To Remove An Expansion Unit Fan; Removing An Expansion Unit Fan - Nortel BCM200 Installation And Maintenance Manual

334 Chapter 25 Replacing or installing a cooling fan
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
cooling fan" on page

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.
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.

To remove an expansion unit fan

1 Shut down the system (see
2
Disconnect the fan power cable from the hub card.
Note: If the unit has redundant fans, each fan has a connector on the hub board.
3
Locate the screws that fasten the fan casing to the expansion unit back wall and remove them.
Refer to Figure 188 on page 335
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.
N0060612 N0060612
331) and reinstall the fan in the correct orientation (this procedure).
"Performing a system shutdown" on page
and Figure 189 on page
"Removing a BCM200
233).
335.