IBM System x3550 M3 Type 4254 Problem Determination And Service Manual page 154

Table 9. DSA Preboot 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 4, "Parts listing, System x3550 M3 Types 4254 and 7944," on page 159 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.
v Go to the IBM support Web site at http://www.ibm.com/systems/support/ to check for technical information, hints, tips,
and new device drivers or to submit a request for information.
Message
number Component
166-904-xxx IMM
136
IBM System x3550 M3 Types 4254 and 7944: Problem Determination and Service Guide
Test State Description
IMM I2C Test Failed The IMM
indicates a
failure in the
power supply
bus (Bus 3).
Action
1. Turn off the system and disconnect it from the
power source. You must disconnect the system
from ac power to reset the IMM.
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 code, go to
http://www.ibm.com/support/
docview.wss?uid=psg1SERV-DSA.
5. Make sure that the IMM 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 more information, see
"Updating the firmware" on page 255.
6. Run the test again.
7. Reseat the power supply.
8. Run the test again.
9. Turn off the system and disconnect it from the
power source.
10. (Trained service technician only) Reseat the
system board.
11. Reconnect the system to the power source and
turn on the system.
12. Run the test again.
13. If the failure remains, go to the IBM Web site for
more troubleshooting information at
http://www.ibm.com/systems/support/
supportsite.wss/docdisplay?brandind=5000008
&lndocid=SERV-CALL.