Detecting The Paper Level - Kyocera Mita KM-4530 Service Manual

2BC/D

(2-4) Detecting the paper level

* The mechanism of paper level detection is same for drawers 3 and 4, so only drawer 3 is explained here.
When the drawer is pulled out from the copier and then pushed in again or when paper on the lift is used for copying, the
deck right lift motor (DLM-R) drives until the leading edge of the paper on the lift turns deck lift limit switch 1 (DLILSW1)
on. The rising level of the lift, therefore, depends on the amount of paper remaining. When the amount of paper
remaining is large, the level is low, and when small, the level is high. At the rear portion of the deck, deck right paper
level switches 1, 2, and 3 (DLPSW1-R, DLPSW2-R, DLPSW3-R) are mounted at three levels and turn on or off based on
the shielding plate mounted to the lift. The engine PCB (EPCB) detects the level below which the actuator turns the
switches on (or no switch on) when the deck right lift motor (DLM-R) rises and judges the rising level of the lift (paper
level) with four levels. The PCB judges also exhaustion of paper when deck paper switch 1 (DPSW1) is not turned on
even if deck lift limit switch 1 (DLILSW1) is turned on. The PCB, therefore, detects five levels of paper remaining in total.
Lift
2-1-12
Actuator
Deck lift limit switch 1
Figure 2-1-11 Detecting the paper level
CN8-16
CN20-22
CN20-25
CN20-28
CN26-6
DLILSW2
DPLSW1-L
DPLSW2-L
DPLSW3-L
DLM-L
Figure 2-1-12 Paper level detection system block diagram
Deck right paper level switch 1
Deck right paper level switch 2
Deck right paper level switch 3
Deck paper switch 1
CN8-18
CN20-31
EPCB
CN20-34
CN20-37
CN8-2
DLILSW1
DPLSW1-R
DPLSW2-R
DPLSW3-R
DLM-R
Deck right lift motor