IBM X3950 X5 Problem Determination And Service Manual page 81

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 4, "Parts listing, Types 7145, 7146, 7143, and 7191," on page 81 to determine which components are
customer replaceable units (CRU) and which components are field replaceable units (FRU).
v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a
trained service technician.
Light path
diagnostics LED Description
PCI A PCI adapter has failed.
Note: The error LED next to the
failing adapter on the I/O-board
shuttle is also lit.
FAN A fan has failed or has been
removed.
Note: A failing or missing fan can
also cause the TEMP LED to be lit.
TEMP A system temperature or
component has exceeded thermal
specifications.
Note: A fan LED might also be lit.
Action
1. See the system-event log (see "Event logs" on page
38).
2. Reseat the following components:
a. Failing adapter (see "Removing an adapter" on
page 110 and "Replacing an adapter" on page
111)
b. The I/O board assembly (see "Removing the
I/O-board shuttle" on page 143 and "Replacing
the I/O-board shuttle" on page 144)
3. Replace the components listed in step 2, one at a
time, in the order shown, restarting the server each
time.
1. If a memory expansion module is attached to the
server, check to determine whether the front FAN
error LED is lit on the memory expansion module
or the server. The LED that is lit determines which
device you should troubleshoot.
2. Reinstall the removed fan (see "Replacing the front
hot-swap fans" on page 122).
3. If an individual fan LED is lit, replace the fan.
Note: A failing fan might not cause the fan LED to
be lit.
4. (Trained service technician only) Reseat the
microprocessor board (see "Removing the
microprocessor-board assembly" on page 171 and
"Replacing the microprocessor-board assembly" on
page 173).
5. (Trained service technician only) Replace the
microprocessor board.
1. See the system-event log for the source of the fault
(see "Event logs" on page 38).
2. Make sure that the airflow of the server is not
blocked.
3. If a fan LED is lit, reseat the fan (see "Removing
the front hot-swap fans" on page 120 and
"Replacing the front hot-swap fans" on page 122).
4. Replace the fan for which the LED is lit.
5. Make sure that the room is neither too hot nor too
cold (see "Environment" in "Server features and
specifications" on page 7).
65
Chapter 3. Diagnostics