I just picked up a II+ locally that is in pretty good physical shape. It appears from the property stickers that it belonged to NC State University at some point, and the label says A2S1, despite have a IIplus case cover.
Anyway the board is a clean Rev4 with many upgrades- looks like lower case, a Videx card, Applicard, and a Saturn 64/128k RAM card.
No power, though. It did turn on *once* then died. I opened up the PSU and the fuse is blown. I know it happens for a reason, so what is the easiest way to test the bridge rectifier, and if bad, what is the replacement part?
I found another thread where someone said the DB1 is the #1 reason for blown fuse.