MPI TN-550 / TN-580 Compatible Laser Toner Cartridge

• Compatible Cartridge Replacement
• Non-OEM
• 2 Year Warranty
• Satisfaction Guaranteed or Your Money Back

Brother has decided to start including an optical toner level checker in their printers. It is much to sensitive (incompetence or geed, you decide). At some point you''ll print a page out of your printer, it will look perfect, then the printer will refuse to go on because it is out of toner or has low toner. This is a good time to go ahead and buy your replacement; however, you''ve still got a couple hundred good pages and a couple hundred so-so pages in your current cartridge...

Turn your printer off

Open the front

Pull the cartridge / drum out

Eject the cartridge from the drum (tab on the side)

Look on the edge of the cartridge without drive gears and find the clear plastic grommet eye thing

Confirm you''ve got the right one by finding a match for it on the drive side

Go back to the non-drive side (b/c it is easier to get to) and black it out (marker / electric tape)

Put everything back together

Turn on printer

Print, FTW.

The printer "looks" through the cartridge waiting for the toner to drop under the level of the eyes at which point it refuses to print despite being able to do hundreds more perfect pages. By blacking out one of the eyes you fool it into being always full. You''ll just have to recognize the drop in print quality that''s significant enough to make you change cartridges.

As for this cartridge, I''ve got no idea if it is any good or not because, I''m still using my DIY faked cartridge.