COPYRIGHT © 2001 CANON INC.
2000 2000 2000 2000
CANON iR5000i/iR6000i REV.0 JUNE 2001
CHAPTER 4 IMAGE FORMATION SYSTEM
4-5 P
F04-201-01 Block Diagram of the Control System
The signals used are as follows:
[1]
POT-DT: drum surface potential measurement value.
[2]
POT -ON: when ‘1’, the potential sensor turns on.
2. Potential Control
2.1 Outline
The functions and control mechanisms related to the potential control system are as fol-
lows:
1.
Controlling potential for the copier/printer
2.
Correcting power (APC, i.e., Auto Power Control)
3.
Determining primary current (VD control)
4.
Determining laser output (VL control)
5.
Determining developing bias (DC; VDC control)
The control system related to potential control is designed as follows:
Primary charging wire
Potential sensor
Laser light
Developing
cylinder
DC controller PCB
Laser driver PCB
High-voltage PCB
Potential control PCB
Control signal
Control signal
Detention signal
J103
J3
1
2
3
4
B1
B2
B3
B4
0V
24V
POT-DT
POT-ON
[1]
[2]
Determining developing bias(DC)
Determining laser output
Determining primary current