Installing A Power Supply Into A Multiservice Switch 7440 - Nortel 7400 Hardware Installation

Installing a power supply into a Multiservice Switch 7440

Prerequisites
Procedure steps
Multiservice Switch 7400 Hardware Installation, Maintenance, and Upgrade 6.1S2
Install a power supply into a Nortel Networks Multiservice Switch 7440 to
provide power, or install a second power supply to provide redundancy.
WARNING
Damage to equipment; safety hazard
Protect the power feeds to the dc power supply as
described in NN10600-170 Nortel Networks Multiservice
Switch 7400 Hardware Description. Failure to protect the
power feeds can damage the equipment and pose a safety
hazard.
• A Nortel Networks Multiservice Switch 7440 requires a power supply
unit with PEC NTEP26 (ac) or NTEP27 (dc).
• Ensure that the product engineering code (PEC) of the replacement
power supply matches that of the power supply that was removed.
• Follow "Avoiding damage from static electricity" (page 208) to protect
the unit from damage by ESD or from transferring ESD to other
hardware.
1 If necessary remove the power supply filler (blank) from the power supply
bay. Fillers are removed and installed using the same procedure as for
power supplies.
2 Toggle to the standby position the power control on the power supply
faceplate. See the figure "Multiservice Switch 7440 power supply"
(page 396).
3 Use a 1/4-in. flat-head screwdriver to turn the locking screw on the power
supply faceplate to the unlocked (vertical) position. See the figure
"Inserting a power supply in a Multiservice Switch 7440" (page 295).
4 Insert the power supply into the vacant power supply slot. See the figure
"Inserting a power supply in a Multiservice Switch 7440" (page 295).
5 Push in on the locking latches to secure the power supply in place.
6 Turn the locking latches one 1/4 turn counter-clockwise.
Chapter 39 Hardware procedures 293