Cassette Media-Presence Detection; Cassette Multiple-Feed Prevention; Figure 1-29 Cassette Lift Operation - HP LASERJET ENTERPRISE M725dn Troubleshooting Manual

Laserjet enterprise mfp m725
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When a print job is not sent for a specified period, the DC controller reverses the cassette lifter motor
until the cassette lift-up sensor stops sensing the lifter rack.
When the casette lift-up sensor keeps sensing the lifter rack for a specified period from when the lift-
down operation starts, the DC controller determines a cassette lifter motor failure and notifies the
formatter.
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 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 multiple sheets of paper from entering into the
product at one time. The cassette separation roller follows the rotation of the cassette pickup roller.
40
Chapter 1 Theory of operation
Cassette lift operation
Cassette lifter motor
M4
Cassette lift-up sensor
SR10
Lifter rack
M4
DC controller
Cassette media out sensor
Lifter
DC controller
Cassette pickup roller
SR7
Lifting plate
ENWW

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