Section 6 - Maintenance And Troubleshooting; Periodic Maintenance; Clock Adjustment; Troubleshooting - Radyne DMD20 Installation And Operation Manual

DMD20/DMD20 LBST Universal Satellite Modem
Maintenance and Troubleshooting
This section discusses unit maintenance and troubleshooting for the DMD20 Universal Satellite
Modem.
The DMD20 contains a Lithium Battery.
if the battery is incorrectly replaced.
equivalent type recommended by the manufacturer.
batteries in accordance with local and national regulations.

6.0 Periodic Maintenance

There is no external fuse on the DMD20. The fuse is located on the power supply assembly
inside the case, and replacement is not intended in the field.

6.0.1 Clock Adjustment

The DMD20 allows for internal VCO speed adjustment from the front panel. Clock adjustment
should be performed only when an internal clock source has insufficient accuracy for the custom
modem application.

6.1 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 DMD20. 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 modem.
TM103 – Rev. 2.5
Maintenance and Troubleshooting
DANGER OF EXPLOSION
Replace only with the same or
Dispose of used
6
exists
6-1