MX-M850 (serv.man16). Details of Each Section - E Tray Paper Feed Section - Sharp Copying Equipment Service Manual (repair manual). Page 6

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MX-M1100  TRAY PAPER FEED SECTION  E – 6
D. Remaining paper detection
(1) 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.
(2) 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.
E. Outline
The paper transport section serves the function of transferring
paper from each paper feed port to the registration roller section.
Paper from paper feed tray units 1 and 2, paper feed tray 3 and
paper feed tray 4 is transported vertically to the registration roller
section.
The detection of double-feed is done before transferring paper to
the registration roller, and the check of the off-center is carried out
by the image position sensor.
After the leading edge of the paper is synchronized with the leading
edge of the drum image in the registration roller section, the paper
that is transfer printed with the image in the transfer section passes
through the fusing section and is discharged either face-down or
face-up.
The no-paper detection sensor
detects the state of no remaining paper.
1/3 Field
Sensor logic: Low
2/3 Field
Sensor logic: Hi
3/3 Field
Sensor logic: Low
During no-paper detection
Remaining paper 1/3 position
Remaining paper 2/3 position
Remaining paper 1/3 position
Turn plate
MCPED
(paper sensor)
Remaining Paper
Detection Actuator
MCSPD
(remaining paper detection sensor)
(Figure showing state transition of the remaining paper detection sensor during tray elevation and
changes in status according to the number of remaining sheets)
Double feed
detection
Image position sensor
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