I have a lowrance x135 mounted on the bow with a trolling motor mounted transducer. The problem is sometime it works fine then the screen shows lines up and down the depth will go from 10ft to 100+ ft in 10 foot of water. And the tempature always reads 32 no matter the water tempature. It came on the boat when I bought it. Don't know if it is a unit problem or a transducer problem (transducer for this is about $70.00 so I didn't want to buy it if the unit is bad).
Had the same issue with another brand. Turned out the transducer cable was picking up noise from other cables (power, trolling mtr. etc). Try moving the transducer cable away from any other cables. I put the cable in a 1/4 " plastic housing up to the point where it was above deck and it stopped all the strange stuff. Not sure about the temp issue??
I'd most likely just replace the entire unit with a warranty. As it surely is more than a few years old.
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The m68c transducer is 200K Hz. The m68c power out is 800 W
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how to make it work when you turn it on
how to make it work when turned on
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