HPE ProLiant ML150 Gen9 User Manual page 64

Remove the power supply assembly from the server.
a.
Remove the power supply from its tray.
b.
Keep the power supply tray. It is required to install the RPS backplane in the server.
10.
Remove all other components specifically associated with the removed power supply.
11.
In a tower server, install the RPS backplane assembly:
12.
Remove the EMI gaskets from the bottom of the backplane.
a.
Hardware options installation 64