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If you are using a mobile device (iOS or Android) or a Chromebook, you can clean the paper feed roller for the PIXMA iP8720 using its Remote UI. This requires that the printer and mobile device or Chromebook be connected to the same wireless network. Follow the steps below to clean the paper feed roller from the Remote UI.
If you're experiencing poor print quality (banded / streaked prints, incorrect colors, or blank pages when printing), printing a nozzle check can help you determine if print head nozzles are clogged.