4036-304
Theory of Operation
System Description
The Lexmark X4500 is a duplexing scanner option which can synchronously scan both the top and bottom sides of a document in color. The major system components include a main scanner control board, an automatic document feeder, flatbed, two optical CCD modules (one in ADF, one in flatbed), a user interface with a touch screen panel and a multifunction device controller cage located within the base of the scanner. The MFD controller cage includes a 1394 communications card to communicate with the main scanner board (for generation 1 controller cards only; for generation 2 controller cards, the 1394 communications circuitry is built into the controller card), a MFD controller board to process all jobs performed on the X4500, a hard disk drive containing the operational code for the system and providing memory for processing jobs, and a power distribution board. An external power supply provides 5, 12, and 24 V dc to the entire scanner system.
The following figure shows the system block diagram.
Mechanical Operation
Flatbed Operation
When scanning, place the document on the flatbed glass platen, the flatbed optical unit/ carrier moves across the underside of the glass, and scans the document. A charge- coupled device (CCD) mounts to the carrier and optically reads the image from the page. The carrier is driven by a
Overview