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 are sorry that you are experiencing issues with the Brother TN-730 toner cartridge and we understand your disappointment. This toner yields approximately 1,200 pages based on 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.). If you feel that the cartridge did not yield as advertised, please contact us directly at: www.brother-usa.com/brother-support

We are sorry that you are experiencing yield issues with your Brother MFCL2710DW machine. We'll be happy to help you. Our Brother Customer Support Team is on stand-by to provide quality products and service to our customers via online, email or live chat: www.brother-usa.com/brother-support. Keep in mind that 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 contact us if your need any clarification related to the toner cartridge usage for your Brother machine.

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