250‑ and 550‑sheet tray paper path sensors
# Sensor Functions
1 Sensor (paper size) Detects the position of the paper guides
2 Sensor (paper present) Detects paper presence in the tray
3 Sensor (pick roller index) Detects the position of the pick roller
4 Sensor (pick) Detects paper as it is picked and fed to the printer
5 Sensor (pass‑through) Detects paper that is fed from the lower trays as it enters the printer
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Theory of operation
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