IBM 88643RU Service Guide - Page 171

Solving, power, problems, Ethernet, controller

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Solving power problems Power problems can be difficult to solve. For example, a short circuit can exist anywhere on any of the power distribution buses. Usually, a short circuit will cause the power subsystem to shut down because of an overcurrent condition. Use the following general procedure for diagnosing a power problem: 1. Turn off the server and disconnect all ac power cords. 2. Check for loose cables in the power subsystem. Also check for short circuits, for example, if a loose screw is causing a short circuit on a circuit board. 3. Remove the adapters and disconnect the cables and power cords to all internal and external devices until the server is at the minimum configuration that is required for the server to start (see "Minimum operating requirements" on page 156). 4. Reconnect all ac power cords and turn on the server. If the server starts successfully, replace the adapters and devices one at a time until the problem is isolated. If the server does not start from the minimum configuration, replace the components in the minimum configuration one at a time until the problem is isolated. To use this method, you must know the minimum configuration that is required for the server to start (see "Solving undetermined problems" on page 156). Solving Ethernet controller problems The method that you use to test the Ethernet controller depends on which operating system you are using. Check the operating-system documentation for information about Ethernet controllers, and see the Ethernet controller device driver readme file. Make sure that the latest device drivers are installed. If the problem remains after you check these factors, try the following procedures: v Make sure that the Ethernet cable is installed correctly. - The cable must be securely attached at all connections. If the cable is attached but the problem remains, try a different cable. - If you set the Ethernet controller to operate at 100 Mbps, you must use Category 5 cabling. - If you directly connect two servers (without a hub), or if you are not using a hub with X ports, use a crossover cable. To determine whether a hub has an X port, check the port label. If the label contains an X, the hub has an X port. v Determine whether the hub supports auto-negotiation. If it does not, try configuring the integrated Ethernet controller manually to match the speed and duplex mode of the hub. v Check the Ethernet controller LEDs on the rear panel of the server. These LEDs indicate whether there is a problem with the connector, cable, or hub. - The Ethernet link status LED is lit when the Ethernet controller receives a link pulse from the hub. If the LED is off, there might be a defective connector or cable or a problem with the hub. - The Ethernet transmit/receive activity LED is lit when the Ethernet controller sends or receives data over the Ethernet network. If the Ethernet transmit/receive activity light is off, make sure that the hub and network are operating and that the correct device drivers are installed. Chapter 5. Diagnostics 155

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Solving
power
problems
Power
problems
can
be
difficult
to
solve.
For
example,
a
short
circuit
can
exist
anywhere
on
any
of
the
power
distribution
buses.
Usually,
a
short
circuit
will
cause
the
power
subsystem
to
shut
down
because
of
an
overcurrent
condition.
Use
the
following
general
procedure
for
diagnosing
a
power
problem:
1.
Turn
off
the
server
and
disconnect
all
ac
power
cords.
2.
Check
for
loose
cables
in
the
power
subsystem.
Also
check
for
short
circuits,
for
example,
if
a
loose
screw
is
causing
a
short
circuit
on
a
circuit
board.
3.
Remove
the
adapters
and
disconnect
the
cables
and
power
cords
to
all
internal
and
external
devices
until
the
server
is
at
the
minimum
configuration
that
is
required
for
the
server
to
start
(see
“Minimum
operating
requirements”
on
page
156).
4.
Reconnect
all
ac
power
cords
and
turn
on
the
server.
If
the
server
starts
successfully,
replace
the
adapters
and
devices
one
at
a
time
until
the
problem
is
isolated.
If
the
server
does
not
start
from
the
minimum
configuration,
replace
the
components
in
the
minimum
configuration
one
at
a
time
until
the
problem
is
isolated.
To
use
this
method,
you
must
know
the
minimum
configuration
that
is
required
for
the
server
to
start
(see
“Solving
undetermined
problems”
on
page
156).
Solving
Ethernet
controller
problems
The
method
that
you
use
to
test
the
Ethernet
controller
depends
on
which
operating
system
you
are
using.
Check
the
operating-system
documentation
for
information
about
Ethernet
controllers,
and
see
the
Ethernet
controller
device
driver
readme
file.
Make
sure
that
the
latest
device
drivers
are
installed.
If
the
problem
remains
after
you
check
these
factors,
try
the
following
procedures:
v
Make
sure
that
the
Ethernet
cable
is
installed
correctly.
–
The
cable
must
be
securely
attached
at
all
connections.
If
the
cable
is
attached
but
the
problem
remains,
try
a
different
cable.
–
If
you
set
the
Ethernet
controller
to
operate
at
100
Mbps,
you
must
use
Category
5
cabling.
–
If
you
directly
connect
two
servers
(without
a
hub),
or
if
you
are
not
using
a
hub
with
X
ports,
use
a
crossover
cable.
To
determine
whether
a
hub
has
an
X
port,
check
the
port
label.
If
the
label
contains
an
X,
the
hub
has
an
X
port.
v
Determine
whether
the
hub
supports
auto-negotiation.
If
it
does
not,
try
configuring
the
integrated
Ethernet
controller
manually
to
match
the
speed
and
duplex
mode
of
the
hub.
v
Check
the
Ethernet
controller
LEDs
on
the
rear
panel
of
the
server.
These
LEDs
indicate
whether
there
is
a
problem
with
the
connector,
cable,
or
hub.
–
The
Ethernet
link
status
LED
is
lit
when
the
Ethernet
controller
receives
a
link
pulse
from
the
hub.
If
the
LED
is
off,
there
might
be
a
defective
connector
or
cable
or
a
problem
with
the
hub.
–
The
Ethernet
transmit/receive
activity
LED
is
lit
when
the
Ethernet
controller
sends
or
receives
data
over
the
Ethernet
network.
If
the
Ethernet
transmit/receive
activity
light
is
off,
make
sure
that
the
hub
and
network
are
operating
and
that
the
correct
device
drivers
are
installed.
Chapter
5.
Diagnostics
155