Failing depth sounder ouput

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum Angelo,

It is recommended that you verify that within the Fishfinder Settings of the Fishfinder application that you have configured the Transducer settings to specify that the sounder module has been interfaced to a B744V/V744VL transducer. If so and should the problem persist, then it is recommended that it be verified that the transducer cable has not been modified or damaged and that you take a photo of the transducer's tag (located on the plug end of the transducer's cable) and attach it to your response to this thread. Please additionally specify whether the problem is observed when operating in deep water when the vessel is drifting with the engine(s) and all other electrical circuits switched OFF. If so, then it would be recommended that the transducer be tested. Should the transducer be found to pass testing, then it would be recommended that the CP370 be replaced or sent to Raymarine’s Product Repair Center to be bench checked / serviced.