Konica Minolta bizhub 40p, Service Manual

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4. Operations Theory of operation V er. 1.0 Dec. 2007
6
PF-505
Composition/Operation
4.2 Actions of Main Functional Components
4.2.1 Overview
• The Option lower feeder unit is available as an optional feeder for bizhub 40P laser
printer. The Paper Cassette installed in the optical feeder is identical in function with the
standard Paper Cassette used by the base engine, and so the description of the Paper
Cassette is omitted here.
4.2.2 Media size switch
• A switch for setting the size of paper supplied from Paper Cassette is mounted. A signal
indicating the set size is transmitted as a voltage to the PRCB.
4.2.3 Actuator for empty sensor
• If paper runs out in the Paper Cassette, the Actuator for empty sensor drops and the flag
of the Actuator for empty sensor that shielded the detection portion of the Media empty
sensor moves off the detection portion. Thus, the light is transmitted.
4.2.4 Media empty sensor
• The presence or absence of paper in the Paper Cassette is detected by the position of
the Actuator for empty sensor. This is converted into an electrical signal. If the detection
portion is shielded (i.e., there is paper), /
N O PAPER FEED 550 S N R O N signal is turned
OFF.
4.2.5 Actuator for near empty sensor
• When paper is low in the Paper Cassette, the arm of the Actuator for near empty sensor
is pushed up by the media pressure plate. The flag of the Actuator for near empty sensor
that shielded the detection portion of the Media near empty sensor moves off the detec-
tion portion. Thus, the light is transmitted.
4.2.6 Media near empty sensor
• The state that paper is low in the Paper Cassette is detected by the position of the Actu-
ator for near empty sensor. This is converted into an electrical signal. If the detection por-
tion is shielded (i.e., paper is high), /LOW PAPER FEED 550 S
N R O N signal is turned
OFF.
4.2.7 Optional tray feed section
• This is a mechanism for supplying paper from the Paper Cassette into the printer. The
driving force from the Media feed motor is transmitted via the Media feed clutch to the
feed roller and pick-up roller. Thus, the paper is transported.
• When the pick-up roller picks up some sheets of paper and the paper gets low, the posi-
tion of the pick-up roller drops accordingly. The lowered pick-up roller pushes down the
lock lever of the media pressure plate, releasing it. The media pressure plate is pushed
up by a spring, and thus the paper is raised. The raised paper then raises the SUPPORT
N UDGER. The SUPPORT N UDGER disengages from the lock lever of the media pres-
sure plate. The media pressure plate stops moving upward.