Removing The Power Supply From A Multiservice Switch 7440 - Nortel 7400 Hardware Installation

466 Chapter 39 Hardware procedures
Removing the power supply from a Multiservice
Switch 7440
Prerequisites
Procedure steps
NN10600-175 6.1S2
Remove a failed power supply from a Nortel Networks Multiservice
Switch 7440 before installing a new one.
WARNING
Damage to equipment by electromagnetic interference
To meet electromagnetic interference (EMI) regulatory
requirements and thermal specifications, each empty
power supply bay must be covered with a power supply
filler (blank). Power supply fillers are removed and
installed using the same procedure as for power supplies.
1 Toggle to the standby position the power control on power supply
faceplate. See the figure "Multiservice Switch 7440 power supply"
(page 467).
2 At the power distribution panel, toggle off the circuit breaker for the outlet
that supplies power to the power supply you want to remove. Ensure that
the outlet is void of primary power.
3 If you are removing a dc power supply, disconnect the battery wire, the
battery return wire, and the ground wire from the terminal block. See the
figure "Multiservice Switch 7440 dc wiring" (page 468).
or
If you are removing an ac power supply, disconnect the power cord from
the power input panel at the rear of the device. See "Removing the ac
power supply from a Multiservice Switch 7440" (page 470)
4 Unlock the power supply: turn the power supply locking latches one-
quarter turn clockwise. See the figure "Unlocking and removing a power
supply from a Multiservice Switch 7440" (page 469).
5 Pull outwards on the latches to release the power supply and pull the
power supply carefully from the device.