The DC controller reverses the cassette lifter motor until the cassette lift-up sensor stops sensing the lifter rack when a print job is not sent for a specified period. The DC controller determines a cassette lifter motor failure and notifies the formatter when the cassette lift-up sensor keeps sensing the lifter rack for a specified period from when the lift-down operation starts. The following figure shows the mechanism of the cassette lift operation for the upper cassette. Both upper and lower cassettes have the same mechanism.
Figure 1-29 Cassette lift operation Before lift-up DC controller Cassette lifter motor M1 Cassette media out sensor Cassette pickup roller Cassette lift-up sensor SR10 SR7 Lifter rack Lifter Lifting plate After lift-up DC controller M1 Cassette media-presence detection The DC controller detects whether the paper is loaded in the cassette by monitoring the cassette media out sensor. The cassette media-presence detection is not performed during Sleep mode. The DC controller determines a media-absence and notifies the formatter when the cassette media out sensor does not detect the paper.
Cassette multiple-feed prevention The product uses a cassette separation roller to prevent the multiple sheets of paper from entering to the product. The cassette separation roller follows the rotation of the cassette pickup roller. When multiple ENWW Pickup, feed, and delivery system 37