Canon MP640 - page 109

See step 1 in Examining the Nozzle Check Pattern.
If a particular color is not printed properly, replace the ink tank of that color.
See Replacing an Ink Tank.
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.
Note
Press the HOME button to exit the Settings menu and display the HOME screen.
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Page 109 of 988 pagesCleaning the Print Head Deeply