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UMO+ burning stepper motors and brownish board

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Hi everyone!

Since I got my UMO+ the stepper motors get really hot when they're working (I can't touch them for more than a second without burning). Two weeks ago my heated bed sensor died, and when I disassembled the board cover I saw that the the board is brownish (burnt) around the X,Y,Z and E1. On the picture you may not appreciate them very well, I just didn't want to photoshop the picture to give a wrong impression.

Is this normal or is there any risk something fails? I checked everything, but as it's the same board as the UM2, the power sent to the stepper motors can't be easily changed.  



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