Canon iR2200 Series, Service Manual

Page: 195 / 768

COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001
CHAPTER 4 IMAGE FORMATION SYSTEM
4-15 P
4.2 Turning On/Off the Bias
The separation static eliminator bias is turned on/off as follows:
[1] When the static eliminator bias enable signal from the DC controller PCB goes ‘0’, the
static eliminator bias output ON signal is generated.
[2] A DC bias is sent to the separation static eliminator.
4.3 Controlling the Bias to a Specific Voltage Level
The bias output is fed back to the output control circuit, thereby ensuring a specific level
of voltage.
4.4 Controlling the Output by Paper Type and Environment
Sensor (humidity)
In a low-humidity environment, separation can fail when thin paper is used or when the
second side of a double-sided sheet is hadled. To ensure good separation, the voltage ap-
plied is increased between -2.3 and -3.0 KV with reference to the type of paper and the
reading of the environment sensor (humidity).
The selection of an application voltage is done in response to the static eliminator bias
mode signal (serial communication) from the DC controller PCB.