Electronics > Beginners
Mastech HY3003D-2 can switch to 110 from 220?
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Jwillis:
Looks like an identical switch board.I can't see all J1.its possible theirs a  jumper on the 2 center pins( pin2 and pin3) .Might be as easy as pulling that jumper and replacing with 2 jumpers that connect the green and the orange wires in parallel.If I'm correct jump pin 1 to pin 3 and pin 2 to pin 4 .That's really all the mains select does.I would have to see the under side of his switch board.
I have other toriods and non of the primaries have miss matched colored wires .

But this has got me thinking if I could "up grade" mine for more current.Any one have photos of a HY3010 or HY3020 ? Sorry the schematic is a HY3005 not a HY3020
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