Controlling The Developing Bias - Canon NP6330 Service Manual

F. Controlling the Developing Bias
1. Outline
Figure 4-108 shows the circuit used to control the developing bias, and the circuit
has the following functions:
Turning on and off the DC component of the developing bias.
Controlling the voltage level of the DC component of the developing bias.
Turning on and off the AC component of the developing bias.
J114 J401
-7B ACON
*
DC
controller
PCB
-6B
DPON
*
-12B DCBC
COPYRIGHT © 1997 CANON INC.
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Remote
-7
AC drive circuit
circuit
-8 Remote
circuit
Amplifier
-2
circuit
High-voltabe transformer (HVT)
Figure 4-108
CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 4 IMAGE FORMATION SYSTEM
AC high-voltage
transformer
DC high-voltage
transformer
DC drive circuit
Dp
Developing
cylinder
Photosensitive
drum
4-11