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Duplexer reverse-and feed-operation sequence
The operational sequence of the reverse-and-feed operation is as follows:
1.
The paper printed on the first side passes through the fuser.
2.
The DC controller feeds the paper until the trailing edge of paper reaches the reverse position,
after the fuser output sensor detects the trailing edge.
3.
The duplex controller reverses the output roller and the intermediate output roller to feed the paper
to the duplexer from the reverse position.
4.
The duplex controller detects the image starting position according to the side misregistration
sensor and feeds the paper to the re-pickup waiting position.
5.
The duplex controller stops the paper temporarily at the re-pickup waiting position when the paper
is standard size, but shorter than Letter-R. It feeds the paper to the product engine again if a print
command is sent from the formatter. If a print command is sent before the paper reaches the re-
pickup 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 and paired at the
position of right edge of each standard size paper. The side misregistration sensor reciprocates while
lighting the LED which corresponds 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 the 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 the LED light.
Then, the side misregistration amount is calculated by subtracting the distance of nominal position
(without side misregistration) for each paper size. The side misregistration amount is sent to the
ENWW
Duplexer
89
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Troubleshooting
