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2.4
Process Unit
2.4.1
Photosensitive Drum
Generates the latent electrostatic image and develops the image on the drum surface.
2.4.2
Primary Charger
Forms a uniform charge on the drum surface.
(1) Corona wire
Generates ion on the drum.
(2) Grid
Spreads the ion evenly over the drum.
2.4.3
Developer Roller
Develops the latent electrostatic image on the drum surface by the toner.
2.4.4
Transfer Roller
Transfers the toner image to the paper from the drum surface.
2.4.5
Cleaner Blade
Remove the toner remaining on the drum surface.
2.4.6
Toner Auger
Transport the waste toner from the cleaner to the developer unit.
2.4.7
Erase lamp
Discharges the electrostatic latent image on the drum.
2.5
Print Process
2.5.1
Charging
The drum is charged to appox +700V by ion which is generated by the primary charger.
Ion is generated by an ionization of the corona wire, which applied DC bias from High
Voltage Power Supply. The flow of ion is controlled by the grid to be distributed evenly
on the drum surface. The other end of the grid is grounded to the frame through the
varistor.
The primary charge uses a corona wire, but since the charging terminal of the drum is
a positive terminal , only less than 1/10 of the usual quantity of ozone is generated. The
level of ozone expelled from the printer is therefore not harmful to the human body.
Applicable safety standards have been complied with.
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Grid
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Varistor
Corona wire
Fig. 2.24
II - 18
Aluminum pipe
Organic Photoconductor layer
HVPS
Drum
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Troubleshooting
