Seagate ST-506 Manuale utente

SEAGATE

ThCHNOLOGY

ST-506

MICROWINCHESfER

SERVICE

MANUAL

MAY

1982

360

Pueblo

Road

Scotts

Valley,

95066

Phone(408)438-6550

TABLE

<XNIENTS

SEO]CN

1.0

I~~Irn

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

••

1.1

1.2

General

Description

•••••••••••••••••••••••

••••••••••••••

Specification

Sunnary

••••••••••••••••••••••••••••••••••••

1.2

•1Phy

sic

••

"" """ eee

'" '"

'" '" '"

1.2.2

Reliability

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

1.2

•3

Per

formance

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

1.2.4

Functional

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

2.0

CPERA.TICN'S

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

2.1

General

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

2.1.1

Recording

Format

••••••••••••••••••••••••••••••••••

.1.2

ack

Format

•••••••••••••••••••••••••••••••

••••••

2.1.3

Winchester

Heads

••••••••••••••••••••••••••••••••••

2.1.4

Discs

2.1.5

Air

Filtration

Systern

•••••••••••••••••••••••••••••

2.2

Mechanical

Theory

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

2.1.1

Track

Sensor

•••••••••••••••••••••••••••••••••••.•

2.2.2

2.2.3

2.2.4

Index

Sensor

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

Ground

Spr

ing

•••••••••••••••••••••••••••••••••••••

Spindle

Brake

.......•....•.......................•

2.3

Electrical

Theory/Flowchart

••••••••••••••••••••••••••••••

2.3.1

Motor Speed

Control

•••••••••••••••••••••••••••••••

2.3.2

Auto

Recalibration

•••••••••••••••••••••••••••••••

2.3.3

Drive

Selection

•••••••.••••••••••••••••••••••••••

SEO]CN

TABLE

a:NIENTS

2.3.4

2.3.5

Step

(peration

•••••••••••••••••••••••••••••••••••

Read

Cperation

•••••••••••••••••••••••••••••••••••

2.3.6

Write

Cperation

••••••••••••••••••••••••••••••••••

2.4

Test

Point

Description

•••••••••••••••••••

••••••••••••••

2 • 5 Schana

tic

s••••••••••••••••••••••••••••••••••••••••••••••28

~I~<:E/REI>AIR

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

3.1

3.2

Introduction

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

Rexnovals

And

Adjusttnents

••••••••••••••••••••••••••••••••

3.2.1

Main

Control

P.C.B

•••••••••••••••••••••••••••••••

3.2.2

Motor

Control

P.C.B

••••••••••••••••••••••••••••••

3.2.3

Spindle

Brake

••••••••••••••••••••••••••••••••••••

3.2.4

Index

Sensor

•••••••••••••••••••••••••••••••••••••

3.2.5

Ground

Spring

••••••••••••••••••••••••••••••••••••

3.2.6

Track

Sensor

•••••••••••••••••••••••••••••••••••

•7 FrontCover

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

3.2.8

3.2.9

Front

Cover

LED

••••••••••••••••••••••••••••••••••

Side

Franles

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

4.0

ILLUSTRATED

PARTS

CATALOG

••••••••••••••••••••••••••••••••••••

4.1

4.2

Physical

Locations

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

4.1.1

Drive

Exploded

View

••••••••••••••••••••••••••••••

4.1.2

Connectors

Exploded View

•••••••••••••••••••••••••

Carr~onent

Locations

•••••••••••••••••••••••••••••••••••••

SEO]CN

TABLE

c:INIFNrS

4.2.1

Main

COntrol

p.e.B.

PfiN

20019

•••••••••••••••••••

4.2.2

Main

COntrol

P.C.B.

20040

•••••••••••••••••••

4.2.3

Motor

Control

P.C.B.

P/;N

20003

••••••••••••••••••

4.3.1

Main

Control

.C.B.

PjN 20019

•••••••••••••••••••

4.3.2

Main

Control

.C.B.

20040

•••••••••••••••••••

4.3.3

Motor

Control

.C.B.

PIN 20003

••••••••••••••••••

4.3.4

Spare

Parts

List

••••••••••••••.•••••••••.••••••••

iii

LIST

CF ILllSTRATICNS

FIGlRE

2.1

ack

Format

••••••••••••••••••••••••••••

•••••••••••••••••••••

2.2

Test

Point

1Tim.ing

•••••••••••••••••

•••.•••

••••••

••••••••

••

2.3

Test

Point

Tilning

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

2.4

Test

Point

4Tim.ing

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

2.5

Test

Point

Tilning

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

2.6

Test

Point

and

8Tim.ing

••••••••••••••••••••••••••••

•••••

•••

2.7

Test

Point

11 and

Tilning

••••••••••••••••••••••••••••••••••

2.8

Tes

Point

Layout

p.e.B.

