User's Manual

332 Chapter 25 Replacing or installing a cooling fan
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7 Test the direction of the fan exhaust air flow to determine if the fan is correctly installed.
a Hold a piece of paper or your hand close to the fan exhaust. A correctly installed fan blows
air away from the main unit.
b If the fan exhaust air flow is incorrect, remove the cooling fan (see “Removing a BCM200
cooling fan” on page 329) and reinstall the fan in the correct orientation (this procedure).
Removing an expansion unit fan
The BCM expansion unit comes either with one fan or a redundant fan set. The single-fan unit is
not upgradeable.
To remove an expansion unit fan
1 Shut down the system (see “Performing a system shutdown” on page 231).
2 Disconnect the fan power cable from the hub card.
3 Locate the screws that fasten the fan casing to the expansion unit back wall and remove them.
Refer to Figure 187 on page 333 and Figure 188 on page 333.
4 Remove the four screws (or snap rivets) that hold the fan to the expansion unit.
5 Lift the failed fan out of the expansion unit.
Warning: Protect the hardware components against damage from electrostatic discharge.
Always wear a grounded wrist strap before you handle components. Always place the
components in a static-free container.
Note: If the unit has redundant fans, each fan has a connector on the hub board.