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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
166-906-xxx RMM 12C Test Failed The RMM
indicates a
failure in the
memory
configuration
bus (Bus 5).
a. Turn off the system and disconnect it
from the power source. You must
disconnect the system from ac power
to reset the RMM.
b. After 45 seconds, reconnect the
system to the power source and turn
on the system.
c. Run the test again.
d. Make sure that the DSA code is at the
latest level. For the latest level of DSA
code, go to http://www.ibm.com/
support/docview.wss?uid=psg1SERV-
DSA.
e. Make sure that the RMM firmware is at
the latest level. The installed firmware
level is shown in the DSA diagnostic
event log in the Firmware/VPD section
for this component. For the latest level
of firmware, go to
http://www.ibm.com/support/
docview.wss?uid=psg1 MIGR-4JTS2T
and select your system to display a
matrix of available firmware.
f. Run the test again.
g. Disconnect the system from the power
source.
h. (Trained service technician only)
Reseat the system board.
i. Reconnect the system to the power
source and turn on the system.
j. Run the test again.
Chapter 5. Diagnostics 87