HP LaserJet Enterprise M552 - Document feeder simplex operation

Table 1-27 Document feeder paper path (continued)
Item Description Item Description
3 Pick roller 9 ADF pick success transmitter
4 ADF pick success receiver 10 Separator roller
5 Deskew drive roller 11 Exit drive roller
6 Prescan drive roller 12 Lift plate
Document feeder simplex operation
Following is the basic sequence of operation for a document feeder simplex job.
1. The ADF jam cover sensor detects when the cover door is in the closed position.
2. The ADF paper present sensor activates when paper is loaded onto the input tray.
3. The feed motor rotates to raise the lift plate and starts to pick the loaded paper.
4. The ADF multi-pick (ultrasonic) sensor activates when the leading edge of the media is driven past the
sensor. The printer rmware registers a successful pick operation.
5. The ADF paper path deskew activates when the leading edge of the paper passes it. The printer rmware
registers the leading edge of the paper position.
6. The leading edge of the paper drives into the nip point of the deskew drive roller and the deskew pinch
rollers. This creates a buckle of paper by the nip point for pick-skew correction.
7. The deskew motor rotates the deskew drive roller to pull the paper into the prescan drive roller.
8. The pick motor stops turning and allows both the pick and feed roller to turn freely while the paper is
pulled in by the deskew drive roller.
9. The feed motor rotates to drive the paper into the prescan front-side sensor. The rmware registers the
leading edge position of the paper as the multi-pick sensor activates.
10. The feed motor continues to rotate and drive the leading edge of the paper through the preset distance
from the multi-pick sensor to the front-side scan zone. The scanner begins the scanning and data
retrieval process.
11. The ADF multi-pick (ultrasonic) sensor deactivates when the trailing edge of the paper passes the
sensor. The rmware registers the trailing edge of the paper position.
12. The feed motor continues to rotate and drive the trailing edge of the paper through the preset distance
from the ADF multi-pick (ultrasonic) sensor to the front-side scan zone. The scanner ends the scanning
and data retrieval process.
13. The feed motor continues to rotate and ejects the trailing edge of the paper into the output bin.
14. One of the following occurs:
●
If the copy job is complete, the ADF paper present sensor deactivates. The feed motor reverses
rotation to raise the pick roller.
●
If the copy job is not complete, the ADF paper present sensor is active. The printer rmware
detects additional pages in the input tray and the process repeats.
ENWW Document feeder system (M577) 73