Detecting The Level Of Paper - Canon CLC 1120 Service Manual

CHAPTER 7 PICK-UP / FEEDING SYSTEM
2. Detecting the Presence/Absence of Paper
The presence/absence of copy paper inside the cassette is detected by the cassette paper sensor.
Lifter position sensor

3. Detecting the Level of Paper

The copier uses the resistance occurring in the variable resistor operating in conjunction with
the movement of the lifter drive shaft to detect the level of copy paper inside the cassette. It
indicates the result in four levels (including absence of paper) on its control panel.
7-10
COPYRIGHT © 1999 CANON INC.
Pickup roller
Copy paper
Paper sensor
Open/closed
sensor
Figure 7-203
Paper level Indication on control panel
100% to
about 50%
About 50% to
about 10%
About 10% or
less
No paper
Figure 7-204
Feeding rollers
CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Separation roller
Lifter