Nortel Passport 7400, Hardware Installation, Maintenance, And Troubleshooting, Page: 340 / 438

340 Chapter 37 Hardware procedures
241-7401-240 5.2S1
Removing a 5-slot Passport switch power supply
Remove a failed power supply before installing a new one.
Prerequisites
Procedure steps
1 Set the power switch on the power supply faceplate to the standby
position. See the figure “5-slot Passport switch power supply” (page 341).
2 At the power distribution panel, turn 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 “5-slot Passport switch dc wiring” (page 342).
or
If you are removing an ac power supply, disconnect the power cord from
the power input panel at the rear of the switch. See “Removing a 5-slot
Passport switch ac power supply” (page 344)
4 Unlock the power supply: turn the power supply locking latches one-
quarter turn clockwise. See the figure “Unlocking and removing a 5-slot
Passport switch power supply” (page 343).
5 Pull outwards on the latches to release the power supply and pull the
power supply carefully from the switch.
WARNING
Damage to equipment by electromagnetic interference
To meet electromagnetic interference (EMI) regulatory
requirements and thermal specifications, empty power
supply bays must be fitted with power supply blanks.
Power supply blanks are removed and installed using the
same procedure as for power supplies.