Nortel Networks 400 4.0 manual Removing a BCM200 cooling fan, To remove a BCM200 cooling fan

Chapter 25 Replacing or installing a cooling fan 329

5Restore the BCM system to operation. For details, refer to “Restarting the system after maintenance” on page 232.

The BCM system starts up when you connect the AC power cord. The start-up process takes several minutes to complete.

6Test 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. If you are testing two fans, cover one fan at a time with your hand.

b If the fan exhaust air flow is incorrect, remove the cooling fan (see “Removing a BCM400 cooling fan” on page 324) and reinstall the fan in the correct position (this procedure).

Removing a BCM200 cooling fan

Use this procedure to remove the cooling fan in a BCM200 main 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.

To remove a BCM200 cooling fan

1Shut down the system (see “Performing a system shutdown” on page 231).

2Disconnect the BCM system from the AC power outlet.

3Attach one end of the grounding strap to your wrist and the other end to a grounded metal surface.

4Remove the top cover from the main unit (see “Installing the main unit top cover” on page 246).

5Disconnect the I/O card fan cable connection (see Figure 184 on page 330).

BCM200/400 4.0 Installation and Maintenance Guide