IBM 88643RU Service Guide - Page 79

Diagnostic, tools

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Chapter 5. Diagnostics This chapter provides basic troubleshooting information to help you solve some common problems that might occur with the server. If you cannot locate and correct the problem using the information in this chapter, see Appendix A, "Getting help and technical assistance," on page 161 for more information. Diagnostic tools The following tools are available to help you diagnose and solve hardware-related problems: v POST beep codes, error messages, and error logs The power-on self-test (POST) generates beep codes and messages to indicate successful test completion or the detection of a problem. See "POST" for more information. v Problem isolation tables Use these tables to help you diagnose various symptoms. See "Problem isolation tables" on page 88. v Light path diagnostics Use the light path diagnostics to diagnose system errors quickly. See "Light path diagnostics" on page 101 for more information. v Diagnostic programs and error messages The diagnostic programs are stored in memory on the microprocessor tray. These programs are the primary method of testing the major components of the server. See "Diagnostic programs, messages, and error codes" on page 110 for more information. POST When you turn on the server, it performs a series of tests to check the operation of server components and some of the options in the server. This series of tests is called the power-on self-test, or POST. If POST finishes without detecting any problems, a single beep sounds, and the first screen of the operating system opens, or an application program starts. If POST detects a problem, more than one beep might sound, or an error message appears on the screen. See "Beep code descriptions" on page 64 and "POST error codes" on page 72 for more information. Notes: 1. If a power-on password is set, you must type the password and press Enter, when prompted, before POST will continue. 2. A single problem might cause several error messages. When this occurs, correct the cause of the first error message. The other error messages usually will not occur the next time you run the test. © Copyright IBM Corp. 2006 63

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Chapter
5.
Diagnostics
This
chapter
provides
basic
troubleshooting
information
to
help
you
solve
some
common
problems
that
might
occur
with
the
server.
If
you
cannot
locate
and
correct
the
problem
using
the
information
in
this
chapter,
see
Appendix
A,
“Getting
help
and
technical
assistance,”
on
page
161
for
more
information.
Diagnostic
tools
The
following
tools
are
available
to
help
you
diagnose
and
solve
hardware-related
problems:
v
POST
beep
codes,
error
messages,
and
error
logs
The
power-on
self-test
(POST)
generates
beep
codes
and
messages
to
indicate
successful
test
completion
or
the
detection
of
a
problem.
See
“POST”
for
more
information.
v
Problem
isolation
tables
Use
these
tables
to
help
you
diagnose
various
symptoms.
See
“Problem
isolation
tables”
on
page
88.
v
Light
path
diagnostics
Use
the
light
path
diagnostics
to
diagnose
system
errors
quickly.
See
“Light
path
diagnostics”
on
page
101
for
more
information.
v
Diagnostic
programs
and
error
messages
The
diagnostic
programs
are
stored
in
memory
on
the
microprocessor
tray.
These
programs
are
the
primary
method
of
testing
the
major
components
of
the
server.
See
“Diagnostic
programs,
messages,
and
error
codes”
on
page
110
for
more
information.
POST
When
you
turn
on
the
server,
it
performs
a
series
of
tests
to
check
the
operation
of
server
components
and
some
of
the
options
in
the
server.
This
series
of
tests
is
called
the
power-on
self-test,
or
POST.
If
POST
finishes
without
detecting
any
problems,
a
single
beep
sounds,
and
the
first
screen
of
the
operating
system
opens,
or
an
application
program
starts.
If
POST
detects
a
problem,
more
than
one
beep
might
sound,
or
an
error
message
appears
on
the
screen.
See
“Beep
code
descriptions”
on
page
64
and
“POST
error
codes”
on
page
72
for
more
information.
Notes:
1.
If
a
power-on
password
is
set,
you
must
type
the
password
and
press
Enter,
when
prompted,
before
POST
will
continue.
2.
A
single
problem
might
cause
several
error
messages.
When
this
occurs,
correct
the
cause
of
the
first
error
message.
The
other
error
messages
usually
will
not
occur
the
next
time
you
run
the
test.
©
Copyright
IBM
Corp.
2006
63