Charging Mechanism; Primary Charging Mechanism; Outline; Primary Charging Assembly Cleaning Mechanism - Canon ImageRunner iR8500 Series Service Manual

Chapter 8

8.4 Charging Mechanism

8.4.1 Primary Charging Mechanism

8.4.1.1 Outline

iR105i/iR105+ / iR9070 / iR85+ / iR8070
The primary charging mechanism is controlled for the following:
[1] Primary charging bias constant current
[2] Grid bias constant voltage
The follouing figure shows the construction of the primary charging control system.
A voltage input between 0 and 12 V,
used to control the current level of the
primary bias.

8.4.1.2 Primary Charging Assembly Cleaning Mechanism

iR105i/iR105+ / iR9070 / iR85+ / iR8070
8-16
When an overcurrent or an
undercurrent is detected, '0'.
When '1', high-voltage
output is ready.
J510A J723
0 V
1
HVDC-EN
2
PR-CNT
3
PR-ERR
4
GRD-CNT
5
6
7
8
9
10
11
12
13
14
15
16
The primary charging bias varies as
follows according to PR-CNT
potential.
Relay PCB
1 2 3 4
Primary charging wire
T601
16
15
14
13
J731
12
11
10
9
8
7
6
The grid bias varies as follows
5
according to GRD-CNT potential.
4
3
2
1
A voltage input between 0 and 12 V, used to
control the voltage level of the grid bias.
F-8-24
1600µA
800µA
3V 11V 12V
PR-CNT
Grid wire
900V
400V
3V
11V 12V
GRD-CNT
0006-9662
0006-9677