Help with my dead Raymarine sounder/fish finder

[jcwiza]

My sounder went dead today. It is a Raymarine C80 and DSM30 sounder with a transom mount transducer. All was working fine yesterday. Today, I get a blank screen and no signal. No temp. No depth. No image. The chartplotter and radar work fine. Just the sounder stopped working. I pulled the boat out of the water, and the trandsducer is still there, looking normal.

So, where do I begin troubleshooting? Anyone else have this problem?

[eggsuckindog]

take the head unit to a dealer and have it bench tested - its either the head or the ducer