What triggers the need for a re-alignment of the PDA?

The need for a re-alignment of the PDA is triggered if it doesn’t respond to touch commands properly. This situation indicates that the device may not accurately recognize where the user is attempting to touch the screen, which can lead to operational issues and impede the user’s ability to navigate effectively. Proper alignment ensures that touch inputs are registered accurately, allowing for smooth operation and enhanced user experience.

While other options may suggest conditions under which a PDA might need attention, they do not specifically relate to the calibration required for touch sensitivity. For instance, running out of battery could halt functionality, but it doesn't inherently relate to alignment issues. Similarly, requiring re-alignment after a set number of uses or based on staff requests is not standard practice and does not address the direct symptom of touch command misrecognition. Thus, proper device maintenance hinges on the responsiveness of the touchscreen, validating the choice regarding the need for re-alignment when touch inputs are not recognized correctly.