Preliminary Operation Before Paper Feed; Paper Feed Operation; Remaining Paper Detection; Remaining Paper Detection Method - Sharp MX-2300 G Service Manual

2. Operational descriptions

A. Preliminary operation before paper feed
• When the paper is set and the paper feed tray is inserted, the
pickup roller moves down and the paper feed tray sensor turns
ON.
• The lift-up motor operates to lift the rotating plate.
• The paper upper limit sensor turns on to stop the rotating plate at
the specified position.
B. Paper feed operation
• When copy/print operation is started, the motor and the clutch
are turned ON and the pickup roller is rotated in the paper pickup
timing to feed paper.
• At the same time, the paper feed roller rotates to feed paper to
the transport section. At that time, the separation roller rotates to
prevent against double feed of paper.
C. Remaining paper detection
• Remaining paper detection is performed according to four
stages, i.e. three stages with paper and one stage with no paper,
and the result is displayed.
D. Remaining paper detection method
• The number of remaining sheets is determined according to the
number of times the remaining paper sensor changes from the
time the paper feed tray starts lifting up to the time when the
upper detection sensor comes ON.
(Figure showing state transition of the remaining paper detection sensor during tray elevation and
1/3 Field
Sensor logic: Low
2/3 Field
Sensor logic: Hi
3/3 Field
Sensor logic: Low
changes in status according to the number of remaining sheets)
The no-paper detection sensor detects
the state of no remaining paper.
During no-paper detection
CSPD

(remaining paper detection)

Remaining paper 1/3 position
Remaining paper 2/3 position
Remaining paper 1/3 position
MX-2300/2700 N/G TRAY PAPER FEED SECTION E – 3
CPED
(paper sensor)
Remaining Paper
Detection Actuator
Turn plate