Nortel 7400 Hardware Installation page 472

472 Chapter 39 Hardware procedures
Procedure steps
NN10600-175 6.1S2
1 Toggle to the standby position the power control on the power supply
faceplate, as shown in figure "Exploded view of power supplies in a
Multiservice Switch 7460" (page 473).
2 Unfasten the 2 Phillips captive thumb screws. These are the screws with
the large knobs.
3 Unseat the power supply to disengage the connectors inside the shelf
assembly. Stop pulling when the handle is approximately 10 cm (4 in.)
away from the front of the shelf assembly. Do not remove the power supply
yet.
4 As soon as the power supply is disengaged, its LED on the faceplate
changes from green to red. Red occurs while the capacitors inside the
power supply are discharging. Wait until the red LED on the faceplate
becomes unlit. Unlit means the capacitors are fully discharged.
5 Slide the power supply all the way out. Be prepared to support it when it
clears the bay.