Kyocera Mita FS-6750, Руководство по обслуживанию, Страница: 81 / 161

Operation theory
Paper feeding system
4-23
FS-6750
Paper jam sensing
The registration sensor and the exit (fuser) sensor keep track of the paper sent
through the printer’s paper path by watching the time of period during which
either sensor is kept activated.
Registration sensor
—A photo reflector sensor is used. While the paper is not present
(1), the reflector (shiny mirror surface) at the end of the actuator is in the position
that can reflect the light to shine the receptor. As the top edge of the paper reaches
the registration sensor, the reflector is pushed up and the light is interrupted (2),
triggering the sensor.
Pickup of paper in the cassette is triggerred by the FEDDR* signal which drives
the clutch for the feed roller.
Exit sensor
—This is a photo penetration sensor, combined with an actuator arm ex-
tending to the fuser board. The actuator is in the way back at the fuser outlet. The
re-flector at one end of the actuator is normally seated in-between the photo trans-
mitter and sensor (1). It is dressed away out of them when the paper in the fuser
sensor pushed up the actuator (2), allowing the light to hit the receptor and turning
the sensor circuit on.
On detecting a paper jam, the engine controller stops printing action and shows the
Paper jam message. After removing paper jam, the printer resumes printing when
either the toner access door or the feed assembly is once opened and closed. If paper
jammed past the exit sensor, the printer will not attempt to print the same page.
The printer reverts to normal operation when the top cover or the paper feed unit is
once opened and closed after removal of jam. If the paper was jammed clearing the
eject sensor, the printer does not print the same page when recovered.
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