Re: compact 5: advance motor "humming"

cncwannabe
 

Never mind my previous post.  Looking back I you have already answered the question.

Replacing all the transistors seems a bit extreme.  You could start by using a DMM in diode check mode and compare the readings between similar transistors.  A failed transistor should stand out.  

Perhaps Henk will elaborate on the implications of your measurements.  

Walt

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