Replacing The Temperature Sensing Unit; Replacing Card Slot And Fan Fuses On The System Backplane - Cisco BPX-BXM-155-8DX Installation And Configuration Manual

Replacing the Fan Assembly
Step 5 With one hand, pull the Fan Assembly back just far enough to gain access to the Fan Assembly power
cord. This cord connects to the Fan Assembly to the backplane.
Step 6 Unplug the power cord and remove the Fan Assembly.
Step 7 Plug the power cord in the replacement Fan Assembly into the backplane connector.
Install the replacement Fan Assembly.
Step 8
Tighten the eight screws holding the Fan Assembly in place.
Step 9

Replacing the Temperature Sensing Unit

The temperature sensing unit is located on the ASM card. If the temperature indication displayed by
using the dspasm command does not appear to be correct, try a replacement ASM card.

Replacing Card Slot and Fan Fuses on the System Backplane

There is a separate fuse provided on the System Backplane for each card slot. These fuses are numbered
F4 through F18, corresponding to card slots F15 down through F1 (see Figure 30-6).
There are three separate fan fuses provided on the System Backplane. These fuses are numbered F1
through F3, corresponding to Fans 1 through 3 (see Figure 30-6).
Warning For both personnel safety and to prevent equipment damage, power down the BPX
switch before replacing fan fuses F1 through F3, or card slot fuses F4 through F18 on the
System Backplane. For continued protection against risk of fire, replace only with same
type and rating of fuse.
Backplane fuses rarely need replacement. Backplane fuses are intended to prevent catastrophic damage
to the backplane in the event of accidental shorting of -48VDC on the backplane to chassis ground. This
type of event could be caused by bent backplane pins, inadvertent contact of conductive elements (EMI
Cans, EMI Gaskets, and so on.) to power pins, or (in the case of a fan fuse) a pinched wire harness.
These fuses are located in sockets on the backplane and are therefore not readily accessible. A special
tool and a special set of instructions are required for fuse replacement. It is recommended that only
factory-trained personnel perform the procedure. Contact Customer Service for further information.
Cisco BPX 8600 Series Installation and Configuration
30-10
Chapter 30
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
Replacing Parts