How to remove the printhead of a canon pixma ip7240?

SOURCE: How do you replace the printheads on a Canon ip4000?

When you open your top cover (with power on of course) your print carriage will move across to the centre of the printer. Remove your ink tanks (same way you always would) and the place where the cartridges sit is actually your printhead. To remove it you need to lift the small gray arm on the side of the carriage upward. Now the printhead itself will just slide out. Replace with new one same procedure as removal reversed.

SOURCE: How do I remove the printhead Canon Pixma MP780

OK lift the gray lever up and remove the cartridges, look just below the gray lever and you will see two rounded protrousions inside towards the rear of the black box, grasp these protrousions with your thumbs and forfingers and gently pull toward you, ther may be some resestance but pull smoothly do not ****, the print head will come out.  There are no wires to disconnect the circuits are touch circuits.

SOURCE: HOW DO I REMOVE THE PRINTHEAD FROM MY CANON PIXMA

Open the cover and there's a grey plastic lever next to the ink cartridges. flip it up and lift the entire cartridge out.

SOURCE: PIXMA MP830 All-In-One InkJet Printer: How to remove a printhead from an mp830...

-Get the m,anual from canon site, where all is explained

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You can try ebay or Canon them selves, the trouble is they cost about £50, as much a new printer.

Alternatively you could try cleaning the head, its probably only blocked with dry ink. But not using the printer software, you'll have to get hold of a printer head cleaning kit, I've seen them on ebay you'll probably also get them from ink suppliers.