Transformer repairs

After working on a SMPSU (or any power supply for that matter, but especially a switcher), I usually power it up to test throught a light-bulb. At first with no load and a low wattage bulb (40w) - Most switchers won't run with no load, but you will see the bulb pulse is it kicks - Brightly and solidly lit = investigate further. If it passes that test, move up to a 100w bulb and just enough load to get it to regulate. This is assuming a small (50-100w supply) - if it's a big monster adjust your "current limit" accordingly. Has saved me from "secondary catastrophic failures" on more than one occation. Dave -- dave06a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Collector of vintage computing equipment: http://www.classiccmp.org/dunfield/index.html