Fault Isolation; Guidelines - Comtech EF Data SDM-9000 Installation And Operation Manual

SDM-9000 Satellite Modem

6.2 Fault Isolation

6.2.1 Guidelines

The modem has been designed so that a competent technician can repair a faulty modem
on location. All active circuits, except the power supply, can be removed from the
modem through the front panel without requiring special tools. The power supply can be
removed through the top cover with standard tools.
CAUTION
The fault monitoring capability of the modem is designed to assist the operator in
determining which PCB has failed. The faulty PCB can be removed and returned to
EFData for repair. Install a satisfactory spare PCB and continue with the operation.
The fault isolation procedure lists the following categories of faults or alarms. Each fault
or alarm category includes possible problems and the appropriate action required to
repair the modem.
•
•
•
•
•
•
If this troubleshooting procedure does not isolate the problem, and EFData Customer
Support assistance is necessary, have the following information available for the
representative:
•
•
Rev. 4
This equipment contains parts and assemblies sensitive to damage by ESD.
Use ESD precautionary procedures when touching, removing, or inserting
PCBs.
Modulator
Demodulator
TX Interface
RX Interface
Common Equipment
Backward Alarms
Modem configuration, including the modulator, demodulator, and interface
sections
Faults (active or stored) (refer to Table 6-4)
Maintenance
6–13