Canon Pixma MP520 series Quick Start Manual page 57

2
The confirmation screens for white streaks and missing lines are displayed
alternately. Select the pattern that is closer to the nozzle check pattern that you
printed.
If There Are No Missing Lines and No White Streaks
(1) Select All A and press the OK button.
The LCD returns to the Maintenance screen.
If Lines Are Missing or White Streaks Are Present
(1) Select Also B and press the OK button.
The cleaning confirmation screen is displayed.
(2) Select Yes and press the OK button to start Print Head Cleaning.
See "Print Head Cleaning" on page 54.
Routine Maintenance 53