Brother MFC 9420 9420CN 9420N TN04BK TN04 Black Toner Refill Kit. By Toner Eagle Toner is designed specifically to work in the TN-04BK toner cartridges for use in Brother MFC-9420, MFC-9420CN, MFC-9420N laser printers. We test many toner samples from toner manufacturers. Most are rejected as they do not meet the look and specifications of the OEM toner. The toner we sell DOES match OEM toner! You will save up to 80% on the cost of your toner cartridges. Refilling your own toner cartridges is more environmentally friendly than buying new, compatible, or even remanufactured toner cartridges. We provide easy-to-follow instructions with photographs of the process. The process is so easy that most people do not need help. But if you do need help, we're just a phone call away! We guarantee that you will be happy with your purchase or we'll refund your money.