Potential Control; Outline - Canon iR5000 Service Manual

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:
Control signal
Control signal
J103
0V
B4
POT-DT
B3
POT-ON
B2
24V
B1
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.
COPYRIGHT © 2000 CANON INC.
Determining laser output
Primary charging wire
Determining primary current
Developing
cylinder
Determining developing bias(DC)
[1]
[2]
2000 2000 2000 2000
CHAPTER 4 IMAGE FORMATION SYSTEM
CANON iR5000/iR6000 REV.0 JULY 2000
Laser light
Potential sensor
J3
1
2
3
4
4-5 P