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Portable drill operates opposite of direction switch


videobruce

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Long story short; The chuck is turning the opposite direction of the intended direction. Forward is reverse and vice a versa.  And yes, I did try swapping the motor leads which is where it got even worse.


 

Doing so solved the problem, but only for a day. The very next day, the direction is opposite again. IOW's, it reverted back to opposite if the intended direction.


 

There are two transistors mounted on a heat sink in the base of the tool. There is also a large rectangular component with two leads, I can only assume it a capacitor, thou it's a very odd shape.
 

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I have another identical older model and that is ok. This is less than a year old, but was refurbished, so the warranty is expired.

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This whole thing started when the battery pack was discharged (apparently) enough, the motor did not turn, but the LED work light did light which I took as a problem with the tool. Past practice, the motor will turn, barely if the charge was low, but any other drill I have used (NiCad or NiMh) it would at least make a noise. Assuming, due to this newer lithium ion battery pack tech, things changed and these motors now have a 'cliff effect'. It's either runs or it does not.

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Ok, any electronic experts out there can explain this one? (I have not found any gremlins yet. ???  )

 

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