Read Panasonic FA-S280 Service Manual online
2-6
Operation
2.3 Control Section
2.3.1
Enter Sensor and Exit Sensor
The Enter sensor and exit sensor are located on the paper insertion side (right
side) of the sorter. With no paper inserted, the light emitted from the LED of the
sensor reaches the phototransistor and the phototransistor turns ON. Therefore,
the outputs of both sensors are “L”.
When paper is fed from the copier, the enter sensor is activated. Then, the light
from the LED is blocked by the end of actuator so that the enter sensor output
becomes “H”. By monitoring this output signal, the CPU judges whether paper is
present or absent.
The exit sensor is used to detect a paper jam. The operation theory of the exit
sensor is the same as the enter sensor.
If paper remains over a predetermined period of time, the output of the exit sensor
is kept “H” so that the CPU judges that a paper jam has occurred.
SD001
VCC
RN2
CN5
Enter
Sensor
Sensor
Exit
Sensor
Sensor
RN4
RN2
RN4
PB4
PB5
ANODE
ENTER
GND
ANODE
JAM
GND
1
2
3
4
5
6
13
14
C12
C13
IC1 CPU
[CPU PCB]
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