Often means something is blocking the printhead from traveling all the way left & right. Look carefully in there, especially under the ends, for a scrap. It may be black with ink and hard to spot, but if you see it, a minute with some tweezers may fix everything.
Sometimes the timing strip gets knocked out of its sensor, so the machine can't detect whether it's moving when it turns on the motors, so it locks up with that error. Getting to that is a bit trickier. Open the top and pry out a couple of skinny plastic covers that hide cables. One of those covers acts to lock in the lever that holds the top section up; once you've removed the cover, you can unsnap the lever from the bottom end, allowing you to stand the top (scanner) section straight up. Take a good look at the cables & how they're laid. The flat white one is especially delicate, and must not be reinserted crooked. Unplug those cables and pull them out of the way so you can remove the top cover they're laid in. There's also a ground wire to unscrew.
The top is held on with what - six or seven screws? Keep track of which goes where. I think the front edge is caught by a plastic hook, also. Free it by prying with a small screwdriver, and lift off the top cover.
The whole printer mechanism is now exposed. You can see the 1/4-inch (6mm) wide strip of film that's stretched tight across the entire width of the printer area. The gray in that strip is hundreds of fine vertical lines. A sensor in the printer head carrier shines through those lines and counts them to keep track of where it is at all times. If you find the film strip laying flat across the top of the printhead, just lift it carefully and lower it into its slot in the sensor. It should be vertical and straight. Don't get ink or fingerprints on that strip; it can be cleaned - very gently - with a damp cloth.
Put the cover back on, install those cables, the lever that holds the scanner up, and the little covers, and try it out.
If it's not a paper scrap or that timing strip, it's probably too expensive to mess with, but check with the closest service center listed on Brother's website. If none appear to be close enough, don't be shy about calling one of the closest ones and asking if they have another branch that's not listed on Brother.
on Jun 30, 2014