How Does The Cartridge Work? To print text and images printers utilize cartridges of ink. Each cartridge has all the necessary ingredients and technology to create sharp and clear prints. The printer will display an error or a warning screen, based on the age of the cartridge, indicating that it's time to replace the cartridge. There are two options to choose from to replace the entire cartridge, or select one of the options for maintenance, such as cleaning and inspection. It is possible to select maintenance mode to replace the entire cartridge. Follow the directions to ensure your printer isn't damaged. https://www.cartridgesave.co.uk/toner-cartridges/Canon/IR-C5235i.html