Patent ID: 8264516

Claim:
A document processing system comprising: a photoreceptor that continuously moves along a closed path; a plurality of raster output scanners (ROSs) located along the closed path of the photoreceptor, the ROSs individually operable to generate a latent image on a portion of the photoreceptor based on a clock input; a fixed frequency clock source providing a fixed frequency output signal to the ROSs; a numerically controlled oscillator-based adjustable frequency clock source providing an adjustable frequency output signal to the ROSs; and a controller coupled with the ROSs to selectively operate a given ROS according to the fixed frequency output signal if the latent image being generated by the given ROS is to be fixed to a first side of the substrate or according to the adjustable frequency output signal if the latent image being generated by the given ROS is to be fixed to a second side of the substrate, wherein the photoreceptor includes a plurality of image panel zones in which the ROSs generate latent images, with successive panel zones separated by inter panel zones, wherein the controller provides the ROSs with a control parameter indicating whether a latent image to be generated on an upcoming panel zone is to be fixed to a first side or a second side of the substrate, and wherein the ROSs individually select one of the output signals for use in generating a latent image on the upcoming panel zone based on the control parameter.