Reset gear for use in Brother TN550 / TN580 toner cartridges. This gear is only needed if you are refilling STARTER* cartridges for the Brother TN550 / TN580, since the starter cartridges don't always have this reset gear installed. The printer displays a "toner life end" message if no reset gear is detected. A reset gear must be installed on any used TN550 / TN580 starter cartridge in order for the printer to function properly once the cartridge has been refilled and re-installed in the printer. * A starter cartridge is the cartridge that ships free with your printer. If you purchase the cartridge separatley, you will not require this gear. Each kit contains: 1 reset gear + instructions for assembly (easy to do!)
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