Chapter 24 Replacing an internal component 191BCM50 Installation and Maintenance GuideTo disconnect the cables1 Remove the 25-pair cable from the RJ-21 telephony connector on the front of the BCM50main unit.2 Remove the Ethernet cable from the LAN port.3 If the main unit is a BCM50a or BCM50e, remove the Ethernet cable or ADSL line from theWAN port and the Ethernet cables from the Router card LAN ports.4 Remove the expansion cables or LAN cables from the Expansion ports on the BCM50 mainunit. For the expansion cables, make sure you mark the cables with the number of the port towhich they were connected.5 If the system uses the external Music Source port, remove the cable from the Music Sourceport.6 If the system uses a UPS, remove the USB cable from the USB port.7 Rotate the power supply retention clip to free the power supply cord.8 Remove the power supply cord from the BCM50 main unit.9 Continue to the next step, “Removing the main unit”.Removing the main unitThe method you use to remove the main unit depends on how the unit is mounted. Use one of thefollowing 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 192To remove a rackmounted main unit1 Ensure that all the cables are removed from the main unit.If they are not, refer to “To disconnect the cables”.2 If a unit is mounted on top of the main unit, slide that unit forward until it disengages from theclips on the main unit. Lift the unit off of the top of the main unit.3 If the main unit has been secured to the rackmount shelf with screws, remove these screwsfrom the bottom of the rackmount shelf.4 Slide the main unit forward until is disengages from the clips on the rackmount shelf.Warning: Leakage currentsYou must disconnect the telephony and data networking cables from the systembefore disconnecting the power cord from a grounded outlet.
