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E. Controlling the Primary
Charging Roller Bias
1.
Outline
Figure 3-307 shows the circuit that con-
trols the application voltage of the primary
charging roller, and the circuit has the follow-
ing functions:
* turns on and off the DC bias.
* controls the AC bias to a constant volt-
age.
* switches the DC bias voltage level.
* controls the scanning lamp ON voltage
level.
The primary charging roller is given a
DC bias so as to maintain the surface poten-
tial of the photosensitive drum to a specific
value. The DC bias is switched according to
whether or not a copy image is being
formed.
Reference: ————____—_
DC component:
-900/-1376V
—
ial
AC power
Ny
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a
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7102
VA
Q20
=
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cc
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als 8
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Microprocessor
Figure 3-307
COPYRIGHT © 1995 CANONINC.
CANON NP6O12 /NPGOI2F/NP6212 REV.1 SEPT. 1995 PRINTED IN JAPAN (IMPRIME AU! JAPON)
3-23
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