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Most of the time, your printer will notify you of which part needs to be replaced, but it is still helpful to know the difference between a toner cartridge and a drum unit.
Stored in a toner cartridge, toner is a powder ink substance that transfers on to the paper to create text and images. An imaging drum is the unit within the printer that writes the images and text from the computer and then passes them to the page using toner.
As mentioned above, your computer and/or printer will inform you when you need to replace the toner cartridge or the drum unit. Once the toner becomes low in its cartridge, you will be advised that replacement is near. After several toner cartridge replacements, it is likely that youíll need to replace the drum unit.
Signs of wear are similar for both the toner cartridge and drum unit. Black lines and spots will appear on printed pages. If you are unsure of which you need to change, pay attention to your printerís updates!