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Old 21-01-2014, 16:24   #1
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Join Date: Feb 2013
Posts: 13
autohelm st4000 phantom dodge

my st 4000 will occasionally veer to port about 20 degrees and then correct back to it's heading. a friend gave me another unit that had been replaced because it would turn 360 on its own. what is going on? its not anything being moved near the flux compass.
hornby sailor is offline   Reply With Quote
Old 21-01-2014, 17:32   #2
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Join Date: Aug 2003
Boat: Dragonfly 1000 trimaran
Posts: 6,879
Re: autohelm st4000 phantom dodge

Mine was caused by 8 or 9 bad solder connections to the four 3 Mosfet transistors in the head unit.
Easy solder fix.
senormechanico is offline   Reply With Quote
Old 21-01-2014, 17:52   #3
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Location: Sydney, Australia.
Posts: 170
Re: autohelm st4000 phantom dodge

Maybe try re calibrate your flux-gate compass.

Requires some button pressing and a 360 degree circle... see your manual.
giant is offline   Reply With Quote
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