IBM 7940, Problem Determination And Service Manual

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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 3, “Parts listing, Type 7940 and 7941 servers,” on page 19 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.
BMC log message
Sensor
type Sensor
number
Action
Fan 1 Tach LC Deasserted
Fan 2 Tach LC Deasserted
Fan 3 Tach LC Deasserted 04h
04h
04h 40h
41h
42h Information only.
Planar 1.2V UC Asserted
Planar 1.2V LC Asserted 02h
02h 12h
12h Information only.
Planar 1.2V UC Deasserted
Planar 1.2V LC Deasserted 02h
02h 12h
12h Information only.
Planar 3.3V UC Asserted
Planar 3.3V LC Asserted 02h
02h 16h
16h Information only.
Planar 3.3V UC Deasserted
Planar 3.3V LC Deasserted 02h
02h 16h
16h Information only.
Planar 5V UC Asserted
Planar 5V LC Asserted 02h
02h 17h
17h Information only.
Planar 5V UC Deasserted
Planar 5V LC Deasserted 02h
02h 17h
17h Information only.
Planar VBAT UNC Asserted
Planar VBAT LNC Asserted 02h
02h 1Dh
1Dh Replace the battery.
Planar VBAT UNC Deasserted
Planar VBAT LNC Deasserted 02h
02h 1Dh
1Dh Information only.
Ambient Temp UNR Asserted 01h 32h
1. Make sure that the fans are operating and
are not obstructed.
2. Make sure that the air baffle is in place
and correctly installed.
3. Make sure that the server cover is
installed and fully closed.
4. (Trained service technician only) Replace
the system board.
Ambient Temp UNC Asserted 01h 32h
1. Make sure that the fans are operating and
are not obstructed.
2. Make sure that the air baffle is in place
and correctly installed.
3. Make sure that the server cover is
installed and fully closed.
Ambient Temp UNC Deasserted 01h 32h Information only
Chapter 5. Diagnostics
111