Specifications

9–1
Chapter 9. FAULT ISOLATION
9.1 Fault Isolation
The modem’s design allows a technician to repair a faulty modem on location.
CAUTION
This equipment contains parts and assemblies sensitive to damage by ESD.
Use ESD precautionary procedures when touching, removing, or inserting
PCBs.
The fault isolation procedure lists the following categories of faults or alarms.
• Modulator
• Demodulator
• Transmit Interface
• Receive Interface
• Common Equipment
• Backward Alarms
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 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).