HP HP 7936 Istruzioni per l'installazione

HEWLETT-PACKARD

liP

7936

AND

7937

DISC

DRIVES

HARDWARE

SUPPORT

MANUAL

CERTIFICATION

Products,

materials,

parts,

and

services

furnished

this

order

have

been

provided

accordance

with

all

applicable

Hewlett-

Packard

specifications.

Actual

inspection

and

test

data

per-

taining

this

order

file

and

available

for

examination.

Hewlett-Packard's

calibration

measurements

are

traceable

the

National

Bureau

Standards

the

extent

allowed

the

Burea

calibration

facilities.

The

Hewlett-Packard

Quality

Program

satisfies

the

require-

ments

FAR 52.246-15.

7936 and

7937 Disc Drives

Hardware Support Manual

Manual part number: 07937-90903

Microfiche part

no.

07937-90803

Printed: JANUARY

1987

Printed in

U.s.A.

MODELS COVERED

Edition 1

E0187

This manual covers the following models: HP 7936H, 7937H,

7936XP, 7937XP.

OPTIONS COVERED

In addition

the standard model, this manual covers the

following options:

015,

017.

r/;O-

HEWLETT

a:~

PACKARD

HEWLETT-PACKARD

P.O.

Box 39, Boise, Idaho 83707-0039

Notice

The

information contained in this document

subject

change without notice.

HEWLETT-PACKARD MAKES NO WARRANTY

ANY KIND

WITH

REGARD

THIS

MATERIAL, INCLUDING, BUT NOT

LIMITED

TO,

THE

IMPLIED

WARRANTIES

MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. HEWLETT-PACKARD shall

not

be liable

for

errors contained herein

for

incidental

consequential damages in connection with

the

furnishing, performance

use

this material.

HEWLETT-PACKARD assumes no responsibility

for

the use

reliability

its software

equipment

that

not

furnished by HEWLETT-PACKARD.

This document contains proprietary information, which

protected by copyright. All rights are reserved.

part

this document may be photocopied, reproduced

translated

another language without the

prior written consent

HEWLETT-PACKARD Company.

1987

by HEWLETT-PACKARD

FOR

U.S.A.

ONLY

The Federal Communications Commission (in 47

CFR

15.818)

has specified

that

the following notice be brought

the attention

the users

this product.

FEDERAL COMMUNICATIONS COMMISSION

RADIO FREQUENCY INTERFERENCE

STATEMENT

Warning: This equipment generates,

uses,

and can radiate radio frequency energy and

not

instal-

led and used in accordance with the instructions manual, may cause interference

radio com-

munications.

has been tested and found

comply with the limits

for

Class A computing devices

pursuant

Subpart J

Part

FCC Rules, which are designed

provide reasonable protec-

tion against such interference when operated in a commercial environment. Operation

this

equipment in a residential area

likely

cause interference in which case

the

user

his

own

ex-

pense will be required

take whatever measures may be required

correct the interference.

Printing History

New editions are complete revisions

the manual. Update packages, which are issued between editions,

contain additional and replacement pages

merged into the manual by the customer. The dates

the

title page change only when a new edition

a new update

published. No information

incorporated

into a reprinting unless it appears

a prior update; the edition does not change when an update

incorporated.

A software code may be printed before the date; this indicates the version level

the software product

the time the manual or update was issued. Many product updates and fixes do not require manual changes

and, conversely, manual corrections may

done without accompanying product changes. Therefore,

not expect a one-to-one correspondence between product updates and manual updates.

Edition 1

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

JANUARY

1987

Herstellerbescheinigung

Hiermit wird bescheinigt,

daB

das Gerat/System HP 7936/7937 in Obereinstimmung mit den Bestimmungen

von Postverfiigung 1046/84 funkentstort

ist.

Der Deutschen Bundespost wurde das Inverkehrbringen dieses Gerates/Systems angezeigt und die

Berechtigung zur Oberpriifung der Serie

auf

Einhaltung der Bestimmungen eingeraumt.

Manufacturer's Declaration

This

certify that the product(s) HP 7936/7937

in accordance with the Radio Interference

Requirements

Directive FTZ 1046/1984. The German Bundespost was notified that this equipment was

put

into circulation; the right

check the series for compliance with the requirements was granted.

Additional Information for Test and Measurement Equipment

Test and Measurement Equipment

operated with unscreened cables and/or used

for

measurements

open setups, the user has

assure that under operating conditions the Radio Interference Limits are still

met

the border

his

premises.

Safety Considerations

GENERAL -This product and related documenta-

tion must be reviewed

for

familiarization with

safety markings and instructions before operation.

SAFETY SYMBOLS

...L..

Instruction manual symbol: the product

will be marked with this symbol when it

necessary

for

the user to refer to the

instruction manual in order to protect

the product against damage.

Indicates hazardous voltages.

Indicates earth (ground) terminal.

WARNING

The WARNING sign denotes a hazard.

calls attention to a procedure

prac-

tice that,

not correctly performed

adhered to, could result in personal in-

jury. Do not proceed beyond a

WARNING sign until the indicated

conditions are fully understood and met.

