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  Diagnosing SONAR Problem

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Author Topic:   Diagnosing SONAR Problem
Kencvit posted 08-30-2011 11:31 PM ET (US)   Profile for Kencvit   Send Email to Kencvit  
I have a six-year-old Navman 4380 fish finder. I rarely have used it for [finding fish]. It is mostly set to the DATA screen which shows me depth, water tempeature, and Voltage. Last fall the water temperature began to show erratic numbers. It now reads "_ _ _". The depth reading has sometimes at speed displayed "_ _._". [I] believe that is due to turbulence and the location of the transducer. Otherwise the depth has always shown and appeared accurate.

For the last weeks the depth has only displayed intermittently regardless of speed and now is reading blank. From what I can see the transducer is clear of debris. Would these symptoms suggest transducer failure? Or, is the unit itself dying? Should I replace the transducer? I believe Navman is no longer sold in North America. I have not yet found a source for a replacement transducer.

The unit is flush mounted in the console. I could replace it but since I use it primarily as a sounder-only it would be nice to find an easy fix. Also, I would like to avoid replacing the ($100) transducer only to find that the problem is the unit. Any suggestions would be appreciated. Thanks--Ken

jimh posted 08-31-2011 11:50 AM ET (US)     Profile for jimh  Send Email to jimh     
The best technique for resolving which component, transducer or head unit, was responsible for the problem would be to temporarily substitute known-good units for each, one at a time. If you could find another boater near you who had the same device or even the same transducer, you might be able to temporarily test your head unit or transducer with his gear. I realize this suggestion may be impractical.
Kencvit posted 08-31-2011 01:12 PM ET (US)     Profile for Kencvit  Send Email to Kencvit     
A good idea, but impractical for me. I don`t know anybody with Navman. The Navman 4380 was installed by the dealer; they included it in the deal. They are in Minnesota. I`m seven-hours north in Canada.

I believe at the time, Brunswick had a share in Navman and were promoting their units in Boston Whaler boats. I will try calling [Boston Whaler] parts department in case they still have a few parts around for these units. But I think I will likely have to replace the whole unit and transducer with another brand. I was hoping to finish the season with the old one and have the off-season to decide on and install a new one.

Jefecinco posted 09-01-2011 04:43 PM ET (US)     Profile for Jefecinco  Send Email to Jefecinco     
Most transducers are made by AIRMAR. They may be able to advise you. It is also probable the model of your transducer is used with many different manufacturers sounders.

Butch

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