3

Write/erase

control

circuit

333

3-2-2-4

Mc>tor

gate

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

335

3-2-2-5

Ready

detector

336

3-2-2-6

Stepping

motor

control

circuit

339

3-2-2-7

Track

counter

343

3-2-2-8

Other

terminals

and

function

control

LSI

344

3-2-2-9

Interface

driver

346

3-2-3

Servo

Circuit

347

3-3

FUNCTION OF

TEST

POINTS

AND VARIABLE

RESISTORS

3~8

3-3-1

Function

Test

Points

349

3-3-2

Function

Variable

Resistors

354

Title

Page

SECTION 4

MAINTENANCE

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

4000

-1

GENERAL.............

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

4001

4-1-1

Periodic

Maintenance

4001

4-1~2

Check

and

Adjustment

4002

4-1-3

Maintenance

Jigs

and

Tools

4003

4-2

PRECAUTIONS...............................................

. . . . . .

4007

4-2-1

Torque

Applied

Screws

and

Locking

Paint

4007

4-2-2

Handling

Connectors

4008

4-2-3

Head

Cable

Treatment

4013

4-2-4

Initial

Setting

SKA-G

and

SKA

4015

4-2-4-1

Cable

connection

and

setting

power

supply

voltage

4015

4-2-4-2

Setting

the

maximum

track

number

4018

4-2-4-3

Setting

step

rate

and

settling

time

•.....................

4018

4-2-4-4

Level

disk

calibration

4021

4-2-4-5

Alignment

disk

calibration

4023

4-2-4-6

Humidi

setting

4026

-2-4

- 7

Setting

SKA

gain

4026

4-2-4-8

Setting

FDD

straps

and

SKA

special

key

4027

4-2-5

Others

4029

4-3

PREVENTIVE

MAINTENANCE

4032

4-3-1

Cleaning

Magnetic

Head

Cleaning

Disk

4032

4-3-2

Direct

Cleaning

<Single

sided}

4034

4-4

CHECK

AND

ADJUSTMENT

4036

4-4-1

Adjustment

Set

Arm

Position

4036

4-4-2

Check

and

Adjustment

Holder

Position

....•....................

4038

4-4-3

Check

and

Adjustment

Arm

Lifter

4041

4-4-3-1

[)()uble

sided

4041

4-4-3-2

Single

sided

4051

4-4

-4

Check

CSS

Ass'

Y-.f054

4-4-5

Check

File

Protect

Sensor

............•.......................

4058

4-4-6

Check

Disk

Rotation

Speed

4061

4-4-7

Check

Erase

Gate

Delay

4063

4-4-8

Check

Head

Touch

4066

iii

4-4-9

Title

Check

and

Adjustment

Asymmetry

Page

4072

Check

and

Adjustment

Track

Alignment

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

4084

Check

and

Adjustment

Track

Sensor

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

4093

Check

and

Adjustment

Track

Stopper

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

4100

Check

and

Adjustment

Index

Burst

Timing

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

4105

4077

4080

Check

Resolution

Check

Read

Level

4-4-10

4-4-11

4-4-12

4-4-13

4-4-14

4-4-15

4-5

MAINTENANCE

PARTS

REPLACEMENT

4110

4-5-1

Replacement

Head

Carriage

Ass'y

........................•.....

4110

4-5-1-1

4-5-1-2

Replacement

v-type

carriage

Replacement

L-type

carriage

4110

4117

4-5-2

Replacement

Stepping

MQtor

Ass

4121

4-5-3

Replacement

motor

Ass'y

<Spindle

motor},

4124

4-5-4

Replacement

Collet

Ass'y

4126

4-5-5

Replacement

Head

Load

Solenoid

........•......................

4127

4-5-6

Replacement

Track

Sensor

Ass'y

4129

4-5-7

Replacement

PCBA

MFD

Control

4130

4-5-8

4-5-9

Replacement

PCBA

Front

OPT

Replacement

Front

Bezel

Ass'y

4132

4133

4-5-10

Replacement

Front

Lever

Ass'y

4134

4-5-11

Replacement

CSS

Ass'y

4135

4-5-12

Replacement

Head

Pad

(Single

sided)

.........•................

4136

SECTION 3

THEORY

OPERATION

300

3-1.

CONSTRUCTION

AND

FUNCTION

3-1-1.

General

Block

Diagram

Read

write

circuit

READ

DATA

SIDE

QNE

SeLECT

WRITE

DATA

DRIVE

Sc.:LECT

()'\..3

WRITE

GATE

MOTOR

STEP

DIRECTION

SELECT

USc.:

HEAD

LOAD

TRACK

INDEX

WRITE

PROTECT

READY

+12V,+SV,OV

Cunt.rol

circuit

Indi-

cator

Servo

circuit

Magnetic

head

Head

load

solenoid

Track

sensor

Stepping

motor

File

protect

sensor

LED

Index

sensor

Index

sensor

LED

Spindle

motor

(Fig.30l)

General

block

diagram

301

3-1-2.

