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Maintenance
5.2
Fault Isolation
The modem's design allows a technician to repair a faulty modem on location.
CAUTIO N
The fault isolation procedure lists the following categories of faults or alarms.
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•
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Note: Each fault or alarm category includes possible problems and the appropriate action
required to repair the modem.
If any of the troubleshooting procedures mentioned earlier in this chapter do not isolate
the problem, and Comtech EFData Customer Support assistance is necessary, have the
following information available for the representative:
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5.2.1
System Faults/Alarms
System faults are reported in the "Faults/Alarms " menu, and stored faults are reported in
the "Stored Flts/Alms" menu. Refer to
appropriate action for repairing the modem, refer to Table 5-2 and the list of possible
problems.
5–8
This equipment contains parts and assemblies sensitive to damage by ESD.
Use ESD precautionary procedures when touching, removing, or inserting
PCBs.
Modulator
Demodulator
Transmit Interface
Receive Interface
Common Equipment
Backward Alarms
Modem configuration. Modem configuration includes the modulator,
demodulator, interface, or local AUPC sections.
Faults (active or stored).
Chapter 3
for more information. To determine the
SDM-300A Satellite Modem
Rev. 4
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