Controlling The Static Eliminator Bias - Canon NP6621 Service Manual

OPERATIONS AND TIMING
F. Controlling the Static Elimi-
nator Bias
1. Outline
Figure 3-307 show the circuit that controls the
static eliminator bias, and the circuit has the following
functions:
• Turns ON/OFF the static eliminator bias and
controls it to a constant voltage.
• Switches the static eliminator bias voltage
level.
Composite power supply PCB
DC controller PCB
3–44
T4
Static eliminator
bias drive
circuit
JLVCTL JCTL
Microprocessor
J5
J307
Q301
Microprocessor
Figure 3-307
COPYRIGHT © 1998 CANON INC.
24V
Transformer
circuit
CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Photosensitive
drum
Static
eliminator