Nortel 7400 Hardware Installation page 302

302 Chapter 39 Hardware procedures
NN10600-175 6.1S2
5 Use both hands to lift the power supply. Grasp the handle and lift with one
hand. Support the bottom of the power supply with the other hand. See
the figure "Installing a power supply into a Multiservice Switch 7480"
(page 303).
6 Insert the power supply into the vacant power supply bay and push it in
halfway.
7 Hold the faceplate handle in the down position and slide the power supply
the rest of the way in.
The power supply clicks into place when the connectors are firmly seated.
8 Flip the faceplate handle up so that it is flush with the faceplate.
9 Use a 1/4-inch flat-head screwdriver to lock the handle into place. Turn the
screw 90° clockwise.