HP 9130K Manual de usuario

~===========

SERVICE

MANUAL

HP 9130K

Flexible

Disc

Drive

Service Documentation

Hewlett-Packard Greeley Division

3404 East Harmony Road, Fort Collins, Colorado 80525

Table of Contents

Chapter

General

Information

Introduction

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

1-1

General Description

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

1-1

Available Options

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

1-2

Environmental

and

Physical Specifications

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

1-2

Recording Specifications

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

1-2

Environmental Specifications

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

1-2

Physical Dimensions

and

Weight

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

1-3

Performance Specifications

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

1-3

Flexible Disc Media Use

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

1-4

Intro.duction

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

1-4

Operating Cleanliness

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

1-5

Handling Discs

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

1-5

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

1-6

Don't

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

1-7

Write Protection

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

1-9

Chapter

Interface

Information

Introduction

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

2-1

Interface

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

2-1

Primary Power Requirements

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

2-1

Signal Line Description

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

2-3

Input Control Lines

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

2-3

Output

Status Lines

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

2-4

Typical Interface Drive/Receiver Circuit

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

2-8

Chapter

Theory

Operation

Introduction

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

3-1

Flexible Disc Recording Fundamentals

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

3-1

Index Pulse

Shaping

Network

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

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

3-3

Write Protect

Sensor

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

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

3-3

Track 0 Switch

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

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

3-3

Spindle Motor Drive Control

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

3-3

Head

Position Control

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

3-4

Power

Circuit

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

3-4

Data Circuitry

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

3-4

Writing Data

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

3-4

Reading Data

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

3-7

iii

Chapter

Assembly

Access

Introduction

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

4-1

Chapter

Maintenance

Introduction

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

5-1

Service

Kit

Contents

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

5-1

Drive Failure Analysis

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

5-2

Head

Cleaning

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

....

5-3

Termination Resistor

U2F

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

5-3

Shunt

Block U1E

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

5-3

Alignment

and

Adjustments

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

5-3

Introduction

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

....

5-3

Spindle Motor

Speed

Adjustment

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

....

5-3

Spindle Drive Belt Adjustment

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

5-4

Radial

Head

Alignment

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

5-7

Head

Azimuth Alignment

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

5-8

Track 0 Switch Adjustment

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

5-9

Index Emitter/Detector Adjustment

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

5-10

Write Protect Switch Adjustment

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

5-12

Read/Write Test

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

5-12

DSU Controls

and

Indicators

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

5-13

Disc Service Unit Operation

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

5-16

Packaging Instructions

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

5-17

Test Point Location

and

Waveforms

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

5-19

Chapter

Schematic

Diagrams

Introduction

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

6-1

Chapter

Replaceable

Parts

Introduction

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

7-1

Figures

1-1 Physical Dimensions

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

1-4

1-2 Head/Media Critical Requirements

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

1-6

1-3 Damaged Media

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

1-8

1-4 Loading the Disc

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

1-9

1-5 Write Protect Tab Installation

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

1-9

2-1

Connector

Pin Out

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

2-1

2-2

Connector

Pin Out (Circuit Side)

