IBM xSeries 150 User Reference Manual page 58

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IBM® xSeries 150 : User's Reference
a. If the NON (non-redundant) LED is lit, you do not have redundancy: turn off
the server and peripheral devices; then, continue with step 2..
Note: The Information light on the operator information panel on the front
of the server also will be on. See for the location and contents of the
operator information panel.
b. If the NON LED is not lit, you have redundancy and do not need to turn off
the server. Continue with step 2..
Note: The illustrations in this document might differ slightly from your
hardware.
2. Unplug the power cord from the power supply.
Attention: Be careful when you remove the power supply; the power supply
might be too hot to handle comfortably.
Statement 12
CAUTION:
The following label indicates a hot surface nearby.
3. Remove the defective power supply.
Diagnostics panel