>And maybe it's just a random intermittent fault that is
>nothing to do with a particular axis - what is leading
>you to believe it's motion related - does it give a
>meaningful error code or something ?

No, it just flashes an "error" LED and goes south until power cycled. It has
no display for error codes or any such stuff.

As to why I think the fault is related to one axis, this is a one of the
"desk top flat bed" type plotters that move the pen in the X direction, and
paper in the Y direction, using separate motors with minimal mechanical
linkage. The X motor does most of the work, and seems to be the one that is
moving at the time the error occurs.

You could be correct in it being random and/or intermittent, but from a cold
turn on it will work for the longest before failing. Each attempt at working
after this seems to run for shorter lengths of time.

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