So I just picked this unit up used and installed it at the ramp this morning. I'm pretty sure it is not working right, but I need to see if we can tell if it is the transducer or the unit itself.
For a little while it appeared to be reading the bottom but it did not appear to be imaging the bottom as you would see on Humminbird's website etc. Basically there was very little detail to it no matter how I adjusted the settings. It also appeared that the standard sonar returns were just like a "broken record" playback even though I was moving.
Then it got to where it was giving me erroneous depth readings vs my console unit. If I brought the unit out of the water and dropped it back in it would "settle down". But after a few minutes the depth would start flashing again and start bouncing around. It didn't do all of this until later in the trip today.
Also, I know I was floating over trees and rocks and it more or less showed me a flat bottom where I was at. AND when I would kick on the trolling motor to move the depth would go up real high and there would be interference on the display until I let off of the switch.
I didn't notice this problem until we got off the water but the transducer wire has a small cut in it near the transducer head itself, which is also against the trolling motor motor itself. It doesn't appear that any wire is damaged but I can see a foil shield that is not intact. Would this cause weird readings? I've got some stuff I can seal the cut with if that would fix the problem otherwise I assume the only other way would be to replace the transducer? Or could it be a control unit problem? I've never had ANY issue with my other Humminbird and am leaning towards a bad transducer or the cut is causing problems. Help?