I found that my printer stopped since a paper jam occurred. Well, I opened the door, removed the cartridge and found an A4 paper stuck. I gently pulled it and the paper was out.
But still printer won't start saying that a paper was stuck inside it. I tried every mean to find (in back outside door, inside, outside). Searched internet, shook the printer sideways, upside down, but nothing.
But lo, behold, in the top outside bin (where paper just comes out), I pulled the rollers (they don't fully come out, but just drop a bit), and found ANOTHER a4 paper (i.e. two papers had been jammed inside and I pulled out just one).
Also, I'd like to add, at another time, I fed a small a paper (about 3 by 5 inches) which was just lost inside printer, and showed a jam, that paper too had been stuck here only, in the path just before where the paper comes out of small rolllers.
So, that's it my friends, hope it helps.