Hello, stated page yields for genuine Brother cartridges are based on the ISO testing standards. The number of pages that can be printed with a cartridge is affected by several factors, including paper size, number of pages per print job, amount of print on each page, font size, and print content (graphics, charts, etc.). Print jobs with large text fonts, graphics, charts, and/or large amount of solid coverage (black or any given color) will use much more toner and will shorten the life of the toner cartridge. If you continue to have issues, our Brother Customer Support Team is available to assist you direct: www.brother-usa.com/brother-support

We understand you're experiencing issues with your Brother TN730 toner cartridge not working. We'd like to help. Please contact our Customer Service department and we will work with you to resolve this issue. Brother Customer Support Team is available to assist you direct: www.brother-usa.com/brother-support