HP 7942 Manual de usuario

HEWLETT-PACKARD

7942

AND

7946

DISC/T

APE

DRIVES

SERVICE

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

Bureau's

calibration

facilities.

The

Hewlett-Packard

Quality

Program

satisfies

the

require-

ments

FAR 52.246-15.

rlin-

HEWLETT

.:~

PACKARD

SERVICE

MANUAL

7942

AND

7946

DISC/T

APE DRIVES

Manual

part

no.

07942-90903

Microfiche

part

no.

07942-90803

PRINTED: FEB 1987

Printed in

U.S.A.

Serial Number Prefix

07942-90903

E0287

The main

part

this manual applies directly to

7942

and

7946

Disc/Tape

Drives with serial numbers prefixed

2615

and subsequent.

Refer

to Appendix A

for

serial numbers prefixed

2614

and prior.

OPTIONS COVERED

In addition to the standard models, this manual

covers

the

following options:

5 and 550.

FOR U.S.A. ONLY

The Federal Communications Commission (in 47 CFR 15.838) has specified

that

the

fol-

lowing notice be brought to

the

attention

the users of this product.

FEDERAL COMMUNICATIONS COMMISSION

RADIO FREQUENCY INTERFERENCE

STATEMENT

Warning:

This

equipment

generates

and

uses

radio

frequeucy

energy

and

not

installed

and

used

properly,

that

is,

strict

accordalllce

with

the

manufacturer's

instructions,

may

cause

interference

radio

and

television

reception.

has

been

type

test.~d

and

found

to comply

with

the

limits

for a Class B

computing

disc/tape

drive

accordance

with

the

specifications

Subpart

J of

Part

15 of FCC

Rules,

which

are

designed to provide

reasonable

protection

against

such

interference

ill a

residential

installation.

However,

there

is no

guarantee

that

interference

will

not

occur

par-

ticular

install~ltion.

this

equipment

does

cause

interference

radio

television

reception,

which

can

determined

turning

the

equipment

off

and

on,

the

user

encouraged

try

correct

the

interference

by one

the

fol-

lowing measures:

reorient

the

receiving

antenna;

relocate

the

equipment

with

respect

the

receiver;

move

the

equip-

ment

away

from

the

receiver;

plug

the

equipment

into

different

branch

circuit.

necessary,

the

user

should

consult

the

dealer

3,uthorized field

service

representative

for

additional

suggestions.

The

user

may

find

the

following

booklet

prepared

tllte

Federal

Communications

Commission

helpful:

"How to

Identify

and

Resolve

Radio-TV

Interference

Problems".

This

booklet

available

from

the

U.S.

Government

Printing

Office, WashingtoD,

20402.

Stock

No.

004-000-00345-4.

HEWLETT-PACKARD COMPANY

P.O.

BOX

BOISE,

IDAHO

83707,

U.S.A.

PRINTING HISTORY

New editions incorporate all update material since

the

previous edition. Updating Supplements, which are

is-

sued between editions, contain additional and revised information

be incorporated into

the

manual

the

user. The date on

the

title page changes only when a new edition

published.

First Edition

Second Edition

Third

Edition .

FEB 1985

AUG

1986

FEB 1987

NOTICE

The information contained in this document

subject to change

without

notice.

HEWLETT-PACKARD

MAKES NO

WARRANTY

OF ANY KIND WITH

REGARD

TO THIS

MATERIAL,

INCLUDING, BUT NOT LIMITED TO,

THE

IMPLIED WARRANTIES OF

MERCHANTABILITY AND FITNESS FOR A

PARTICULAR

PURPOSE.

Hewlett-Packard

shall not be

liable for errors contained herein

for incidental or consequential damages in connection

with

the

furnish-

ing, performance

use of this material.

This document contains proprietary

information

which

protected by copyright. All rights are reserved. No

part

this document may be photocopied

reproduced

without

the

prior

written

consent of

Hewlett-Packard

Company.

