We do have the internal board. I see two ULN2003s near the right edge of the board. Are there any checks we can make on themin the circuit?

Thanks much for the informative reply.

Ed

Microrouter V4 NS VRMilling 2.31 We started out asking about the regular homing problem. All switches were completely clean and functional (checked with meter). A second symton the we didn't mention was that it would home and then drill down at full speed on z axis or suddenly stopped while running ...