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neptuna

UM2 Mainboard Stepper Driver

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Hi everyone.

I am building my first 3D printer. I assembled everything. But when I turn the printer on, the stepper motor connected to the Y-axis is not turning, it steps forwards and backwards and makes strange movements (as if it vibrates). All other steppers turns smoothly. I replaced the steppers so the problem is not the motors. Something is wrong with the Y-axis driver on the main board. (I order the board from China since the genuine one is 3-4 times more expensive in my country.)

I am not familiar with the stepper drivers or arduino so my question is this, is there something wrong with the driver (a4988) or something wrong with the software or other electronic (resistors or something.)?

Has anyone experienced that behavior before?

Thank you in advance.

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If one of the 4 wires is broken you will get similar results so swap the Y stepper with another stepper just to make sure it's the board. If the problem is still with the board then you should just buy a whole new board. It could be many components - the driver itself or any of the capacitors or resistors nearby. Or a bad board etch (not likely).

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On a um2 board you have a extra output for a stepper. You could probably remap this extra one to be the y-axis in firmware assuming you don't need dual extrusion....

I think it has been described on this forum before but i'm to lazy too look for it now as I'm on my phone.... so see if you can google it.... otherwise ask again..

Edited by Guest

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If one of the 4 wires is broken you will get similar results so swap the Y stepper with another stepper just to make sure it's the board.  If the problem is still with the board then you should just buy a whole new board.  It could be many components - the driver itself or any of the capacitors or resistors nearby.  Or a bad board etch (not likely).

 

I try that, it is not about the motors, something is wrong with the board.

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On a um2 board you have a extra output for a stepper. You could probably remap this extra one to be the y-axis in firmware assuming you don't need dual extrusion....

I think it has been described on this forum before but i'm to lazy too look for it now as I'm on my phone.... so see if you can google it.... otherwise ask again..

 

This is exactly what I think but I can not find anything.

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