Ricoh D129 - Paper Height and End Detection

Paper Feed
D631 18 SM
2.2.3 PAPER HEIGHT AND END DETECTION
Paper Height
The amount of the paper in the tray is detected by combination of high (1)/low (0) outputs from
three sensors (paper height sensor 1 [A], 2 [B], 3 [D] and sub paper height sensor [C]).
Amount of paper PH S-1 PH S-2 PH S-3 Sub PH S
Indicator on the
operation panel
100% 0 0 0 0 Four lines
70%
0 0 1 -
Three lines
0 0 0 1
30% 0 1 - - Two lines
10% 1 - - - One line
End - - - - No line
0: No interruption (low), 1: Interruption (high), -: No checking
PH S: Paper Height Sensor
Paper End
The paper end sensor [E] monitors the light reflected by each sheet on top of the
stack.
When the last sheet feeds, the cutout [F] is exposed, and the paper end sensor receives no
reflected light from below because there is no paper. As a result, this signals paper end.