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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 the Problem Determination and Service Guide on the IBM System x Documentation CDto 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.
Lit light path
diagnostics LED with
the system-error or
information LED also
lit Description Action
TEMP A system temperature or component
has exceeded specifications.
Note: A fan LED might also be lit.
1. See the BMC log or the system-error log (see the
Problem Determination and Service Guide on the
IBM System x Documentation CD) for the source
of the fault.
2. Make sure that the airflow in the server is not
blocked.
3. If a fan LED is lit, reseat the fan.
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 “Features and
specifications” on page 3).
CPU A microprocessor has failed, is
missing, or has been incorrectly
installed.
Note: (Trained service technician
only) Make sure that the
microprocessors are installed in the
correct sequence.
1. Check the BMC log or the system-error log to
determine the reason for the lit LED.
2. Find the failing, missing, or mismatched
microprocessor by checking the LEDs on the
system board.
3. (Trained service technician only) Reseat the failing
microprocessor
4. Replace the following components one at a time,
in the order shown, restarting the server each time:
a. (Trained service technician only) Failing
microprocessor
b. (Trained service technician only) System board
S_ERR Reserved
VRM A dc-dc regulator has failed or is
missing.
Note: This error is for either the
VRM or integrated VRD. If the VRD
has failed, the system board must
be replaced by an trained service
technician.
1. Check the BMC log or the system-error log to
determine the reason for the lit LED (for a VRM).
2. Find the failing or missing VRM by checking the
LEDs on the system board.
3. Install any missing VRMs.
4. Reseat the following components:
a. Failing VRM
b. (Trained service technician only)
Microprocessor associated with the VRM
5.
Replace the following components one at a time,
in the order shown, restarting the server each time:
a. Failing VRM
b. (Trained service technician only)
Microprocessor associated with the VRM
c. (Trained service technician only) System board
18 IBM System x3500 Type 7977: User’s Guide