Figure 35. Paper-feeder driver I/O Pickup and feeding The media size and the presence of the 500-sheet tray are detected by three switches (SW1001, 1002, 1003) on the paper-feeder driver. The relationship between the switch combinations and the paper sizes is the same as for the printer. The paper feeder is driven by the main motor (M101) of the printer. When a print command is sent to the paper feeder from the formatter, the main motor of the printer starts rotation. When the main motor reaches its prescribed speed, the paper-feeder driver receives the pickup command from the engine controller board, and the paper-feeder pickup solenoid (SL1001) is activated.
(The pickup roller, feed roller, and separation roller are driven by the main motor’s rotation.) The pickup roller, activated by the solenoid, rotates once, picking up the media inside the 500-sheet tray. Any unnecessary sheets are removed by the separation roller and the media is fed to the prefeed sensor (PS102) of the printer. The sheet then reaches the registration assembly, where its skew is corrected. Then it goes through transfer, separation, and fusing stages; passes through the delivery unit; and is delivered to the output bin. (For more information, see the graphic on page 252 in chapter 7.) EN Chapter 5 Theory of operation 125