Universal
Serial
Bus
(USB)
port
problems
The
USB
ports
are
shared
BladeCenter
unit
resources.
First,
make
sure
that
the
USB
ports
are
assigned
to
the
blade
server;
then,
see
the
following
table
and
“Solving
shared
BladeCenter
resource
problems”
on
page
108.
v
Follow
the
suggested
actions
in
the
order
in
which
they
are
listed
in
the
Action
column
until
the
problem
is
solved.
v
See
Chapter
3,
“Parts
listing,
Types
1885
and
8853,”
on
page
15
to
determine
which
components
are
CRUs
and
which
components
are
FRUs.
v
If
an
action
step
is
preceded
by
“(Trained
service
technician
only),”
that
step
must
be
performed
only
by
a
trained
service
technician.
Symptom
Action
A
USB
device
does
not
work.
1.
Check
the
function
of
the
shared
BladeCenter
unit
resources
(see
“Solving
shared
BladeCenter
resource
problems”
on
page
108).
2.
Make
sure
that:
v
The
operating
system
supports
USB
devices.
v
The
correct
USB
device
driver
is
installed.
3.
(Trained
service
technician
only)
Replace
the
system
board
assembly.
Light
path
diagnostics
Light
path
diagnostics
is
a
system
of
LEDs
on
the
control
panel
and
on
various
internal
components
of
the
blade
server.
When
an
error
occurs,
LEDs
can
be
lit
throughout
the
blade
server
to
help
identify
the
source
of
the
error.
After
you
remove
the
blade
server,
you
can
press
and
hold
the
light
path
diagnostics
switch
for
a
maximum
of
25
seconds
to
light
the
LEDs
and
locate
the
failing
component.
The
following
components
have
this
feature:
v
Hard
disk
drives
v
Light
path
diagnostics
panel
v
Microprocessors
v
Memory
modules
(DIMMs)
Viewing
the
light
path
diagnostics
LEDs
Before
working
inside
the
blade
server
to
view
light
path
diagnostics
LEDs,
read
the
safety
information
that
begins
on
page
vii
and
“Installation
guidelines”
on
page
19.
If
an
error
occurs,
view
the
light
path
diagnostics
LEDs
in
the
following
order:
1.
Look
at
the
control
panel
on
the
front
of
the
blade
server
(see
“Blade
server
controls
and
LEDs”
on
page
4).
v
If
the
information
LED
is
lit,
it
indicates
that
information
about
a
suboptimal
condition
in
the
blade
server
is
available
in
the
BMC
log
or
in
the
management-module
event
log.
v
If
the
blade-error
LED
is
lit,
it
indicates
that
an
error
has
occurred;
go
to
step
2.
2.
To
view
the
light
path
diagnostics
panel
and
LEDs,
complete
the
following
steps:
a.
Remove
the
blade
server
from
the
BladeCenter
unit.
b.
Place
the
blade
server
on
a
flat,
static-protective
surface.
Chapter
5.
Diagnostics
93
Summary of Contents for 8853L6U
Page 1: ...BladeCenter HS21 Types 1885 and 8853 Problem Determination and Service Guide...
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Page 146: ...Part Number 49Y0053 Printed in USA 1P P N 49Y0053...
