Check homing switch wiring
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Ensure correct polarity and switch if needed.
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Ensure connections are tight and solder points are solid.
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Switch the wiring for shielded cable, as the spindle can sometimes cause EMI that interferes with the homing switches
Check PWM connections (if using PWM)
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Ensure correct polarity and switch if needed.
Check spindle power connections
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Make sure the power connections are hooked up to the correct polarity (positive to positive and negative to negative)