I have replaced all black ink and have done the maintance for "Back of Paper is Smudged.Also did the Cleaning of rolers and other maitenance. But still get a 1/4 inch very heavy black ink on the backside of my paper. If we are printing many copies, some will have the thick line and some won'tl.
Thanks for your help
Same problem appeared with mine, but one month out of warranty. Black streak of varying intensity up to 6mmm wide on reverse of sheet being printed. Repeated reuse of the "Bottom Plate Cleaning" utility (60 to 70 times) did not solve the problem. Seems the problem lies with the pipe that carries waste ink from the purging dock to the middle of the machine where there is a large ink absorbent sponge. This pipe (or tube) blocks up and excess ink then builds up, eventually ending up on the back of the paper being printed. Canon support refuses to accept that this is a design fault, and claims that it is a "mechanical fault" , not their fault as the warranty has run out. There may be an 18-month warranty in parts of the US, but for the rest of us it is 12 months. Took the machine to the local Canon-authorised repair shop who charged EUR80 to unblock the pipe. There was no breakage or other mechanical fault. It will block up again, and there is nothing you can do about it - just grin and pay the repairman. It is amazing that a defective design such as this is allowed to be offered in the shops.
4. Start bottom plate cleaning.
] or [
] to select [BOTTOM CLEANING], then press <OK>. The sheet of paper is automatically fed in and then out of the machine.
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vertical black line on back of copies. sometimes 1/4 inch across and sometimes a thin line.
I'm having the same problem as reported by two other users: about a 1/4" vertical line of black ink suddenly started appearing on back of pages. Usually gets lighter after 3 or more copies -- more like a smudge -- but still obvious. Contacted Canon's tech support and re-did the Maintenance steps in the manual for Bottom Clearining and Roller Cleaning; also cleaned the "protrusions," but to no avail. It's worked well otherwise, so 'm taking it in for service at a local Authorized Service Center; also, it's only 2 years old, been well taken care of, and I hate to trash it. Will post results of servicing when it's completed.
Black line smudge at end of printed paper
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