Sharp UX-4000M Service Manual - Page 53
voltage in development, Transition of OPC drum surface potential by print
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7-6. OPC drum surface potential (1) Transition of OPC drum surface potential by print operation UX-4000MU FO-2950MU/C (2) OPC drum surface potential and developing bias voltage in development OPC surface potential (-V) OPC drum surface potential (-V) -850V Laser beam Dark area potential -250V Toner attachment potential Developing bias Charging/ cleaning Light area potential Exposure Residual Transfer toner collection /Developing Timer (OPC drum rotating angle) Charging Fig. 18 Start -400V During developing Dark area potential Stop Developing bias Light area potential Time (OPC drum rotation angle) Fig. 19 3 - 10
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UX-4000MU
FO-2950MU/C
7-6. OPC drum surface potential
(1)
Transition of OPC drum surface potential by print
operation
(2) OPC drum surface potential and developing bias
voltage in development
-850V
-250V
Laser beam
Dark area
potential
OPC surface potential (-V)
Light area
potential
Developing
bias
Charging/
cleaning
Exposure
Residual
toner collection
/Developing
Timer (OPC drum rotating angle)
Transfer
Charging
Toner attachment
potential
-400V
OPC drum surface potential (-V)
Light area potential
Time (OPC drum rotation angle)
Start
During
developing
Stop
Dark area
potential
Developing
bias
Fig. 18
Fig. 19
3 – 10