Functional Overview
Image Formation System
The dc bias of the developing cylinder is adjusted to change the
force of attraction between the toner and drum by changing the
print density setting (from the front panel or through software). A
change in dc bias causes either more or less toner to be attracted to
the d~um, which in turn either increases or decreases the print
density. The print density variation is approximately t 10% (see
Figure 5-15). Both the primary and developer dc bias voltages are
changed in response to the density setting.
Developing cylinder
surface potential
f +V
&
Drum surface
/’
potential
-0
(exposed area)
2
------------ ----- ----- ---
—-
% --... --:----------- --ocbias
.—
s
~ -v
\
Drum surface
Time t -D
potential
(unexposed area)
Figure 5-15 Developing Potentials
a
5-30
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