Oki OF5300, Service Manual

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Page: 267
Service Manual for OF5300/5600
Chapter B Print Operation Description
Toner is attracted to the electrostatic latent image on the image drum surface to convert it into a visible
toner image. Developing takes place at the contact between the image drum and the developing roller.
1 As the toner supply roller rotates while rubbing on the developing roller, a friction charge is generated
between the developing roller and the toner, allowing the toner to be attracted to the developing roller.
(The developing roller surface is charges positive and the toner, negative.)
2 The toner attracted to the developing roller is scraped off by the doctor blade, forming a thin coating of
toner on the developing roller surface.
3 Toner is attracted to the exposed part (low-potential part) of the image drum at the contact between the
image drum and the developing roller, making the electro-static latent image visible.
Note: The toner supply roller and the developing roller are supplied with bias voltages required during the
developing process as shown below. -450 VDC is supplied to the toner supply roller, -300 VDC to the
developing roller.