How do I clean the print head on a Canon IP2770 when 'An error has occurred' might be caused by a clogged print head?

Access the printer driver settings on your computer. Navigate to the 'Maintenance' tab and select 'Cleaning' or 'Deep Cleaning'. Follow the on-screen instructions. After the cleaning process, print a nozzle check pattern to see if the print head is clear. If the pattern is still incomplete, try deep cleaning again, but avoid excessive cleanings as this can waste ink.