Nortel Networks BCM200/400 - Manual (Page 337)

Chapter 25 Replacing or installing a cooling fan 337
BCM200/400 4.0 Installation and Maintenance Guide
5 Restore the BCM system to operation. For details, refer to “Restarting the system after
maintenance” on page 240 .
The BCM system starts up when you connect the AC power cord. The start-up process takes
several minutes to complete.
6 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. 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 332 ) 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.
To remove a BCM200 cooling fan
1 Shut down the system (see “Performing a system shutdown” on page 239 ).
2 Disconnect the BCM system from the AC power outlet.
3 Attach one end of the grounding strap to your wrist and the other end to a grounded metal
surface.
4 Remove the top cover from the main unit (see “Installing the main unit top cover” on page
254 ).
5 Disconnect the I/O card fan cable connection (see Figure 185 on page 338 ).
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.