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Garmin 1040xs / B75M Transducer = Problem

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Garmin 1040xs / B75M Transducer = Problem

Old 09-29-2018, 11:16 AM
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Default Garmin 1040xs / B75M Transducer = Problem

I've got a Garmin 1040xs paired with a B75M bronze thru hull transducer on a Ameracat 27. The sonar had been working very well in all regards until in the middle of a fishing trip several weeks back it quit reading bottom. I was able to get an extremely faint return off the bottom in shallow water but not even enough that it would register the depth in the upper corner of the display.

I call Garmin Tech Support and went through all the various trouble shooting steps including software updates, returning the unit to factory default settings, etc. Nothing worked. Finally they asked me to go purchase an inexpensive plastic transom mount transducer, plug it into the head unit and drop it over the side to see if that worked. I followed those steps and sure enough I was getting a good image on the sonar and reading bottom just fined.

Based on that they determined my B75M transducer was bad and I purchased a new one ($800) and had it installed. I just got the boat back and although the sonar is able to mark bottom a idle speed the return is not nearly as good as it use to be when everything was functioning properly. The bottom line looks "soft" if that makes sense and the unit will not read bottom at cruise speed and goes in and out at anything over idle.

I've gone through the sonar set up functions and everything looks ok but the performance is just not what it should be.
Any ideas as to what could be going on? Bad head unit? How can I tell without buying another?

Old 09-29-2018, 11:30 AM
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You need to find a dealer with a TDT1000 transducer tester.
Old 01-13-2019, 07:11 PM
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Did you ever figure anything out with this problem.

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