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COPYRIGHT
©
1999 CANON INC. CANON imageRUNNER 600 REV.1 JAN. 2000 PRINTED IN U.S.A.
6-39
CHAPTER 6 IMAGE FORMATION SYSTEM
Figure 6-404 Construction of the Control System
D. Controlling the Developing Bias
The developing bias is controlled for the following:
[1] DC bias constant voltage
[2] AC bias constant voltage
DC controller PCB
J510A J723
J721
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
DEV-DC-CNT
DEV-AC-ON
GND
GND
1
2
3
4
Relay PCB
Developing cylinder
J732
500V
3V
11V 12V
DEV-DC-CNT
Developing DC bias
The developing DC bias varies as
follows according to the DEV-DC-CNT
potential.
image area
Non-image
area
High-voltage DC PCB
When '1', developing
AC bias is generated.
AC output 1000 Vpp
A voltage input between 0
and 12 V, used to control the
voltage level of the
developing DC bias.
When '1', developing AC
bias is generated.