next
look
the connection
a short across
at least easy to
ah ha the L387, i only know this because i looked through the datasheets i downloaded for all the ICs until i crossed the L387 (5v regulator)
well that just makes too much sense ... start with 5v related ICs first, i tried to trace the transformer output but had not made it that far yet
situated next to the L298s (hmm big surprise) i guess i should have surmised this since all the power regulation for stepper motors and such is bolted to that heat sink.
i will report results when done, hopefully find some joy
thanks, robb
that will be next Graham.