Comtech EF Data Vipersat SLM-5650A, Installation And Operation Manual

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SLM-5650A Satellite Modem
Revision 10
Appendix A A–1 MN-SLM-5650A
Appendix A. TROUBLESHOOTING
A.1 Overview
This appendix provides information pertaining to the SLM-5650A Satellite Modem’s system
checkout and fault isolation and identification.
A.2 System Checkout
This equipment contains parts and assemblies' sensitive to damage by ESD.
Use ESD precautionary procedures when touching, removing, or inserting
PCBs.
System checkout entails following the test instructions provided for the interface Printed Circuit
Board (PCB), modem PCB, Turbo PCB, and L-Band IF PCB. The instructions include tables and
test points for ensuring that the E
b
/N
0
, typical output spectrums, typical eye patterns, and
constellations are correct. If a test failure occurs, refer to the fault isolation checkout procedures
provided in this appendix.
This section provides instructions for checking the modem setup within the
earth station. Due to the complexity of the modem circuitry, the checkout
procedure should be used only as a basic guideline. More complicated
maintenance tests are beyond the scope of this manual.