Mechanical

Section

Since

the

disk

flexible

recording

media

made

mylar

film

base

and

data

interchangeability

between

disks

and

FDDs

required,

the

mechanical

section

the

FDD

uses

precision

parts

and

also

assembled

carefully

and

precisely.

For

this

reason,

only

trained

technicians

can

handle

the

internal

mechanism.

Never

apply

excessive

impact

nor

drop

the

FDD

down

the

desk.

The

mechanical

section

constructed

with

frame,

door

mechanism,

disk

clamp

mechanism,

disk

rotation

mechanism,

magnetic

head

and

carriage,

head

load

mechanism

(or

CSS

mechanism),

head

seek

mechanism,

various

detection

mechanisms,

etc.

(1)

Frame

The

main

structure

for

mounting

the

various

mechanisms

and

printed

circuit

boards.

The

frame

made

aluminum

diecast

maintain

the

stability

the

FDD

strength,

precision,

durability,

and

expansion

coefficient.

(2)

Door

mechanism

and

disk

clamp

mechanism

The

door

mechanism

constructed

with

the

main

parts

set

arm

which

forms

the

structure

for

installing

the

disk

the

spindle;

other

parts

front

lever,

clamp

arm,

etc.

The

set

arm

attached

the

rear

the

frame

with

leaf

spring

and

the

tip

the

set

arm

collet,

which

forms

the

disk

clamp

mechanism,

attached.

When a

disk

inserted

and

the

door

closed,

the

collet

inserted

into

the

center

hole

the

disk

and

the

disk

clamped

the

correct

position

along

the

outer

circumference

the

collet.

(3)

Disk

rotation

mechanism

The

disk

rotation

mechanism

comprises

motor

Ass'y

which

includes

302

spindle.

The

motor

outor-rotor

type

brushless

motor

which

has

the

long

life

30,000

hours

continuous

rotation.

The

rotation

speed

300rpm

for

models

360rpm

for

model

and

maintained

stable

condition

against

load

variations

and

environmental

changes.

This

achieved

feedback

signal

from

the

internal

tachometer.

The

collet

and

the

spindle

are

combined

precisely

maintain

the

center

position

correctly

without

damaging

the

center

hole

disk

and

make

the

head

contact

with

the

disk

correct

position.

(4)

Magnetic

head

and

carriage

Read/wri

core

gaps

___

Rota

tional

direction

disk

Erase

cores

(Fig.302)

External

view

magnetic

head

core

The

magnetic

head

assembly

(head

carriage

Ass'y)

single

sided

model

model)

button

type,

which

mounted

the

carriage

contact

with

the

head

window

area

the

side

surface

disk

(down

surface

when

the

FDD

situated

horizontally).

For

double

sided

model

(B,

model),

both

the

side

head

and

the

side

head

are

special

flat

type

supported

with

the

gimbaled

mechanisms.

The

two

magnp.tic

heads

are

mounted

accross

the

disk

one

carriage

(head

carriage).

both

types

head,

the

surface

designed

for

iltinimWii

disk

wear

and

maximum

read

output.

The

head

itself

long

life

type

for

improved

head

wear.

Each

head

constructed

with

read/write

gap

303

used

for

data

reading

and

data

writing

and

two

erase

gaps

erase

the

recorded

track

edge

immediately

after

the

recordinCJ

(tunnel

erase).

The

magnetic

ehad

and

the

carriage

form

the

core

section

the

FDD

and

specially

assembled

with

high

precision.

(5)

Head

load

mechanism

CSS

mechanism

The

head

load

mechanism

used

for

models

with

head

load

solenoid

and

the

CSS

mechanism

used

for

double

sided

CSS

model

without

head

load

solenoid.

The

head

load

mechanism

functions

make

the

head

contact

with

disk

when

only

required

reduce

disk

and

magnetic

head

wear.

This

mechanism

constructed

with

head

load

solenoid,

arm

lifter,

etc.

the

head

executed

for

single

sided

model,

the

head

pad

attached

the

pad

arm

the

carriage

depressed

lightly

against

the

side

surface

disk.

For

double

sided

model,

the

side

head

attached

the

upper

arm

the

carriage

depressed

against

the

side

surface

disk

with

appropriate

pressure.

The

side

surfaces

the

head

and

the

disk

are

set

the

same

height

and

the

depression

the

side

head

produces

the

stable

contact

between

the

heads

and

the

disk.

the

CSS

model,

the

magnetic

heads

are

always

contact

with

disk

far

the

disk

installed.

order

elongate

the

disk

and

head

leves,

required

make

the

disk

rotate

only

when

necessary.

The

CSS

mechanism

constructed

with

aCSS

ASs'y

which

designed

protect

the

contact

side

and

side

heads

directly

when

the

front

lever

closed

without

disk.

For

the

purpose

protecting

the

head

being

caught

and

damaged

the

head

window

edge

during

disk

insertion

and

ejection,

head

protector

also

equipped

the

CSS

mechanism

lift

the

disk

jacket.

The

head

protector

also

used

304

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