Figure 1-8 Switches (Tray 3 and Tray 4) M8001 PS8008 SL3 PS451 SW461 Table 1-7 Switches (Tray 3 and Tray 4) Item Description 1 Tray 3 and Tray 4 are identical 500-sheet input trays. SW461 Paper feeder cassette presence switch ENWW Engine-control system 11 C L1