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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 7, “Parts listing, ThinkServer RD220 Type 3729, 3779, 3797, and 3798,” on page 231 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
+5v critical over voltage fault
1. Remove the following devices, which are powered by 5 volts:
v All PCI adapters
v USB devices
v CD-RW/DVD drive
v Tape drive, if one is installed
v Hard disk drive backplane
2. Reinstall each I/O device removed in step 1, one at a time,
restarting the server each time, to isolate a defective device.
Replace any defective device.
3. If the error continues, replace the power backplane. Restart the
server.
4. If the error continues, (trained service technician only) replace
the system board.
+5v critical under voltage fault
1. Remove the following devices, which are powered by 5 volts:
v All PCI adapters
v USB devices
v CD-RW/DVD drive
v Tape drive, if one is installed
v Hard disk drive backplane
2. Reinstall each I/O device removed in step 1, one at a time,
restarting the server each time, to isolate a defective device.
Replace any defective device.
3. If the error continues, replace the power backplane. Restart the
server.
4. If the error continues, (trained service technician only) replace
the system board.
5V fault
1. Remove the following devices, which are powered by 5 volts:
v All PCI adapters
v USB devices
v CD-RW/DVD drive
v Tape drive, if one is installed
v Hard disk drive backplane
2. Reinstall each I/O device removed in step 1, one at a time,
restarting the server each time, to isolate a defective device.
Replace any defective device.
3. If the error continues, replace the power backplane. Restart the
server.
4. If the error continues, (trained service technician only) replace
the system board.
+2.5v critical over voltage fault Information only
+2.5v critical under voltage fault Information only
138 ThinkServer RD220 Types 3729, 3779, 3797, and 3798: Hardware Maintenance Manual