Canon PRO-10 Series Manual page 125

If there are horizontal streaks in both the pattern
Cleaning the nozzles of all ink colors is required.
From the printer
Cleaning the Print Head
From the computer
Cleaning the Print Heads from Your Computer
Note
The total number of sheets printed so far is shown in increments of 50 sheets on the printout of the
nozzle check pattern.
(1) and pattern (2):
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