IBM 7870B4U Service Manual page 209

v See Chapter 4, "Parts listing," on page 41 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.
Error code Description
166-903-xxx Failed the IMM self test due to a failure in the
LAN bus.
Action
1. Turn off the blade server, open the blade server
release levers and pull the blade server away
from the blade module bay, but do not remove
it. See "Removing the blade server from the
BladeCenter unit" on page 52 for more
information.
2. Wait 45 seconds and reseat the blade server in
the blade module bay and turn on the blade
server. See "Installing the blade server in a
BladeCenter unit" on page 53 and "Turning on
the blade server" on page 14.
3. Rerun the test. See "Diagnostic tools overview"
on page 101.
4. Make sure that the DSA Diagnostic code is
up-to-date, upgrade if necessary; then, rerun the
test. The latest code can be found on the IBM
support Web site at http://www.ibm.com/
systems/support/supportsite.wss/
docdisplay?brandind=5000008&lndocid=MIGR-
63017.
5. Make sure that the component firmware level is
up-to-date, upgrade if necessary; then, rerun the
test. The installed firmware level can be found
in the DSA Diagnostic Event Log within the
Firmware/VPD section for this component. The
latest level firmware for this component can be
found on the IBM support Web site at
http://www.ibm.com/systems/support/
supportsite.wss/docdisplay?brandind=5000008
&lndocid=MIGR-63017.
6. Make sure that the Ethernet device firmware
level is up-to-date, upgrade if necessary; then,
rerun the test. The installed firmware level can
be found in the DSA Diagnostic Event Log
within the Firmware/VPD section for this
component. The latest level firmware for this
component can be found on the IBM support
Web site at http://www.ibm.com/systems/
support/supportsite.wss/
docdisplay?brandind=5000008&lndocid=MIGR-
63017.
7. Turn off the blade server and reseat the blade
server in the blade server bay and turn on the
blade server. See "Removing the blade server
from the BladeCenter unit" on page 52 for more
information.
8. Rerun the test.
9. If the failure remains, refer to Chapter 5,
"Removing and replacing blade server
components," on page 49 to replace the failed
component.
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Chapter 6. Diagnostics