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

2-2

2-3 General Control

and

Data Requirements

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

2-5

2-4

Connector

Location

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

2-6

2-5

Connector

Pin Out

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

2-6

Connector

Out

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

2-7

2-7 Servo Electronics Board

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

2-8

2-8 Typical Interface DriverlReceiver Circuit

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

2-9

3-1

and

Data Field

Content

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

3-1

3-2 Media

Sector

and

Track Structure

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

3-2

3-3

Head

Positioning Assembly

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

3-3

3-4

9130K Functional Block Diagram

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

3-5

3-5 Write Timing Diagram

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

3-6

Read Timing Diagram

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

3-7

4-1 9130K Flexible Disc Drive Exploded View

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

4-2

4-2 Drive Board

and

Servo Board Removal

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

4-3

4-3 Front Panel

and

Latch Removal

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

4-4

5-1 Spindle Motor

Speed

Adjustment

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

5-4

5-2 Spindle Drive Belt Adjustment

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

5-5

5-3 9130K Test

Setup

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

5-6

5-4

Radial

Head

Alignment Waveform

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

5-7

5-5

Head

Assembly Retaining Screws

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

5-8

5-6

Head

Azimuth Waveform

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

5-9

5-7 Track 0 Switch Retaining Screw

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

5-9

5-8

Track 0 Waveform

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

5-10

5-9 Index Detector Retaining Screw

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

5-11

5-10

Index to Burst Waveform

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

5-12

5-11 Write

Waveform

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

5-13

5-12

Write 2F Waveform

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

5-13

DSU Controls

and

Indicators

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

5-14

5-14 9130K/DSU Test

Setup

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

5-16

5-15

Foam Latch Insert

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

5-17

5-16

Inner Box

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

5-18

5-17

Foam End Caps

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

5-18

Outer

Box

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

5-19

Test Point Locations (09130-66501)

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

5-19

5-20

Test Point Locations (82901-66515)

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

5-20

6-1 Drive Electronics Board PIN

09130-66501

Schematic Diagram

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

6-3

6-2 Drive Electronics Board PIN

82901-66515

Schematic Diagram

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

6-5

6-3 Servo Electronics Board PIN

09130-66500

Schematic Diagram

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

6-9

6-4

Servo Electronics Board

Component

Locator

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

6-11

6-5 Drive Board PIN

82901-66515

Component

Locator

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

6-12

6-6 Drive Board PIN

09130-66501

Component

Locator

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

6-13

Chapter 1

General Information

Introduction

This service

manual

provides detailed information for servicing

the

9130K

disc drive.

Service

Philosophy

The

9130K

Flexible Disc Drive

comprised of

three

serviceable areas:

the

mechanical drive

assembly,

the

drive electronics assembly

and

the

servo electronics assembly.

All

assemblies

are

serviced

the

exchange

program

with

the

exception of

some

parts

the

mechanical

assembly.

The

field replaceable parts are outlined in

the

maintenance

and

assembly access

sections.

General Description

The

9130K

rnini

double

sided flexible disc drive

semi-random

access mass

storage

system employing a flexible magnetic medium.

consists of a mini disc drive, a

servo

electronics circuit

board

and

a drive electronics circuit board.

Each drive

module

contains all

the

mechanical parts necessary for physically handling

the

disc.

These

include

the

drive spindle

and

motor, 2

heads

each

having read/write

and

erase

capability, write

protect

sensor, track 0 sensor, index sensor,

and

activity LED

the

front

panel. Each drive

module

also contains a servo control

board

which controls

the

DC drive

motor

speed

and

a drive electronics

board

which interprets

and

generate

control signals,

controls

movement

the

read/write

head

the

correct position,

and

also

reads

and

writes

data.

The

flexible magnetic

medium

used

the

9130K

called a flexible disc.

The

flexible disc

measures

133.4

(5.25 inches)

a side

and

has a

3.8

cm (1.5 inch) hole for alignment

the disc drive spindle.

The

disc

enclosed in a protective polyvinylchloride (PVC) jacket

with a slot for access to

the

recording surface. Both sides of

the

flexible disc are

used

for

data

storage.

The

recording

head

the

drive

module

positioned by a mechanism driven by a

stepper

motor

and

taut

metal

band.

The

head

positioning mechanism

operates

open

loop

configuration,

that

is,

there

feedback to the drive electronics

board

determine

the

actual position of

the

head.

The

heads

are

mechanically

coupled

the

door

mechanism so

that

closing of

the

door

causes

the

heads

make

contact

with

the

media.

1-2

General

Information

Available

Options

The

following

options

are

available with

the

9130K flexible disc drive:

Option

#010

This

option

consists of drive

board

PIN 09130-66501.

Option

#011

This

option

consists of drive

board

PIN 82901-60015

found

the

8290X series drives.

Option

#050

This

option

consists of

the

mechanical

drive assembly with

servo

board

and

front

panel

4040-1838

and

latch PIN 4040-1836

and

associated hardware.

Option

#051

This

option

consists of

the

mechanical

drive assembly with

servo

board

and

front

panel

4040-1915

and

grey latch PIN 4040-1914

and

associated hardware.

Option

#052

This

option

consists of

the

mechanical drive assembly with servo

board

and

front

panel

4040-1915

and

brown

latch PIN 4040-1913

and

associated hardware.

