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Table 4. DSA 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 8, “Parts Listing, TD200x Machine Types 3719, 3821, 3822, and 3823,” on page 237 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
166-904-xxx IMM IMM I2C Test Failed The IMM
indicates a
failure in the
power supply
bus (Bus 3).
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.
5. Make sure that the IMM firmware is at the
latest level. The installed firmware level is
shown in the DSA log in the Firmware/VPD
section for this component. For more
information, see “Updating the firmware” on
page 267.
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) Replace 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 Lenovo Web
site for more troubleshooting information at
http://www.lenovo.com/support.
108 ThinkServer TD200x Types 3719, 3821, 3822, and 3823: Hardware Maintenance Manual