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Fisher PI shock problem

A

Anonymous

Guest
I recently sold a Fisher Impulse PI detector which I had never used in water. It was sold to someone who tried it in salt water and in the process he found out he gets a shock when he touches the volume control when he is in the water with it. It otherwise works normally. Any idea what the problem could be? thanks, John
 
said it would be a mininum of $75 just to look at detector + parts. Was just wondering if it seems like a loose ground wire or something easy. Thanks, john
 
It might be wise to send it in as apposed to trying to do a repair as if you don't get the seals right the unit will leak. It then becomes a very expensive paperweight.
 
I can't think of any mechanism that would cause a shock. The battery is only 12V and it is unlikely that this potential could appear on the outside of the unit. The maximum coil voltage is 5V peak to peak with no large voltage spikes like a standard PI has. Static is unlikely to be the cause as both detector and user are in conductive salt water. So, it's a bit of a mystery.
Eric.
 
I sent him some money for the repair and he sent it back to Fisher. They probably won`t say what the problem was but it sure was wierd. Seems so little voltage and so little amperage. I wonder what the shock felt like. He is in the Florida Keys and it will be used under water primarily so it has to be waterproof and retested by Fisher. Thanks for replys. John
 
and they said it would be a minunmum time of 1.5 hours because of it being a water detector. Plus parts will be extra. They didn`t say if there would be any warranty on the work, but I would assume they may send something back on it. Good huntin, John
 
The Fisher underwater housing is very well engineered from most standpoints. However, taking it apart and putting it back together is a tedious process, and reassembly has to be done exactly right by people who are skilled in doing it.
I believe that every unit repaired is put through the pressure tank to verify that it doesn't leak, before shipping. Since it takes time to build up the pressure, and time to measure the pressure drop caused by a leak, pressure testing is time and labor intensive, which also drives up cost.
The upside of all of this is that in the field, for a Fisher unit to leak is almost unheard of.
--Dave J.
 
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