Ricoh B205 Service Manual page 425

When the tray contains paper of a small width, the paper feed pressure may
become too low when the thickness of the remaining stack of paper has
decreased. The lift motor rotates forward 400 ms after the sensor detects a certain
amount of paper remaining in the tray to increase paper feed pressure, simulating
the pressure generated by a full tray.
NOTE: The relationship between the bottom plate re-adjustment timing, paper size
threshold, and the related SP modes is explained in "Bottom Plate
Pressure Adjustment for Paper Size".
SM 6-65
PAPER FEED
B205/B209/D007/D008