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HP 9020 User Manual

HP 9020
242 pages
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HP
9000
Series
500
Computers
Model
520
HP
9020
Service Manual
Flin-
HEWLETT
a:~
PACKARD

Table of Contents

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HP 9020 Specifications

General IconGeneral
BrandHP
Model9020
CategoryDesktop
LanguageEnglish

Summary

General Information

Warnings, Cautions, and Notes

Explains the meaning of warning, caution, and note indicators used in the manual.

Repair Philosophy

Outlines the strategy for computer repair at the assembly replacement level.

Ac Components/Voltage Conversion

Covers AC power input, voltage conversion, and related components.

Safety

Provides essential safety guidelines for working with computer hardware.

Theory of Operation

Supervisor Board

Covers the supervisor board's monitoring and control functions.

Processor Stack

Describes the processor stack's architecture and function.

Stack Configurations

Details the rules for configuring boards within the processor stack.

Stack Boards

Describes the types and functions of boards used in the processor stack.

Memory

Discusses memory organization, error detection, and mapping.

IOP Bus

Explains the function and structure of the IOP bus.

Keyboard

Details the keyboard's components and operation.

Keyboard and Input Device Scanning

Explains how the keyboard scans keys and handles input.

98770A and 98780A Display Interface Module (DIM)

Describes the DIM's function in interfacing displays to the IOP bus.

98760A Standard Color Graphics Display

Explains the operation of the 98760A display.

Thermal Printer

Describes the printer's components and operation.

Printer Operation

Explains how the printer operates to produce output.

Mass Storage

Discusses the flexible and fixed disc drives.

Testing and Troubleshooting

Troubleshooting and Repair Strategy

Outlines the approach to diagnosing and repairing failing computers.

Problem Isolation

Provides initial steps to isolate problems in the computer.

Self-Tests and Diagnostics Overview

Introduces the three levels of diagnostic support tools.

Module Self-Tests

Describes self-tests performed by individual replaceable modules.

Power Supply

Details the self-tests for the power supply module.

Self-Test Supervisory Code

Explains the STSC's role in verifying module self-tests.

System Functional Tests

Describes tests for overall computer hardware and I/O cards.

98760A Display Color Alignment

Provides procedures for aligning the 98760A display's color.

Overview of the Alignment Process

Explains the steps involved in the display color alignment.

When Needed

Details when the display color alignment is necessary.

Required Equipment

Lists the necessary tools for display color alignment.

Test Conditions

Specifies optimal conditions for display alignment accuracy.

The Intensity Adjustment Procedure

Outlines the steps for performing the intensity adjustment.

Early Warning/Fault Tolerance

Describes features that provide early warnings of potential failures.

Assembly Access

General Safety Procedure

Provides basic safety precautions for assembly procedures.

Electrostatic Discharge

Details precautions to prevent damage from ESD.

Replaceable Assemblies

Outlines procedures for accessing and replacing various assemblies.

Display

Describes how to remove the display assembly.

Power Supply Assembly

Procedure to remove the power supply assembly.

Ac Module

Procedure to remove the AC module.

HP 98760A Standard Color Graphics Display

Procedures for accessing parts within the 98760A display.

Replaceable Parts

Processor Stack

Lists replaceable parts for the processor stack.

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