Media jam detection The controller board checks if paper is at the appropriate sensor at the proper time. If the controller board detects a media jam, the printer stops printing and signals a jam condition to the formatter board. Printer timing The formatter PCA and controller board PCA share information during the printer operation. This information consists of printer status, command, and dot-image data. Figures 61 through 66 show the timing of different printer events. 192 Chapter 5 - Theory of operation EN