u Can Follow this step :
http://support-sg.canon-asia.com/contents/SG/EN/8200986100.htmlif that reference can't solved, in other reference i found this statment
http://www.canon.co.uk/Support/Consumer_Products/products/Fax__Multifunctionals/InkJet/PIXMA_MP_series/MP620.aspx?faqtcmuri=tcm:14-610963&page=5&type=faq#Print%20head%20is%20not%20installed.%20Install%20the%20print%20head.%20U051/The%20type%20of%20print%20head%20is%20incorrect.%20Install%20the%20correct%20print%20head.%20U052
" Print
head is not installed. Install the print head. U051/The type of print
head is incorrect. Install the correct print head. U052
Follow the directions given in your setup sheet to install the Print Head.
If the Print Head is already installed, remove the Print Head once and then reinstall it."
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