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FS 20/25 Operators Manual 901-10037001/1.1
Maintenance and Troubleshooting Page 5.
7
Kongsberg Simrad Mesotech Ltd.
Port Coquitlam, BC - Canada
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.
With the older fiberglass trawl housing, excessive impacts to the trawl unit usually
resulted 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 or the sensor module’s
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. If corrosion is occurring
with connectors or connector socket inserts, have them replaced.
Caution!
If corrosion is allowed to continue, flooding of the unit may
result.
5.3.2.6 Shaft or Transducer Damage
The transducer and shaft should be inspected for damage. If the transducer has
experienced an impact, this could bend the shaft and eventually allow water into the
motor housing assembly. 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 both the sonar head and sensor module are correctly installed
in the trawl unit, with proper placement of retaining rings and
locating pin/bracket, then damage to the transducer and shaft
should never occur.
79


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