Hi HeadSmess,
I can't afford these Gecko's, hence the anxiety I mention. Well, not as a method of testing the motor anyway!
A new motor is in my posession, smaller and lighter than the original, as Rich suggested. This opens up possibilities for when there isnt' a rush on; I could swap the big one from the Z for this lighter one. There isn't much triangulation on the Z, and the weight of the motor at the top makes it pendulum a bit.
I was fooled last time when I eventually found some hidden fuses. this time I saw half a cup of grey smoke and heard two cracks. The first I didn't see, but I heard it, and, I am testing right at the motor. 8 wires 100mm long, straight in. Two phases are connected that shouldn't be. 201's
Right at the stepper Fastest1. There isn't much hope for it I'm afraid. The replacement cost less than the Gecko so...
Thanks for the replys guys. There's something heartening about communications from other members.
Jim