Actual Process - Sharp SF-2014 Service Manual

(3) Actual process

Step 1 (charging)
The OPC drum is negativelycharged by corona discharge of the
transfer charger . Positive charges are generated in the aluminum
layer.
Aluminum layer
CGL
CTL
High voltage unit
Step 2 (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 move to the positive charges generated in the alu-
minum layer in step 1, and the positive charges move to the negative
charges on the OPC drum surface charged in step 1. The positive
charges and the negative charges are neutralized each other in the
aluminum layer and on the OPC drum surface. As a result, the OPC
drum surface potential becomes 20V
Light
CTL
CGL
Aluminum layer
By performing step 1 (Charging) and step 2 (Discharging), the pho-
toconductor itself is initialized to stabilize the drum surface potential.
OPC drum
Seperation pawl
Transfer corona unit
30V.
Discharge lamp
OPC drum
Main corona unit
Discharge lamp
Cleaning blade
Seperation corona unit Transfer corona unit
Main corona unit
Discharge lamp
Cleaning blade
Seperation pawl
Seperation corona unit Transfer corona unit
5 – 7
Blank lamp
Developer unit
MG roller
Resist roller
Blank lamp
Developer unit
MG roller
Resist roller