Section 7: Fault Isolation - SeaSpace TeraScan 1.5M Operation And Maintenance Manual

Section 7: Fault Isolation

7.1 Causes of Loss of Pass Data.............................................................................................................. 90
7.1.1 Gradual or Temporary Loss of Data...................................................................................... 90
7.1.2 Complete Loss of Data ............................................................................................................ 90
7.1.3 No Data Received After Setup of Antenna .......................................................................... 91
7.2 Antenna Subsystem Diagnostics...................................................................................................... 91
7.2.1 Test Environment ..................................................................................................................... 91
7.2.2 Test Equipment......................................................................................................................... 92
7.2.3 Parts Identification................................................................................................................... 92
7.2.4 Positioner-Related Faults ........................................................................................................ 92
7.2.4.1 Antenna Controller (PCU)............................................................................................ 93
7.2.4.2 Tracking Positioner ........................................................................................................ 94
7.2.4.3 Tracking Positioner-Elevation Torque...................................................................... 97
7.2.4.4 Sea-Going Antenna with NMEA 0183 Input-Azimuth Mispositioned............... 97
7.2.5 RF-Related Faults ..................................................................................................................... 98
7.2.5.1 L/S-Band Downconverter ............................................................................................ 98
7.2.6 Time-Related Faults ................................................................................................................. 98
7.2.6.1 Check/reset clock .......................................................................................................... 98
7.2.6.2 Check GPS with sunclock and whereami .................................................................. 98
TeraScan 1.5m Polar Satellite Tracking Antenna O & M Manual 89