Diagnosing
problems
using
the
Light
Path
diagnostics
LEDs
in
three
locations
on
the
server
are
available
to
help
you
diagnose
problems
that
might
occur
either
during
or
after
installation.
Use
them
in
the
following
order:
1.
LED
on
front
of
the
operator
information
panel
-
Look
at
this
panel
first.
If
a
system
error
has
occurred,
the
system-error
LED
on
the
front
of
the
operator
information
panel
is
lit.
2.
LEDs
on
the
Light
Path
Diagnostics
panel
-
Check
the
LEDs
on
the
Light
Path
diagnostics
panel,
which
is
on
the
top
of
the
operator
information
panel.
Descriptions
are
below
the
LEDs.
See
the
illustration
that
shows
the
LED
descriptions.
On
the
Light
Path
diagnostics
panel,
note
the
LEDs
that
are
lit
and
see
“Light
Path
diagnostics
LEDs”
for
information
about
the
LEDs.
After
you
note
the
LEDs
that
are
lit,
close
the
operator
information
panel.
3.
LEDs
on
the
system
board
-
Remove
the
server
cover
(see
“Removing
the
server
cover”
on
page
8)
to
identify
the
component
that
is
causing
the
error.
Note
the
lit
LED
next
to
the
failing
component
on
the
system
board.
The
following
example
illustrates
how
to
use
the
Light
Path
diagnostics
to
diagnose
a
system
error:
1.
In
this
example,
the
system
error
LED
on
the
operator
information
panel
is
lit.
2.
Pull
out
the
operator
information
panel
and
note
that
the
CPU
LED
is
lit
on
the
Light
Path
diagnostics
panel.
3.
See
the
“Light
Path
diagnostics
LEDs”
on
page
66
for
information
about
the
CPU
LED.
4.
Next
you
need
to
locate
which
Light
Path
diagnostics
LED
is
lit
on
the
system
board.
Follow
the
instructions
for
turning
off
the
server
in
“Turning
off
the
server”
on
page
32
and
see
“Removing
the
server
cover”
on
page
8
for
additional
information
on
removing
the
server
cover.
5.
After
removing
the
server
cover,
press
and
hold
the
blue
Light
Path
diagnostic
button
on
the
system
board
until
you
locate
the
lit
LED
beside
the
defective
microprocessor.
6.
Follow
the
instructions
in
the
Option
Installation
Guide
on
the
IBM
xSeries
Documentation
CD
to
remove
and
replace
the
microprocessor.
Light
Path
diagnostics
LEDs
The
following
table
lists
the
LEDs
on
the
Light
Path
diagnostics
panel,
the
problems
that
they
indicate,
and
actions
to
solve
the
problems.
66
IBM
xSeries
336
Type
8837:
Installation
Guide
Summary of Contents for 883725U
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