ADF operation
The ADF will not function when the ADF cover is open. The paper path is incomplete if the ADF cover is lifted
from the glass.
When the product duplexes from the ADF, the paper moves through one time, because the ADF has a CIS
scanner for side two which is scanned simultaneously with side one.
The standard operation of the ADF consists of the standby (paper loading) mode, pick, feed, and lift steps:
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Standby (paper-loading) mode
In standby mode, the lift plate is in the down position. When a document is loaded into the input tray,
the paper-present sensor detects its presence.
When a copy/scan is initiated, the ADF motor engages the gear train and raises the lift plate until the
document makes contact with the pick roller. The ADF then begins the pick, feed, and lower sequence:
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Pick
The pick roller rotates and moves one or more sheets forward into the ADF where the sheets engage
with the separation roller. The separation roller contacts the ADF separation pad, which separates
multiple sheets into a single sheet.
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Feed
The single sheet continues through the ADF paper path (aided by the pre-scan rollers) until the leading
edge of the page activates the top-of-form sensor. Activation of this sensor initiates the scan process,
and the scanner acquires the image as the document moves over the ADF glass. The post-scan rollers
then eject the sheet into the output area. The pick and feed steps are repeated as long as paper is
detected by the paper-present sensor.
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Home
When the form sensor detects the trailing edge of the last page, the last sheet is ejected and the motor
turns on a sequence that rests the separation floor back down in standby mode, which allows it to
detect when more media is loaded.
Note that the ADF will not function when the ADF door is open.
ADF duplex operation
The ADF on this product is equipped with a duplex image scanner to facilitate fast and efficient duplex copies
and scans.
When a duplex copy/scan is initiated, the duplex image scanner acquires the image from the back side of the
document while the flatbed image scanner simultaneously acquires the image from the front side of the
document.
ADF paper path and ADF sensors
The paper-present sensor determines if paper is in the ADF. The form sensor detects the top and bottom
edges of the document. One other sensor detects an open ADF door.
30 Chapter 1 Theory of operation ENWW
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