Dell Multifunction Laser Printer 5535dn, Руководство по обслуживанию

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Diagnostic aids
3-69
Sensor (FB scanner HP)
A sensor that detects the HP position of the flatbed scanner CCD assembly.
Scanner exposure lamp
A xenon lamp to which the document is exposed.
Scanner controller card assembly
A card that controls the scanner section.
Scanner cooling fan
A fan that prevents overheating of the scanner controller card assembly and exposure lamp.
A document sheet set in the document tray assembly is fed through the ADF feed roll, ADF pick roll, and ADF
separation roll assembly. The document image is scanned at the scan position, and the document sheet is
ejected through the ADF feed-out roll assembly and the ADF exit roll assembly. For a duplex document sheet,
the image on side 1 and the image on side 2 are scanned at the same time in the same pass.
Described below is the overview of the steps before document scanning and that of simplex and duplex
document scanning modes.
Setting a document
When a document is set on the document tray assembly and the lead edge is pushed into the tray until it stops,
the ADF document set actuator moves to place the sensor (ADF document set) in the unshielded (unblocked)
state. Then the machine recognizes that the document has been set properly, turning on the document set
LED.
Preparation for feed
Pressing the start button with the document set in the document tray will start feeding the document.
First the pick roll moves down and presses the document on the document tray to enable document feed.
The pick roll moves down with the normal rotation of the ADF feed drive motor assembly and it moves up with
the reverse rotation of the ADF feed drive motor assembly.
Upon completion of document feed, the pick roll returns to the normal (raised) position.
Cooling fan
Interface card
CCD carriage
Motor
Paper length sensor
H.P. sensor