A modular print head strategy gives the capability to move Xerox's inkjet technology from the desktop and office area to the higher speeds required for the production market. An array of 3 inch print heads can be used to print images at speeds faster than 300 feet per minute. The heads use a non-aqueous, phase change ink which is solid at room temperature. When jetted, the solid ink sits on the surface of the paper, which decreases image bleeding and show through and would eliminate the need of a drier and media preconditioning. An image on web array (IOWA) sensor can continually monitor test patterns during printing. This IOWA sensor can enable color to color registration, image uniformity, and jetting efficiency to be continually monitored and adjusted during printing.