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 F 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. Remove the hard disk drives
and the hard disk drive
backplanes.
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 PS n Therm Fault has
transitioned to critical from a less
severe state.
(
n = power supply number)
Error A sensor has changed to
Critical state from a less
severe state.
1. Make sure that there are no
obstructions, such as bundled
cables, to the airflow from the
power-supply fan.
2. Replace power supply n .
( n = power supply number)
Sensor PS n 12V OV Fault has
transitioned to non-recoverable.
(
n = power supply number)
Error A sensor has changed to
Nonrecoverable state.
1. Remove the power supplies.
2. Replace power supply n .
3. (Trained service technician
only) Replace the system
board.
( n = power supply number)
Sensor PS n 12V UV Fault has
transitioned to non-recoverable.
Error A sensor has changed to
Nonrecoverable state.
1. Remove the power supplies.
2. Replace power supply n .
3. (Trained service technician
only) Replace the system
board.
( n = power supply number)
Sensor PS n 12V OC Fault has
transitioned to non-recoverable.
(
n = power supply number)
Error A sensor has changed to
Nonrecoverable state.
1. Remove the power supplies.
2. Replace power supply n .
3. (Trained service technician
only) Replace the system
board.
( n = power supply number)
Sensor PS n VCO Fault has
transitioned to non-recoverable.
(
n = power supply number)
Error A sensor has changed to
Nonrecoverable state.
1. Replace the failing power
supply.
( n = power supply number)
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IBM System x3400 M3 Types 7378 and 7379: Problem Determination and Service Guide