184 Chapter 23 Replacing an expansion unitN0027152 01N0027152 01Refer to the following sections for information on replacing a expansion unit:• “Disconnecting the cables”• “Removing the expansion unit”• “Removing the MBM” on page 186• “Inserting the MBM in the new expansion unit” on page 186• “Installing the new expansion unit” on page 187Disconnecting the cablesUse the following procedure to disconnect the expansion unit from the other equipment.To disconnect the expansion unit cables1 Use Element Manager to disable the media bay module (MBM) that is installed in theexpansion unit you are removing. Refer to the BCM50 Administration Guide (N0016868) formore information.2 Disconnect the expansion cable from the expansion port on the expansion unit.3 Disconnect the LAN cable from the LAN port on the expansion unit.4 Disconnect all of the telephone lines and extension cables from the MBM inserted in theexpansion unit.If there is more than one cable, mark the cables to identify the port from which they wereremoved.5 Rotate the power supply retention clip to free the power supply cord.6 Remove the power supply cord from the expansion unit.7 Continue with the next step, “Removing the expansion unit”.Removing the expansion unitThe method you use to remove the expansion unit depends on how the unit is mounted. Use one ofthe following procedures to remove the expansion unit:• “To remove a rackmounted expansion unit” on page 185• “To remove a wallmounted expansion unit” on page 185• “To remove a desktop-mounted expansion unit” on page 185Warning: Leakage currentsYou must disconnect the telephony and data networking cables from the system beforedisconnecting the power cord from a grounded outlet.
