Scanning/image capture system
Scanner
The scanner is a carriage-type platen scanner which includes the frame, glass, LED optics, and a
scanner controller board (SCB) attached to the back of the assembly. The scanner has two sensors to
detect legal and ledger/A3 sized media and a switch to indicate when the ADF is open.
The ADF and control-panel assembly are attached to the scanner assembly. If the scanner fails, it can
be replaced as a whole unit. The scanner replacement part does not include the document feeder, SCB,
or control-panel assembly.
Document feeder system
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Simplex single pass
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Duplex three pass
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Length-short and length-long sensing flag
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Pick and feed roller assembly with separation pad
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Mechanical deskew
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Step glass for ADF scanning
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Jam clearance door with sensing
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LED indication when original is placed on input tray
Sensors in the ADF
The ADF contains the following sensors:
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ADF-cover sensor: Detects whether the ADF cover is open or closed.
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Paper length sensors: Detects whether there is a letter/A4, legal, or ledger/A3 size original.
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Pick success sensor: Detects the top of the page before sending a page through the ADF and
the end of the page after feeding/scanning is complete.
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Paper-present sensor: Detects whether a document is present in the ADF. If paper is present in
the ADF when copies are made, the product scans the document using the ADF. If no paper is
present when copies are made, the product scans the document using the scanner glass.
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Deskew sensor: Detects the top of the page as it enters the deskew rollers.
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Path sensor 1: Detects the top of the page as it approaches the ADF glass.
68 Chapter 1 Theory of operation ENWW
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