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COPYRIGHT
©
1999 CANON INC. CANON imageRUNNER 600 REV.1 JAN. 2000 PRINTED IN U.S.A.
6-21
CHAPTER 6 IMAGE FORMATION SYSTEM
C. Controlling the Pre-Transfer Charging Mechanism
1. Outline
The pre-transfer charging mechanism is controlled for the following:
[1] DC bias constant current
[2] AC bias constant voltage
[3] Output to suit the environment (fuzzy control)
Figure 6-304 shows the construction of the pre-transfer charging control system.
Figure 6-304 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
GND
GND
HVAC-ON
24VP
PTDC-CNT
PT/SP-ERR
High-voltage DC PCB
GND
GND
1
2
3
4
Relay PCB
Pre-transfer charging wire
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
High-voltage
AC PCB
High-voltage
AC transformer
When '1', high-voltage
DC output is ready.
300µA
3V
11V 12V
PTDC-CNT
The current level of the pre-transfer bias
varies as follows according to the PTDC-
CNT potential.
When an overcurrent or
an undercurrent is
detected, '1'
A voltage input between 0 and 12 V, used to control the
level of current of the pre-transfer bias.
When '1', high-voltage AC
output turns on.
AC output 9.0 kVpp
When '1',
high-voltage AC
output is ready.