Sharp FO-3150 Service Manual page 54

FO-3150U/C
7-6. OPC drum surface potential
(1) Transition of OPC drum surface potential by print
operation
Laser beam
-850V
-250V
Charging/ Exposure
cleaning
Timer (OPC drum rotating angle)
Fig. 18
Dark area
potential
Developing
Toner attachment
bias
potential
Light area
potential
Residual Transfer Charging
toner collection
/Developing
(2) OPC drum surface potential and developing bias
voltage in development
Start
-400V
3 – 10
During
developing
Dark area
potential
Developing
bias
Light area potential
Time (OPC drum rotation angle)
Fig. 19
Stop