Canon PIXMA TR8520 TR8500 series User Manual - Page 111

For A (no missing lines or no horizontal white streaks) in both the pattern C and pattern D: The cleaning is not required. Select All A, confirm the message, then select OK. The screen will return to the Maintenance screen. For B (lines are missing or horizontal white streaks are present) in the pattern C or pattern D, or in both patterns: The cleaning is required. Select Also B, then select Yes on the cleaning confirmation screen. The printer starts cleaning the print head. Cleaning the Print Head If the pattern D or any color in the pattern C is not printed: (Example: Magenta pattern is not printed) The cleaning is required. Select Also B, then select Yes on the cleaning confirmation screen. The printer starts cleaning the print head. Cleaning the Print Head 111