Canon PIXMA iP90 Quick Start Manual page 50

Printing Maintenance
2
When cleaning is necessary, click the Cleaning button on the Pattern Check
dialog.
*Click the Cleaning button on the Pattern Check screen to proceed to Print Head
cleaning.
See "Print Head Cleaning"
If there are neither missing lines nor white stripes in the nozzle check pattern, click Exit
(Windows) or Quit (Macintosh) to finish the nozzle check.
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on page 47.
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