IBM 2283, Hardware Maintenance Service

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34 IBM Desktop System HMM
Introduction
This chapter contains the check procedures used to
diagnose the causes of product failures. The
diagnostic information consists of:
Start: This is the starting point for any diagnostic
action. Based on high-level symptoms, the check
procedure directs you to more detailed procedures to
help resolve machine failures.
Index of Symptoms, Messages, Error Codes, or
Beeps:
The tables for BIOS Error Messages, Codes,
Beeps, and Error Symptoms list symptoms along with
their probable causes, and direct you to the
applicable check procedures to help resolve machine
failures. These tables also list the field replaceable
units (FRUs) most likely to cause a particular
problem.
Check Procedures: When the Start check
procedure or the Index of Symptoms, Messages,
Error Codes, or Beeps tables point you to a specific
check procedure, proceed to that section. If there are
any notes or instructions at the top of the page, read
them before you begin with the procedure. Carefully
read each step of the check procedure and perform
the steps as instructed. If you do not remember the
location of a specific part or test point, or an
adjustment or removal procedure, see the chapter
that contains that information. Always return to the
check procedure after you do this. In some cases,
you are referred to other check procedures to detect
the cause of the failure.