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Se
ESS
eT]
OPERATIONS
AND TIMING ints
¢. Primary Charging Control
Circuit
1.
Quiline
Figure 3-16 shows the circuit that con-
trois the primary charging, and the circuit
has the following functions:
* Turns the DC bias ON and OFF.
¢ Turns the AC bias ON and OFF.
* Controls the DC bias voltage
(constant).
* Controls the AC bias current
(constant).
A DC bias (-625 V/-240 V) and an AC
bias are applied to the primary charging
oN
roller to maintain the surface potential of the
ey
photosensitive drum uniform.
ee
During document exposure (-625 V) and
non-exposure periods (-240 V) DC bias is
switched by the DC bias high output com-
mand (HVPHO).
The DC bias and AC bias are turned ON
and OFF by the DC bias ON command
(HVPDC)
and AC bias ON command
(HVPAC), respectively.
ReFErEN CES exit ceresiceern namsesmernereseraasmnsnesecesnsconenenansSeO
Unless the document is being illuminat-
ed, the DC bias is switched to -240V to
prevent adhesion of toner on the photo-
sensitive drum.
COPYRIGHT © 1994. CANONINC.
CANON PC300:320/325, FC210/290 REV.O JULY 1994 PRINTED IN JAPAN (IMPRIME AU JAPON)
3-17
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