20019

••••••••••••••••••••••••

2.9

Tes

Point

Layout

- P

.C.B.

20040

••••••••••••••••••••••••

LIST CF

TABLES

TABLE

2.1

Step

Pulse

Encoding/Phase

Sequencing

•••••••••••••••••••••••••

Introduction

1.0

INTRODUcnON

1.1

General

Description

ST-506

Service

Manual

The

ST-506

disc

drive

random

access

storage

device

with

two

non-fcmovable

i/4

inch

discs

storage

media.

Each

disc

surface

emplQYs

one

moveable

head

service

153

data

tracks.

The

total

formatted

capacity

the

four

ads

and

surf

meg

abyt

(32

sectors

per

track,

256

bytes

per

sector,

612

tracks).

four

drives

may

daisy

chain

connected

one

system.

Low

cost

and

unit

reliability

are

achieved

through

the

use

band

actuator

and

open

loop

stepper

head

positioning

mechanism.

The

inherent

simplicity

m.echanical

construction

and

electronic

controls

allows

maintenance

free

operation

throughout

the

life

the

drive.

Both

electronic

PCB's

are

mounted

outside

the

HDA

for

field

serviceability.

Mechanical

and

contamination

protection

for

the

heads,

actuator

and

discs

are

provided

impact

resistant

aluminum

enclosure.

self

contained

recirculating

system

supplies

clean

air

through

0.3

micron

filter.

second

port

the

filter

assembly

allows

pressure

equalization

with

ambient

air

without

chance

contamination.

patented

spindle

pump

aSSUf

adequate

air flow and

uniform

temperature

distribution

throughout

the

head

and

disc

area.

Therm.al

isolation

the

stepper

and

spindle

motor

assemblies

from

the

disc

enclosure

yields

very

low

temperature

rise

within

the

enclosure,

providing

significantly

greater

off-tr

ack

margin

and

the

ability

immediately

perform

read

and

write

operations

after

power

with.nothermal

stabilization

delay.

The

ST-506

electrical

interface

similar

the

Shugart

Associates

SA1000

family

inch

fixed

disc

drives.

The

ST-506

size

and

mounting

tic

the

industry

standard

minifloppy

disc

drives

and

uses

the

same

voltage

and

connector.

power

required.

Seagate

Technology

PAGE 1

5/1/82

Introduction

1.2

Specification

Summary

1.2.1

Physical

Specifications

Environmental

Lnnits

Sf-506

Service

Manual

Ambient

Temperature:

Ci>erating

Non-operating

Temperature

Gradient:

Operating

Non-operating

ReI

ive

HlIl1idi

Maximun

evat

ion:

Operating

Non-operating

Shock:

<»erating

r-~on-opelati.ng

:::

400

1220F

-40

1400F

(-40

'180F / Hour (100

Below

condensation

80%

Non-condensing

10,000

Feet

-1000

30,000

Feet

,lOG's

(On

side

frames)

D.C.

Power

Requiranents:

+12V

±5%,

1.8A

Typical,4.5A

At power on

+5V

±5%"

.7A

Typical,

1.0A

Maximum

Maximun

Ripple

50mv

peak

(12V,

5V)

Mechanical

Dimens

ions:

Height

Width

Depth

'¥eight

Shipping

Vleight =

Heat

Dissipation:

Typical

Maxinulm =

3.25

Inches

5.75

Inches

8.00

Inches

4.6

Pounds (2.1Kg)

7.0

Pounds (3.2Kg)

Watts

1.2.2

Reliability

Specifications

NITBF

11,000

PCH,

Typical

usage

MI1R =

Minutes

P,M:

=Not

required

Component

design

life

Years'

Seagate

Technology

PAGE 2

5/1/82

Introduction

Sf-506

Service

Manual

Error

Rates:

Soft

Read

Errors

Hard

Read

Errors*

Seek

Error

per

10 10

bits

read

per

1012

bits

read

per

106

seeks

*Not

recoverable

within

retries

1.2.3

Perfonnance

Specifications

Capaci

Unformat

ted:

Per

Drive

Per

Sur

ace

Per

Track

Formatted:

Per

Drive

Per

Surface

Per

Track

Per

Sector

Sectors

per

Track

AccessTime:

Track

Avera.ge* =

lv1ax

imum

**=

Set

ing

Time =

6.38

Megabytes

1 • 59

Meg

aby t es

10416

Bytes

Meg

aby tes

1.25

Megabytes

8192

Bytes

256

Bytes

milliseconds

170

mill

seconds

500

milliseconds

typical

*Reducible

IDS

using

fast

seek

algorithm

*Reducible

205

IDS

using

fast

seek

algorithm

Transfer

Rate:.

