Nortel Networks BCM50 manual Removing the main unit

Chapter 24 Replacing an internal component 191

To disconnect the cables

1Remove the 25-pair cable from the RJ-21 telephony connector on the front of the BCM50 main unit.

2Remove the Ethernet cable from the LAN port.

3If the main unit is a BCM50a or BCM50e, remove the Ethernet cable or ADSL line from the WAN port and the Ethernet cables from the Router card LAN ports.

4Remove the expansion cables or LAN cables from the Expansion ports on the BCM50 main unit. For the expansion cables, make sure you mark the cables with the number of the port to which they were connected.

5If the system uses the external Music Source port, remove the cable from the Music Source port.

6If the system uses a UPS, remove the USB cable from the USB port.

7Rotate the power supply retention clip to free the power supply cord.

8Remove the power supply cord from the BCM50 main 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.

9Continue to the next step, “Removing the main unit”.

Removing the main unit

The method you use to remove the main unit depends on how the unit is mounted. Use one of the following procedures to remove the BCM50 main unit:

•“To remove a rackmounted main unit”

•“To remove a wallmounted main unit” on page 192

•“To remove a desktop-mounted main unit” on page 192

To remove a rackmounted main unit

1Ensure that all the cables are removed from the main unit. If they are not, refer to “To disconnect the cables”.

2If a unit is mounted on top of the main unit, slide that unit forward until it disengages from the clips on the main unit. Lift the unit off of the top of the main unit.

3If the main unit has been secured to the rackmount shelf with screws, remove these screws from the bottom of the rackmount shelf.

4Slide the main unit forward until is disengages from the clips on the rackmount shelf.

BCM50 Installation and Maintenance Guide