A cleaning pad that is part of a printer developer customer replaceable unit cleans a laser aperture each time the customer replacement unit is removed andor replaced. The tiles operate to move a requested value to a front-most storage element of the tile array according to a global systolic clock. A communication method and a radio network system for the mobile terminal apparatus are also disclosed. The isolation structure and ESD protection devices are fabricated using a modular process that includes virtually no thermal processing.