Cassette Pick-Up Unit; Lifter Operation (Cassette 3/4); Detecting The Presence/Absence Of Paper - Canon iR6570 series Service Manual

Chapter 8

8.4 Cassette Pick-Up Unit

8.4.1 Lifter Operation (cassette 3/4)

When the cassette is pushed into the machine, the cassette open/closed sensor goes on and, at the same time, the pickup roller starts to move down. At this
time, the light-blocking plate leaves the lifter sensor, causing the cassette lifter motor to go on and the lifter to move up. When the lifter moves up and the
lifter sensor detects the surface of paper, its ascent stops.
When the open button of the cassette is pressed, the drive gear of the lifter becomes disengaged, letting the lifter to move down under its own weight.
Cassette opening/
closing
Detection
Lifter position
detection
Paper detection
Paper level detection cassette 3 paper level detection
Lifter ascent limiter
drive motor
The following diagram shows the components of the cassette pickup unit:

8.4.2 Detecting the Presence/Absence of Paper

The presence/absence of paper inside the deck or the cassette is checked by the cassette paper sensor.
- Paper Present
8-14
Cassette 3
cassette 3 opening/closing
sensor (PS15)
cassette 3 lifter sensor (PS17) cassette 4 lifter sensor (PS18)
cassette 3 paper sensor (PS13) cassette 4 paper sensor(PS14)
PCB
(variable resistor)
---
cassette 3 lifter motor (M20)
Pickup roller
Paper
Lifter sensor
Paper sensor
Cassette open/closed
sensor
T-8-10
Cassette 4
cassette 4 opening/closing
sensor (PS16)
cassette 4 paper level detection
PCB
(variable resistor)
---
cassette 4 lifter motor(M21)
Retry sensor
Feed roller
Separation roller
Pickup roller
Lifter
F-8-13
0009-3164
0009-3167