Nortel Passport 15000 Hardware Installation And Maintenance page 716

716 Chapter 17 Hardware procedures
Procedure steps
241-1501-240 5.2S2
1 At the rear of the shelf assembly, unplug the black-and-white power
cabling from all 4 PIMs on the left side of the shelf by pinching the tabs on
the connectors. Move the loose cable ends aside. Refer to the figure
"Location of the rear plug-in hardware" (page 717).
2 Unfasten the D-sub connectors on the alarm/BITS module, unplug them,
and move the loose cable ends aside.
3 At the front of the shelf assembly, open the 2 cable channel covers by
turning their medium slotted captive screws 1/4 turn counter-clockwise.
4 Remove all disconnected cabling from the cable channels and cable
management brackets that are fastened on top of the shelf assembly
mounting ears along the frame uprights or along the adapter brackets
used with a rack. Avoid tangling the clusters of cables.
5 Tie the loose cable ends aside so that the shelf assembly can be slid out
the front without snagging a cable.
6 Record the position and orientation of each cable management bracket
that overlaps a mounting ear of the shelf assembly so that they can be put
back the same way later.
7 Remove the thread-forming 10-mm (3/8-in.) hex-head screws of all
overlapping cable management brackets at the sides of the shelf
assembly and from the mounting ears. Start from the bottom screws on
both sides and work upwards. Put the screws aside for re-use.
When removing the last 2 screws, have the helpers grip the shelf at the
sidewalls where the cable channel openings are and at the top cross
member of the shelf assembly.
CAUTION
Risk of equipment damage
Do not grip any plastic parts as a means to supporting the
weight of the unfastened shelf assembly. These parts will
break, especially the card tracks (rails) or cable guides.
8 Pull the shelf assembly straight out and away from the frame or rack.
Change your grip as required to the bottom of the shelf assembly to
support its weight.
9 Put the shelf assembly into the container of the replacement shelf
assembly and add the packing material as it was before.