ICAUTION I

The CAUTION sign denotes a hazard.

It calls attention

an operating proce-

dure

practice that, if not correctly

performed

adhered to, could result

damage

destruction

part

all

the product. Do not proceed beyond

a CAUTION sign until the indicated

conditions are fully understood and met.

SAFETY EARTH GROUND -This

a safety

class I product and

provided with a protective

earthing terminal. An uninterruptible safety earth

ground must be provided from the main power

source to the product input winng terminals,

power cord,

supplied power cord set. Whenever

likely that the protection has been impaired,

the product must be made inoperative and be

secured against any unintended operation.

BEFORE APPLYING

POWER

-Verify

that

the

product

configured

match the available main

power source according

the input power con-

figuration instructions provided in this manual.

this product

to be operated with

autotrans-

former make sure

that

the common terminal

connected to the earth terminal

the main power

source.

SERVICING

WARNING

Any

servlcmg, adjustment, maintenance, or

repair of this product must

performed only

by service-trained personnel.

Adjustments described in this manual may

performed with power supplied to the product

while protective covers are removed. Energy

available

many points may, if contacted,

result

personal injury.

Capacitors inside this product may still

charged

after

the product has been disconnec-

ted from the main power source.

To avoid a fire hazard, fuses with the proper

current rating and of the specified type (nor-

mal

blow,

time delay, etc.) must

used for

replacement. To install or remove a fuse, first

disconnect the power cord from the device.

Then, using a small flat-bladed screw driver,

turn the fuseholder cap counterclockwise until

the cap releases. Install either end of a prop-

erly rated fuse into the cap. Next, insert the

fuse and fuseholder cap into the fuseholder

pressing the cap inward and then turning

clockwise until it locks in place.

List of Effective Pages

The

List

Effective Pages shows the edition

update number

all pages. Within

the

manual, any page

changed since the last edition

indicated by printing the update number

the bottom

the

page.

Changes are marked with a vertical bar in the margin.

an update

incorporated when

edition

reprinted, these bars are removed.

information

incorporated into a reprinting unless it appears as a

prior update.

verify

that

your manual contains the most current information, check

that

the

version

printed

the bottom

the page matches the version listed below

for

that

page.

Effective Pages Version

all

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

Edition 1

Chapter 1

Product Information

Contents

Page

1-1

Introduction

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

1-1

Product Description

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

1-1

Documentation Supplied

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

1-2

Supporting Documentation

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

1-2

Product Structure

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

1-2

Specifications

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

1-2

Serial Number

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

1-2

Supported Eq,uipment

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

1-2

Test Equipment Required

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

1-2

Warranty

...

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

1-2

Support Strategy

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

1-2

Chapter 2

Site Planning and Requirements Page

2-1

Introduction

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

2-1

Site Planning

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

2-1

Specifications

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

2-1

Cabling Limitations

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

2-1

Chapter 3

Installation And Configuration Page

3-1

Introduction

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

3-1

Shipping Latch

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

3-1

Drive Installation

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

3-2

Primary Power Requirements

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

3-2

Controls, Indicators, and Connectors

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

3-2

Line-

Switch

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

3-2

Channel Address/Diagnostic Switch

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

3-2

Run

Time Mode

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

3-3

Diagnostic Mode

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

3-3

LED Display

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

3-4

HP-IB Connector

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

3-4

Power Fuse

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

3-4

Line Connector

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

3-4

CPU Connection -HP-IB Systems

...........

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

3-4

Contents (continued)

HP-IB Cabling

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

3-4

HP-IB Device Address

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

3-5

Chapter 4 Page

4-1

Preventive Maintenance

Introduction

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

4-1

Chapter 5 Page

5-1

Functional Description

Introduction

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

5-1

Block Diagrams

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

5-2

Signal

Notation

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

5-2

List

Mnemonics

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

5-2

Disc

Format

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

5-3

Addressing Structure

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

5-7

Addressing Mode

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

5-7

Disc Sparing

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

5-7

Sector Sparing

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

5-7

Track

Sparing

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

5-8

Controller PCA-A6

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

5-8

Servo System

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

5-11

Head-Disc Assembly A3

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

5-12

Dedicated Servo Code

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

5-12

Sampled Servo Code

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

5-13

Servo Head

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

5-13

Servo Read Preamplifier/Write Driver IC

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

.5-13

Drive ID Circuit

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

5-13

Head Gain Reference PROM and DAC

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

5-14

Actuator

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

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

5-14

Speed Sensor

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

5-14

Read/Write

PCA-A2

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

5-14

Dedicated Servo AGC Amplifier.

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

5-14

Sampled Servo Switch

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

5-15

Sampled Servo AGC Amplifier

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

5-15

Servo PCA-Al

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

5-15

Servo Controller

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

5-15

2-Bit ADC

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

5-16

Dedicated Servo AGC Circuit.

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

5-17

Sampled Servo AGC Circuit

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

5-17

Sector Mark Decoder

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

5-17

Dedicated Servo Circuit

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

5-17

Sampled Servo Circuit

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

5-19

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