Question about Raymarine SeaTalk hs, 20m (E55052)

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Fishfinder problems I have a Koden cvs-821 model fishfinder. It has started losing signal. Everytime we initially turn it on it works fine and gathers the signal. After a while, and usually when we are at sea, it appears to get depth confusion, puts up a question mark ?, and the screen stops movement. Any signal then disappears and the screen goes to its normal background blue. The sounder then is not able to recover the signal. Oddly enough whenever it has been off for any length of time, which is usually after we are home or the next day, it works fine again. We took it to a technician and he couldnt find anything wrong with it as it worked fine. Could it be a faulty transducer or it it likely to be in the in the sounder.

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Posted on Jan 02, 2017

  • 16 Answers

SOURCE: Raymarine C120

You have either the DSM250 or DSM300 digital depth sounder module installed. The C80 is not seeing it.

There is an LED status light on the DSM. For starters, it should be lit either red, yellow or green to confirm it is actually powered on. We are hoping for a green light.

Double-check the cable between DSM and C80 for tightness. Also double-check the DSM's power cable for tightness.

The DSM's are sensitive to voltage level onboard. Make sure the DSM's connections to the circuit breaker panel or battery are tight and clean. Double check with a multimeter the there is 12V DC available to the DSM.

Let me know what you find.

Posted on Dec 28, 2007

  • 1 Answer

SOURCE: Raymarine L365 Fishfinder not registering data, it just flashes

Got a brand new one in box - let me know if interested..

Posted on May 28, 2010

  • 3 Answers


Likely your DSM25 (that little box that connects the transducer to the display) will need to be rebuilt. The red LED is saying that there is an internal fault with the unit. You would need to send the unit in for repair through Raymarine (as there really is not anyone else who can do it), and they would have to replace the main circuit card in the box. I believe that they are charging either $150 or $175 to repair those now... but likely the only way you will get that one to work again.

Posted on Jan 25, 2011

  • 784 Answers

SOURCE: Hello, our Raymarine ST40 depth sounder on our

now there is a chance that the transducer is bad ,, but I would check the battery voltage and make sure you have a soild 12 volts to the unit. also in my many years of working with and installing these units on boats I have see the needle pins ( where the plug inserts in the back of the display unit ) bend and/or break off completely. look in the plug area of the display unit and make sure all pins are intact. one more place to look for the problem is in the plug itself, take the plug apart and inspect the wire connection and make sure they are all good. if after all the above has been checked then I would assume that it is the transducer itself.
if you have anymore questions with this problem, please feel free to write back and ask,


Posted on Jan 30, 2011

SOURCE: manuel for koden cvs-801

Contact the manufacturer and order the manual.

Posted on Apr 24, 2012

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