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I had a paper jam on my printer, which I cleared, but now it is cycling through error message "Insert xxx toner correctly" for all 4 toner cartidges.I have tried reseating the cartridges, turned the unit off and on several times, but cannot clear the...

My MF9220Cdn has started giving horizontal yellow stripes on printout, both copying and printing. I try running the fixer cleaning process and it cleans it up for a short while then the stripes re-appear. Any thoughts? Should I change the Yellow tone...