Per Canon's website, and this just worked for my mp620:
Turn the printer on.
Open the cover.
Remove the ink cartridges.
Remove the printhead.
Re-install the above (this resets the printhead).
Close the cover.
Printer should initialize and go to home menu screen.
There's a defect in the printer. See
Canon USA Inc Consumer Class Action and
http://www.federmanlaw.com/Websites/federmanlaw/images/QUESTIONNAIRE.pdf
"...at least 16 different Canon printer models have been identified that display an error message of "U052: Wrong Printhead Error," after limited use. This error indicates that the printer does not recognize the printhead, or that the printhead itself is faulty, but disables all functions of the printer, including scanning and facsimile capabilities, rendering the printer unsuitable for its intended purpose and use."
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