Lexmark X7500 Service Manual - Page 16

4036-501 DADF Control Components • DADF Control Card The card controls all DADF functions, executes commands sent from the MFD controller cage, and sends information back to the MFD controller cage. • Top Cover Open Switch The switch detects the jam access door assembly in the DADF is either opened or closed. • Pre-registration Sensor 1 This sensor detects top of paper and sends a signal for making the paper standby just before the registration roll. • Pre-registration Sensor 2 This sensor detects top of paper and sends a signal for making the paper standby just before the large roll. • Size Sensor The sensor detects paper size. The passing paper uses three actuators on the size sensor card and turns them on and off respectively. The originated signal is transmitted to the MCU card. • Encoder Sensor The sensor detects the number of registration roll drive motor rotations. • Paper Present Sensor This sensor detects the paper loaded in the DADF. • Pick Up Sensor The sensor detects the existence of paper. This sensor utilizes a timing control of the paper conveyance as well as analyzes and recognizes the length of paper. 1-6 Service Manual