IBM xSeries 306m Problem Determination And Service Manual page 123

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 8849 and Type 8491 server," 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.
System-error log message
System shutoff due to +3.3V under voltage
System shutoff due to +12v over voltage.
System shutoff due to +12v under voltage.
System shutoff due to continuous +5v over
voltage.
System shutoff due to continuous +5v under
voltage.
System shutoff due to VRM 1 over voltage.
System shutoff due to VRM 1 under voltage.
System shutoff due to +2.5v under voltage.
System shutoff due to CPU over temperature.
Action
1. Reseat the following components:
a. (Trained service technician only) System board
b. (Trained service technician only) Power supply
2. (Trained service technician only) Replace the system board.
1. Reseat the following components:
a. (Trained service technician only) System board
b. (Trained service technician only) Power supply
2. (Trained service technician only) Replace the system board.
1. Reseat the following components:
a. (Trained service technician only) System board
b. (Trained service technician only) Power supply
2. (Trained service technician only) Replace the system board.
1. Reseat the following components:
a. (Trained service technician only) System board
b. (Trained service technician only) Power supply
2. (Trained service technician only) Replace the system board.
1. Reseat the following components:
a. (Trained service technician only) System board
b. (Trained service technician only) Power supply
2. (Trained service technician only) Replace the system board.
1. (Trained service technician only) Reseat the microprocessor.
2. Replace the following components one at a time, in the order
shown, restarting the server each time:
a. (Trained service technician only) Microprocessor
b. (Trained service technician only) System board
1. (Trained service technician only) Reseat the microprocessor.
2. Replace the following components one at a time, in the order
shown, restarting the server each time:
a. (Trained service technician only) Microprocessor
b. (Trained service technician only) System board
1. Reseat the following components:
a. (Trained service technician only) System board
b. (Trained service technician only) Power supply
2. (Trained service technician only) Replace the system board.
1. Make sure that the fans have good airflow and are not
obstructed.
2. (Trained service technician only) Reseat the microprocessor
heat-exchanger assembly.
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Chapter 5. Diagnostics