IBM 6644 User Manual
30 IBM Desktop System HMM
Introduction
This chapter contains the check procedures used to
diagnose the causes of product failures. The
diagnostic information consists of:
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.
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 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.
Beeps: The tables for BIOS Error Messages, Codes,
Beeps and Error Symptoms list 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.
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.