Controlling Charging; Controlling Pre-Exposure Led; Outline - Canon iR5000 Service Manual

CHAPTER 4 IMAGE FORMATION SYSTEM

3. Controlling Charging

3.1 Controlling Pre-Exposure LED

3.1.1 Outline

The machine is equipped with a pre-exposure LED array to prevent adhesion of excess
toner to the photosensitive drum because of residual charge, and its system of control serves
the following functions:
1. Turning On/Off the Pre-Exposure LED Array
The system uses the following signals:
[1] pre-exposure LED control signal: when '0', LED turns on.
4-18 P
J103A
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2
24V
3
PEXP* [1]
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F04-301-01
COPYRIGHT © 2000 CANON INC.
Pre-exposure lamp
2000 2000 2000 2000 CANON iR5000/iR6000 REV.0 JULY 2000