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19-06-2019 #1
The ribbon cables you have connected are for the motor. The stepper shield is made for the A4988 stepper drivers, and if you want to replace those drivers with something else then you need to connect your drivers instead of the A4988, i.e. wire the driver signals STEP, DIR and EN and of course GND from the stepper shield to the new drivers.The motors must then be connected to your new drivers and not to the stepper shield. Also remember that the new drivers must be connected to the motor power supply, not the stepper shield. I made a quick picture, hope it makes it clear for you.
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