I spent 4 hours with this FS-533 today and took it to down the frames. Everything turns freely. There was none of the heavy tar-like black grease that the Toshiba internal finishers have. About the only thing I could identify was the timing was off on the upper exit roller lift. Naturally there is no explanation of the timing marks on the gears. But in the Theory Of Operation FS-533 section there are some good illustrations, and if you blow them up to 400% you can see the marks.
Once reassembled I ran 750 pages through the finisher on our in-shop 284e, so I had that really good feeling. When I took it out to the customers location it jammed on the very first page. If you duplex, the first side passes, then jams the duplexed image in the stapling tray every time. Still J72-17.
As plans go, I could take the other internal finisher out to the customers location to see if it jams too. Or I could order an MFPB.
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