Canon imagePROGRAF iPF815 Service Manual page 127

Pinch roller pressure detection sensor
The photointerrupter-type pinch roller pressure detection sensor detects the pressurization of the pinch roller if the pinch roller pressure cam rotates to
shield the sensor light.
Pinch roller release detection sensor
The photointerrupter-type pinch roller release detection sensor detects the depressurization of the pinch roller if the pinch roller pressure cam rotates to
shield the sensor light.
Cutter HP sensor
The photointerrupter-type sensor detects the presence of the cutter at the home (rightmost) position.
Cutter left position sensor
The photointerrupter-type sensor detects the presence of the cutter at the leftmost position.