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Canon Laser Class 720i

Has always filthy print out even if with a new cartridge/toner. What could be the possible problem?

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First I would determine if it is the fax or printer that is causing the dirty prints.
First, print a report, any report, and see if it has dirty prints. If so it is the printer that is bad. If not, try making a copy. If you get a dirty print then, your scanner is dirty or bad. If the copy is good, have someone fax to you. If that is bad, then your phone line, their fax or the unit's modem is bad.
If the printer shows bad, do an interrupted print. Put a page in the front tray and do a report print. As the page just disappears into the machine pop open the cartridge lid and take out the cartridge. If the page is dirty at this point then the cartridge is bad or you have a serious problem with the electronics. (Remember, the toner is not fused on the paper when you stop it at this point.)

Posted on Mar 22, 2008

  • Oh, I forgot to tell you that if the page is printed good when you interrupt it while under the toner cartridge but is bad after that then your fuser is bad. The fuser can develop a torn fuser film and cause poor prints.

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The drum is n/g or the optics are dirty. possible print roller.

Posted on Mar 22, 2008

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