Chosen Solution
I’m having trouble with my MFC Brother 9340 color printer. For the last 2 weeks, everytime I put through standard copier paper, the top left quadrant of the paper comes our “bubbled”. I’m not sure if it’s from the fuser, or if a wheel is warped, but it needs to be fixed. Can you help to diagnose this problem.
I had the same issue. Mine had odd, sharp edged bubbles/indentations that I could’’t figure out. It’s the fuser roller in the back of the machine, about $15, but a bit of a pain to replace. When I got the roller out, the coating was bumpy - the aluminum roller underneath the coating had become damaged (by the heat? oxidation?) If you are a handy person, there are directions online.
I am having a similar problem in that my brother MFCL2740DW keeps hitting something which folds the top of the paper in duplex mode. Have taken it apart at the back, cleaned everything with Iso , checked everything . I set the paper thickness to thick and it still does it. It might be the fuser roller assisted by Dan. Its an old machined I’m using the cheaper TN66 Toners. Probably not an easy answer, but a process of elimination.
