How to refill HP toner cartridge CF244A, CF247A, CF248A, Hp 44A for laser printers HP Laserjet Pro MFP M15, M15a, M15w, M16, M16a, M16w, M28a, M28w, M29a, M29w, MFP28. What you need: - HP black toner powder - HP244A chip How to clean a drum: https://www.youtube.com/watch?v=39Knu8KllTw Toner cartridges troubleshooting guide: https://www.youtube.com/watch?v=9X3C9KkPClc For any question or suggestion leave a comment If this video was useful thank you for the help: Paypal zvallid@gmail.com ----------------------------------------------------------------- email: link.accessori@libero.it other links: http://www.emmegiricambi.it/ http://store.hp.com/us/en/cat/printers -----------------------------------------------------------------