I was getting paper jams on my 962 (I assume we aren't talking about the ADF but the bottom blank paper tray?). Anyway it turns out my paper size guide had been pushed in from A4 which was the correct setting to the next lower paper size (printer is on lower shelf under my desk and must have knocked it with my leg), meaning that my paper stack was compressed up against the roller/paper grabber. First realised there was a problem when the first prints of a run were coming out skewed, then printer started to jam. Problem was resolved when I noticed the paper guide was at the wrong setting and moved it back to A4.