Canon MF229dw User Manual page 360

The following may occur.
Definition may be affected
Toner appears in non-print areas when using a new toner cartridge
Toner may be used up more quickly
Special Mode K
If toner does not adhere adequately and printouts are faded, select <On>.
Off
On
<Menu>
When set to <On>
Print speed is slower.
Clean Fixing Assembly
Clean the fixing assembly after a toner cartridge is replaced or if black streaks appear on printouts.
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<Adjustment/Maintenance> <Special Processing> <Special Mode K> <On>
Fixing Assembly