Nortel Networks BCM50 manual Preparing the system for maintenance, Removing the power supply

170Chapter 20 Replacing a power supply

Preparing the system for maintenance

In most cases, if the power supply for the main unit is faulty, the system will already be shut down. If this is the case, proceed to “Removing the power supply”. If you are replacing the expansion unit power supply, or the system is still operating, perform the following procedure:

To shut down the system

1Check for a recent backup of the BCM50 system programming.

2If there is no recent backup, use Element Manager to back up the system data. For information about backing up the system data, refer to the BCM50 Administration Guide (N0016868).

3In Element Manager, from the Administration tab, click the Utilities folder to expand it.

4Select Reset from the Utilities folder.

5Click Reboot BCM50 System to reboot the system. The BCM50 system begins the shutdown process.

6Unplug the main unit, when the status and power LEDs go from solid green to flashing orange.

7Continue to the next step, “Removing the power supply”.

Removing the power supply

Before you disconnect the power supply, read the warnings about connecting network lines in “Wiring warnings” on page 103.

To remove the power supply

1Remove the telephony and data networking lines from the BCM50 units. These lines include:

•the RJ-21 telephony connector on the main unit

•the ADSL line in the WAN port on a BCM50a main unit

•any analog telephone lines in the media bay modules (MBM) in the expansion units

•any digital telephone lines in the MBMs in the expansion units

2Rotate the power supply retention clip to free the power supply cord.

3Remove the power supply cord from the BCM50 unit.

Warning: Leakage currents

You must disconnect the telephony and data networking cables from the system before disconnecting the power cord from a grounded outlet.

4Remove the power supply cord from the ac wall outlet.

If your system has a UPS, remove the power supply cord from the UPS socket.

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