Light
path
diagnostics
Light
path
diagnostics
is
a
system
of
LEDs
on
various
external
and
internal
components
of
the
server.
When
an
error
occurs,
LEDs
are
lit
throughout
the
server.
By
viewing
the
LEDs
in
a
particular
order,
you
can
often
identify
the
source
of
the
error.
The
server
is
designed
so
that
LEDs
remain
lit
when
the
server
is
connected
to
an
ac
power
source
but
is
not
turned
on,
provided
that
the
power
supply
is
operating
correctly.
This
feature
helps
you
to
isolate
the
problem
when
the
operating
system
is
shut
down.
Any
PCI-X,
memory,
microprocessor,
and
VRM
LED
can
be
lit
again
without
ac
power
after
you
remove
the
microprocessor
tray
so
that
you
can
isolate
a
problem.
After
ac
power
has
been
removed
from
the
server,
power
remains
available
to
these
LEDs
for
up
to
24
hours.
To
view
the
PCI-X,
memory,
microprocessor,
and
VRM
LEDs,
press
and
hold
the
light-path-diagnostics
button
on
the
PCI-X
board,
memory
card,
or
microprocessor
board
for
30
seconds
to
light
the
error
LEDs.
The
LEDs
that
were
lit
while
the
server
was
running
will
be
lit
again
while
the
button
is
pressed.
Many
errors
are
first
indicated
by
a
lit
information
LED
or
system-error
LED
on
the
operator
information
panel
on
the
front
of
the
server.
If
one
or
both
of
these
LEDs
are
lit,
one
or
more
LEDs
elsewhere
in
the
server
might
also
be
lit
and
can
direct
you
to
the
source
of
the
error.
Before
working
inside
the
server
to
view
light
path
diagnostics
LEDs,
read
the
safety
information
that
begins
on
page
v
and
“Handling
static-sensitive
devices”
on
page
8.
If
an
error
occurs,
view
the
light
path
diagnostics
LEDs
in
the
following
order:
1.
Check
the
operator
information
panel
on
the
front
of
the
server.
v
If
the
information
LED
is
lit,
it
indicates
that
information
about
a
suboptimal
condition
in
the
server
is
available
in
the
BMC
log
or
in
the
system-error
log.
Important:
If
the
server
has
a
baseboard
management
controller,
clear
the
BMC
log
and
system-event
log
after
you
resolve
all
conditions.
This
will
turn
off
the
information
LED
and
LOG
LED,
if
all
conditions
are
resolved.
v
If
the
system-error
LED
is
lit,
it
indicates
that
an
error
has
occurred;
go
to
step
2
on
page
75.
The
following
illustration
shows
the
operator
information
panel.
Power-control button
Power-on LED
USB connector
Hard disk drive activity LED
Information LED
System-error LED
Locator LED
Release latch
74
IBM
ERserver
xSeries
460
Type
8872
and
xSeries
MXE
460
Type
8874:
Installation
Guide
Содержание 8874 - eServer xSeries MXE 460
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