Side Misregistration Detection - HP LaserJet Enterprise 700 M712 series Handbuch Zur Fehlerbehebung

command is sent from the formatter. If a print command is sent before the paper reaches the
repickup waiting position, the duplex controller does not stop the paper.
If the paper is other than standard size or standard size but longer than Letter-R and a print
command is sent before the paper reaches the re-pickup waiting position, the duplex controller
does not stop the paper. If a print command is not sent before the paper reaches the re-pickup
waiting position, the duplex controller notifies the formatter of duplex re-pickup jam 3 through the
DC controller.

Side misregistration detection

The side misregistration detection is a feature to determine the starting position in scanning direction for
the second side printing of the paper fed to the duplexer.
The LED and photoreceiver sensor of the side misregistration sensor are located paired at the position
of right edge of each standard size paper. The side misregistration sensor reciprocates while lighting
the LED which is corresponding to the paper size. The paper passes through in between the LED and
photoreceiver sensor.
The side misregistration detection is performed when the duplex re-pickup sensor detects the leading
edge of paper. The moving distance of the sensor is measured according to the home-position of the
side misregistration sensor and the position where the right edge of paper interrupts LED light. Then the
side misregistration amount is calculated by subtracting the distance of nominal position (without side
80 Chapter 1 Theory of operation ENWW