Comtech EF Data SLM-5650A - Manual (Page 323)

A–1
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
System checkout entails following the test instructions provided for the interface 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.
This equipment contains parts and assemblies sensitive to damage by ESD.
Use ESD precautionary procedures when touching, removing, or inserting
PCBs.