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Installing the Control Unit
.
Follow these steps to replace a module:
1.
2.
3.
4.
5.
6.
7.
8.
9.
Busy-out or reset the module. (Busy-out is recommended.)
Label all cords (if they haven’t been labeled already) and then unplug
them from the module.
For information on labeling trunk and extension cords, see Chapters 3
and 4.
For instructions on checking poorly labeled wiring, see “Checking
Poorly Labeled Wiring” in Chapter 3.
Run a demand test by entering the test mode.
Remove the module as described previously, under “Removing a
Module.”
Inspect the module for visible damage.
Insert the new module as shown in Figure 2-14.
Restore the module as described in Chapter 7.
Plug-in the trunk and extension cords.
Attach a tag, error printout, and any information that will help identify
any visible problems or failure symptoms.
Installing the Modules
2-61