Canon Paper Deck Unit-B1, Service Manual

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Chapter 2
2-4
F-2-6
2.2.2 Switching the Deck Paper Size
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Enter the appropriate paper size in service mode (OPTION>ACC>DK-P).
Move the guide plate inside the deck to suit the paper size, and enter the size in service mode (at time of installation or at the request of the user).
2.2.3 Detecting the Level of Paper
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The following sensors are used to detect the level of paper:
- deck paper supply position sensor (PS8D)
- deck paper level sensor (PS7D)
- deck paper absent sensor (PS2D)
The mechanism of detection can indicate an approximate level of paper inside the compartment on the host machine's control panel.
T-2-2
2.3 Deck Lifter
2.3.1 Detecting the Presence/Absence of Paper
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The deck's lifter detects the presence/absence of paper as follows:
T-2-3
1. Moving Up the Lifter
The compartment is pushed inside the deck.
The deck open detecting switch (SW1D) is pressed.
The deck open sensor (PS9D) detects the light-blocking plate.
- Stopping the Lifter
The deck lifter position sensor (PS4D) detects the top surface of the stack of paper to stop the lifter.
<preventing damage to the deck caused by excess ascent>
An upper limit is set, and it is detected using the deck lifter upper limit sensor (PS3D) in consideration of the following:
The sensor lever blocks the deck lifter position sensor for some reason (i.e., the lifter fails to stop its ascent).
2. Moving Down the Lifter
The deck open switch (SW100D) is pressed.
- Stopping the Lifter
The lifter stops where the lifter moves past the sensor lever of the deck paper supply position sensor (PS8D); i.e., at the falling edge of sensor output.
<addition of paper in this condition>
The added paper pushes the lever of the deck paper supply position sensor (PS8D).
The lifter moves farther down until the stack of paper moves past the sensor lever.
3. Adding Paper
Each time paper is added, the lifter repeats moving down until the deck lifter lower limit detecting switch (SW2D) is pressed (i.e., maximum paper supply level).
Paper level PS2D PS8D PS7D Indication on control panel
100% to about 50% 1 1 1
about 50% to about 10% 1 1 0
about 10% or less 1 0 0
no paper 0 0 0
operation: moved up or down by switching the direction of rotation of the deck lifter motor (M2D).
drive: obtained from the deck lifter motor (M2D) through cable and reel.
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