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As before repare the A4988 Stepper Driver by sticking the heatsink to the black chip on the driver.

Make sure that the heatsink is not touching any of the pins. Orient the fins of the heatsink as shown.

Adjust the trimpot so that the flat side is facing left, like shown in the second image.

Check that you have 3 jumpers installed like shown in the second image.

Fix the stepper driver onto the electronics board, matching the orientation shown in the third image.

Installing a stepper driver the wrong way round will destroy it.

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