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Re: sounder not working
Interference like that is usually caused by electrical noise. Does it happen when everything else on the boat is turned off? If the answer is no, then you can isolate the source of the interference by turning things on one at time. Follow your transducer cable and make sure it has not been damaged or altered in any way.
Also make sure that your gain is set to auto
The GSD 21 has an LED indicator light on it. If it detects a malfunction the LED will flash in distinct colors or patterns. In the troubleshooting section of the owners manual there is a list that explains what each flash pattern means.
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If you want to use two head units off of 1 transducer the answer is yes. You will require a transducer switch that allows you to select which head unit receives the sonar signal. If you want to swap head units utilizing the same transducer the answer is also yes you can do that.
If the transducer is out of the water, you will not get a reading and see the flashing depth. You should hear and feel the clicking in the transducer when out of the water and working properly. Are you getting a temp reading when out of the water?
Your in hull ducer is getting turbulence. (in hull or not) A transducer will stop working is the tiniest cabitation or air bubble interferes. If possible, relocate the ducer. If you have a transom mounted ducer, try angling the leading edge up. This is a 90 % chance caused by turbulence on ducer. The other possibility, al;though remote is that you alternator or ignition system is interfering after a certain RPM on the motor.
Try first to manually gain the FCV620. You will always need to manual gain set the unit if you have an in hull ducer.
your feeling is correct on this
it is still probably software!
but also be aware that the power in connections are very susceptible to vibration and strains and once cracked inside they get a mind of their own. If this is a come and go problem that won't resolve, reflow the solder joints inside the DSM.