Troubleshooting and Maintenance
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5.3.2.4 Excessive Impacts
Though the FS Trawl Unit is designed for the harsh fishing environment, excessive impacts
to the trawl unit or the individual components may damage them.
Excessive impacts to the trawl unit usually result in physical damage to this housing.
However with the newer, more durable urethane housing, excessive impacts to the trawl
unit may NOT cause physical damage to either the trawl housing or the exterior of the
individual electronic units, but may result in damage to the electronics.
NOTE: As with all electronics, careful handling of the trawl unit will reduce the
likelihood of FS failures.
5.3.2.5 Corrosion
If on examination corrosion has occurred to the sonar head metal parts these areas should
be cleaned well and the area sealed with paint or a sealant to prevent continuation of the
corrosion in this area.
WARNING: If corrosion is allowed to continue, flooding of the unit may result.
5.3.2.6 Shaft or Transducer Damage
The transducer and shaft are protected by a flexible dome and should be inspected for
damage. If the transducer dome has experienced an impact this could bend the shaft and
eventually allow water into the housing. If the shaft is bent the unit should be returned to a
qualified Simrad service facility for replacement of the shaft seal assembly.
NOTE: If the sonar head is correctly installed in the trawl unit, with proper
placement of the locating block, then damage to the transducer and shaft
should not occur.
5.3.3 FA 701 Catch and PI Sensors
The catch sensors are relatively maintenance free except to charge the batteries. Refer to
your Simrad FA701 and or PI 32 Catch sensors operator and installation manual for the
information on both the charging of the catch sensors and the proper mounting of these
sensors on the trawl.
5.3.4 Winch Slip-Rings and Trawl Cable
The winch slip-rings and trawl cable are the umbilical cord between the processor unit and
trawl unit electronics, and are critical to the proper operation of the Simrad FS Trawl
Monitoring system. Damaged, worn or poorly maintained cable or slip-rings will degrade
the performance of the system and may cause or lead to a complete system failure.
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