Telephone System Installation and Maintenance Guide

192 Chapter 24 Replacing an internal component
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5 Lift the main unit off of the rackmount shelf and set it on a flat, clean, static-free surface.
6 Continue to the next step, “Opening the main unit case”.
To remove a wallmounted main unit
1 Ensure that all the cables are removed from the main unit.
If they are not, refer to “To disconnect the cables” on page 191.
2 Lift the main unit up until it disengages from the clips on the wallmount bracket.
3 Pull the main unit out and away from the wallmount bracket.
4 Set the main unit on a flat, clean, static-free surface.
5 Continue to the next step, “Opening the main unit case”.
To remove a desktop-mounted main unit
1 Ensure that all the cables are removed from the main unit.
If they are not, refer to “To disconnect the cables” on page 191.
2 If 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.
3 Lift the main unit off of the desktop and set it on a flat, clean, static-free surface.
4 Continue to the next step, “Opening the main unit case”.
Opening the main unit case
This procedure assumes that you intend to perform maintenance activities. Do not operate the
main unit with the cover removed.
To open the main unit case
1 Attach one end of a grounding strap to your wrist and the other end to a grounded metal
surface.
2 Turn the main unit over so that the bottom of the unit is facing up.
Danger: Electrical shock warning.
Disconnect the power cord, telephone cables and network cables before opening the
BCM50 main unit.