974-24007001/5.0
VII
5 TROUBLESHOOTING AND MAINTENANCE ............................................... 74
5.1 Introduction ....................................................................................................... 74
5.2 System overview ............................................................................................... 74
5.3 Handling & maintenance .................................................................................. 74
5.3.1 Wheelhouse Electronics ................................................................................. 75
5.3.2 Trawl Unit ...................................................................................................... 75
5.3.2.1 Handling Tips .......................................................................................... 75
5.3.2.2 Maintenance Schedule............................................................................. 75
5.3.2.3 Connector Maintenance........................................................................... 76
5.3.2.4 Excessive Impacts ................................................................................... 77
5.3.2.5 Corrosion ................................................................................................. 77
5.3.2.6 Shaft or Transducer Damage ................................................................... 77
5.3.3 FA 701 Catch and PI Sensors ......................................................................... 77
5.3.4 Winch Slip-Rings and Trawl Cable ................................................................ 77
5.4 On-board System Troubleshooting ................................................................... 78
5.4.1 System Tools .................................................................................................. 78
5.4.2 Test Cable ....................................................................................................... 79
5.4.3 Power Supply Meter Readings ....................................................................... 79
5.4.4 Trawl Cable Gain............................................................................................ 80
5.4.5 Testing the Trawl Cable ................................................................................. 80
5.4.5.1 Trawl Cable Insulation Measurement ..................................................... 80
5.4.5.2 Closed Loop Resistance, Voltage and Current at Trawl Unit ................. 81
5.4.5.3 Test for Water Ingress in the Trawl Cable .............................................. 82
5.4.6 Telemetry Errors ............................................................................................. 83
5.4.7 Diagnostic Recordings .................................................................................... 83
5.4.8 System Info Page ............................................................................................ 83
5.4.9 Bitmap “Snapshots” Sonar Image .................................................................. 84
5.4.10 Manual Recordings ......................................................................................... 85
5.4.11 Automatic Recordings .................................................................................... 85
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