Sharp AM-900 Service Manual page 63

8.7. OPC drum surface potential
8.7.1 Transition of OPC drum surface potential by print
operation
Laser
beam
-950V
-250V
Charging/ Exposure Residual
cleaning
Timer(OPC drum rotating angle)
Fig. 18
Dark
area
potential
Toner
Developing
attachment
bias
potential
Light area
potential
Transfer Charging
toner collection
/Developing
8.7.2 OPC drum surface potential and developing bias
voltage in development
Start
-180V
3 – 16
AM-900U
During
Stop
developing
Dark area
potential
Developing
bias
Light area potential
Time (OPC drum rotation angle)
Fig. 19