Ricoh FT5535 Service Manual page 673

BASIC OPERATION
3.4 BIN HOME POSITION
[A]
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The bin home position sensor [A] ensures that the proof tray is lower than the
transport roller when the bins are in the home position.
When the main switch is turned on, the sorter stapler initializes itself to check
whether the component parts work or not. At this time, the bin drive motor
raises the bins for a few moments, then it lowers the bins until the bottom bin
actuates the bin home position sensor.
SM 4-9 A207/A208/A211