Touch Panel The panel touch sensing system consists of a touch sensitive resistive membrane covering the display. Contrarily to other systems using infrared beams, the screen has to be physically ‘‘touched'' to make it work. The display has capability of an almost infinite number of touch locations. However, to be compatible with earlier systems, the software only senses the locations shown on the diagram screen below. Every possible touch button position is shown on this diagram screen. Touching one of these should cause its color to reverse, and sound a ‘‘beep''. If the touch locations are off slightly (by less than one touch location), use the ‘‘Touch Panel Calibration'' diagnostic to re-align the touch ‘‘zones'' with the screen image. If any areas of the screen either don't respond, or respond at some other location when touched, the replace the display unit. |