Controlling The Transfer Charging Roller Bias; Outline - Canon iR2200 Service Manual

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)
24 VDC input from
main power supply
Transfer
charging
J301
output enable
-B9 signal
Transfer output
mode signal 4
-B8
Serial
communication
Print/standby mode signal
Transfer bias output data
ATVC measurement data
J301
-A3
-A1
Transfer output
mode signal 1
-B5
Transfer output
mode signal 2
-B6
Transfer output
mode signal 3
-B7
J302-B14
COPYRIGHT © 2001 CANON INC.
Composite power supply PCB
+24V
J135
Transformer drive
J136
signal
-B4
Cleaning bias output
ON signal
-B5
Voltage level
(ATVC measurement result)
Transformer drive
signal
J136
Transfer bias output
-A10
ON signal
-A12
-B8
Transfer bias
output control
signal
-B7
Transfer bias output
current switching signal
-B6
Measurement result
F04-301-01
2000 2000 2000 2000
CHAPTER 4 IMAGE FORMATION SYSTEM
Transfer cleaning
bias high-voltage
transformer
(T506)
Voltage
detection
Transfer bias
high-voltage
transformer
(T133)
Current
level
Drive
control
CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001
Photosensitive
Cleaning
bias out T133
Transfer
charging roller
Transfer
bias
output
Current
detection
Environment
(humidity)
drum
sensor
4-9 P