A marking apparatus including a traveling wave grid toner transport circuit structure for transporting powdered toner along a transport surface, and electric field concentrating elements for selectively enabling toner patches to be projected to an output medium by a projecting electric field. The printed wiring board includes a board recognition mark formed of a conductive foil, a first component land covered with resist, and a second component land not covered with the resist. Typically, a projector outputs randomly-polarized light.