Looking for some help with a Raytheon L470 fishfinder. Everything works on it except the speed, it did work one day and quick. I checked the speedo wheel and it spins freely. It looks to be some sort of infrared that the wheel spins in front of. Any help would be appreciated.
Electrical and electronic topics for small boats
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A paddle wheel speed sensor usually works on the principal of a moving magnet inducing a current into a stationary coil. I don’t recall any use of infrared light.