Oki MB280, Руководство по обслуживанию, Страница: 5 / 43

PRINTER 3000 304 995 - 01
i
PRINTER MODEL-L1
（
G191
）
SERVICE MANUAL
TECHNICAL DOCUMENT
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6 September 2005
1-2
1.2 PRINTING
1.2.1 PRINTING PROCESSES AROUND THE DRUM
This machine uses a “write to black” system, using negative toner.
Charge: The charge brush roller [A] gives the OPC drum [B] surface a negative
charge.
Exposure: A laser [C] writes a latent image on the drum. The charge in the area
exposed by the laser beam drops.
Development: The development roller [D] carries toner to the drum and develops
the latent image on the drum. The following charges are applied.
Development bias (during printing):
Toner application roller [E]
Development roller [D]
Switching bias (At the start and the end of any print process):
Toner application roller [E]
Development roller [D]
Image Transfer: The transfer roller [F] pulls the toner from the drum onto the
paper [G].
Paper Separation: The antistatic brush [H] removes the charge on the underside
of the paper to help the paper separate from the drum.
Drum Cleaning: The Discharge Lamp[L] discharge the OPC drum [B] surface,
The cleaning blade [J] removes any toner remaining on the drum
after the image is transferred to paper.
The high voltages [K] are supplied from the Power Supply Unit board.
G182D010.WMF
[A]
[B]
[C]
[D]
[E] [F]
[G]
[H]
[J]
[K]
[K]
[L]