Specifications

C-9
PagePro25
2-2-2. Sensors for Tray 2
(1) 2nd Cassette Set Switch (SW3)
This switch detects whether the 2nd paper cassette is installed in the tray 2 or not. This switch also detects the paper cas-
sette type; 250 sheet universal cassette or 500 sheet fixed cassette.
If no paper cassette is installed on the tray 2, the switch is not pressed by the paper cassette.
When the 250 sheet universal cassette is installed, the left side of the switch is pressed by the projection of the cassette.
While the 500 sheet fixed cassette is installed, the right side switch is pressed by the projection of the cassette.
(2) 2nd Cassette Paper Empty Sensor (PC22)
This sensor detects the paper empty status of the 2nd paper cassette. The sensor uses a photointerrupter. When paper
runs out in the 2nd paper cassette, paper empty occurs.
When paper is present in the paper cassette, the sensor arm is pressed by the paper and it is lifted. So, the projection of
the sensor arm engages with the photointerrupter. Thus, the light from the LED of the photointerrupter is blocked and the
photointerrupter turns OFF. As a result, the output of the photointerrupter is “H”.
When paper runs out in the paper cassette, the sensor arm lowers by pressing a spring so that the projection of the sen-
sor arm comes off the photointerrupter. Thus, the light from the LED passes in the photointerrupter and the photointer-
rupter turns ON. As a result, the output of the photointerrupter is “L”.
(3) 2nd Cassette Paper Near Empty Sensor (PC25)
This sensor detects the paper near empty status of the 2nd cassette paper. The sensor uses a photointerrupter. As the
sheets of paper in the paper cassette decrease, the paper lifting plate in the paper cassette lifts. When the paper lifting
plate lifts exceeding a certain point, the 2nd cassette paper near empty occurs.
When enough paper is present in the paper cassette, the paper lifting plate is lowered. In this condition, the projection of
the sensor arm is engaged with the photointerrupter. Thus, the light from the LED of the photointerrupter is blocked by the
projection and the photointerrupter turns OFF. As a result, the output of the photointerrupter is “H”. When the remainder
of paper decreases, the lower part of the sensor arm is pressed by the paper lifting plate and the projection of the sensor
arm comes off the photointerrupter. Thus, the light from the LED passes in the photointerrupter and the photointerrupter
turns ON. As a result, the output of the photointerrupter is “L”.
2nd Cassette Set Switch (SW3)
Fixed Cassette
Mounted on
the printer.
Universal Cassette
Output=L/H (TBD)
2nd Cassette Paper Empty Sensor (PC22)
Light passes:
Output = L
Paper
Light is blocked:
Output = H
[Paper is present.]
[Paper empty]