Brother International HL 1850 Service Manual - Page 97

HL-1850/1870N SERVICE MANUAL 2.3.3 DX tray sensor I DX paper size sensor The DX tray sensor detects if the DX tray in installed, and the DX tray size sensor detects if the correct size of paper is selected. I DX sensor PCB assy Fig. 3-26 2.3.4 Rear cover sensor Detects opening and closing of the rear cover. It also detects an error if the rear cover is open when duplex printing is selected. Exit roller unit Rear cover sensor I Fig. 3-27 3-25