Canon PIXMA MG5721 User Manual - Page 194

7. Select Yes, then press the OK button. The machine starts cleaning the print head deeply. Do not perform any other operations until the machine completes the deep cleaning of the print head. This takes about 1 to 2 minutes. The pattern print confirmation screen will appear. 8. Select Yes, then press the OK button. The nozzle check pattern will be printed. 9. When the completion message appears, press the OK button. 10. Examine the nozzle check pattern. If a particular color is not printed properly, replace the ink tank of that color. If the problem is not resolved, turn off the power and clean the print head deeply again after 24 hours. If the problem is still not resolved, the print head may be damaged. Contact the service center. 194