Controlling The Primary/Transfer Corona Current And The Grid Bias; Outline - Canon NP6330 Service Manual

D. Controlling the Primary/Transfer Corona Current and the Grid
Bias

1. Outline

Figure 4-104 shows the circuit used to control the primary/transfer corona current
and the grid bias of the primary charging assembly, and the circuit has the following
functions:
Turning on and off the primary/transfer corona current.
Keeping the primary/transfer corona current to a specific level.
Turning on and off the grid bias.
J114 J401
-8B
PTON*
DC
controller
PCB
-13B
GRCONT
COPYRIGHT © 1997 CANON INC.
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-6
Remote
AC drive circuit
circuit
Voltage control
circuit
Current cortrol
circuit
-1
Comparator
Drive circuit
circuit
High-voltage transfer (HVT)
Figure 4-104
CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 4 IMAGE FORMATION SYSTEM
Pr
Si
Primary
high-voltage
transformer
Gr
Tr
Transfer high-voltage
transformer
4-5