Canon imageCLASS MF753Cdw Multifunction Wireless Color Laser Printer - Manual (Page 613)

When to Replace the Toner Cartridges
When a Message Appears on the Screen of the Operation Panel or Remote UI
Follow the message on the screen to prepare a new toner cartridge and replace the old one. Print quality
may suffer if you continue using the toner cartridges without replacing them.
For details about the message and how to resolve it, see the following:
A Message Appears(P. 697)
When Print Quality Deteriorates
If printouts show any of the symptoms below, the toner cartridges are near the end of their lifetime. It is
recommended to replace the toner cartridges even if a message does not appear.
Streaks appear Printing is uneven Toner smudges and splatters appear
White spots appear Partially faded Colors or stains appear on printouts
Before Replacing Toner Cartridges
Perform the following procedure before replacing the toner cartridges. The message on the screen may disappear,
and the print quality may improve.
1
Open the front cover.
Maintenance
603