- Jan 1, 1970
Eeyore said:I suggest you remove the 5V voltage regulator.. That'll remove the connection
from the power supply to the digital section and NOW check for a short across
the 5V and ground.
The regulator chip may have an internal short you see and it is at least easy to
remove from the pcb.
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
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
that will be next Graham.