Nortel 7400 Hardware Installation page 481

• You need a helper to assist with removing the shelf assembly.
• The device must be powered down. See "Powering down a Multiservice
Switch" (page 391).
• Remove a device only after you have removed the power supplies,
processor cards, and cooling unit as shown by the figure "Exploded view
of power supplies in a Multiservice Switch 7460" (page 473).
Procedure steps
1 If the shelf used an external alarm, disconnect the external alarm cable as
shown in the figure "External alarm connector on a Multiservice
Switch 7460" (page 504).
2 Unfasten the 10-mm (3/8-in.) nut on the shelf grounding cable stud at the
rear of the shelf assembly as shown in the figure "Grounding a
Multiservice Switch 7460 to the site ground window" (page 230).
3 Tape the grounding cable to the mounting apparatus so that it does not
get snagged by the shelf assembly when it is removed.
4 While one person holds the shelf assembly, have the other person
unfasten the eight 5/16-in. screws from the 2 mounting ears of the
assembly. Refer to the figure "Shelf assembly of a Multiservice
Switch 7460 removed from a rack" (page 483).
5 Pack all shelf components in their original packaging.
Multiservice Switch 7400 Hardware Installation, Maintenance, and Upgrade 6.1S2
Chapter 39 Hardware procedures 481