Average

Latency:

1.2.4

Functional

Specifications:

5.0

Megabits

per

second

8.33

milliseconds

Rotational

Speed

Recording

Density

Flux

Densi

Track

Density

Cyl

iode!

Tracks

ReadfWrite

Heads =

scs

3600

RPM

±1%

7690 BPI Maximum

7690

FeI

1vlax

imum

255

TIl

153

612

Seagate

Technology

PAGE 3

5/1/82

Theory

Oper

ations

2.0

THEORY

OPERATIONS

2.1

General

2.1.1

Recording

Format

ST-506

Servic

Manual

The

ST-506

uses

modified

frequency

modulation

(MFM)

the

encoding

method

implemented

record

data

the

drive.

This

double-density

encoding

scheme

increases

disc

data

capacity

replacing

clock

bits

with

data

bits.

Clock

bits

are

written

only

when

data

bits

are

not

ent

both

the

preceding

and

the

current

bit

cell.

Clock

bits

are

written

the

beginning

the

bit

cell,

while

data

bi~s

are

written

the

middle.

Due

predictable

bit-shift-

phenomena,

write

data

may

require

precompensatiori.

This

function

must

provided

the

controller

insure

data

integrity

the

specified

error

rate.

The

Sf-506

requires

precompensation

write

data

cylinders

128

through

152.

The

data

pattern

determines

which

bits

must

precompensated.

The

recommended

amount

this

precompensation

12ns

for

both

early

and

late

written

bits.

All

other

data

patterns

are

written

time.

2.1.2

Track

Format

The

track

format

used

the

Seagate

ST-506

disc

drive

slightly

modified

version

the

IBM

System

double

density

format.

This

format

common

many

industry

standard

floppy

disc

drives.

All

ST-506

drives

are

formatted

the

factory

before

shipping.

Data

fields

contain

the

bit

pattern

UJL

Refer

Figure-2.1

(Track

Format).

The

Seagate

soft-sector

format

divides

each

track

into

sectors

with

each

containing

256

bytes

data.

Total

track

capacity

10416

bytes,

which

8192

bytes

are

data."

Each

sector

identified

identification

field

that

different

than

any

other

the

drive.

The

field

contains

cylinder,

head,

and

sector

information

well

address

ark

and

error

checking

polynomials.

should

noted

that

the

format

used

Seagate

recommended

and

not

required.

Use

any

other

format

requires

careful

evaluation,

the

format

integral

part

the

drives'

performance

and

operation.

The

Seagate

format

uses

Cyclic

Redundancy

Checking

(eRC)

for

error

evaluation.

The

format

also

allows

for

plus

or minus

speed

variation

3%.

The

ST-506

specification

for

spindle

speed

variation

over

the

specified

environmental

and

power

limits.

Seag

ate

Technology

PAGE 4

5/1/82

FIGURIE

TRACK

FORMAl·

SHIPPED

INDEX

----fl

IRepeated

,times

(314

Bytes)

Gap 1

Field

-Gap

----

Data

Fie~d

SYNC

eSC

16X

13XOO

IrI

3xOO

113xoo A

F81

256

Data

'--r

lOAM

Data

GaIP

~I~

C C

3XOO

f15X4E

Gap4

352X

Nominal

-0

c.n

WRITE

UPDATE

NOTES:

1. Nominal Track Capacity =

10416

Bytes .

2. Total Data

Bytes/Track

256

3~~

8,192

lL--' _

3. Sector interleave factor is

SequE!ntiallD Fields are sector numbered

16,24,

1,9,17,25,2,

10,

18,

26,

...

etc.

4. Data Fields contain

the

bit

pattern

0000

as shipped

CRC

Fire Code

=X16+X12+X5+1

Bit

Head Byte ID Field equals 1in adefective sector (Cylinder 0is

orror

free)

Bit

Head Byte reserved

for

nl.lmberingcylinders

greate,"

than

256

Bit

Head Byte reserved

for

nl.lmbering cylinders greater

than

512

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