Replacing basic chassis components Standard 1.10
118 CallPilot
Replacing the four-fan assembly
The four-fan cooling assembly is not hot-swappable. You must power
down the server and disconnect it from the power supply.

When to replace the cooling fan assembly

When one or more of the four cooling fans is not turning, the remaining
fans rotate faster to maintain the same volume of air flow through the
chassis. The hum of a cooling fan rotating faster is both louder and
higher in pitch than normal and indicates that the assembly must be
replaced. You cannot replace just one fan in the assembly.

To replace the four-fan assembly

1Power down the server, unplug all peripheral devices and Ethernet
cables, and disconnect the AC power.
2Attach the ESD strap to your wrist and attach the other end to a
known grounded connection.
3Remove the chassis cover. Refer to “Removing and replacing the
server cover” on page 108 for instructions.
4Remove the processor air duct. Refer to “Removing and replacing
the processor air duct” on page 110 for instructions.
5Disconnect the fan connectors (A) from the front panel I/O board.
Make of note of the order in which the fans are plugged into the
board.