COREFILE-PARCORE

PREFACEI

This publication provides field service

information

for the

7942

and

7946 Disc/Tape Drives. The

7942

consists of a

24-megabyte

disc drive and a tape drive combined in a single desktop cabinet to form

integrated

disc/tape

drive. The

7946 consists of a

55-megabyte

disc drive and a tape drive combined

in a similar manner.

This publication

divided into

the

following parts:

• Section I - Contains a general description of

the

disc/tape

drive.

• Section

-Provides references to

the

CS/80

Instruction Set commands applicable to

the

disc/tape

drive.

• Section

III

Describes the operating principles of

the

disc/tape

drive.

• Section

Contains servicing

information

for

the

disc/tape

drive.

• Section V - Supplies

step-by-step

removal and replacement procedures for field replaceable assemblies

and parts in the

disc/tape

drive.

• Section

Lists and illustrates

the

field replaceable assemblies and parts in

the

disc/tape

drive.

• Appendix

A-Contains

removal

and

replacement and relaceable parts for

disc/tape

drives

with

serial

number

prefix

2614

and prior.

• Tape Drive -Consists of a Tape Drive Service Manual. This

manual

provides detailed service

informa-

tion

for

the

tape drive portion of

the

disc/tape

drive.

iii/iv

Section

GENERAL

INFORMATION

Introduction

Documentation

Manuals

Options

act

eri st

Section

CHANNEL

INTERFACE

Introduction

......

CS/80

Instruction

Set

Transaction

Structure

Real

Time

Commands

Complementary

Commands

General Purpose

Commands

Diagnostic

Commands

Transparent

Messages .

Hewlett-Packard

Interface

Bus

HP-IB Communications

Channel Management

Paralll~l

Poll

Universal

Device

Clear

Message

Structure

Section

III

THEOR

Y OF

OPERATION

Introduction

Disc

Drive

Introduction

Disc Format

........

HOC

peA-AS

.........

HOC

Internal

Bus

Architecture

HP-IB Data

Bus

........

RAM

Data

Bus

Microprocessor

Address

Bus

Microprocessor

Data

Bus

DMA

Gate Array Data

Bus

Read/Write Data

Bus

Data/Control

Interface

Bus

Control/Status

Data

Bus

Control/Status

Read

Strobe

Control/Status

Write

Strobe

CONTENTS

Page

1-1

1-2

Page

2-1

2-9

2-12

2-13

Page

3-1

3-2

3-4

3-6

3-7

3-8

CONTENTS (continued)

Control/Status

Address

Bus

Select

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

Read/Write

Data

Bus

Data

Request

In/Data

Request

Out

......

robe

In/Da

robe

........

HP-IB

Interface

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

Microprocessor

.....

HP-IB

Address

Switch

Channel

Status

...

Sel

f Tes t Swi

tches

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

Self

Test

Display

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

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

DMA

Array

IC . . . . . . . . . . . . . . . . . . . . . .

.....

RAM

...........

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

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

EXEC

EPROM

. . . .

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

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

DOC

EPROM

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

DOC

1 E

PROM

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

, . . . . .

Address

Multiplexer

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

Clocks

And

Control

Logic

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

ROM

i t ch . . . . . . . . . . . . . . . _. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Buffers

Typical

HOC

Transaction

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

DOC

PCA-A2

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

HOC/DOC

Commu

cat

ion

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

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

Control/Status

Data

and

Address

Buses

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

Read/Wri

Data

Bus

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

Receiver/Driver

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

Transceivers

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

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

DOC/Disc

Drive

Communication

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

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

Controller

IC and

Decode Logic

.......

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

HDA

Desc r

ipt

ion

PROM

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

Self-Test

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

.........

GPC

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

DOC

Err

0 rs

Reg

i s t er

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

PUPO

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

.....

Disc

Controller

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

.........

