This caught my eye, so I looked at the schematic. Ironically, the shorted full-wave rectifier is shown on the "power-fail" circuit drawing. But the rectifier supplies all the unregulated DC voltage. Unfortunately the fuse F1 is *after* the rectifier and not before. Thus adding a fuse before the rectifier is wise. Bypassing the now-destroyed edge-connector pins is also wise. Did you determine the normal AC current on those pins? I suspect a few amps, thus those pins are at risk anyway. Thanks for calling this repair out. It's a cautionary tale about vintage power supplies in general; look for AC-side fuses, install if not. I"m looking at an IMSAI; the prior owner bypassed the AC fuse holder! ;( Shocked, Herb -- Herbert R. Johnson, New Jersey in the USA http://www.retrotechnology.com OR .net