A control unit for actuating a pressure valve, particularly for actuating an overpressure valve in an aircraft cabin, comprises an actuating body and a pressure-controlled actuator for the actuation of the actuating body as a function of a predetermined threshold pressure valve, wherein the threshold pressure value can be adjusted by means of an adjustment device. The IFE system is configured to be situated in an active use position wherein a user may interact with the touch screen and also use a tray table. The systems, methods, and programs adjust, for each sheet whose orientation is not consistent with the marking data, the marking data for that sheet such that the marking data for that sheet is consistent with the orientation of that sheet. The disclosed embodiment further comprises at least one via in the substrate, which provides an electrical connection between a signal bond pad of the semiconductor die and the printed circuit board.