IBM x3655 Service Guide - Page 125

Diagnostics

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Chapter 5. Diagnostics This chapter describes the diagnostic tools that are available to help you solve problems that might occur in 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 181 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 Troubleshooting tables These tables list problem symptoms and actions to correct the problems. See "Troubleshooting tables" on page 126. v Light path diagnostics Use the light path diagnostics to diagnose system errors quickly. See "Light path diagnostics" on page 138 for more information. v Diagnostic programs, messages, and error codes The diagnostic programs are the primary method of testing the major components of the server. The diagnostic programs are in read-only memory on the server. See "Diagnostic programs, messages, and error codes" on page 144 for more information. POST When you turn on the server, it performs a series of tests to check the operation of the server components and some optional devices in the server. This series of tests is called the power-on self-test, or POST. If a power-on password is set, you must type the password and press Enter, when prompted, for POST to run. If POST is completed without detecting any problems, a single beep sounds, and the server startup is completed. If POST detects a problem, more than one beep might sound, or an error message is displayed. See "POST beep codes" and "POST error codes" on page 118 for more information. POST beep codes A beep code is a combination of short or long beeps or series of short beeps that are separated by pauses. For example, a "1-2-3" beep code is one short beep, a pause, two short beeps, a pause, and three short beeps. A beep code other than one beep indicates that POST has detected a problem. To determine the meaning of a beep code, see "Beep code descriptions" on page 108. If no beep code sounds, see "No-beep symptoms" on page 115. © Copyright IBM Corp. 2006 107

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Chapter
5.
Diagnostics
This
chapter
describes
the
diagnostic
tools
that
are
available
to
help
you
solve
problems
that
might
occur
in
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
181
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
Troubleshooting
tables
These
tables
list
problem
symptoms
and
actions
to
correct
the
problems.
See
“Troubleshooting
tables”
on
page
126.
v
Light
path
diagnostics
Use
the
light
path
diagnostics
to
diagnose
system
errors
quickly.
See
“Light
path
diagnostics”
on
page
138
for
more
information.
v
Diagnostic
programs,
messages,
and
error
codes
The
diagnostic
programs
are
the
primary
method
of
testing
the
major
components
of
the
server.
The
diagnostic
programs
are
in
read-only
memory
on
the
server.
See
“Diagnostic
programs,
messages,
and
error
codes”
on
page
144
for
more
information.
POST
When
you
turn
on
the
server,
it
performs
a
series
of
tests
to
check
the
operation
of
the
server
components
and
some
optional
devices
in
the
server.
This
series
of
tests
is
called
the
power-on
self-test,
or
POST.
If
a
power-on
password
is
set,
you
must
type
the
password
and
press
Enter,
when
prompted,
for
POST
to
run.
If
POST
is
completed
without
detecting
any
problems,
a
single
beep
sounds,
and
the
server
startup
is
completed.
If
POST
detects
a
problem,
more
than
one
beep
might
sound,
or
an
error
message
is
displayed.
See
“POST
beep
codes”
and
“POST
error
codes”
on
page
118
for
more
information.
POST
beep
codes
A
beep
code
is
a
combination
of
short
or
long
beeps
or
series
of
short
beeps
that
are
separated
by
pauses.
For
example,
a
“1-2-3”
beep
code
is
one
short
beep,
a
pause,
two
short
beeps,
a
pause,
and
three
short
beeps.
A
beep
code
other
than
one
beep
indicates
that
POST
has
detected
a
problem.
To
determine
the
meaning
of
a
beep
code,
see
“Beep
code
descriptions”
on
page
108.
If
no
beep
code
sounds,
see
“No-beep
symptoms”
on
page
115.
©
Copyright
IBM
Corp.
2006
107