Nortel 7400 Hardware Installation page 475

Procedure steps
1 Toggle to the standby position the power control on the power supply
faceplate. See the figure "Unlocked power supply on a Multiservice
Switch 7480 with the power control in the standby position" (page 476).
2 Use a 1/4-in. flat-head screwdriver to turn the locking screw on the power
supply faceplate to the unlocked (vertical) position, as shown in the figure.
3 Pull the faceplate handle down to release the power supply's latch. Use
this handle when you remove the unit.
4 Slide the power supply carefully about half-way out of its slot.
5 Use one hand to hold the handle, and use the other hand to support the
unit's weight. Carefully slide the unit completely out of the slot.
Multiservice Switch 7400 Hardware Installation, Maintenance, and Upgrade 6.1S2
Chapter 39 Hardware procedures 475