AT&T MERLIN LEGEND Release 3.1 Installation Manual page 74

Replacing a Module
To remove and replace a module, follow the steps below. Refer to
Figure 2-13.
1 Busy-out or reset the module. (Busy-out is recommended.)
2 Label all cords (if they are not labeled already) and then unplug them
from the module.
For information about labeling trunk and extension cords, see Chapter 3,
"Installing Telephones and Adjuncts" and Chapter 4, "Connecting the Control
Unit to the Network Interface." For instructions on checking unlabeled wiring,
see "Checking Unlabeled Wiring" in Chapter 3 of the Maintenance and
Troubleshooting guide.
3 Run a demand test by entering the test mode.
4 Power down the system, if required. See "Powering Down the System,"
later in this chapter, for instructions.
5 Remove the module by pushing up firmly on the tab at the bottom rear of
the module.
6 While holding up the tab, swing the bottom of the module towards you
and away from the carrier.
7 Lift up the module to disengage it from the rod on the top of the carrier.
8 Inspect the module for visible damage.
9 Insert the new module. See Figure 2–10.
10 Restore the module. Refer to Chapter 7, "Initializing and Testing the
System," for instructions.
11 Connect the trunk and extension cords.
12 Attach a tag, error printout, and any information that will help identify any
visible problems or failure symptoms.
Installing the Control Unit
2–41