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  1. #11
    3D Printer Noob
    Join Date
    Oct 2015
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    It is looking that the problem is the board is not self powered standalone.
    According to me the logic side either requires USB or the standard 2.1mm round coaxial power jack 5V.
    There are 2 through holes on the board labeled ground and 5V. That pair is directly in parallel with the round 5V logic input.
    Pretty sure they used the standard USB power switch setup to prevent backfeeding up USB.
    Last edited by UriValle; 10-26-2015 at 05:09 PM.



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