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

Chapter 6. MAINTENANCE AND
This section discusses unit maintenance and troubleshooting for the Universal Satellite Modem.
The DMD20/DMD20 LBST contains a Lithium Battery.
DANGER OF EXPLOSION
only with the same or equivalent type recommended by the manufacturer.
WARNING
Dispose of used batteries in accordance with local and national regulations.
6.1

Periodic Maintenance

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

6.1.1 Clock Adjustment

The modem allows for 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.
6.2

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 unit. 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.
MN-DMD20-20LBST Revision 14
TROUBLESHOOTING
exists if the battery is incorrectly replaced. Replace
6–1