Sharp SF-2020 Service Manual page 43

Step 6 (Cleaning)
Residual toner on the drum is removed by the cleaning blade. The
removed toner is sent to the waste toner container by the waste toner
transport screw.
Blade CTL CGL
Residual toner
OPC drum
Step 7 (Discharging)
When the OPC drum is exposed to the discharge lamp light, positive
and negative charges are generated in the OPC drum CGL. The
negative charges generated in the CGL move towards the residual
positive charges in the aluminum layer, while the positive charges in
the CGL move towards the residual negative charges on the OPC
drum surface. Therefore, the positive and the negative charges are
neutralized in the aluminum layer and on the OPC drum surface,
removing the residual charges on the OPC drum surface. As a result,
the OPC drum surface potential becomes 20V ∼ 30V.
Residual charge
CTL
CGL
Aluminum layer
Aluminum layer
Discharge lamp
OPC drum
Residual charge
Main corona unit
Discharge lamp
Cleaning blade
Seperation pawl
Seperation corona unit Transfer corona unit
Main corona unit
Discharge lamp
Cleaning blade
Seperation pawl
Seperation corona unit Transfer corona unit
5 – 13
Blank lamp
Developer unit
MG roller
Resist roller
Blank lamp
Developer unit
MG roller
Resist roller