When the original set sensor [1] detects an original and the machine has a copying or scanning job, the ADF motor rotates to drive the pick-up roller [2], separation roller [3] and feed roller [4] to feed the original to the ADF feed sensor [5]. If the ADF feed sensor [5] does not detect paper after this sequence, the machine determines that an original jam has occurred.
If the ADF feed sensor [5] detects paper, then the CIS starts scanning through the exposure glass [6]. After scanning, the output roller [7] will eject the paper to finish the job.