Oki OKIFAX 5750 Maintenance Manual page 512

Okifax 5750/5950 facsimile transceiver

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4) Developing

Toner is attracted to the electrostatic latent image on the EP (image) drum surface to

convert it into a visible toner image. Developing takes place at the contact between the

EP (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 EP (image) drum at

the contact between the EP (image) drum and the developing roller, making the

electrostatic latent image visible.

41285901TH Rev.3

Charge roller

+ + + + + + + + + + + + + + + + + + + + + + +

An illustration of activities at the contact point of the

image drum surface and the developing roller (arrow

marks denote the direction of the electric field).

Doctor blade

Toner supply roller

Developing roller

Troubleshooting