PRINTER
November 29, 1999
2-8
2.2 PRINTER
2.2.1 OVERVIEW
Process
Description
Charge
Charges the drum with –600Vdc plus 1.05mA 1kHz 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 –100V.
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 : -400Vdc plus 1.6kVp-p 2kHz 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
D r u m
C h a r g e
Laser
E x p o s u r e
D e v e l o p m e n t
Guide Sheet
I m a g e
Transfer
P a p e r
Q u e n c h i n g
O P C
D C - 6 0 0 V
D C - 1 0 0 V
D C - 4 0 0 V
H306D529.WMF
