Canon pro-10s series Online Manual page 148

If there are horizontal streaks in both the pattern A and pattern B:
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.
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