Hi Rekrespite,
When the print output is not as expected, first please follow all of the steps provided on this page from the manual:
TS6400 series > Maintenance > If Printing Is Faint or Uneven > Maintenance Procedure
Please note, Canon USA does not recommend the use of inks manufactured by third parties in Canon printers.
Canon genuine inks are formulated specifically for use in our ultra-precise print head. Our print head and inks work together as a precisely engineered system to support optimum image quality, print speed and reliability in higher resolution text and color printing applications.
Canon supplies and accessories can be purchased online at http://shop.usa.canon.com/, or by calling 1-800-385-2155 to speak to a Canon Direct Representative.
Should you decide to use inks manufactured by third parties in your Canon printer, and such inks cause damage to your product, this damage will not be covered under the product's limited warranty. Any repairs required as a result of such damage must be made at your expense.
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