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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 the parts listing in the Hardware Maintenance Manual 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.
LED Description Action
CPU When only the CPU LED is lit, a
microprocessor has failed.
When the CPU and CNFG LEDs are lit,
the microprocessor configuration is not
valid.
1. Determine whether the CNFG LED is also lit. If the CNFG
LED is not lit, a microprocessor has failed.
a. Make sure that the failing microprocessor, which is
indicated by a lit LED on the system board, is installed
correctly. See the Hardware Maintenance Manual for
information about installing a microprocessor.
b. If the failure remains, call service.
2. If the CNFG LED is lit, then an invalid microprocessor
configuration has occurred.
a. Make sure that the microprocessors are compatible with
each other. They must match in speed and cache size.
To compare the microprocessor information, run the
Setup utility and select System Information, then select
System Summary, and then select Processor Details.
b. (Trained service technician only) Replace an
incompatible microprocessor.
c. If the failure remains, call for service.
VRM Reserved.
DASD A hard disk drive error has occurred. A
hard disk drive has failed or is missing.
1. Check the LEDs on the hard disk drives for the drive with a
lit status LED and reseat the hard disk drive.
2. Reseat the hard disk drive backplane.
3. Remove and reinstall the hard disk drive backplanes.
4. Replace the hard disk drive backplane for the failing drive or
drives.
5. Call for service.
RAID Reserved
BRD An error has occurred on the system
board.
1. Check the LEDs on the system board to identify the
component that is causing the error.
2. Check the system-event log for information about the error.
3. Replace any failed or missing replaceable components,
such as the battery or PCI riser-card assembly.
4. If a voltage regulator has failed, replace the system board.
Power-supply LEDs
The following minimum configuration is required for the DC LED on the power
supply to be lit:
v Power supply
v Power cord
The following minimum configuration is required for the server to start:
v One microprocessor
v One 1 GB DIMM per microprocessor on the system board
v One power supply
50 ThinkServer RD220 Types 3729, 3779, 3797, and 3798: Hardware Maintenance Manual