CHAPTER 6 IMAGE FORMATION SYSTEM
6-16
COPYRIGHT © 1999 CANON INC.
CANON GP605/605V REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
III . CONTROLLING THE CHARGING MECHANISMS
A.
Controlling the Primary Charging Mechanism
1.
Outline
Volume 2>Chapter 6>I.C. "Controlling the Primary Charging Current"
The primary charging mechanism is controlled for the following:
[1] Primary charging bias constant current
[2] Grid bias constant voltage
Figure 6-301 shows the construction of the primary charging control system.
Figure 6-301 Construction of the Control System
DC controller PCB
High-voltage DC PCB
J510A
J723
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
0 V
24 VH
24 VH
HVDC-EN
PR-CNT
GRD-CNT
PR-ERR
GND
GND
1 2 3 4
Relay PCB
Primary charging wire
Grid wire
T601
J731
3V
11V 12V
1600µA
800µA
900V
400V
PR-CNT
3V
11V
GRD-CNT
12V
Gr
id bias
Pr
imar
y charging bias
The primary charging bias varies as
follows according to PR-CNT
potential.
The grid bias varies as follows
according to GRD-CNT potential.
When an overcurrent or an
undercurrent is detected, '0'.
When '1', high-voltage
output is ready.
A voltage input between 0 and 12 V,
used to control the current level of the
primary bias.
A voltage input between 0 and 12 V, used to
control the voltage level of the grid bias.
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