5. Install the backplane at the rear of bank D or E:
a. Align the top screw hole on the left side of the backplane with the top screw
hole on the left side of bank D, making sure the dimples on the backplane
line up with the holes on the frame of the system.
b. Secure the backplane with one screw.
5-60 IBM RS/6000 7025 F50 Series User's Guide