Canon BJC-2100 Series User Manual page 140

I Examining a Nozzle Check Pattern
The patterns show the status of the BJ cartridge.
BC-21e Color BJ Cartridge or BC-22e Photo BJ Cartridge
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Black BJ Cartridge
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If the pattern is broken or missing, or a specific color is not printed, clean the print head.
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Cleaning the Print Head
Printing a Nozzle Check Pattern
Maintaining the Printer 140