AT&T MERLIN LEGEND Installation & Maintenance Manual page 126

Installation
Shut the Power Off
During installation you may need to shut the power off for
troubleshooting or because you need to add something to the
carrier.
C A U T I O N
Follow
the steps in exact sequence.
1. Turn off the power at the power supply module in the basic
carrier.
Turn off the power at the power supply modules in the
2.
expansion carriers.
3. Unplug any auxiliary power units. Because the power supply
modules are already off, the sequence for removing auxiliary
power cords is not important.
Install the Control Unit Housing
The control unit housing is a plastic cover to protect the CU
modules. One front panel is used for each carrier. Follow these
steps to install the control unit housing (see Figure 22):
1. Lay the front panel(s) face down.
2. If more than one carrier is being housed, slide the front
panels together so that the semicircles on the inside line up.
Add both side panels to the front panel(s) by sliding the front
3.
panel(s) into the slots on the side panels so that the
semicircles on the inside line up.
4. Pick up the whole housing and place it on the CU.
a. Line up the wire clips attached to the carrier with the
recesses on the outside of the side panels.
b. Push back until the clips hook over the tabs and rest in the
recesses.
3-18 The Control Unit