Controlling The Transfer Guide Bias; Outline - Canon GP605 Service Manual

D.

Controlling the Transfer Guide Bias

1.

Outline

To prevent soiling of the surface of the transfer guide with toner (leading to soiled backs), a
bias of the same polarity as toner is applied to the transfer guide. The transfer guide charging
mechanism is controlled for the following:
[1] Transfer guide bias constant voltage
[2] Output to suit the environment
Figure 6-307 shows the construction of the transfer guide bias
When '1', high voltage output is ready.
J510A
1
HVDC-EN
2
3
4
5
6
7
When '1', the transfer
8
guide bias turns on.
9
10
11
12
13
14
FGD-ON
15
FGD-CNT
16
Figure 6-307 Construction of the Control System
COPYRIGHT © 1999 CANON INC.
Relay PCB
1 2 3 4
J723
0 V
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
'1' : +200V
'0' : +600V
CANON GP605/605V REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 6 IMAGE FORMATION SYSTEM
J733
1
DC 600V/200V
2
Transfer guide
6-25