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COPYRIGHT
©
2000 CANON INC. CANON imageRUNNER 600 REV.1 JAN. 2000 PRINTED IN U.S.A.
6-5
CHAPTER 6 IMAGE FORMATION SYSTEM
Figure 6-201 Construction of the Control System
II . POTENTIAL CONTROL
A. Outline
Part 2>Chapter 5>2
The potential is controlled for the following:
[1] Determining the optimum grid bias. (VD control)
[2] Determining the optimum laser output. (VL control)
[3] Determining the optimum developing bias (DC). (Vdc control)
Figure 6-201 shows the construction of the control system:
Primary charging wire
Potential sensor
Grid wire
Laser light
Developing cylinder
DC controller PCB
Laser driver PCB
High-voltage DC PCB
DC bias
DC bias
DC bias
Control
signal
Control
signal
Detection signal
J502
J3
11
12
13
14
4
3
2
1
0 V
24 VU
POT-DT
POT-ON
Potential control
PCB
Drum surface
potential reading
When '1', the potential
sensor turns on.