IBM 7940, 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 3, “Parts listing, Type 7940 and 7941 servers,” on page 19 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.
BMC log message
Sensor
type Sensor
number
Action
CPU 1 Temp UNR Asserted
CPU 2 Temp UNR Asserted
CPU 1 Temp UC Asserted
CPU 2 Temp UC Asserted 01h
01h
01h
01h 98h
99h
98h
99h
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. (Trained service technician only) Make
sure that the heat sink for CPU n is
installed correctly.
3. (Trained service technician only) Replace
CPU n.
4. (Trained service technician only) Replace
the system board.
CPU 1 Temp UNC Asserted
CPU 2 Temp UNC Asserted 01h
01h 98h
99h
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. (Trained service technician only) Make
sure that the heat sink for CPU n is
installed correctly.
CPU 1 Temp UNR Deasserted
CPU 1 Temp UC Deasserted
CPU 1 Temp UNC Deasserted
CPU 2 Temp UNR Deasserted
CPU 2 Temp UC Deasserted
CPU 2 Temp UNC Deasserted 01h
01h
01h
01h
01h
01h 98h
98h
98h
99h
99h
99h Information only
FP Cable Absent 1Bh 83h
1. Reseat the front panel cable.
2. Replace the front panel cable.
3. Replace the front panel.
FP Cable Present 1Bh 83h Information only
CPU 1 Thermal Trip Asserted
CPU 2 Thermal Trip Asserted 07h
07h 90h
91h
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. (Trained service technician only) Make
sure that the heat sink for CPU n is
installed correctly.
3. (Trained service technician only) Replace
CPU n.
CPU 1 Thermal Trip Deasserted
CPU 2 Thermal Trip Deasserted 07h
07h 90h
91h Information only
CPU 1 Presense Detected Asserted
CPU 2 Presense Detected Asserted 07h
07h 90h
91h Information only
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IBM System x3455 Type 7940 and 7941: Problem Determination and Service Guide