Controlling The Transfer Guide - Canon GP405 Service Manual

CHAPTER 6 IMAGE FORMATION SYSTEM
F. Controlling the Transfer Guide
1. Transfer Guide Bias
The transfer guide bias is used to prevent adhesion of toner to the transfer guide, and is negative
in polarity (-400 VDC; toner is also charged to negative polarity).
The transfer guide bias is applied as soon as the control panel power switch is turned on, and
continued until power is removed.
AC power supply voltage input
Serial communication
Transformer drive signal
J103A J209A
6-14
Composite power supply PCB
Transformer
drive signal
Figure 6-108
COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
High-voltage
main transformer
Photosensitive
drum
Transfer
guide