Potential Control; Outline - Canon GP605 Service Manual

II . POTENTIAL CONTROL
A.

Outline

Volume 2>Chapter 4>I.B. "Controlling the Surface Potential of the Drum"
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:
Control
signal
Control
signal
0 V
14
POT-DT
13
POT-ON
12
24 VU
11
J502
Drum surface
potential reading
Figure 6-201 Construction of the Control System
COPYRIGHT © 1999 CANON INC.
Primary charging wire
Grid wire
DC bias
DC bias
DC bias
Developing cylinder
When '1', the potential
sensor turns on.
CANON GP605/605V REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 6 IMAGE FORMATION SYSTEM
Laser light
J3
1
2
3
4
Potential sensor
6-5