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It may also disable the scan function in some MFC models, so we do not recommend it. This will include messages about paper supply, paper jams, etc. You can disable all warnings to stop the low ink message showing, but this will disable ALL notifications. You may have to do this every time you print. If you get a warning on your computer or LCD screen, just press or click OK to carry on printing. This button will flash with an orange light when the warning pops up, so it will be relatively easy to find. When the low ink warning appears, press and hold the STOP/RESET or RESUME button on the printer for 10 seconds. WARNING: If you use an ink cartridge that has a separate printhead (like the HP 920XL or HP 940XL), running a cartridge until it is empty or nearly empty may damage the printhead. It may also disable the scan function in some All-In-One printers, so we do not recommend it. In some cases you may need to click or press OK every time you want to print. When the dialogue box pops up on your computer screen, you can click on the box next to the message ‘Do not show this warning again’. Some printer models do give you the option to not have the message show again. When the low ink warning appears, press or click OK to disable the message. In most cases you will only need to replace the ink cartridge when print quality begins to fade. Luckily, these warnings can be bypassed pretty easily. With most remanufactured cartridges (like the HP 56 ink and the Canon PG-512 ink), these chips cannot be reset and you’ll occasionally get a low ink warning, even when the ink cartridge is full. When the cartridge has printed about 75% of those estimated pages, the chip tells the printer to let you know the cartridge is almost out of ink. The chip is preloaded with a set amount of pages the cartridge can theoretically print, based on standardised page yield tests. For most cartridges, however, this is not possible and this is where the chip comes in. Light only works if the ink cartridge is clear (like the Canon PGI-450XL ink), here the printer shines a laser light through the cartridge and physically reads the level of ink in the tank. There are two ways a printer can figure out ink levels in a cartridge, light or a chip.