HP 20-Feb - Manual (Page 173)

Chapter 5 Replacing the Redundant Power Supply 171
Ch
apter 5
Figure 56 Replacing the Redundant Power Supply Module
Caution Do not move the covered power switch located at the bottom of
the module. By default, power is always kept on to ensure
redundant backup.
Note The redundant power supply module FRU comes with the entire
module and one power supply unit. If you need an individual
unit and not the entire module, then use the one that comes with
the replacement module and discard the rest of the housing.
Power Supply Module
Power Supply Unit