[CA] ES128 transducer issue?

[Chuck - Raymarine - Moderator]

Welcome back to the Raymarine Forum Bill,

A thin bottom line would typically be indicative of a very hard bottom. However, it would be expected that the High CHIRP Sonar Channel would also produce a similar image ... which is most definitely not the case per your screen snapshot. Should the vessel be a sailing vessel and should this image have been captured while the vessel was operating on a level keel then this would indeed indicate a DownVision sonar problem. Both the temperature and DownVision problems reported may be indicative of a failure of the transducer or a failure of the MFD's fishfinder processing circuitry. These problems would typically be fault isolated by testing the MFD with a compatible DownVision transducer which was simply suspended over the side of the hull while the vessel was stationary to test the DownVision circuitry. The temperature problem may be tested with the test transducer out of the water, where it should report the surrounding air temperature. If installed by a Certified Raymarine Installer and should the equipment still be within the warranty, then it would be recommended that your Certified Raymarine Installer be contacted to fault isolate and then correct the problem. Alternatively, the MFD may be sent to Raymarine’s Product Repair Center to be bench checked / serviced.