Sharp SF-1120 - Manual (Page 41)

Step 4 (Transfer)
The transfer paper is charged higher than the OPC drum surface
potential by strong negative discharge of the transfer charger, making
the binding force between the transfer paper and toner stronger than
that between the drum and toner, attracting toner to the transfer
paper.
Step 5 (Separation)
After transfer, the copy paper and the drum are negatively charged.
Since, however, the negative potential of the copy paper is higher
than that of the drum, a attraction force is applied between the drum
and the copy paper. To avoid this, AC corona is applied to the copy
paper by the separation charger to decrease the copy paper potential
to the same level as the drum surface potential. The attraction be-
tween the copy paper and the drum is weakened by this, allowing
separation of the copy paper by its own extending force. If the copy
paper is not separated by the separation charger, it is separated by
the separation pawl mechanically.
Main corona unit Blank lamp
Cleaning blade
Discharge lamp
Seperation pawl
Seperation corona unit
Transfer corona unit
Resist roller
MG roller
Developer unit
CGL
CTL
OPC drum
Aluminum
layer
High voltage unit
Transfer corona unit
Transfer paper
Toner
CGL
CTL
OPC drum
Seperation corona unit
Transfer paper
Toner
Aluminum
layer
High voltage unit
Main corona unit Blank lamp
Cleaning blade
Discharge lamp
Seperation pawl
Seperation corona unit
Transfer corona unit
Resist roller
MG roller
Developer unit
5 – 12