Canon MP490 series On-Screen Manual page 76

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See step 1 of Examining the Nozzle Check Pattern
If the problem is not resolved, turn off the power and clean the Print Head deeply again after 24 hours.
If the problem is still not resolved, replace the FINE Cartridge with a new one.
See Replacing a FINE Cartridge .
If the problem is still not resolved after replacing the FINE cartridge, contact the service center.
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