HP M5025 - LaserJet MFP B/W Laser - Page 181

with the exit drive rollers before the trailing edge of the media leaves the post-scan drive roller and exit
pinch rollers. 18. The feed motor continues rotating counterclockwise to drive the media out of the ADF
paper path via the exit pinch roller and exit drive-roller.
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Figure 4-38 Simplex scanning document path
ADF duplex printing operation sequence
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 pick and separator rollers transmission gears 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 continues
rotating counterclockwise to drive the leading edge of the media through the preset distance from S6 to
the scan zone.
11. When the media arrives, the scanner scans and retrieves data. (S6 is not interrupted when the trailing
edge of the media passes it.) 12. The firmware sequence registers the trailing edge of the media position.
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