https://community.usa.canon.com/t5/Desktop-Inkjet-Printers/Black-marks/m-p/102074#M31741 <P>Hi, our MF8550c keeps putting black marks all over our documents. I think there is black toner inside the printer from a leaky toner cartridge, however I can't any manuals to see how to clean the printer out?</P><P>&nbsp;</P><P>I've tried cleaning the fixing unit and the ITB from the printer's menu (the document feeder cleaning option isn't working) but the marks are still there.</P><P>&nbsp;</P><P>Help!</P><P>&nbsp;</P><P>Thank you,</P><P>&nbsp;</P><P>Lucy</P><P>&nbsp;</P><P>&nbsp;</P> Tue, 01 Jul 2014 14:18:09 GMT lucysearle 2014-07-01T14:18:09Z https://community.usa.canon.com/t5/Desktop-Inkjet-Printers/Black-marks/m-p/102074#M31741 <P>Hi, our MF8550c keeps putting black marks all over our documents. I think there is black toner inside the printer from a leaky toner cartridge, however I can't any manuals to see how to clean the printer out?</P><P>&nbsp;</P><P>I've tried cleaning the fixing unit and the ITB from the printer's menu (the document feeder cleaning option isn't working) but the marks are still there.</P><P>&nbsp;</P><P>Help!</P><P>&nbsp;</P><P>Thank you,</P><P>&nbsp;</P><P>Lucy</P><P>&nbsp;</P><P>&nbsp;</P> Tue, 01 Jul 2014 14:18:09 GMT https://community.usa.canon.com/t5/Desktop-Inkjet-Printers/Black-marks/m-p/102074#M31741 lucysearle 2014-07-01T14:18:09Z