Canon PIXMA MG7720 User Manual - Page 763

If the problem is not resolved after performing print head deep cleaning, turn off the machine and perform print head deep cleaning again 24 hours later. • If problem is not resolved after performing print head deep cleaning twice: If print head deep cleaning does not resolve the problem, the print head may be damaged. Contact your nearest Canon service center to request a repair. Check3 Perform print head alignment. Aligning the Print Head Note • If the problem is not resolved after performing the print head alignment, perform print head alignment manually. See Aligning the Print Head Manually. 763