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CHAPTER 6 IMAGE FORMATION SYSTEM
6-32
COPYRIGHT
©
1999 CANON INC. CANON imageRUNNER 600 REV.1 JAN. 2000 PRINTED IN U.S.A.
F. Controlling Separation Charging
1. Outline
The separation mechanism is controlled for the following:
[1] DC bias constant current
[2] AC bias constant current
[3] output correction to suit the environment and deposit of toner (fuzzy control)
[4] output correction upon detection of leakage
Figure 6-313 shows the construction of the control system for the separation charging mecha-
nism.
Figure 6-313 Construction of the Control System
DC controller PCB
J510A
J723
J722
AC+DC
J741
J742
J721
J734
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
HVAC-EN
24VP
GND
GND
HVAC-CNT
HVAC-ON
SPDC-CNT
PT/SP-ERR
HVAC-CNT
High-voltage DC PCB
GND
GND
1
2
3
4
Relay PCB
4
2
1
1
2
3
4
3
5
5
1
2
3
4
5
12KVPP
8KVPP
3V
11V 12V
HVAC-CNT
The AC bias voltage level varies
according to the HVAC-CNT potential.
Separation
charging wire
High-voltage AC
transformer
High-voltage AC
PCB
When '1', the high-voltage
DC output is ready.
500µA
3V
11V 12V
SPDC-CNT
The level of the DC bias varied to suit the
SPDC-CNT potential.
When an overcurrent
or an under current is
detected, '1'.
A voltage input between 0 and 12 V, used to control
the current level of the separation bias.
When '1', high-
voltage output
turns on.
When '1',
high-voltage
AC output is
ready