Canon MG6400 series Online Manual page 156

Important
When opening or closing the operation panel, do not touch the buttons and LCD on
the operation panel. Doing so may result in an unexpected operation.
Note
If the error message appears after the operation panel is closed, take appropriate
action.
A Message Is Displayed
When you start printing after replacing the ink tank, 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
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