Raymarine C80 Chartplotted with 300 DSM issue?

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum Paulus,

The amber LED is indicative of a failure to sense the transducer as indicated within the Status LED table found on page 26 of the DSM30/300's Owner's Manual. It would be recommended that:
1. the power circuit supplying power to the DSM be switched OFF
2. the transducer's plug be unplugged and inspected for signs of corrosion on the contacts ... if corrosion is found, then the transducer and/or DSM may need to be replaced should the contacts be unable to be adequately / safely cleaned
3. the transducer's plug be inspected to ensure that its locking ring is installed ... if not a new locking ring should be ordered from Gemeco, Inc. (Airmar’s US distributor (803 693 0777)) and that it be installed.
4. the transducer's cable be inspected from the plug to the transducer to ensure that it has neither been modified nor damaged ... if damage or modification is found, then the transducer should be replaced
5. that the transducer's plug then be reconnected to the DSM, ensuring that its locking ring has been rotated into the locked position
6. the power circuit supplying power to the DSM be switched ON
7. that the system be tested again.

Should the problem persist then the problem would be rooted in either the transducer or the DSM. Fault isolation would typically be performed by testing the DSM with another compatible transducers which had been connected to the DSM in a temporary manner and then simply suspended over the side of the hull or, in the case of fiberglass hulls less than 1" thick, placed atop a water-filled ziplock bag resting on the inside of the hull. Should the problem persist with the test transducer, then the DSM would need to be sent to Raymarine’s Product Repair Center to be bench checked / serviced or that it replaced with an operational second hand DSM. Raymarine no longer produces DSMs having a hsb2 communications interface ... unlike later models of MFDs, the C-Series Classic MFDs were designed to communicate with a DSM exclusively via hsb2 communications.