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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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I have had the wiring to the hall sensor fail on one of these. I vaguely remember it being a broken wire (at the solder joint) under the hall sensor.
Anyway, the quick check is to see if voltage is getting to the sensor. . ..something like ~3V.
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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