Setting A Document; Preparation For Feed; Prefeed; Scan Control - Dell 2135cn Service Manual

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9.2.1 Setting a Document

When a document is set in the document tray and pushed into the tray until its lead edge stops, an

actuator moves to place the ADF document sensor in the unshielded (unblocked) state, indicating

detection of the document.

Pressing the Start button with the document set in the tray starts feeding of the document.

First, the Nudger Roll moves down and presses onto the document in the document tray to enable

document feed. The Nudger Roll moves down with normal rotation of the ADF Motor. Upon completion

of document feed, the ADF Motor reverses rotation to return the Nudger Roll to its normal position.

In the prefeed step, a document sheet is fed from the Feed Roll to the Takeaway Roll.

When the Nudger Roll is pressed down to the document sheet surface, (see "9.2.2 Preparation for

Feed"), the ADF Motor rotates to drive the Nudger Roll and Feed Roll. The Nudger Roll feeds the top

document sheet in the document tray to the Feed Roll. The Feed Roll, nipped by the ADF Separator

Pad, feeds document sheets (coming from the Nudger Roll) one by one. When the Feed Sensor

detects a document sheet, the machine recognizes that feed of the first document sheet is complete.

Scanning of the image illuminated with the Exposure Lamp of the Scanner ASSY is controlled by

changing the feed speed according to the copy magnification.

When the document sheet passes the CVT position at the specified speed, the images on the

document sheet are exposed by scanning with the Exposure Lamp of the Scanner ASSY, and read by

the CCD Image Sensor.

Version 1 2008.02.01

Chapter 6 Principle of Operation (Scanner)

Takeaway Roll

ADF Separator Pad

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