Controlling The Output To Suit The Environment - Canon GP605 Service Manual

CHAPTER 6 IMAGE FORMATION SYSTEM
2.

Controlling the Output to Suit the Environment

The transfer guide bias is controlled to an optimum level to suit the environment (conditions
identified based on data from the environment sensor).
A bias of the same polarity as the toner is
applied in sync with the rotation of the
photosensitive drum.
Normally, +600 V is applied to prevent
adhesion of toner to the transfer guide.
In a high humidity environment, paper tends to absorb moisture
(lower resistance), charging the paper in excess to affect transfer
(faulty transfer); as such, the output is decreased.
Related Service Mode
COPIER>OPTION>BODY>
TRNSG-SW
(transfer guide bias control mode
switching)
6-26
COPYRIGHT © 1999 CANON INC.
Normal/low humidity
High humidity
Figure 6-308 Transfer Guide Bias Output Table
0: switches to +200 V in high humidity. (default)
1: fixes the transfer guide bias to +600 V.
2: fixes the transfer guide bias to +200 V.
3: switches to +200 V in normal humidity.
4: switches to +200 V in low humidity.
The photosensitive drum is rotating;
yet, paper is not being fed.
Transfer guide bias
Paper passing
+600
+200
If transfer faults occur, select '2' through '4'.
CANON GP605/605V REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Paper being fed
+600
+600