HP CM6030 Service Manual - Page 267
ADF, Input tray, ADF simplex-printing operation sequence,
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ADF Input tray The wide-media sensor (S1) and the long-media sensor (S2) are positioned at the input-tray assembly. These sensors allow firmware to detect how A4 and letter media sizes are positioned (in portrait or landscape mode). Figure 5-63 ADF operation Deskew Separation Roller Pick Roller Input Tray S1 S4 S3 S2 S5 S6 Exit Prescan Diverter Drive Roller Duplex Path Postscan Part Drive Roller ADF simplex-printing operation sequence 1. The jam-cover sensor (S3) is interrupted when the jam cover is closed, and 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. 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 feed motor rotates counterclockwise, driving the media into the prescan sensor (S6). 9. The firmware registers the position of the leading edge of the media while the prescan sensor (S6) is activated. 10. The feed motor continues rotating counterclockwise, driving the leading edge of the media through the preset distance from the prescan sensor (S6) to the scan zone. 11. When the media arrives, the scanner scans and retrieves data. 12. The prescan sensor (S6) is not interrupted when the trailing edge of the media passes it. 13. The firmware sequence registers the trailing edge of the media position. 14. The feed motor continues rotating counterclockwise, driving the media trailing edge through the preset distance from the prescan sensor (S6) to the scan zone. 15. The scanner finishes scanning and retrieving data. 16. The feed motor continues rotating counterclockwise, driving the trailing edge of the media past the scan zone. 17. The solenoid clamps the exit pinch rollers with ENWW ADF 221