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©
2001 CANON INC. 2000 2000 2000 2000 CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001
CHAPTER 4 IMAGE FORMATION SYSTEM

4-9 P

3 Controlling the Transfer Charging Roller Bias
3.1 Outline

Part 2>Chapter 5>7.8.3 “Controlling the Transfer Roller Charging”

The machine’s transfer charging is a direct charging method that uses a transfer charging

roller. A DC bias is applied to the transfer charging roller.

The following relate to the transfer charging system:

[1] Turning on/off the bias.

[2] Controlling the DC bias to a specific voltage/current level.

[3] Controlling the detection of transfer charging roller resistance (ATVC control)

[4] Controlling the output by operation mode

[5] Controlling the output by the environment sensor (humidity)

F04-301-01

DC controller PCB
Transfer
charging
output enable
signal Cleaning
bias out
Cleaning bias output
ON signal
Transfer output
mode signal 4
Transfer bias output
ON signal
Transfer bias
output control
signal
J301
-B9 J136
-B4
J135
-B8 -B5
J301
-A3
-A1
J136
-A10
-A12
24 VDC input from
main power supply

Composite power supply PCB

PW-CPU
Transformer drive
signal
T133
-B5 -B8
-B6 -B7
-B7 -B6
Transformer drive
signal
Photosensitive
drum
Transfer bias
high-voltage
transformer
(T133)
Transfer cleaning
bias high-voltage
transformer
(T506)
Transfer
bias
output
Transfer
charging roller
Voltage
detection
Voltage level
(ATVC measurement result)
+24V
Environment
sensor
(humidity)
Measurement resultJ302-B14
Serial
communication
Print/standby mode signal
Transfer bias output data
ATVC measurement data
Drive
control Current
detection
Current
level
Transfer output
mode signal 3
Transfer output
mode signal 2
Transfer output
mode signal 1
Transfer bias output
current switching signal