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Recently I assembled my Shapeoko machine, we used Grbl shield with an Uno for the same.

For 1-2 weeks everything worked perfectly then once when I tried to work the machine, the serial communication was not working. I tried to replace the 16 MHz oscillator because I thought the problem might be with the oscillator since the LEDs were not blinking but they were lighting up.

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Maybe the 5v regulator? Hard to say without the symptoms.

  • This should be a comment rather than an answer. – CharlieHanson Aug 6 '15 at 21:09

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