Controlling The Developing Bias - Canon GP605 Service Manual

D.

Controlling the Developing Bias

The developing bias is controlled for the following:
[1] DC bias constant voltage
[2] AC bias constant voltage
When '1', developing
AC bias is generated.
J510A
1
HVDC-EN
2
3
4
5
6
7
8
DEV-DC-CNT
9
10
11
12
13
14
15
16
A voltage input between 0
and 12 V, used to control the
voltage level of the
developing DC bias.
Figure 6-404 Construction of the Control System
COPYRIGHT © 1999 CANON INC.
Relay PCB
J721
J723
0 V
16
15
14
13
12
11
10
DEV-AC-ON
9
8
7
6
5
4
3
2
1
When '1', developing AC
bias is generated.
CANON GP605/605V REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 6 IMAGE FORMATION SYSTEM
AC output 1000 Vpp
1 2 3 4
J732
The developing DC bias varies as
follows according to the DEV-DC-CNT
potential.
Developing cylinder
500V
image area
Non-image
area
3V
11V 12V
DEV-DC-CNT
6-39