Specifications

Chapter 2. Diagnostics Overview

Models 25F/80, 256/F0, and 256/F1 systems use an integrated set of software

diagnostic procedures to facilitate isolation of failing components and system

maintenance. This book, along with the

Diagnostic Information for Multiple Bus

Systems

, are the basis of the diagnostic procedures for Models 25F/80, 256/F0, and

256/F1 systems. In particular, the following sections in this book are important for the

trained service representative to understand and use when isolating a failure on the

system:

v Chapter 4, “Checkpoints” on page 77

v Chapter 5, “Error Code to FRU Index” on page 99

v Chapter 6, “Loading the System Diagnostics In Service Mode” on page 243

v Chapter 10, “Parts Information” on page 365

The manufacturer recommends that systems configured with 4 GB of memory or

greater have access toa4mmor8mmtape drive for submission of system dump

information if required. This function can be accomplished through locally attached or

network-attached devices, as appropriate.

Maintenance Analysis Procedures (MAPs)

Maintenance analysis procedures (MAPs) guide the trained service person through the

system. These MAPs are the entry point for all isolation and error-recovery procedures.

The MAPs are consistent with existing procedures and methods. The system uses a set

of integrated procedures, mentioned earlier, to which the MAPS are the primary entry

point.

The MAPS are as follows:

v Entry MAP

v Quick Entry MAP

v Problem Determination MAP

v Power MAP

v Minimum Configuration MAP

The Entry Map is the starting point for problem determination. The purpose of this MAP

is to quickly point to the appropriate MAP or service reference information either in this

book, or in the common book set, which includes the

Diagnostic Information for Multiple

Bus Systems

and the

PCI Adapter Placement Reference

The Quick Entry MAP is a subset of the Entry MAP and helps to save time for some

types of problems.

The Problem Determination MAP provides a structured analysis method to get an error

code if one is not provided by the customer, or if diagnostics cannot be loaded.