Oki C9200 Service Manual page 19

(4) Developing
By the adhesion of toner to the latent electrostatic image on the drum surface, the image is
changed to a toner image. The developing is processed at the contact part between the OPC
drum and the developing roller.
1 The sponge roller causes toner to adhere to the developing roller. The toner becomes
negatively charged.
2 The developing blade removes excess toner from the developing roller and a thin layer
of remaining toner is formed on the developing roller.
3 The toner is drawn by the latent electrostatic image at the contact portion between the
OPC drum and the developing roller.
The latent electrostatic image on the drum surface is made visible with the toner.
(5) Transferring
The transfer roller, which is made of conductive sponge, presses paper against the surface
of the OPC drum and brings the paper into intimate contact with the drum surface.
The paper is placed on the drum surface and positively (opposite to the charge of the toner)
charged by the transfer roller on its back.
Applying positive high voltage from the power supply to the transfer roller moves the positive
charge induced by the transfer roller to the paper surface at the contact portion between the
transfer roller and the paper, the paper surface drawing the negatively charged toner from the
drum surface.
41388601TH Rev.2
Developing roller
Charging roller
OPC drum
OPC drum
Transfer roller
Developing blade
Sponge roller
Developing roller
Paper
Carrier belt
Power unit
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