Canon iR5000i Service Manual page 495

1.4 Deck Lifter
1.4.1 Detecting the Presence/Absence of Paper
The lifter of the deck is connected to a reel by means of a cable, and is driven by the drive
of the deck lifter motor (M102). The lifter is moved up or down by changing the direction of
motor rotation.
When the compartment is slid into the deck, the deck OPEN detecting switch is pushed;
then, the lifter moves up as soon as the deck OPEN sensor (PS109) detects the light-block-
ing plate. The deck keeps moving up, and stops when the deck lifter position sensor
(PS104) detects the top surface of the stack of paper on the lifter.
If the lifter fails to stop moving up after the sensor lever blocks the deck lifter position
sensor for some reason, the deck lifter upper limit sensor (PS103) will turn on to prevent
damage otherwise caused by the deck.
The lifter, on the other hand, starts to move down when the deck open switch (SW100) is
pushed; it continues to move down unit it moves past the sensor lever of the deck paper sup-
ply position sensor (PS107), i.e., the falling edge of the sensor output.
When paper is supplied in this condition, it will push down the lever of the deck paper
supply position sensor, and the lifter in response will move farther down until the stack of
paper moves past the sensor lever.
The lifter repeats the descent each time paper is supplied until the deck lifter lower limit
detecting switch (SW102) is pushed.
COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON iR5000i/iR6000i REV.0 JUNE 2001
CHAPTER 8 PAPER DECK
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