I have bought other replacement toner cartridges for my Canon MF726CDW and each time I got an error message about the cartridges, mainly because they were not Canon cartridges. I thought I would get the same with these. Boy was I wrong. Canon is very picky about cartridges, but they are perfect. No error message at all, it's nice to know that even though they're not Canon cartridges, they work perfectly. I did "Full Gradation Adjustment" with no "Error" message. Just to make sure I typed the letter and it was perfect. I will definitely buy them again when I'm ready to replace cartridges.
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