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 3, “Parts listing, Type 7979 and 1914 server,” on page 79 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.
System event/error log message Action
CPU n over temperature
n
= the microprocessor number
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. Make sure that the heat sink for microprocessor n is installed
correctly.
3. (Trained service technician only) Replace microprocessor n.
CPU removal detected Information only. Take action as appropriate.
CPU n non-critical over temperature warning
n
= the microprocessor number
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. Make sure that the heat sink for microprocessor n is installed
correctly.
CPU n non-recoverable over temperature fault
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. Make sure that the heat sink for microprocessor n is installed
correctly.
3. (Trained service technician only) Replace microprocessor n
4. (Trained service technician only) Replace the system board.
VRD 1 critical over voltage fault
1. (Trained service technician only) Reseat microprocessor 1.
2. (Trained service technician only) Replace the system board.
VRD 1 critical under voltage fault
1. (Trained service technician only) Reseat microprocessor 1.
2. (Trained service technician only) Replace the system board.
VRD 2 critical over voltage fault
VRD 2 = VRM
1. Reseat the VRM.
2. (Trained service technician only) Reseat microprocessor 2.
3. (Trained service technician only) Replace the system board.
VRD 2 critical under voltage fault
VRD
2 = VRM
1. Reseat the VRM.
2. (Trained service technician only) Reseat microprocessor 2.
3. (Trained service technician only) Replace the system board.
Processor VTT Power Fault.
1. (Trained service technician only) Reseat microprocessor 1.
2. (Trained service technician only) Replace the system board.
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. To
diagnose a power problem, use the following general procedure:
74 IBM System x3650 Type 7979 and 1914: Problem Determination and Service Guide
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