HP M5025 Service Manual - Page 182
Multifeed operation,
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13. The feed motor continues rotating counterclockwise to drive the media trailing edge through the preset distance from S6 to the scan zone. 14. Then, the scanner finishes scanning and retrieving data. 15. 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 to drive the remaining media out of the scan zone and pass the diverter. 16. The feed motor rotates clockwise to drive media in a reverse direction. This moves media into the duplex path, the deskew drive roller, and deskew pinch rollers. 17. A preset amount of overdrive of media into the nip point is carried out to create a buckle for pick skew correction. 18. The solenoid activates when the trailing edge of media passes the scan zone. This allows the exit pinch rollers to clamp the exit drive roller to drive the remaining media out of the scan zone and pass the diverter. Pap er I n Pap er O u t Scan L i n e 1st Pass 2nd Pass 3rd Pass Figure 4-39 Duplex scanning document path Multifeed operation 1. The sensor jam cover (S3) is interrupted when the jam cover is closed. The sensor media presence (S4) is interrupted when media is loaded on the input tray. 2. The feed motor rotates clockwise to lower 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 to drive the pick roller to pick media. 4. 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 to rotate the deskew drive roller to pull media into the prescan drive roller. 7. Then, the transmission gears for the pick and separator rollers disengage from the gear train. This allows the pick and separator rollers to free-wheel while media is pulled in by the deskew drive roller. 8. The feed motor rotates counterclockwise to drive media into the prescan sensor (S6). 9. The firmware registers the position of the leading edge of the media while S6 is activated. 10. The feed motor 152 Chapter 4 Theory of operation ENWW