A printhead assembly for a pagewidth inkjet printer, having an array of printhead modules mounted to an elongate channel extending substantially across the pagewidth. A flexible printed circuit board carrying data and power to said modules and an elastomeric ink delivery extrusion are situated between the modules and the channel. More particularly, the flexible printed circuit board is sandwiched between the elastomeric ink delivery extrusion and the channel so that it extends around one edge of the extrusion to carry power and data to the printhead modules.