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, ThinkServer RD120 Machine Types 6444, 6445, 6446, and 6447,” on page 25
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
+3.3v critical under voltage fault
1. Remove all PCI adapters.
2. Reinstall each PCI adapter, one at a time, restarting the server
each time, to isolate a defective adapter. Replace any defective
adapter.
3. If the error continues, (trained service technician only) replace
the system board.
3.3V Bus Fault
1. Remove all PCI adapters.
2. Reinstall each PCI adapter, one at a time, restarting the server
each time, to isolate a defective adapter. Replace any defective
adapter.
3. If the error continues, (trained service technician only) replace
the system board.
Power Good Fault Attention: In a dc power environment, only trained service
personnel other than Lenovo service technicians are authorized to
connect or disconnect power to the dc power supply and to install
and remove the dc power supply. See the documentation that
comes with each dc power supply.
1. Reseat the power supplies.
2. If the error continues, replace the power backplane.
VRM 1 Power Good Fault
1. (Trained service technician only) Reseat microprocessor 1.
2. (Trained service technician only) Replace microprocessor 1.
3. (Trained service technician only) Replace the system board.
VRM 2 Power Good Fault
1. Reseat the VRM.
2. (Trained service technician only) Reseat microprocessor 2.
3. Replace the VRM.
4. (Trained service technician only) Replace microprocessor 2.
5. (Trained service technician only) Replace the system board.
VRM 2 is present Information only
VRM 2 is not present If microprocessor 2 is installed, install or replace the VRM.
Memory Area non-critical over temperature
warning
1. Make sure that the fans are operating and are not obstructed.
2. Make sure that the air baffles are in place and correctly
installed.
3. Make sure that the server cover is installed and fully closed.
Memory Area non-recoverable over temperature
fault
1. Make sure that the fans are operating and are not obstructed.
2. Make sure that the air baffles are in place and correctly
installed.
3. Make sure that the server cover is installed and fully closed.
4. (Trained service technician only) Replace the system board.
188 ThinkServer RD120 server Machine Types 6444, 6445, 6446, and 6447: Hardware Maintenance Manual
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