HP Pavilion 743 How to use

Service Handbook
HP 9000 Series 700 Model 743
HP Part No. A2636-90604
Edition E1097
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ii
Hewlett-Packard Co. 1997
Printing History
First Printing: October 1997
UNIX is a registered trademark in the United States and other countries, licensed exclu-
sively through X/Open Company Limited.
NOTICE
The information contained in this document is 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 WAR-
RANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PUR-
POSE. Hewlett-Packard shall not be liable for errors contained herein or for incidental or
consequential damages in connection with the furnishing, performance or use of this mate-
rial.
Hewlett-Packard assumes no responsibility for the use or reliability of its software on
equipment that is not furnished by Hewlett-Packard.
This document contains proprietary information that is protected by copyright. All rights
reserved. No part of this document may be photocopied, reproduced or translated to
another language without the prior written consent of Hewlett-Packard Company.
RESTRICTED RIGHTS LEGEND. Use, duplication, or disclosure by government is sub-
ject to restrictions as set forth in subdivision (c) (1) (ii) of the Rights in Technical Data and
Computer Software Clause at DFARS 252.227.7013. Hewlett-Packard Co., 3000 Hanover
St., Palo Alto, CA 94304.
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Safety and Regulatory Statements
iii
Safety and Regulatory Statements
Safety
For safety information see the owner’s guide that came with the system in
which you are installing your Model 743 board computer.
Regulatory Statements
Emissions Regulations
Federal Communications Commission (FCC) This equipment has
been tested and found to comply with the limits for a Class A digital
device, pursuant to part 15 of the FCC Rules and interference causing reg-
ulations of Industry Canada. These limits are designed to provide reason-
able protection against harmful interference in a non-residential
installation. This equipment generates, uses, and can radiate radio fre-
quency energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a partic-
ular installation. If this equipment does cause harmful interference to
radio or television reception (determined by turning the equipment off
and on), you can correct the interference by one or more of the following
measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and the receiver.
• Connect the equipment to an outlet on a circuit different from that to which the
receiver is connected.
Hewlett-Packard’s system certification tests were conducted with HP-sup-
ported peripheral devices and HP shielded cables, such as those you
receive with your computer. Changes or modifications not expressly
approved by Hewlett-Packard could void the user’s authority to operate
the equipment.

Safety and Regulatory Statements
iv
Australia EMC Standards
This equipment has applied for and received approval to display the Aus-
tralian C-Tick mark according to the standards of AS/NZS 2064.1/2:1992
and AS/NZS 3548:1995.
VCCI Class A ITE

Electrostatic Discharge (ESD) Precautions
v
Electrostatic Discharge (ESD) Precautions
Electrostatic charges can damage the integrated circuits on printed circuit
boards. To prevent such damage from occurring, observe the following
precautions during board unpacking, installation, and configuration:
• Stand on a static-free mat.
• Wear a static strap to ensure that any accumulated electrostatic charge
is discharged from your body to ground.
• Connect all equipment together, including the static-free mat, static
strap, routing nodes, and peripheral units.
• Keep uninstalled printed circuit boards in their protective antistatic
bags.
• Handle printed circuit boards by their edges, once you have removed
them from their protective antistatic bags.

Electrostatic Discharge (ESD) Precautions
vi

Contents
vii
Preface
Safety and Regulatory Statements iii
Safety iii
Regulatory Statements iii
Emissions Regulations iii
Australia EMC Standards iv
VCCI Class A ITE iv
Electrostatic Discharge (ESD) Precautions v
1 Product Information
Product Description 1-2
Technical Information 1-6
Electrical 1-6
Regulatory Compliances 1-7
Environmental Requirements 1-7
Hardware Support 1-9
Field Repair Philosophy 1-9
Additional Technical Information 1-9
Schematics 1-9
Supported Products 1-10
Accessory Cards 1-11
Typical External Devices 1-12
Cables 1-12

Contents
viii
Keyboard and Mouse 1-13
Repair Services 1-14
2 Functional Description
Overview 2-2
System Board 2-2
CPU Circuit 2-4
Boot ROM Circuit 2-4
System Failure LED 2-5
Power LED 2-5
Graphics Circuit 2-6
Keyboard 2-7
Memory Controller Circuit 2-7
Memory Map 2-8
I/O Controller ASIC 2-10
Built-in Interfaces 2-11
Audio 2-11
HP Parallel 2-13
RS-232 Ports 2-14
AUI LAN 2-16
SCSI 2-17
PS/2 Ports 1 and 0 2-19
VME Controller ASIC 2-20
Graphics Accessory Cards 2-23
RAM Cards 2-24
Interval Timers 2-26

Contents
ix
Watchdog Timer 2-26
Power Distribution 2-27
3 Configuration
Introduction 3-2
Boot Console Handler 3-3
Overview of the Boot Console Handler 3-3
Using the Boot Console Handler 3-4
Boot From a Device Menu 3-7
Path Configuration Menu 3-9
Primary or Alternate Path Menus 3-10
Console Path Menu 3-10
Keyboard Path Menu 3-11
Mode Configuration Menu 3-12
Setting Values in the Mode Configuration Menu 3-13
Mode Configuration Menu Selections 3-14
Boot Search Control 3-14
Console Search Control 3-15
Keyboard Search Control 3-15
Test Configuration 3-15
Control Flags 3-16
Interactive Testing 3-18
Interactive Testing Limitations 3-19

Contents
x
Accessing Firmware Information 3-21
Hardware Information 3-23
ASIC Hardware Component Information 3-25
Graphics Information 3-26
System Configuration Menu 3-27
Graphics Configuration 3-29
Graphics Information in Menus 3-29
4 Troubleshooting
Introduction to Troubleshooting 4-2
Diagnostic Overview 4-2
ISL Environment 4-3
Boot ROM Selftests 4-4
Hardware Initialization Support 4-5
Go/No-Go Selftest Support 4-5
Failure Indications 4-5
Early Selftest 4-6
Read/Write Memory Test 4-6
Read-Only Memory Test 4-6
Late Selftest 4-6
Extended Selftest 4-6
Firmware Selftest Failures 4-8
Interpreting the Front Panel LEDs 4-8