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A.3
Fault Isolation
The design of the modem allows for removal and replacement of some faulty components in the
field. The optional plug-in interface can be removed from the modem through the rear panel,
without requiring special tools. The power supply can be replaced if the top cover is removed.
This equipment contains parts and assemblies sensitive to damage by ESD.
Use ESD precautionary procedures when touching, removing, or inserting
PCBs.
The fault monitoring capability of the modem assists the operator in fault isolation. If possible,
replace the faulty PCB and return the damaged board to the Comtech EF Data Customer Support
Department for repair. If not, return the complete modem.
The fault isolation procedure lists the following categories of faults or alarms:
•
Modulator
•
Demodulator
•
Transmit Interface
•
Receive Interface
•
Unit (Common Equipment)
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 appendix do not isolate the
problem and Comtech EF Data Customer Support assistance is necessary, have the following
information available for the representative:
•
Modem configuration. Modem configuration includes the modulator, demodulator, interface,
or local AUPC sections.
•
Faults (active or stored).
Appendix A
A–10
SLM-5650B Satellite Modem
Revision 2
MN-SLM-5650B
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