Canon Pixma MX520 Series Online Manual page 76

Important
Check if the FINE cartridge is installed correctly.
The machine cannot print unless both the color FINE cartridge and black FINE cartridge are installed. Be sure
to install both cartridges.
6. Close the paper output cover (H).
Note
If the error message appears after the paper output cover is closed, take appropriate action.
A Message Is Displayed
When you start printing after replacing the FINE cartridge, the machine starts cleaning the print head
automatically. Do not perform any other operations until the machine completes the cleaning of the print head.
If the print head is out of alignment, as indicated by misaligned printed ruled lines or similar symptoms, adjust
the print head position.
Aligning the Print Head
The machine may make noise during operation.
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