Chapter 25 Replacing or installing a cooling fan 331BCM200/400 4.0 Installation and Maintenance Guide5 Restore the BCM system to operation. For details, refer to “Restarting the system aftermaintenance” on page 234.The BCM system starts up when you connect the AC power cord. The start-up process takesseveral 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 blowsair away from the main unit. If you are testing two fans, cover one fan at a time with yourhand.b If the fan exhaust air flow is incorrect, remove the cooling fan (see “Removing a BCM400cooling fan” on page 326) and reinstall the fan in the correct position (this procedure).Removing a BCM200 cooling fanUse this procedure to remove the cooling fan in a BCM200 main unit.To remove a BCM200 cooling fan1 Shut down the system (see “Performing a system shutdown” on page 233).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 metalsurface.4 Remove the top cover from the main unit (see “Installing the main unit top cover” on page248).5 Disconnect the I/O card fan cable connection (see Figure 185 on page 332).Warning: Protect the hardware components against damage from electrostatic discharge.Always wear a grounded wrist strap before you handle components. Always place thecomponents in a static-free container.
