Apple power supply problems

one of my 3 apple //GS wouldnt power up which after subbing parts out, turned out to be a power supply issue. i took the cover off the ps to look around finding nothing obviously wrong. i looked at the fuse and wasnt sure if it had burned out or not. call me crazy or whatever, but i used a paper clip to bypass the fuse and plugged the ac in and powered on for just a sec. i got a bit of smoke so i powered off and checkes. not finding the source, i did it again while watching. this time, something really smoked! it seems to be a small transformer of some sort, about 3/4 in square and 1 inch high and it's right near where the a/c comes into the power supply. there's a larger one right int he middle of the circuit board. it's still hot several minutes later! thankfully the computer itself is ok although it did reset my main computer on the same electrical outlet. provided i didnt destroy the whole bloody thing, what could be causing the problem? david