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HP Officejet Pro K8600 and K8600dn Color Printers - Cleaning Printheads
If printed characters are incomplete, or dots or lines are missing from printouts, the ink nozzles might be clogged or you might need to clean the printheads.
NOTE: Cleaning the printheads uses ink, so clean the printheads only when necessary. The cleaning process takes up to 3.5 minutes. The cleaning process might generate some noise.
Cleaning printheads using the printer control panel
Cleaning printheads using the computer