SOURCE: Lowrance 3500 Digital Depth Guage flashed 0.5 continuously
If you have a glue in style transducer, be sure that the fluid has not leaked out of the cup. Otherwise, there really is no effective way to troubleshoot those without having known good parts to swap and try. If the cup is empty, it will need to be resealed with silicone (100% silicone) and then refilled with mineral oil.
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