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OM20 Universal Outdoor Modem
Maintenance and Troubleshooting
This section discusses unit maintenance and troubleshooting for the OM20 Universal Satellite
Modem.
The OM20 contains a Lithium Battery.
the battery is incorrectly replaced.
equivalent type recommended by the manufacturer.
batteries in accordance with local and national regulations.
7.0
Periodic Maintenance
There is no external fuse on the OM20. The fuse is located on the power supply assembly inside
the case, and replacement is not intended in the field.
7.0.1 Clock Adjustment
The OM20 allows for internal VCO speed adjustment from the GUI. Clock adjustment should be
performed only when an internal clock source has insufficient accuracy for the custom modem
application.
7.1
Troubleshooting
Should a unit be suspected of a defect in field operations after all interface signals are verified,
the correct procedure is to replace the unit with another known working OM20. If this does not
cure the problem, wiring or power should be suspect. The following is a brief list of possible
problems that could be caused by failures of the modem or by improper setup and configuration
for the type of service. The list is arranged by possible symptoms exhibited by the OM20 modem.
Symptom
The Modem will not acquire the
incoming carrier:
The Async Port is not
configured correctly.
TM116 – Rev. 1.2
DANGER OF EXPLOSION
Replace only with the same or
Possible Cause
There is an improper receive input to modem.
The Receive Carrier Level is too low.
The Receive Carrier Frequency is outside of the acquisition
range.
The Transmit Carrier is incompatible.
Modem is in Test Mode.
The switches may not be set in the correct positions.
Maintenance and Troubleshooting
exists if
Dispose of used
7
7-1
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