When a user give instruction to the printer to print then sometimes, a warning message appears in computer screen which tells us that the toner of the printer is low or the cartridge is empty. It is the HP Toner Chips that monitors the amount of toners and give warning messages to the printers. The Toner Chip is programmed to monitor and count the number of droplets used in the printing. If the user don't reset or replace the this Chip then the warning sings continuously appears and printer refuses to print the document. 

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