Environmental

and

Physical

Specifications

Recording

Specifications

Physical

Track

Format

Recordng

Mode: Modified

Frequency

Modulated

(MFM)

Rotational

Speed:

300 RPM ± 1.5%

(±

4.5 RPM)

Bit Density: 5456 BPI Track 34

Tracks

Per

Inch: 48

Sides

Per

Disc: 2

Tracks

Per

Side: 35

Sectors

Per

Track: 16

Bytes

Per

Sector: 256 (362 including

overhead

bytes)

Bytes

Per

Disc: 286,720 (formatted) 420,000 (unformatted)

Transfer

Rate

164,000 bits

per

second

nominal

burst

rate.

Access

Time

Track

Seek:

5 msec. max.

Head

Settling Time: 15 msec. max.

Spindle

Motor

Start

Time: 250 msec. max.

Environmental

Specifications

Operating

Limits

Temperature:

+100e to +44°e (50° F to 111.2°

General

Information

1-3

Relative Humidity:

20%

80%

with

maximum

wet

bulb

temperature

not

exceed

29.4°C

(85°

Altitude: 0

4572M

(0 to

15000

feet)

Storage

Limits

Temperature:

° C to 71° C (-

40.5°

F to

159.8°

Relative Humidity:

20%

80%

with

maximum

wet

bulb

temperature

not

exceed

29.4°

(85°

Alignment Limits

Radial Alignment: 1.1 mils

maximum

of track

center

track

measured

20° C (68°

and

50%

humidity.

Azimuth: 18°

maximum

clockwise

counterclockwise

tracks

and

34.

Power

Requirements: +12VDC ± 0.6V @

900ma

nominal

+5VDC ±

0.25V

600ma

nominal

Media Life

Revolutions

2,500,000

revolutions

any

track.

Head

Life: More

than

15,000

hours

operation

with

media.

Physical

Dimensions

and Weight

Figure 1-1 illustrates

the

physical dimensions.

Weight:

2.04Kg

(4.5 lbs)

Height:

85.85mm

(3.38

inches)

Width:

149.1mm

(5.87

inches)

Length:

203.2mm

(8 inches)

Performance

Specifications

Soft

Read

Errors: 1 in

9 bits

read

inner

most

track

Seek

Errors: 1 in

seeks

See

the

9130K

Specification

Document

for further details.

"Hard

Error"

defined

error

that

cannot

recovered

from using

approved

retry

scheme.

1-4

General

Information

8.37

(212.72)

~-----(l~~6)---

3.12

(79.37)

1.37

(34.92)

SEE

NOTE

*1.87*

*(47.62)*

14--------

6.12(155.57)

~===~=====::::~~

*5.87(149.22)*

14---

337

(85.72)

NOTES:

DIMENSIONS

GIVEN

INCHES(MILLIMETRES).

DENOTES

DIFFERING

TANDON

DRIVE

DIMENSIONS.

THIS

DIMENSION

FROM

BACK

FACEPLATE.

Figure 1-1:

9130K

Physical Dimensions

Flexible

Disc

Media

Use

Introduction

The

storage

medium

used

in the

9130K

disc drive,

a flexible disc commonly called a

floppy. The flexible disc

measures

133.4

mm (5.25 inches) in diameter

and

has a

27.5

(1.125 inch) hole for alignment

the

disc drive spindle. The disc

enclosed in a protective

plastic jacket with a slot for

head

access to the recording surface. Both sides of

the

flexible

disc

are

used

for

data

storage.

using flexible discs indentified as

"double-sided",

.25

megabytes of

data

can

stored

each

disc. Since

some

of the storage

used

in subsystem

overhead,

the

exact

amount

available for user storage

depends

upon

the controller subsystem. Refer to

the

appropriate

mainframe programming

reference manual for details. Double-sided flexible

discs (HP

part

number

92190A,

package

of ten) are available from

HP's

computer

supplies

catalog, by calling

the

toll free

order

number

800-538-8787.

Each flexible disc must

initialized before it

can

used

for

data

storage.

The

initialization

procedure

marks

each

disc track, checks for defective tracks,

and

may establish file director-

ies. Refer to

the

mainframe programming

reference manual for correct procedures.

General Information 1-5

CAUTION

ONLY HP

MEDIA

APPROVED FOR USE

THE 9130K

FLEXIBLE DISC

DRIVE.

