HOME PAGE | < Previous | Contents | Next >
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.
Paper Feed
SM
19
D631
D631
D631
19
19
SM
SM
Paper Feed
Paper Feed
RT3020 - 1200-SHEET LCT
(D631)
RT3020 - 1200-SHEET LCT
(D631)
RT3020 - 1200-SHEET LCT
(D631)