EPSON ET 4550 how to clear blocked printhead. Eco Tank

If you can't clear a blocked printhead on your Epson Eco Tannk ET4550 type printer then it's possible that some of the tubes are blocked or the cartridge has an air bubble in it. Try this. EPSON ET2500,EPSON ET2550,EPSON ET4500,EPSON ET4550,EPSON ET2650,EPSON ET2610,EPSON ET16500 Cartridge World Castle Hill Australia.