Canon HC-4200 User Manual page 48

Use this test print to check that each print head nozzle is operating properly.
When the BC-21 Color BJ Cartridge is installed, the pattern includes all four colors:
yellow, magenta, cyan, and black. 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 optional BC-20 Black BJ