There is no consistency when manufacturers label the A and B stepper winding connections.
Glad it worked. If you want, you can send me the faulty DM542. I can do a tear down and analysis of the drive. Compare with my working DM542.
Of course not 
Might as well, I’ve got no use for them. All I ask is details on what you find 
I’m really curious.
PM me an address and I’ll send it out.
I strongly support sending Jim things to tear apart, ahem, test. Jim got the first C3D LaserBoard prototype I ever made for the above reasons 
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