https://community.usa.canon.com/t5/Production-Printing/Cannon-Pro-4000-One-color-on-printhead-keeps-clogging/m-p/367183#M80 <P>I have a Cannon Pro 4000 that the cyan on the nozzle checks continues to have missing sections, the grey occasionally has spots missing but comes back after a cleaning. The cyan will look good after a cleaning but when I print there is banding and the color is not correct. If I do another nozzle check it shows missing sections in the cyan. I have gone into the service mode and printed nozzle checks also. I have done all three cleaning modes also.</P> Wed, 30 Mar 2022 17:11:51 GMT JWatLCSC 2022-03-30T17:11:51Z https://community.usa.canon.com/t5/Production-Printing/Cannon-Pro-4000-One-color-on-printhead-keeps-clogging/m-p/367183#M80 <P>I have a Cannon Pro 4000 that the cyan on the nozzle checks continues to have missing sections, the grey occasionally has spots missing but comes back after a cleaning. The cyan will look good after a cleaning but when I print there is banding and the color is not correct. If I do another nozzle check it shows missing sections in the cyan. I have gone into the service mode and printed nozzle checks also. I have done all three cleaning modes also.</P> Wed, 30 Mar 2022 17:11:51 GMT https://community.usa.canon.com/t5/Production-Printing/Cannon-Pro-4000-One-color-on-printhead-keeps-clogging/m-p/367183#M80 JWatLCSC 2022-03-30T17:11:51Z https://community.usa.canon.com/t5/Production-Printing/Cannon-Pro-4000-One-color-on-printhead-keeps-clogging/m-p/367864#M90 <P>Hello.&nbsp;</P><P>If there is no improvement to the gray after multiple cleanings have been performed, service may be required.&nbsp; Please contact our phone support group at&nbsp;1-800-423-2366 for additional assistance with this matter.</P> Wed, 06 Apr 2022 00:15:18 GMT https://community.usa.canon.com/t5/Production-Printing/Cannon-Pro-4000-One-color-on-printhead-keeps-clogging/m-p/367864#M90 Michael 2022-04-06T00:15:18Z