This GPCImage TN227 4 piece replacement toner cartridge works well with my MFC-L3770CDW color printer. Ammo loads with no problems. After the installation was complete, I made a test print after calibration (see attachment). Text was crisp and colors were vibrant. Cartridges are shown as non-original but I'm happy with the non-original price. Then I duplexed 56 pages and the last page looked just as good as the first. There is also an 800 number you can call if you need it. I highly recommend this company.
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