MX-DE21. Service Manual. - Sharp Copying Equipment Service Manual (repair manual). Page 15

MX-DE21  OPERATIONAL DESCRIPTIONS  4 – 2

The paper empty detector (D1PED and D2PED) checks whether there is paper in the tray when the tray is lifted and stopped at a position
where it can feed paper, as well as during paper feed operation. 

When the upper limit detector is ON and the tray is lifted up, 

The amount of the remaining paper in the tray is 0% (no paper) when the paper level detector detects the empty of the paper.

  

The amount of the remaining paper is determined in three stages by changing the paper level detector position as the following table and figure
shown until the upper limit detector is ON after the tray is inserted and lifted up when the paper level detector detects the paper.  

Left Tray
Tray 3)

Right Tray
Tray 4)

0%

0%

Paper empty detector ON (No paper)

6%

9%

Paper level detector -> Transparent -> Light block -> Transparent

Refer to Figure 1

33%

50%

Paper level detector -> Transparent -> Light block

Refer to Figure 2

100%

100%

Paper level detector -> Transparent

Refer to Figure 3

Lift up

Lift up

Lift up

Lift up is stopped

Lift up is stopped

Paper empty detector
(D1PED, D2PED)

Paper empty detector
(D1PED, D2PED)

Paper empty detector
(D1PED, D2PED)

Paper level detector
(D1PQD, D2PQD)
(Transparent) Low

<Figure 1>

<Figure 2>

<Figure 3>

Paper level detector
(D1PQD, D2PQD)
(Transparent) Low

Paper level detector
(D1PQD, D2PQD)
(Transparent) Low

Paper level detector
(D1PQD, D2PQD)
(Transparent) Low

Paper level detector
(D1PQD, D2PQD)
(Light block) Low

Paper level detector
(D1PQD, D2PQD)
(Light block) Low

Upper limit detector
(D1LUD, D2LUD)

Upper limit detector
(D1LUD, D2LUD)

Upper limit detector
(D1LUD, D2LUD)