Canon MB2100 Series Online Manual page 206

The Maintenance screen is now displayed again.
In the case of B (some missing lines or horizontal white streaks) in either pattern (C or D) or both
patterns:
Cleaning is required. Select Also B, and then press the OK button.
A cleaning confirmation screen is displayed.
Select Yes, and then press the OK button.
The machine now starts cleaning the print head.
Cleaning the Print Head
Note
• On the nozzle check printout, the record of total pages printed is indicated in increments of 50 pages.
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