D. Detecting the Level of Copy Paper
The machine checks the level of copy paper inside the cassette and indicates the level in four degrees.
The level of copy paper inside the cassette is checked in reference to the up movement of the lifter noted
when the light-blocking plate blocks the appropriate sensor.
When copy paper starts to run out, the lifter rises gradually;when paper fully runs out, the cassette
paper sensor (Q1604 for upper) detects the absence of paper.
Figure 3-620
Full of copy paper
Out of cop paper
Lifter
condition
Gear an
level sensor
Figure 3-621 Detecting the Level of Paper inside the Cassette (upper)
Lifter
Light-blocking plate
3–93
COPYRIGHT © 1996 CANON INC. CANON GP215/200 REV.0 JULY 1996 PRINTED IN JAPAN (IMPRIME AU JAPON)
3. OPERATIONS AND TIMING
Pick-up roller
Copy paper
Lifter
Pick-up roller
Copy paper
Lifter
Q1606
Q1607
(upper cassette)
Light blocking
plate
Gear when the cassette is full of
copy paper