Canon MF419x User Manual page 803

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If Printouts are Poor in Quality
If your printouts begin to show any of the following features, one of your toner cartridges is nearly empty. Replace the
nearly empty toner cartridge even if no message is displayed.
Streaks appear
Afterimages appear in blank areas
● If, of the above symptoms, "Streaks appear," "Partially faded," or "Uneven density" appears, performing the
procedure for Using Up Toner(P. 796) may allow you to get fine print again, for some limited time.
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Checking the Amount Remaining in the Toner Cartridge
You can check the amount remaining in the toner cartridge according to the following, whenever you want to. It is
recommended that you check the level before you start to print a large job.
toner cartridge
Partially faded
White spots appear
<Device Status> <Amount Remaining in Cartridge>
Maintenance
How to Replace Toner Cartridges(P. 798)
Uneven density
794
Check the amount remaining in the