Chapter 22-10F-2-142.3.3 Original Size Detection 1 0011-2242In original size detection 1, the original trailing edge sensor is used (S7), which is designed to identify the original in the original tray as being small-size or large-size.When the original covers the original trailing edge sensor, the light from the LED of the original trailing edge sensor is reflected by the original to hit the phototran-sistor, at which time the DADF identifies the original as being large-size.The DADF sends original size data (small-size or large-size) to the copier, which uses the data to determine the point at which the scanner is stopped for streamreading.Small size: A5, A4, B5, STMT, LTRLarge-size: A4R, B5R, A3, B4, LTRR, LGL, 279.4X431.8mm (11"X17")ADF controller PCBS6 (light-receiving side)S6(light-emitting side)S6(light-receiving side)ADF controller PCBWhen an original is detected When no original is detectedS6(light-emitting side)S6(light-receiving side)ADF controller PCBDTS signalDTS signalOriginalLight is blocked.S6 (light-emitting side)
