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
Cassette lift operation
M4
M4
DC controller
Cassette lifter motor
Cassette pickup roller
SR10
SR7
Before lift-up
Lifter rack
Lifter
Lifting plate
Cassette lift-up sensor
Cassette media out sensor
After lift-up
DC controller
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
ENWW
Summary of Contents for LASERJET ENTERPRISE MFP M725dn
Page 1: ...LASERJET ENTERPRISE MFP M725 Troubleshooting Manual M725z M725dn M725f M725z ...
Page 2: ......
Page 3: ...HP LaserJet Enterprise MFP M725 Troubleshooting Manual ...
Page 6: ...iv Conventions used in this guide ENWW ...
Page 32: ...xxx ENWW ...
Page 142: ...110 Chapter 1 Theory of operation ENWW ...
Page 457: ...4 Close the fuser jam access cover 5 Close the fuser door ENWW Clear jams 425 ...
Page 475: ...1 Lift the document feeder latch 2 Open the document feeder cover ENWW Clean the product 443 ...
Page 516: ...484 Appendix A Service and support ENWW ...
Page 545: ......
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