Other Control; Overview - Canon i-SENSYS MF4300dn Service Manual

Chapter 7

7.2 Other Control

7.2.1 Overview

i-SENSYS MF4300dn / i-SENSYS MF4350d / i-SENSYS MF4380dn / i-SENSYS MF4310/4318 / i-SENSYS MF4320d / i-SENSYS MF4330d / i-SENSYS
MF4340d / i-SENSYS D450d / i-SENSYS MF4370dn
Pickup/Feed Operation
The pickup/feed assembly is the mechanism to pickup and feed paper one at a time from the pickup tray or the manual feed tray.
The pickup/feed operation of the machine is explained below.
1) Right after the DCONT PCB receives a print command from the SCNT PCB, it rotates the main motor (M1). By doing so, other rollers, except the Cassette
pickup solenoid, start to rotate.
2) When it becomes initial rotation ready state, the pickup solenoid (SL1) turns ON for about 0.2 sec. As a result of that, the rotation of the main motor is transferred
and the pickup roller starts to rotate.
Initial Rotation Ready
It indicates the following state: the main motor drives, and after a certain period of time, the temperature of the fixing assembly reaches to the specified value and
the scanner motor reaches to the specified number of rotation.
3) The pickup cam rotates along with the rotation of the pickup roller, and by following the shape of the pickup cam, the lifting plate is pushed up with the force
of the spring. A paper pushed up with the lifting plate is picked up by the rotation of the pickup roller and fed to inside of the machine.
4) After a certain period of time that the leading edge sensor (PS801) detects the leading edge of picked up paper, the DCNT PCB transmits the laser beam detection
signal (/BD) to the SCNT PCB.
5) Based on the /BD signal, the SCNT PCB transmits the video signal to the laser/scanner assembly and an image is formed on the photosensitive drum. Because
of that, it is controlled to match the leading edges of an image and a paper.
6) A paper is delivered to the delivery tray with the rotation of the photosensitive drum, pressure roller, and face-down delivery roller.
SCNT
[2]
[4]
[1] Face-down delivery roller
[2] Pressure roller
[3] Fixing film unit
[4] Transfer charging roller
[5] Photosensitive drum
[6] Pickup roller
7-2
[1]
PS804
PS803
[3]
[5]
PS801
PS802
[6]
SL1
[7]
M1
[8]
F-7-2
[9]
0020-2697