Phase-

Loc

ked

Loop

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

Latch

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

DMA

Handshake Cont

rol

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

Clock

Generator

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

Write

Precompensation

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

Disc

Drive

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

Disc

Drive

A1/DDC

Control

Communication

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

Input

Buffers

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

Output

Drivers

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

Disc

Drive

A1/DDC

Data

Communication

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

Microprocessor

and

PLA

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

Microprocessor/PLA

Control

Signals

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

Clock

Generator

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

Head-Disc

Module

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

3-8

3-9

....

,3-10

3-10

3-11

3-12

3-13

3-14

3-15

Actuator

.....

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

3-15

Recording

Medium

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

Read/Wri

Heads

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

Read

Preamplifier/Write

Driver

Servo

Head

........

Servo

Preamplifier

Spindle

Moto

......

Air

Filtration

Components

Actuator

Lock

Driver

Spindle

Speed

Control

Spindle

Speed Checker

Spindle

Motor Brake Relay and Relay

Driver

Actuator

Servo

Control

Demodu

.....

Mode

Select

Switch

Seek

~Iode

Velocity

DAC

Tachometer

Slclpe

Selector

Current

Inverter

On-Peak

Detector

Power

Amplifier

Inverter

.....

Track--Follow

Mode

Off-Track

Detector

Seek Operation

Restore

Track 0 Operation

Read/Wri

t.e

Data Channel

.....

Head

SelE!ct and

Control

Logic .

Read

Chain

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

Ampli f

ier/Signal

Condi

tioner

Differential

Line

Driver

Wri

Chain

........

Line Receiver

....

Transition

Generator

Write

Current

Source

Write

Fault

Detector

Sel

test

......

Power Supph'

Input

Circuits

Swi

tch-Mc)de

Supply

Power-On Reset

....

Section

SERVICE

INI4'ORMATION

Introduction

Service

Tools

FRA

Locations

CONTENTS (continued)

3-15

3-16

3-17

3-18

3-19

3~19

3-19

3-20

3-21

3-22

Page

4-1

4-2

vii

CONTENTS (continued)

Cable Connections

Signal

Distribution

Power

Distribution

Signal

Notation

Block Diagram

Power Supply

HDC

PCA-AS

...

Self

Test

....

Self-Test

Controls

Tape Drive

FAULT

Indicator

Tape Drive

BUSY

Indicator

Disc Drive

FAULT/ON

LINE

Indicator

1f T

est

i tch

....

Self-Test

Display

DISPLAY

RESULTS

Switch

Internal

Diagnostics

Sel

f Test

...........

Self-Test

Subtests

Self-Test

Error

Reporting

Fault/On Line

Indicator

Self-Test

Display

...

Request

Status

.....

Request

Status

Example

Run

Time

Error

and

Fault

Reporting

External

Exerciser

........

Amigo

Clear

(AMCLEAR)

Cancel

Transaction

(CANCEL)

Test

HP-IB

Channel

(CHANNEL)

Channel Independent

Clear

(CICLEAR)

Clear

Logs

(CLEAR

LOGS)

........

Describe

Selected

Unit

(DESCRIBE)

Perform

Internal

Diagnostics

(DIAG)

Output

Error

Rate

Test

Log

(ERT

LOG)

Exit

Program

(EXIT)

.......

Output

Fault

Log

(FAULT

LOG)

Output Help

Information

(HELP)

Initialize

Media (INIT

MEDIA)

Update Device

Logs

(PRESET)

Request

Status

(REQSTAT)

....

Perform Read-Only

Error

Rate

Test

(RO

ERT)

Output

Run

Log

(RUN

LOG)

.....

Spare

Sector

(SPARE)

........

Output Spare Table

(SPARE

TABLE)

Output Device Table

(TABLES)

Perform Servo

Test

(SERVO)

Set

Unit

Number

(UNIT)

......

Perform Write-Then-Read

Error

Rate

Test

(WRT

ERT)

Troubleshooting

Disc Drive Maintenance

Tape Drive Maintenance .

viii

4-2

4-3

4-4

4-5

4-S

4-6

4-7

4-8

4-9

4-10

-11

4-11

-11

4-11

-11

4-11

4-12

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