Ricoh BR-C1a Basic Service Training page 186

 When the height of the stack becomes low, the bottom plate
position sensor [D] turns OFF. Then the bottom plate lift motor
[A] turns ON again to lift the original to the correct position for
feeding.
 After the last original is fed, the bottom plate descends as far as
the bottom plate HP sensor [C], and the motor turns off.
Slide 186
No additional notes
Bottom Plate - 2
186
BR-C1 Training