Paper Feed Control; Remaining Paper Detection Control - Konica Minolta 7145 Service Manual

PAPER FEED UNIT
6.2.2

Paper feed control

The following shows the timing of paper feed by the tray 1. The timing of paper feed is basically the same
for both the tray 2 and the bypass tray, and the actual paper feed in each case starts when the SD2 (1st
paper feed solenoid/L) or the SD3 (Bypass solenoid) turns on respectively.
M9 (Paper feed motor)
SD1 (1st paper feed solenoid/U)
PS21 (Timing sensor/U)
MC2 (Loop clutch)
PS1 (Registration sensor)
[1] START button (ON)
6.2.3

Remaining paper detection control

Since the operation is the same for both the tray 1 and the tray 2, the explanation is given of the tray 1
only.
The remaining paper quantity is detected by the PS9 (Tray set sensor/U). As the remaining paper is get-
ting reduced, the actuator provided on the rear side of the tray starts to ratate gradually as shown in the
drawing. The PS9 turns on and off each time it passes through a slit. The remaining paper quantity is
detected by counting the number of ON/OFF's after the installation of the tray.
0 count: Full 1 count: Medium 2 counts: Low
[1] Rotating direction when the paper up/down
plate is going up.
[2] PS9 (Tray set sensor/U)
[1]
[3]
[4]
[5]
2-22
[1]
[2]
[3]
[4]
[5]
Slit 1
Slit 2
Actuator