HP vertical line not straight or it breaks into several short lines like stairs

[zillah]

Hi Experts

I have got HP OfficeJet Pro L5790 recently I realized when I print the lines through a page are not straight ,,,,means vertical line not straight or it breaks into several short lines like stairs when printing.

I guess the printer needs to be aligned


I tried the below but it was not helpful


http://www.essortment.com/articles/align-print-cartridge-hp_101947.htm


Any idea how can I do that ?


Thanks