Change the toner cartridge when the printer indicates a low level or when print quality deteriorates. To change the toner, turn off the printer, open the front panel, remove the used cartridge, insert the new cartridge after removing the protective seals, then close the panel and turn the printer back on. We recommend printing a test page to verify the installation. Some of our monochrome laser printers are compatible with the Refresh Subscription, too, which anticipates toner refills to ensure you never run out of toner and eliminates the need to manage it yourself.