If the pattern is not printed correctly, check if the ink tank for the problem color is empty.
If the ink tank is not empty, go to the next step.
If it does not improve, go to the next step.
If it does not improve, turn off the printer for more than 24 hours without disconnecting the power plug, and go to the next step.
For details on printing the nozzle check pattern, print head cleaning, and print head deep cleaning, see If Printing Is Faint or Uneven.