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I am sorry to say it's a problem with printhead. Printhead is the part of the printer which puts ink onto the paper.Did you try cleaning the printhead?
Would you like me to remote in and work on the issue directly?
In that case I will send you the printhead cleaning instructions.
Please click this link to access the printhead cleaning manual: https://support.usa.canon.com/kb/index?page=content&id=ART116489&actp=search&viewlocale=en_US&searchid=1454523228378
Tell me if it makes any difference to your problem.