Kyocera Ecosys FS-600 Service Manual page 71

Operation theory
Operation overview
Anti-background
effect bias
Vo=-680V DC+1.8kVp-p AC (380Hz)
Vd=-450V
Development
-70V
The toner sensor is fit inside the developer unit (process unit) and has the following
components. The decrease in the toner-to-carrier mixture ratio at the developer bottom is
detected by the toner sensor at its diaphragm. The toner sensor then generates the
request the engine controller to drive the toner motor. Subsequently, when the toner-to-
carrier mixture is restored, the toner motor stops.
If the sensor's request for feeding toner does not succesfully restore the toner-to-carrier
mixture ration, the treatment mode is introduced. Nonetheless the treatment mode is not
able to restore it, the printer indicates the message that the toner is run out.
4-12
FS-600/FS-680