Canon PIXMA Pro9000 Series Quick Start Manual page 54

Printing Maintenance
2
When cleaning is necessary, click Cleaning on the Pattern Check dialog box.
If you want to continue to clean the Print Head from here, go to (3) in step 3 of the
Windows or Macintosh Print Head Cleaning procedures as appropriate.
See "Print Head Cleaning"
If both of the group (1) and the group (2) patterns have no white stripes, click Exit or
Quit.
Nozzle Check Pattern examination finishes.
50
on page 51.