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I would guess that your paddlewheel transducer is an ST850 and manufactured by Airmar. Check the link below, the top two on the page are ducers for temperature and speed. (First one is a plastic housing, second one is brass) Any chandler should easily be able to help you out.
Here are some things to check:
1. There are belts inside the unit that drive the wheels. These belts often fail (shred) and must be replaced.
2. There is a paddlewheel that drives the turbine that turns the wheels. If the jet that drives the turbine is clogged, then the paddlewheel will not move and the wheels will not turn.
3. There is a water management system inside the bottom of the unit. It looks like a bunch of little hoses. If one of these hoses comes loose, then the water pressure will escape inside the unit and will not be sufficient to drive the wheels.
Hope this helps
I installed my Navman 4150 depth finder along with the Navman GPS unit when I purchased my Bayliner Trophy 20Ft. Offshore model. Everything was ok for one year and it has been downhill since then. Losing signal, unbelievable high depth ranges, blank periods, etc.. I now can't even get a reading tieded up at the dock. I am now giving up and shoping for a quality unit.. Cape Disappointment.........
It is unlikely the problem is in the A65 screen.....most likely it is an issue with the paddlewheel itself, its circuit in the depth/speed transducer, or least likely, in the DSM25 sounder module.
Both the log and the trip functiions are read from the paddle-wheel sensor of the connected DSM25 sounder module and transducer.
1. Make sure you have a DSM25 sounder module and transducer with a paddle wheel (the A65 is available without the DSM25 option.)
Double check the connections between the DSM25 and the A65, as well as the transducer connection to the A65. There is an indicator light on the DSM25 to confirm it is on.
2. Make sure the paddle wheel turns freely. They tend to get fouled easily with debris and growth.
3. Make sure the A65 is giving to a reading for SPEED when underway or when having a buddy spin the paddlewheel by hand. Do not confuse SPEED with SOG. SPEED is from the paddlewheel.....SOG (Speed over ground) comes from your GPS sensor and is not used by A65 for log or trip purposes.
If you get npo speed reading at all the paddle wheel may be defective or the depth/speed transducer may be defective. See your dealer about a replacement.
Depth: Could be for a number of reasons, too deep for the sounder - check the manual for it's max depth. Dirty water, sounder unable to penetrate through to the bottom. Weed or other debris covering the transducer. Transducer on a swing mount & being pushed out of alignment then dropping back in once stopped.
Speed: Is the speed readout controlled by a GPS or paddlewheel? If it's GPS, check the power connection of the sounder, may be loose which would also cause the depth to 'drop out'. If it's paddlewheel, you're down to bad connections or faulty unit.