Canon BJC-250 User Manual page 53

Nozzle Test
Use this test print to check that each print head nozzle is operating properly.
When the BC-05 Color BJ cartridge is installed, the pattern includes the three colors: yellow, magenta,
and cyan. In the color pattern, you'll notice that lines are missing between the colors. This is normal.
The following sample shows the nozzle test when the optional BC-02 Black BJ cartridge is installed.