I have an Interact I MKII with the Heidenhain 2500 control. I get a spindle drive fault. It seems to repair itself most times by shutting it down and coming back later. How do you tell if it is the MT1 board or the KTK spindle drive? I have read that these can be repaired or upgraded. How big a job is that? This machine is excellent iron and I am willing to make some investment in it.
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