Canon ipf8300 User Manual page 1022

Maintenance > Printheads
3.
If the ventilation duct (a) is dirty, use a damp cloth that you have wrung out completely to wipe it clean.
If the Carriage is obscuring the ventilation duct, move the Carriage manually before cleaning the duct.
4.
Pull up the Carriage Cover to open it completely.
11
1004
Replacing the Printhead
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iPF8300