Replacing The Fan Assembly - Cisco BPX 8620 Installation And Configuration Manual

Chapter 29 Replacing Parts
Screw in the thumb-screw on the right side of the power supply assembly until it is finger tight.
Step 5
Step 6 Flip the retaining bracket up and tighten its thumbscrew.
Reinstall the Air Intake Grille and press firmly on the top, center of the Air Intake Grille until the latch
Step 7
snaps into place.
Check the status and output voltage of the replacement power supply using the dspasm command. Make
Step 8
sure the status is OK and the output voltage is 48V.

Replacing the Fan Assembly

The Fan Assembly provides the primary cooling for the BPX switch and is located at the top, rear of the
BPX switch cabinet.
There are three fans in the Fan Assembly. The fan on the right (number 1) and the one on the left (number
3) can be changed out individually with very little effort or interruption in the operation of the node.
However, to replace the fan in the middle (number 2) you must first power down the node and remove
the Fan Assembly.
Caution You must work quickly but carefully to prevent heat buildup in the node, which could damage the
cards.
To replace fan number 1 or number 3 in the Fan Assembly, use the following procedure:
Use the dspasm command to check the status of the three fans.
Step 1
From the rear of the BPX switch, visually check that the fan(s) is indeed not turning or turning slowly.
Step 2
From the back of the cabinet, unplug the small fan power cord from its appropriate receptacle on the Fan
Step 3
Assembly.
Remove the two screws holding the fan and the fan shield to the-fan housing. Be careful not to drop the
Step 4
hardware into the rear of the cabinet.
Remove the fan. Replace the fan in reverse order. Use the existing fan grille.
Step 5
To replace fan number 2 requires powering down the node and replacing the whole Fan Assembly. Under
normal ambient room temperatures, this can be scheduled for the next available quiet time.
To replace fan number 2, use the following procedure:
Use the dspasm command to check the status of the three fans.
Step 1
From the rear of the BPX switch, visually check that fan number 2 is not turning or turning slowly.
Step 2
At the rear of the BPX switch, turn the circuit breakers OFF to power down the node.
Step 3
Step 4 Loosen the eight captive screws holding the Fan Assembly in place.
With one hand, pull the Fan Assembly back just far enough to gain access to the Fan Assembly power
Step 5
cord. This cord connects to the Fan Assembly to the backplane.
Unplug the power cord and remove the Fan Assembly.
Step 6
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
Cisco BPX 8600 Series Installation and Configuration
Replacing the Fan Assembly
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