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the serial line, a developing DC bias is
applied to the developing cylinder.
When the VERTICAL SYNC signal
controller, the DEVELOPING BIAS AC
ON signal is sent from the DC
controller via the serial line, and the
voltage comprising the developing DC
bias and developing AC bias is applied
to the developing cylinder.
The developing DC bias changes
with the image density data sent from
the DC controller via the serial line,
and the image density can be adjusted.
AC
bias
--
c. Transfer charging roller voltage
generation
A negative or between-page or print
bias is applied to the transfer charging
roller according to the print sequence.
A negative bias voltage is applied to
the transfer charging roller during
appropriate time to move the toner
attached to the transfer charging roller
to the photosensitive drum, and so
clean the roller.
A print bias voltage is applied to the
transfer charging roller to transfer the
toner on the photosensitive drum to the
paper.
A between-page bias is applied to
prevent the damage of the photo-
sensitive drum in the defined timing. It
is lower positive voltage than the print
bias.
When the /PRNT signal from the
video controller becomes "L". initial
rotation starts and a negative bias is
applied to the transfer charging roller
for a certain time to clean the roller. A
print bias is also applied during the
print sequence to transfer toner to the
d.
DC
bias
paper.
After completion of printing, a between-
page and a negative biases are applied
again to clean the transfer charging
roller.
Toner sensing/cartridge sensing
EP-E cartridge has a toner sensor
The
that detects the toner level and whether
there is a cartridge when the
developing AC bias is applied to the
developing
cylinder
DEVELOPING BIAS AC ON signal.
The detection result is sent to the DC
controller via the serial line.
by
the
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