HP LaserJet Enterprise M552 - Document feeder system (M577); Document feed system; Sensors in the document feeder

Document feeder system (M577)
NOTE: This section is for the M577 printer only.
Document feed system
This section describes the following:
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Sensors in the document feeder
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Document feeder paper path
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Simplex single-pass scanning
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Electronic duplexing (e-duplex) single-pass scanning
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Deskew operation
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Document feeder hinges
The printer supports single-pass electronic duplexing (e-duplex) copy jobs. Two separate scan modules scan
the front-side and back-side of an e-duplex copy job page in a single pass through the document feeder.
For the M577c/z models, the document feeder supports a smart background, which auto-crops and adjusts
the image extents.
Sensors in the document feeder
The document feeder contains the following sensors:
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ADF paper present sensor: Detects whether a document is present in the document feeder. If paper is
present in the document feeder when copies are made, the printer scans the document using the
document feeder. If no paper is present when copies are made, the printer scans the document using
the scanner glass.
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ADF Y (length) sensor: Detects whether a legal-size original is present in the document feeder.
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ADF jam cover sensor: Detects whether the document feeder cover is open or closed.
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ADF paper path deskew sensor: Detects the top of the page as it enters the deskew rollers.
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ADF paper path pick success sensor: Detects a successful one page feed from the document feeder
tray.
NOTE: This sensor uses ultrasonic sound to detect a multi-page paper feed.
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Paper path sensor 1: Detects the top of the page as it approaches the front-side scan module
(document feeder glass).
ENWW Document feeder system (M577) 71