Printing From Paper Feeder Cassettes - Mita DP-2800 Service Manual

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Printing from paper feeder cassettes

At the moment the logic controller finishes data processing, the logic controller passes
PRINTN signal to the engine controller. The engine controller then activates the clutch for
the feed roller of the currently selected cassette (in the paper feeder) and the sub clutch in
the printer to start feeding paper. As the paper kicks the registration jam sensor, it
momentarily stops there before the print data starts laser scanning on the drum.
Pick-up roller
One-way clutch
Sensor 1
Feed roller
Solenoid
Paper
Sensor 2
Bottom plate
Arm
Retard roller
Torque limiter
When the laser scanner and the fuser are ready, the engine controller sends VSREQN
signal to the logic controller to verify the readiness of data. When the logic controller finishes
data processing, it sends VSYNCN and VDATA to the engine controller. Now the paper is
released from the registration rollers and through under the drum unit, starting the image
development, transferring, and fusing. The paper having passed through the fuser unit kicks
the face-down or face-up paper jam sensor (and the paper-full sensor at the face-down
outlet, if the paper was destined to the face-down stack). When the paper is not detected
by these sensors in the expected time of period, depending on the current paper size, the
engine controller halts printing and report the occurrence of a paper jam.
The size of the paper currently in the selected cassette is acknowledged to the engine
controller by means of the on-off status of the photosensors PT1, PT2, and PT3 in the paper
feeder, at the end of the paper cassette. The table below summarizes the on-off status of
these photosensors in accordance with the supported paper sizes.
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