Shugart SA800 Manuel utilisateur

A0/801

Disket

Storag

ive

Cf2)

1977

Shugart

Associates

SA800/80l

Diskette

Storage

Drive

C?2J

I I

.J'J®ShUgart

Associates

TABLE

CONTENTS

Section

Maintenance

Features

Page

Diagnostic

Techniques

Preventive

Maintenance.

Removals

Adjustments

Physical

Locations

. .

SA809

Exerciser

Connections

SA800/801

PCB

Component

Locations

SA800/801

Logic

Manual.

. .

SA800/801

Schematic

Diagrams

1.0

MAINTENANCE

FEATURES

1.1 Alignment Diskette

The SA120 Alignment Diskette

used for align-

ment

the

SA800/80l.

The following adjust-

ments can be made using the SA120.

R/W Head radial alignment using track 38.

2. R/W Head azimuth alignment using track 76.

3. Index Photo-Detector Adjustment using tracks

and 76.

4. Track 00

recorded with standard

IBM

3740

format.

75 has

signal for load pad adjustment.

Caution should be exercised in using the SA120

Alignment Diskette. Tracks

00,

01,36,37,38,39,

40, 75, and 76 should

not

be written on. To do

will destroy pre-recorded tracks.

1.2 SA809 Exerciser

The SA809 Exerciser

built

PCB

whose

dimensions are

8".

The Exerciser

PCB

can be

used in astand alone mode or it can be built into

atest station or used in atester for field service.

The Exerciser is designed

enable the user

make

all

adjustments and check outs required on

the

SA800/80l

drives, when used with the SA120

alignment diskette.

The exerciser has no intelligent data handling

capabilities

but

can write

both

and

frequen-

cies. The exerciser can enable read in the drive

allow checking

read back signals.

Refer

Section 6for illustration.

1.3

Special

Tools

The following special tools are available for

performing maintenance on the SA800/80

Description

AlignmentDiskette

Cartridge Guide Adj. Tool

Head Penetration Gauge

Load Bail Gauge

Exerciser

Spanner Wrench

Part Number

SA120-1

50377-1

50380-0

50391-0

50619-0

50752-0

2.0 DIAGNOSTIC TECHNIQUES

2.1 Introduction

Incorrect operating procedures, faulty program-

ming, damaged diskettes, and

"soft

errors" created

by airborne contaminants, random electrical noise,

and other external causes can produce errors

falsely

attributed

drive failure or misadjustment.

Unless visual inspection

the drive discloses

obvious misalignment or

broken

part,

attempt

repeat the fault with the original diskette, then

attempt

duplicate fault

second diskette.

2.2

"Soft Error" Detection

and

Correction

Soft errors are usually caused by:

Airborne contaminants

that

pass between the

read/write

head

and

the disk. Usually these

contaminants can be removed

the cartridge

self-cleaning wiper.

2. Random electrical noise

that

usually lasts for a

few

f.1

sec.

3. Small defects in the written data

and/or

track

not

detected during the write operation

that

may cause asoft error during aread.

4. Worn or defective load pad.

The following procedures are recommended

recover from the above mentioned soft errors:

Reread the track

ten

(10)

times or until such

time

the

data

recovered.

data

not

recovered after using step

access

the head

the adjacent track in the same

direction previously moved,

then

return

the

desired track.

3. Repeat step

data

not

recovered, the error

not

recoverable.

2.3 Write Error

an error occurs during awrite operation, it will

be detected on the next revolution

doing aread

operation, commonly called a"write check." To

correct the error, another write and write check

operation must be done.

the write operation

not

successful after ten

(10)

attempts

have been

made, aread operation should be

attempted

another track

determine

the media or the

drive

failing. If the error still persists the diskette

2.6 Test Points--800/801

should be replaced

and

the above

procedure

repeated.

the failure still exists, consider

the

drive defective.

the failure disappears, consider

the

original diskette defective and discard it.

2.4

Read

Error

Most errors

that

occur

will be

"soft"

errors.

In these cases, performing an error recovery

procedure

will recover

the

data.

2.5 Seek

Error

Stepper

malfunction.

Improper

carriage

torque.

recover from aseek

error

recalibrate

track

and

perform

another

seek

the original track.

TP 1

Read

Data

Signal

Read Data Signal

Read Data (Differentiated)

Signal

Ground

Signal

Ground

Signal

Ground

Index

Head

Load

Index

and 801 Sector Pulses

+Read Data

-Data Separator Time +1

Data

Separator Time +2

+Write

Protect

Detect

Track 00.

Gated

Step Pulses

2.7Test Point Locations

•

•J5 10

•

7J2

26 0

012 A

J6CD

•

49 0

0 0

24 2 1

0010

6J3

04350

000

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