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. Please verify you have purchased a new Brother Genuine cartridge by following the steps on this website: https://www.brother-usa.com/supplies/ink-and-toner/security If you have any questions about your Genuine cartridge, please contact Brother customer service at www.brother-usa.com/support.

We understand that you are unhappy with the Brother TN-730 toner cartridge and we'd like to help. The Brother TN-730 toner cartridge yields approximately 1,200 pages based on the ISO/IEC 19752 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. Print jobs with large text fonts, graphics, charts, and/or large amount of solid coverage will use much more toner and, naturally, will shorten the life of the toner cartridge. If you feel you have printed less pages than advertised, feel free to contact Brother Customer Service directly at https://www.brother-usa.com/brother-support

Hello, The stated page yields for genuine Brother TN730 toner 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. We will be happy to help you with the vertical lines you are experiencing. Brother Customer Support Team is available to assist you direct: www.brother-usa.com/brother-support

Thanks for taking the time to review your experience with the Brother TN730 toner. We appreciate your feedback. I’m sorry to hear that you are having toner yeild not as expected with the Brother TN730 toner. I sincerely apologize for any inconvenience this issue may have caused you. We’d like an opportunity to help. Please contact us directly at: https://www.brother-usa.com/support