Kyocera TASKALFA 300I, Service Manual

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2K5
2-1-11
(1) Single component developing system
This machine uses the single component developing system, and reversal processing is performed with a + charged drum
(a-Si) and a + charged magnetic toner.
With the single component developing system, toner is electrically charged by friction with the developing sleeve and +
charged when it passes through the magnetic toner blade. The toner that has passed through the magnetic toner blade
forms a uniform layer on the developing sleeve. When the toner layer comes to the location where the developing sleeve
is the nearest to the drum, toner moves between the drum and the developing sleeve by an electric field of the magnetic
pole. Then, when the developing sleeve rotates and passes through the nearest location to the drum, on the portion of the
drum that has been exposed to light, toner is attracted toward the drum by potential difference between the developing
bias and the drum surface and development is performed. On the other hand, on the portion of the drum that has not been
exposed to light, toner is attracted toward the sleeve and development is not performed. When toner comes to an area
where the gap between the drum and the developing sleeve is large, an electric field disappears and toner does not leave
the developing sleeve. Development is complete.
Figure 2-1-13 Single component developing system
North pole
South pole
Developing sleeve
Drum
Magnetic toner blade
Toner