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Testing and Troubleshooting
Chapter
3
Introduction
This chapter contains information to help you test the computer and diagnose failures. T rouble-
shooting and repair strategy is briefly described. Then, the problem isolation section relates service
panel indications to probable faults.
The remainder of the chapter contains descriptions of the service processor code, loader ROM test
module, loader error messages, self-tests and diagnostics, and early warninglfault tolerance fea-
tures.
Troubleshooting and Repair Strategy
To troubleshoot a failing computer, perform the problem isolation procedures provided below. The
diagnostics and service panel indicators are designed to enable fast fault isolation to a replaceable
module. Every replaceable module can be replaced within 15 minutes from fully assembled
machine, through disassembly and replacement, back to fully assembled machine.
Chapter 4 contains the procedures to access and replace failed modules in the computer, and
Chapter 5 has exploded view drawings of the computer showing attaching parts. All replaceable
parts are listed in Chapter 5.
Problem Isolation
Figure 3-1 shows the service panel indications of a normal, fault-free power-up sequence from
power on to operating system running. A computer fault aborts this sequence. In most cases, the
service panel indicates the fault.
3-1
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