Brother mfc8440 - Cassette Sensor; Paper Empty Sensor; Paper Eject Sensor

CHAPTER 3 THEORY OF OPERATION
3-18
2.4.3 Cassette sensor / Paper empty sensor
Detect if the paper tray is installed. They also detect if there is paper in the paper tray .
Fig. 3-27
2.4.4 Paper eject sensor
Detects if paper is ejected from the fixing unit.
Fig. 3-28
Paper empty sensor
Eject sensor PCB ASSY
Cassette sensor PCB ASSY
Cassette sensor
Fixing unit