How to Replace a Cartridge in Canon 420 Printers

by Scott Knickelbine

The Canon imageCLASS D420 is an all-in-one printer/copier. Unline most of Canon's printer line, however, it is a laser printer, not an inkjet printer. This means you'll need to pull out and replace a large toner cartridge rather than replacing individual ink cartridges. But replacing the cartridge on the D420 is easy and requires no special tools; the procedure is similar to that used for most other monochrome laser printers.

Lift the scanning platform by grasping the control panel on both ends and raising until the platform clicks into place.

Grasp the grip on the right-hand side of the toner cover and lift it.

Remove the old toner cartridge by grasping it by the center handle and pulling it out.

Remove the new cartridge from the package and gently rock it back and forth a few times to distribute the toner.

Grasp the orange seal tape on the left-hand side of the cartridge and pull it completely out.

Grasp the toner cartridge by its center handle and insert it so that the small plastic guide knob on the right-hand side of the cartridge fits into the guide slot on the right side of the machine. Slide it down into the machine until it is fully inserted.

Close the toner cover and the scanning platform.


  • check If your printer is giving you a low toner message, try redistributing the toner before you replace the cartridge. Remove the cartridge and gently tilt it back and forth several times before replacing it.
  • check Canon offers a recycling program for used toner cartridges. In addition, some office supply chains will give you a trade-in credit on your old cartridge.


  • close Once the seal has been removed, the cartridge may spill toner. If you get it on your hands or clothes, wash immediately in cold water. Remember that laser printer toner is heat-set; if you use hot water, you may set the toner permanently.
  • close Do not touch the rollers and other parts with warning labels on them. These parts become very hot during normal printer operation and may cause burns.

Items you will need

About the Author

Scott Knickelbine began writing professionally in 1977. He is the author of 34 books and his work has appeared in hundreds of publications, including "The New York Times," "The Milwaukee Sentinel," "Architecture" and "Video Times." He has written in the fields of education, health, electronics, architecture and construction. Knickelbine received a Bachelor of Arts cum laude in journalism from the University of Minnesota.

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