Sharp AR-6020V Service Manual page 125

B. Developing operations
Electrostatic latent images formed on the OPC drum surface by the
laser (writing) unit (laser image beams) are converted into visible
images by toner.
layer
CGL
Aluminum
CTL
Drum
-400V
Toner in the developing unit is stirred by the mixing roller.
When toner is stirred, it is negatively charged by mechanical fric-
tion.
The developing bias voltage (negative) is applied to the developing
roller.
Negatively charged toner is attracted and attached to the area on
the OPC drum where negative voltage is reduced by exposure.
On the other hand, the negative voltage at an area where exposure
is not made is higher than the developing bias voltage, and toner is
not attached.
AR-6020V OPERATIONAL DESCRIPTIONS 11 – 18