Canon Pixma iP4300 Series Quick Start Manual page 45

Note
The nozzle check pattern will not be printed correctly if there is not enough ink. Replace the ink
tank if the remaining amount of ink is insufficient.
See "Replacing an Ink Tank" on page 26.
5
Check the print head condition with the printed nozzle check pattern, and take
appropriate action.
See "Examining the Nozzle Check Pattern" on page 38.
Note
If the problem is not resolved after performing steps 4 and 5 twice, try Print Head Deep Cleaning.
See "Print Head Deep Cleaning" on page 42.
Routine Maintenance 41