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PRINTER
2.2 PRINTER
2.2.1 OVERVIEW
D r u m
Charge
Laser
Exposure
Development
Process
Charges the drum with –600Vdc plus 1.05mA 1kHz ac bias.
Charge
The ac bias quenches the remaining charge on the OPC.
Writes the black parts of the image. The surface voltage of the
Laser
exposed areas of the drum drops to about –100V.
Exposure
Negatively charged toner is transferred to the exposed surface
Development
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 : -400Vdc plus 1.6kVp-p 2kHz ac
A transfer roller transfers toner from the drum to the paper.
Image
The value of the transfer bias depends on the paper size.
Transfer
To clean the transfer roller, negative bias is applied
periodically.
The paper discharge brush separates the paper from the
Separation
drum.
The cleaning blade removes any toner remaining on the drum
Cleaning
surface after image transfer.
Cleaning
O P C
D C - 6 0 0 V
D C - 1 0 0 V
D C - 4 0 0 V
Guide Sheet
2-8
Paper
Quenching
Description
November 29, 1999
I m a g e
Transfer
H306D529.WMF
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