Canon 4204B019AA User Manual page 127

Colors are uneven, and print results are blurred.
Tip!: Print the nozzle check pattern to check if the nozzles are
clogged.
If the print head nozzles are clogged, colors may become uneven or the print results may be blurred.
In this case
Print the nozzle check pattern
Check the printed check pattern to see if the nozzles are clogged.
See .
When Printing Becomes Faint or Colors Are Incorrect
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