Canon ImageCLASS MF4690 Service Manual - page 77

Chapter 7

7-1

7.1 Overview/Configuration

7.1.1 Overview

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The pickup/feeding system is the part to pickup and feed a paper, and it is composed of the main motor, solenoid, and various motors. 

In this machine, a paper is picked up from either the pickup tray or the manual feed tray, and it is delivered from the delivery tray. 

A paper set in either the pickup tray or the manual feed tray is picked up with the same pickup roller. Then, it is fed to the photosensitive drum, transfer charging

roller, fixing film, pressure roller, and face-down delivery roller, in that order, and is delivered to the delivery tray. 

On the feed path of a paper, the following 4 photointerrupters are allocated: the leading edge/paper width sensor (PS801, PS802), delivery sensor (PS803), and

delivery paper width sensor (PS804), and they detect either the arrival or passage of paper. 

If a paper does not arrive or pass each sensor, except the fixing paper width sensor, within the predetermined time, CPU on the DCNT board judges as a jam and

notify the occurrence of jam to the SCNT board. 

The diagrammatic illustration for each motor, solenoid, and sensor is shown below. 

F-7-1

[1] Face-down delivery roller 

[2] Pressure roller 

[3] Fixing film unit 

[4] Transfer charging roller 

[5] Photosensitive drum 

[6] Pickup roller 

[7] Separation pad 

[8] Manual feed tray 

[9] Pickup tray 

M1: Main motor 

SL1: Pickup solenoid 

PS801: Leading edge sensor 

PS802: Paper width sensor 

PS803: Delivery sensor 

PS804: Delivery paper width sensor 

7.2 Other Control

7.2.1 Overview

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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. 

SCNT

[1]

PS804

PS803

[3]

[2]

[4]

[5]

PS801

PS802

SL1

[6]

[7]

M1

[8]

[9]