Quote:
Originally Posted by The_bluester
Are they using solder to increase the current capacity of the tracks?
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Yes... not very good idea, but it works.
Also, there is no proper ground for the rest of electronics, because they used Graetz rectifier directly on mains.. so the "GND" is actually live every 10ms.
Very unsafe practice, actually it is illegal (in Europe definitely, here in Oz most likely).
That also means it is very tricky to debug this circuit as is, to do that isolation transformer is needed (or test gear should float... ).
Or, separate external supply voltages for motor and for driver electronics must be applied.