Cassette multiple-feed prevention
In the cassette, a separation roller prevents multiple sheets of paper from entering the paper path. The
cassette pickup roller drives the separation roller through a sheet of paper.
The rotation of the cassette feed roller through the sheet drives the cassette separation roller. Because it is
equipped with a torque limiter, only one sheet is fed into the product.
The low friction force between the sheets weakens the driving force from the cassette feed roller. Therefore,
the separation roller is driven by its own driving force and holds back any multiple-fed sheets from the
cassette.
Figure 1-38 Multiple-feed prevention
Cassette separation roller
follows the cassette feed roller
Driving force from
the pickup motor
Normal-feed
Multiple-feed
Print-media
Cassette pickup roller
Cassette separation roller
Cassette feed roller
Multipurpose tray pickup
The product picks up one sheet of paper from the multipurpose (MP) tray.
Following are the sequence of steps for the multipurpose tray pickup operation.
NOTE: Tray 1 and Tray 2 are optimal for paper pickup when using special paper or media other than 20lb
plain paper. For Tray 1 and Tray 2 the product increases the number of attempts to pickup a page, which
increases the reliability of successfully picking the page from the tray and decreases the possibility of a mis-
pick jam.
HP recommends using Tray 1 or Tray 2 if the product is experiencing excessive or reoccurring jams from trays
other than Tray 1 and Tray 2, or for print jobs that require media other than 20lb plain paper.
ENWW Pickup, feed, and delivery system 51
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