Paper Height Detection - Ricoh D158 Service Manual

2.5 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
Near End
30%
70%
100%
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.
SM
Paper Height Sensor 2
OFF
ON
ON
OFF
17
Paper Height Detection
ON
ON
OFF
OFF
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