Lift: When no more paper is detected in the ADF input tray and the trailing edge of the last page is detected by the form sensor, the last sheet is ejected and the motor turns in a sequence which lifts the pick roller assembly to standby or “paper loading” mode again. The ADF will not function with the ADF door open. The paper path is incomplete if the ADF lid is lifted from the glass. ADF paper path and ADF sensors The following figure shows the ADF paper path. Pick roller Paper present sensor Stack stop Pre-pick roller Picks top sheet ADF door open sensor INPUT TRAY Separation pad Cleanout PAGE EJECTS FULLY Form sensor OUTPUT AREA Postscan rollers Prescan rollers ADF glass Figure 12.
Document scanner path The paper present sensor determines if paper is in the ADF. The form sensor detects the top and bottom edges of the document. One other sensor detects an open ADF door. 82 Chapter 4 - Operational overview EN