Olivetti d-Copia 3501 Service Manual page 66

C. Operational descriptions
Electrostatic latent images formed on the OPC drum by the LED
(writing) unit (LED image light) are converted into visible images
by toner.
-500V
(-470V)
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 develop-
ing 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 expo-
sure is not made is higher than the developing bias voltage, and
toner is not attached.
Y105220-6
layer
CGL
Aluminum
CTL
Drum
Sevice Manual 7-17