After print head replacement on a printer, it needs:

A.
alignment.

B.
lubrication.

C.
cleaning.

D.
driver reinstallation.

Explanation:

http://www.epson.com/cgi-bin/Store/Video-Library/video/Printers-All-in-Ones_PopularPrinters-All-in-Ones/How-to-Align-a-Print-Head/929642678001?BV_UseBVCookie=yes