Sharp AR-650 Servisní příručka stáhnout pdf (Strana 218)

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12 - 3 DEVELOPER UNIT

(4) Lower and upper developer sleeves (magnetic rollers)/transport roller (magnetic roller)

These parts are made of aluminum, with magnets positioned inside them. By using the magnetic

force, the developer material is attracted (because the carrier is made of iron powder), forming mag-

netic lines of force shaped like a brush. Further, the magnets are secured, and only the sleeves

around them rotate. Through this rotation, the magnetic brush of the lower and upper developer

sleeves sweeps the surface of the photosensitive drum, enabling development.

(5) Leveler

This regulates the amount of developer material transferred by the transport roller so that the mag-

netic brush correctly comes into contact with the surface of the photosensitive drum.

(6) Separation auxiliary member

This member supports the task of separating the developer material on the lower developer sleeve.

(7) Auto-toner sensor

For making good copies, it is necessary to keep the carrier and toner in the developer unit at a fixed

ratio. The auto-toner sensor monitor the toner density in the developer material by operating a mag-

netic bridge circuit. When the toner density drops, a fixed amount of toner is added from the toner

hopper.

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