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Old 21 July 2011, 05:40   #1
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transducer failing?

while out last week my depth alarm kept going off in middle of channel saying under 1m of water. i kept resetting it and would go back to normal depths but it always came back with under 1m of water with no real pattern.

question is any ideas how i can prove the transducer is the fault and not my new GPS unit?

fwiw the speed is always bang on so the unit is seeing the GPS ok via the same large plug so i'm guessing i need to look at the transducer but not sure if i can open them up or time to stump up and gamble it is knackered?

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Old 21 July 2011, 05:52   #2
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Without knowing what kit you have it's hard to give much advice. It could be lots of things, unit software might need updating, weed, fish under the boat, mud, temp inversion. Halocline, thermocline, transducer kicked up, poor water flow over the tx face,Etc etc. I'd rule that lot out before I started taking things apart

ee lad, tha can't educate pork
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Old 21 July 2011, 06:09   #3
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Putting 2+2 together you have recently fitted a new GPS but using an old transducer? - if this is the case are you sure they are compatible? I don't have any idea what differences are and what works with what (or not) but maybe a possibility?
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Old 21 July 2011, 06:11   #4
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yeah, you're gonna have to tell us what kit you have - is it a chartplotter or fishfinder, for example?

A simple test would be to first disconnect the transducer from the network (is it networked?) and see is the result the same as the original fault. That would suggest a comms issue.

I had a transducer and fishfinder pair that failed over a couple of months and it was a little like you describe - an intermittent fault that was generally resolved by restarting the unit. The first bit to fail was the fishfinder (replaced with a potter), the original transducer failed next, that simply stopped working, eg: no readings on the plotter.

If you can borrow a compatible transducer, connect it and hang it over the side to see if the problem is resolved - it saves a lot of cable pulling!
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Old 21 July 2011, 09:12   #5
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sorry for lack of info guys. btw i should add it has been ok for maybe 20 hours use since i replaced the GPS.

my kit is this-

788ci HD Combo : : Humminbird :: Marine Fishfinder

and

XNT 9 20 :: Humminbird

boat is out the water now and i looked quickly at the transducer and i can't see anything obviously wrong. problem is in maybe 1-2 hours boating i may only see this for 5 mins so gonna be a bugger to nail down.

everything seems to work properly except the depth lately.

FYI rebooting will not cure it-it will eventually sort itself out after a few mins normally.

cheers
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Old 21 July 2011, 11:32   #6
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Does it happen randomly in any body of water i.e. deep, shallow, somewhere inbetween. Or is it usually in the same area? What happens if you reduce the gain/sensitivity, does the problem go away?
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Old 21 July 2011, 11:41   #7
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it first started happening when i got some air as it were :-)

i have not played with the gain settings yet as i've only just got round to remembering it happened!

depth of water seems to make no difference and area makes no difference if that helps.

as i said it has been fine for about 20 hours or so on this new unit so if i had to bet i'd think the transducer is going but lot of work to replace it digging cables out :-(

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Old 21 July 2011, 11:54   #8
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Is the plastic bracket intact or is it cracked and allowing the transducer to rotate up and point partially backwards underway?
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Old 21 July 2011, 15:04   #9
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Quote:
it first started happening when i got some air as it were
therin lies the problem one would think esp if as you say it sorts itself out afterwards. Humminbirds I have had never coped with speed and once they lost the plot as it were it took them a while to get their acts together again. Any air passing under the hull in disturbed water will destroy readings. Whereabouts exactly is the transducer?
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Old 21 July 2011, 16:43   #10
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Quote:
Originally Posted by wavelength View Post
therin lies the problem one would think esp if as you say it sorts itself out afterwards. Humminbirds I have had never coped with speed and once they lost the plot as it were it took them a while to get their acts together again. Any air passing under the hull in disturbed water will destroy readings. Whereabouts exactly is the transducer?
to clarify-it is happening since that-coincidence perhaps but it can happen at just about any speed now.

sorry for poor piccy but all i have of the back out the water the day i bought the boat. you can just see it under the outboard bracket. the bottom of it level with the bottom of the transom.

i will check the plastic etc to make sure it is not cracked or can move when underway.

cheers
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