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Table 3. DSA diagnostic messages (continued)
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.
Message
number Component Test State Description Action
166-911-xxx RMM 12C Test Failed The RMM
indicates a
failure in the
memory bus.
8. Turn off the system and disconnect it
from the power source.
9. Remove all DIMMs (see “Removing a
memory module (DIMM)” on page
186).
10. Install the minimum memory
configuration for the system . To
determine the minimum memory
configuration for your system, see
“Features and technologies” on page
15.
11. Reconnect the system to the power
source and turn on the system.
12. Make sure that the reported memory
size is the same as the installed
memory size.
13. Run the test again. If the memory
passes the test, one of the
uninstalled DIMMs is the failing
component.
14. Repeat the steps to remove all
DIMMs as necessary, using different
DIMMs to isolate the failing
component. Change only one
component each time to identify the
specific cause of the error.
15. Replace the failing DIMM.
Chapter 5. Diagnostics 93