COPYRIGHT © 1999 CANON INC.
CANON GP605/605V REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
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.
Summary of Contents for GP605
Page 3: ......
Page 4: ......
Page 24: ......
Page 56: ......
Page 78: ......
Page 116: ......
Page 124: ......
Page 148: ......
Page 150: ......
Page 168: ......
Page 170: ......
Page 250: ......
Page 252: ......
Page 342: ......
Page 390: ......
Page 392: ......
Page 464: ......
Page 466: ......
Page 512: ......
Page 514: ......
Page 572: ......
Page 574: ......
Page 590: ......
Page 592: ......
Page 854: ......
Page 870: ......
Page 874: ......