IBM Aptiva 2170, Hardware Maintenance Service Manual

Page: 66 / 252

32
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.