Module Problems - AT&T MERLIN LEGEND Communications System Release 2.0 Maintenance And Troubleshooting Manual

Control Unit Problems

Module Problems

If you suspect that a module is faulty, do the following:
1. If you want to identify the cause of module errors, run the module tests
described in this section.
2. To determine whether the module is faulty, replace it with a module of
the same type. If the errors cease, the problem is solved.
Module Tests
The module tests in this chapter identify the cause of module malfunctions.
After each module test, record any errors on the repair tag that will be
shipped with the faulty module. If the module is sent to repair personnel, this
will help them troubleshoot the cause of malfunction.
Read through the following subsection, "Module Test Process," before
running any module test.
NOTE:
Running module tests requires that the module being tested be removed
from service. Because your customer depends
module tests during off hours if possible. If not,
required for each module's downtime whenever
Module Test Process
Figure 4-4 diagrams the module test process. Refer to this figure and the text
that follows for the recommended approach to module testing.
Module Problems
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on this service, run
minimize the time
possible.