2HJ/2HK
2-1-3
Paper gauge sensing circuit
The actuator which has a light reflector at one end keeps tracking of the height of the paper stack in the paper cassette.
The angle of the reflector varies according to the actuator angle which means the amount of paper remaining. As the
reflector moves across the detecting surface of paper gauge sensor (photo interrupter) 1 and 2, the on and off states of
these sensors vary in combination as shown in the table below, allowing to determine the amount of remaining paper in
the cassette.
Figure 2-1-4
Paper feed unit
Sensor PWB
Paper gauge
sensor 1 (PH702)
Paper gauge
sensor 2 (PH703)
Actuator
(Reflecting mirror)
PH702
PH703
1 to 1/3
1/3 to 2/3
2/3 to full
PH702
PH703
L
L
H
H
L
L
H
H
Paper
gauge
Empty
Actuator
position
Sensing input
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