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RAMPS 1.4 test code not working for Z-axis

Posted by patxystage1 
RAMPS 1.4 test code not working for Z-axis
May 08, 2017 12:47PM
Hello,

My Z-axis motor is not moving when I run the RAMPS 1.4 test code. I have verified that the motor drivers are not the cause. I have also used a multimeter to check the voltages coming out of the DIR, STEP and VMOT pins. When comparing the voltages from these pins on the Z and X axes (which works), they are identical. Any suggestions would be much appreciated.
Re: RAMPS 1.4 test code not working for Z-axis
May 29, 2017 01:16PM
Update:
The Z-Enable pin is outputting 2.75V, even though in the test code it is set as "LOW", which should make it 0V. When I changed it to "HIGH", the voltage outputted was 5V, as expected. Following this, I removed the RAMPS board and checked the arduino pin which connects to the Z-Enable pin (A8). This pin outputted 0V when set to "LOW" and 5V when set to "HIGH", as expected, so I'm not sure where this discrepancy is coming from. I have a spare RAMPS board which I tested and had the same issue with, which leads me to believe that something may be wrong with the arduino...
Re: RAMPS 1.4 test code not working for Z-axis
May 31, 2017 12:16AM
Sometimes the connectors between Ramps and Mega board aren't providing best contact. Maybe contact spray will help? But look for cold solder joints first.
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