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To try and resolve the U052 error on your PIXMA MP550, please remove the ink tanks and print head from the printer, then reseat them. If you still experience the same issue, please turn off the printer, unplug the power cord from the back and leave it out for at least 10 minutes, then plug it back in and turn it back on. If the issue is still unresolved, unfortunately, the printer will require servicing to resolve the issue.
You can contact Cannon here: Canon Contact Us
This information originally from: My printer Canon MP530 stopped working with an Canon Forum (also has a walk through for removing the printer head and ink cartridges.)
Just so you know, the 530 and 550 are the same machine, except the 550 has a few small improvements.
Posted on Apr 01, 2014
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Posted on Jan 02, 2017
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