RAMBo No Stepper Response
April 13, 2018 11:49AM
Hello,

I just purchased a RAMBo from Ultimachine. I downloaded a fresh copy of Marlin, and began configuring it (motherboard, enable the smart controller, etc). When I uploaded it to the board, everything responded as expected, the LCD works now. But I have no response from the steppers. I have measured the voltage across both coils, on multiple axes, and there is no voltage present. Is there something else I need to configure in Marlin? Or is there something wrong with the board.

Thanks!
Re: RAMBo No Stepper Response
April 13, 2018 09:11PM
In order...

what type of Rambo, and what did you set as the motherboard

DId you power it correctly?

have you checked your endstops? (use M119)

have you homed the axis?
Re: RAMBo No Stepper Response
April 14, 2018 12:20AM
Thanks for your reply.

As I was reading it, I realize what I have done. I was being dumb - I guess I just had to walk away from it:

I had initially only put power to the center 2 pins, to power the logic, so that I could load the firmware. I totally forgot that this board has motor power on separate pins.

I just put power to the motor pins, and everything appears to be working now.
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