HP CM6030 Service Manual - Page 269

position. 14. The feed motor continues rotating counterclockwise, driving the media trailing edge through the preset distance from S6 to the scan zone. 15. The scanner finishes scanning and retrieving data. 16. The solenoid activates when the trailing edge of the media passes the scan zone by a predetermined, constant distance from the prescan sensor. This allows the exit pinch rollers to clamp the exit drive roller, driving the remaining media out of the scan zone and past the diverter. 17. The feed motor rotates clockwise, driving the media in a reverse direction. This moves the media into the duplex path, the deskew drive roller, and the deskew pinch rollers. 18. A preset amount of overdrive of media into the nip point is carried out to create a buckle for pick-skew correction. 19. The solenoid activates when the trailing edge of the media passes the scan zone. This allows the exit pinch rollers to clamp the exit drive roller, driving the remaining media out of the scan zone and past the diverter. Figure 5-65 Duplex scanning document path Pap er I n Pap er O u t Scan L i n e 1st Pass 2nd Pass 3rd Pass Multifeed operation 1. The jam-cover sensor (S3) is interrupted when the jam cover is closed. The media-presence sensor (S4) is interrupted when media is loaded on the input tray. 2. The feed motor rotates clockwise, lowering the pick roller. A cutout on the gears on the side of the lid ensures the proper rotation distance. 3. The pick motor rotates counterclockwise, driving the pick roller to pick media. 4. The deskew sensor (S5) is interrupted when the leading edge of the media is driven past it, and the firmware registers the position of the leading edge of the media. 5. The leading edge of the media is driven into the nip point of the deskew drive roller and deskew pinch rollers. A preset amount of overdrive of media into this nip point is carried to create a buckle of media for pick-skew correction. 6. The pick motor rotates clockwise, rotating the deskew drive roller to pull media into the prescan drive roller. 7. The transmission gears for the pick and separator rollers disengage from the gear train, allowing the pick and separator rollers to free-wheel while media is pulled in by the deskew drive roller. 8. The ENWW ADF 223