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2BC/D
2-1-2
(1-1) Detecting the paper level
The mechanism of paper level detection is same for drawers 1 and 2, so only drawer 1 is explained here.
The drawer operating plate for making paper in the drawer come into contact with the forwarding pulley is activated by
raising the lift operating plate. The lift operating plate is attached on the lift shaft to which the upper lift motor (LM-U) is
connected. When the drawer is set to the copier or the lift limit switch 1 (LILSW1) is turned off as the paper on the lift is
used for copying, the upper lift motor (LM-U) will operate until the leading edge of the paper on the drawer operating
plate turns lift limit switch 1 (LILSW1) on. The tilting up angle of the lift operating plate (lift motor drive shaft angle) is
therefore small when the paper level is low, and large when the paper level is high. The upper lift motor (LM-U) includes
a circuit that converts the tilting up angle into 2-bit digital data by dividing the angle into four levels and outputs the data
as paper level detection signals (UPLESW1, UPLESW2). The engine PCB (EPCB) judges the amount of paper
remaining with four levels of full, 3/4, 1/2, and 1/4 based of the UPLESW1 and UPLESW2 signals and judges also
exhaustion of paper when paper switch 1 (PSW1) is not turned on even if the lift limit switch (LILSW1) is turned on. The
PCB, therefore, detects five levels of the amount of paper remaining in total.
57.17 to 80.0
°
41.35 to 57.17
°
28.54 to 41.35
°
0 to 28.54
°
H
L
L
H
L
L
H
H
1/4
1/2
3/4
Full
Lift motor upper drive
shaft angle
UPLESW2
UPLESW1
Amount of
paper
remaining
Paper level detection
output signal level
Drawer operating plate
Drawer 1
Paper switch 1
Lift limit switch 1
Lift operating plate
Lift shaft (lift motor upper drive shaft)
Figure 2-1-2
Paper level detection
EPCB
CN17-8
CN17-6
CN17-10
CN17-5
CN7-9
CN7-6
CN7-25
CN7-22
CN17-1
CN17-3
UPLESW1
UPLESW2
LM-U REM
UPLESW1
UPLESW2
LM-L REM
LM-U
PSW1
PSW2
LILSW1
PSW1
PSW2
LILSW1
LILSW2
LM-L
LILSW2
Figure 2-1-3
Paper level detection section block diagram
Содержание KM-4530
Страница 1: ...SERVICE MANUAL Published in Apr 02 2BC70761 Revision 1 KM 4530 5530...
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