IBM 7378, Problem Determination And Service Manual

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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, System x3400 M3 Types 7378 and 7379,” on page 141 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.
Memory DIMM disabled for DIMM n
Status on Memory Subsystem DIMM
n Status.
( n = DIMM number)
Info DIMM disabled.
1. Make sure the DIMM is
installed correctly (see
“Installing a memory module”
on page 231).
2. If the DIMM was disabled
because of a memory fault
(memory uncorrectable error
or memory logging limit
reached), follow the
suggested actions for that
error event and restart the
server.
3. Check the IBM support
website for an applicable
retain tip or firmware update
that applies to this memory
event. If no memory fault is
recorded in the logs and no
DIMM connector error LED is
lit, you can re-enable the
DIMM through the Setup
utility or the Advanced
Settings Utility (ASU).
Sensor DIMM n Temp has
transitioned to critical from a less
severe state.
(
n = DIMM number)
Error A sensor has changed to
Critical state from a less
severe state.
1. Make sure that the fans are
operating, that there are no
obstructions to the airflow,
that the air baffles are in
place and correctly installed,
and that the server cover is
installed and completely
closed.
2. If a fan has failed, complete
the action for a fan failure.
3. Replace DIMM n .
( n = DIMM number)
Chapter 3. Diagnostics
63