Cassette Media-Presence Detection; Cassette Multiple-Feed Prevention; Figure 1-29 Cassette Lift Operation - HP LaserJet Enterprise 700 M712 series Handbuch Zur Fehlerbehebung

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
Before lift-up
After lift-up

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
Cassette lift operation
Cassette lifter motor
M1
Cassette lift-up sensor
SR10
Lifter rack
M1
DC controller
Cassette media out sensor
Lifter
DC controller
Cassette pickup roller
SR7
Lifting plate
Pickup, feed, and delivery system
37