USE OF OTHER

MEDIA

MAY

RESULT

PREMATURE DISC FAILURE OR

DAMAGE

TO THE

DRIVE.

MEDIA

WILL

ALWAYS

HAVE

AN/HP

LABEL

IT.

HP RIGOROUSLY TESTS EACH BATCH OF

MEDIA

FOR

ERROR

RATE

AND

WEAR

PERFORMANCE

ADDITION TO

INITIAL

VENDOR QUALIFICATION.

ONLY

THIS

WAY

CAN

HP ASSURE RELIABLE

MEDIA

PERFORMANCE.

THE USE OF NON-HP

MEDIA

FOR SINGLE USE APPLICA-

TlONS SUCH

DATA

INTERCHANGE WILL PROBABLY

NOT

DAMAGE

THE

DRIVE

MEDIA

BUT,

EXTENDED

USE

ANTICIPATED, THE

DATA

MUST

TRANSFERRED

TO HP

MEDIA.

EXTENDED USE OF NON-HP APPROVED

MEDIA

WILL

VOID

WARRANTY

AND

SERVICE CONTRACTS

THE INSTRU-

MENTS.

Operating

Cleanliness

prevent

potential

damage

data

loss, it is

extremely

important

maintain

the

cleanli-

ness

the

disc

and

air within

the

disc drive.

The

disc drive

should

not

operated

environment

in which dust,

smoke,

moisture, oil

chemical

vapor

other

foreign

matter

are

present.

Also,

sure

strictly follow

the

disc

handling

gUidelines.

The

critical

elements

involved in

the

read/write

process

are

shown

in Figure 1-2.

The

read/write

heads

must

maintain

contact

with

the

media

during

the

read

and

write

opera-

tions. Also

shown

are

various

types

contaminants

and

their size relationships. A

contami-

nant

particle.

hard

enough

and

the

right size

may

scratch

either

the

oxide

coating

the

disc

the

head

surface. Even

the

particle is

not

hard

enough

scratch, it

may

hard

enough

lift the

head

from

the

disc

surface

and

cause

data

errors.

Handling

Discs

The

flexible disc

basically

maintenance

free,

but

delicate

and

MUST BE HANDLED

CAREFULLY.

Remember,

the

disc

contains

your

valuable

data

and

programs

and

should

treated

accordingly. A

good

rule of

thumb

treat

the

disc

you

would

valuable

record

album.

Here

are

some

specific

DO's

and

DON'Ts

avoid

loss of

data

damage

the

discs.

EVEN A LITTLE

CARELESSNESS

DISC HANDLING CAN DRAMATICALLY REDUCE

THE LIFE

THE

DISC.

1-6 Generallnformation

100

II:

win

r--

r-I'-o

Relative Read Signal Strength

Head Separation From

The Media Surface

\ \

Head To Media Distance

(winches)

100W

in 1000

win

I\.

,,~

........

"'t--

1 t

~:;;;~.;~.~.

..-AO

Smoke Finger Dust Hair

Particle Print Particle

10.0001'-in

Figure

1-2:

Head/Media

Critical

Requirements

Backup

Disc

Frequently

There

always a chance'of losing

data

when

mass

storage

devices

are

accessed.

There

are

many

causes

any

computer

system-a

programming

bug,

operator

error,

power

failure,

hardware

failure. In

the

case

of flexible discs,

another

mode

possible-media

failure

from

contamination

wearout.

YOUR ONLY PROTECTION AGAINST DATA

LOSS

FREQUENT BACKUP

DATA FILES.

Return

Disc

Storage

Envelope

when

Not

Use

This

the

single

most

important

thing to

remember

about

handling a disc

because

prolongs

disc life by protecting it from

dust

and

scratches. Be-

tween

uses

discs

should

stored

upright in a

dust

free container.

The

box

that

the

discs

are

shipped

in,

a similar container,

good

choice.

Operate

in a

Clean

Environment

Airborne

contaminants

and

particles accidentally

dropped

onto

the

disc

will

cause

the

disc to

wear

out

prematurely

and

may

cause

unreliable

data

storage

and

retrieval

operations.

Some

the

most

common

contaminants

are

DUST, SMOKE, ASHES

and

ERASER PARTICLES. Chemical

vapors

may

also

cause

premature

wearout.

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