Replacing The Fan Assembly - Cisco BPX-BXM-155-8DX Installation And Configuration Manual

Chapter 30 Replacing Parts
Step 4 When the power supply is completely seated, the spring-loaded pin will snap into place to assure that
the power supply has mated with its connector.
Step 5 Screw in the thumb-screw on the right side of the power supply assembly until it is finger tight.
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.
Step 8
Make 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 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
Step 3 From the back of the cabinet, unplug the small fan power cord from its appropriate receptacle on the
Fan Assembly.
Step 4 Remove the two screws holding the fan and the fan shield to the-fan housing. Be careful not to drop the
hardware into the rear of the cabinet.
Step 5 Remove the fan. Replace the fan in reverse order. Use the existing fan grille.
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 dspasm command to check the status of the three fans.
Step 1
Step 2 From the rear of the BPX switch, visually check that fan number 2 is not turning or turning slowly.
Step 3 At the rear of the BPX switch, turn the circuit breakers OFF to power down the node.
Step 4 Loosen the eight captive screws holding the Fan Assembly in place.
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
Cisco BPX 8600 Series Installation and Configuration
Replacing the Fan Assembly
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