Ricoh LD013, Service Manual

Page: 333 / 513

PAPER HEIGHT DETECTION
B384 9-8 SM
2.4 PAPER HEIGHT DETECTION
The amount of paper in the tray is detected by the combination of on/off signals
from two paper height sensors [A] and [B].
When the amount of paper decreases, the bottom plate pressure lever [C] moves
the actuator up.
The following combination of sensor signals is sent to the copier/printer.
Amount of Paper Paper Height Sensor 1 Paper Height Sensor 2
Near End OFF ON
30% ON ON
70% ON OFF
100% OFF OFF
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 300 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.
B384D107.WMF
[C]
[C]
[B]
[A]