Lenovo ThinkServer RD220 Hardware Maintenance Manual page 75

Table 3. DSA diagnostic messages (continued)
• Follow the suggested actions in the order in which they are listed in the Action column until the problem is
solved.
• See Chapter 7 "Parts listing, ThinkServer RD220 Type 3729, 3779, 3797, and 3798" on page 205 to determine
which components are customer replaceable units (CRU) and which components are field replaceable
units (FRU).
• 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
166-904-xxx RMM
Test State Description
12C Test Failed The RMM
indicates a
failure in the
power supply
bus (Bus 3).h
Action
1. Turn off the system and disconnect
it from the power source. You must
disconnect the system from ac power to
reset the RMM.
2. After 45 seconds, reconnect the system
to the power source and turn on the
system.
3. Run the test again.
4. Make sure that the DSA code is at
the latest level. For the latest level
of DSA diagnostic code, go to
http://www.ibm.com/support/docview.wss?uid=psg1SER
5. Make sure that the RMM firmware
is at the latest level. The installed
firmware level is shown in the DSA
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.
6. Run the test again.
7. Disconnect the system from the power
source.
8. Reseat the power supply backplane.
9. Reconnect the system to the power
source.
10. Run the test again.
11. Disconnect the system from the power
source.
12. (Trained service technician only) Reseat
the system board.
13. Reconnect the system to power and turn
on the system.
14. Run the test again.
.
Chapter 5
69
Diagnostics