My workhorse printer is a Brother MFC-7820N. I’ve had it since 2007. Over the past month, I’ve had constant paper jams. I tried cleaning the pickup roller that feeds the paper from the paper tray. That didn’t do squat. I figured it was time to buy a new printer, so I researched the current Brother models. For some reason, Brother hasn’t updated their MFC line in several years. I really didn’t want to buy outdated technology, so I took to Google to see if there was a fix. Sure enough, there’s one post on the web describing my problem. I am providing the link here, to give credit where credit is due. Much thanks to Oleg Andrukh!
My jamming problem did not involve sheets that got crumpled up like an accordion. (That’s a more common jamming problem.) In my case, it seems as if two sheets of paper were fed from the tray at once. The second sheet would get jammed in the internal paper path. The root cause of the problem is that a plastic clutch was sticking against a protective foam pad. This pad isn’t supposed to be sticky. It turned sticky over the years. The solution is to put a piece of tape over the pad. Problem solved!
This repair isn’t for the faint of heart. The left panel of the printer needs to be removed, as well as a gear. Oleg doesn’t mention this, but in order to remove the gear, there is a plastic tab next to the axle that needs to be depressed with your fingernail. This YouTube video explains the procedure to remove the gear. (Watch until 3:20. No need to replace the pickup roller with this particular jamming issue.) Don’t forget to unplug the printer from the AC if you attempt this!