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.
Sensor Pwr Rail A Fault has
transitioned to non-recoverable. Error A sensor has changed to
Nonrecoverable state.
1. Turn off the server and
disconnect it from power.
2. (Trained service technician
only) Remove the PCI
adapter and microprocessor
1. Reinstall the
microprocessor in socket 1
and restart the server.
3. Restart the server.
4. Reinstall each device, one at
a time, starting the server
each time to isolate the failing
device.
5. Replace the failing device.
6. (Trained service technician
only) Replace the system
board.
Sensor Pwr Rail B Fault has
transitioned to non-recoverable. Error A sensor has changed to
Nonrecoverable state.
1. Turn off the server and
disconnect it from power.
2. (Trained service technician
only) Remove the PCI
adapter and microprocessor
2.
3. Restart the server.
4. Reinstall each device, one at
a time, starting the server
each time to isolate the failing
device.
5. Replace the failing device.
6. (Trained service technician
only) Replace the system
board.
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IBM System x3400 M3 Types 7378 and 7379: Problem Determination and Service Guide