14 June, 2002
PRINTER
6-9
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6.2 PRINTER
6.2.1 OVERVIEW
Process Description
Charge
Charges the drum with –600 Vdc plus 1.05 mA 1 kHz ac bias.
The ac bias quenches the remaining charge on the OPC.
Laser Exposure
Writes the black parts of the image. The surface voltage of the exposed
areas of the drum drops to about –100 V.
Development
Negatively charged toner is transferred to the exposed surface of the
drum.
The development roller does not contact the drum.
To prevent the toner from being attracted to a non-image area, the
development bias is changed for non-image areas.
Bias voltage : –400 Vdc plus 1.6 kVp-p 2 kHz ac
Image Transfer
A transfer roller transfers toner from the drum to the paper. The value of
the transfer bias depends on the paper size.
To clean the transfer roller, negative bias is applied periodically.
Separation
The paper discharge brush separates the paper from the drum.
Cleaning
The cleaning blade removes any toner remaining on the drum surface
after image transfer.
Cleaning
Drum
Charge
Laser
Exposure
Development
Guide Sheet
Image
Transfer
Paper
Quenching
OPC
DC-600V
DC-100V
DC-400V
H310D920.WMF
