2-4 WorkCentre C2424 Service ManualDocument Feeder FunctionsThe WorkCentre C2424 Copier-Printer includes a Duplexing Automatic DocumentFeeder (DADF). It is capable of automatically feeding original documents from theinput tray and scanning either a single-sided document or both sides of a double-sideddocument.Input Tray: The input tray feeds document originals into the DADF for simplex(single-sided) or duplex (double-sided) scanning. It has a capacity of 50 originals.Output Tray: Original documents fed through the DADF exit to the output tray.Media Present Sensor/Media In Sensor: The media in sensor detects thepresence of original documents in the input tray. After a delay to allow for adjustingthe feed guides, the media will stage to the this media staged sensor.Media Staged Sensor: This sensor, located within the DADF scanhead, detectswhether media has been fed into the DADF to a predetermined (staged) point. Whenthe scanner detects this point, it starts collecting data from the Charge CoupledDevice (CCD).DADF Cover Open Sensor: This optical sensor detects the status of the DADFaccess cover. When the cover is open, DADF operation is inhibited; given sufficienttime, an error message appears on the control panel display instructing the user toclose the access cover.Pick Roller and Separator Pad: The pick roller is the first of several feed rollers.It is designed to work with the separator pad to ensure that only one sheet of media isfed at a time.Feed Rollers and Idler Rollers: Three additional feed rollers in the DADF areresponsible for media transport through the media path. They include associated idlerrollers to maintain proper media tension. This ensures proper imaging whileproviding the minimal chance for damage to the original document(s).Drive Motor: A stepper motor is housed in the DADF to drive the pick and feedrollers, and moves the calibration shutter into position. The connection is through atoothed belt and gear drive. This connection and the vibration mounts that the motoris mounted to help reduce vibrations introduced into the system.DADF scanhead and Lamp: The DADF utilizes a stationary scanhead containingthe imaging CCD. This scanhead is only for scanning the second side of a duplexoriginal. The lamp is a Cold Cathode Flourescent Lamp (CCFL).NoteThe CCFL is powered through a chopper board. It is supplied with a variable DCinput (Up to +24 VDC) and generates +600 VDC to +900 VDC depending on thesupply voltage.
