Nortel Networks 400 4.0, BCM200 manual Troubleshooting cooling fans

334Chapter 25 Replacing or installing a cooling fan

Installing an expansion unit fan

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: Ensure the label of the new fan faces the back wall of the BCM expansion unit chassis. Airflow is out of the chassis as indicated by the arrows imprinted on the fan.

To install an expansion unit fan

1Place the fan in the expansion unit so that the label faces the back wall of the unit.

2Align the screw holes in the fan with the screw holes in the expansion unit and attach the fan.

3Connect the fan power supply cable to the hub board.

4Replace the cover.

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.

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).

Troubleshooting cooling fans

There are three LEDs on the front of the BCM base function tray and one on the front of the expansion unit used to assess fan functionality. Table 84 describes the possible states of the fan and temperature LEDs.

Table 84 Fan and temperature LEDs on the base function tray

LED Label	Description	Green LED On	Red LED On (Only)
	Temperature	Temperature is below	Temperature is in alarm status.
		threshold.	Possible fans failure.
	Fans	All installed fans are working.	There is a problem with a minimum of
			one fan.
	Power	All components are working.	Component failure.

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