Y stepper not working, but command tries to move x stepper

Hello all

I can control the x and z steppers but not the Y. When executing a Y command I can feel and hear a humming from the X stepper as if its trying to move, and I have only 'rarely 'gotten a humming sound from the Y stepper, but no movement, and typically I dont get any response from it.


I've got a reprap huxley with a Sanguinololu board. Everything's connected up and it kinda talks to the computer. I use pronterface.py to control the unit, and have managed to get the 'GET POS, ECHO etc buttons' on the software.

I've swapped the X and Y wires around and can move the Y stepper with the x commands, but then the X stepper doesn't respond, and I get a humming noise (no movement) from the Y stepper. So the motors work fine

I adjusted the potentiometer for the Y stepper when it was connected to the Y Pololu stepper drivers and tried movement with no results. And also when connecting it to the X stepper drivers (so I could control the Y stepper with the X commands) and adjusted the current to the Y stepper to create a nice movement. But this had no effect when reconnecting the wires to the Y driver. And the endstops all work, Ive tested them all by pressing them mid movement causing the stepper to stop.

I'm guessing it's either the software not working properly with the Y commands or the stepper driver is buggered.

I measured the current exiting the pins towards the X and Y stepper with a multimeter when executing movement commands to compare the differences. They seem to be in reverse of each other, and would send signals for the x fine, then suddenly stop sending and I would have to reset or turn the motors off to get it to start sending the commands again :s randomly without executing commands the x would have a reading of 43 (I think 43V, it was on 43 under AC V setting on the 50 position)

OK so overall the Y stepper isnt working, and I'm stumped big time. Do you think its the software messing up the Y commands, I'm not sure how to alter the Y command signal other than the potentiometer?

I'm no expert, but am willing to put in the time

(Since this is a Sanguinololu not a RAMPS, can someone move it to the Sanguino forum?)

If you installed the firmware yourself, check that its Y pin settings (probably in pins.h, configuration.h or similar) match your hardware.

Check for short/open circuits between the processor and Y driver.

The control signals are 0-5V, but the step signals are pulses not sine waves, so your meter's AC range may not be able to measure them properly.

My bad

I've copied the post to the Sanguino forum.
I can't see any cross connections on the board, and am looking into the software aspect.

Thanks