I’m using HP 4520 printer for printing the documents from a long period. I have full knowledge of using all the advanced functions of this wireless printer, so I prefer this printing machine for printing purposes. When I give a suitable command to my HP 4520 printer for printing the urgent documents, my printing machine goes offline mode. I am facing HP 4520 printer offline error, so I am not able to get the print out correctly. I don’t have enough knowledge to find out the main reasons of this offline issue. So anyone can recommend the simple ways to sort out this offline problem.