5 Paper-out sensor (PS001) senses whether or not media is loaded in the paper input tray. Paper must be loaded before printing can resume. 6 Document sensor (PS1) detects the presence of a document in the document feeder. 7 Document-top sensor detects the leading edge of a document in the document path. 8 Contact image sensor. 9 Paper-delivery sensor (PS201) senses when paper has successfully moved out of the fusing area. EN Printer functions 81