Olivetti d-Copia 3003MF, Service Manual

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2MH/2MJ/2MK/2ML
2-1-11
2-1-4 Developing section
The latent image constituted on the drum is developed into a visible image. The developing roller contains a
3-pole (S-NS) magnet roller and an aluminum cylinder rotating around the magnet roller. Toner attracts to the
magnet sleeve since it is powdery ink made of black resin bound to iron particles. Developing blade, magne-
tized by magnet, is positioned approximately 0.3 mm above the magnet sleeve to constitute a smooth layer of
toner in accordance with the magnet sleeve revolution.
The developing roller is applied with the AC-weighted, positive DC power source. Toner on the magnet sleeve
is given a positive charge. The positively charged toner is then attracted to the areas of the drum which was
exposed to the laser light. (The gap between the drum and the magnet sleeve is approximately 0.32 mm.) The
non-exposed areas of the drum repel the positively charged toner as these areas maintain the positive
charge.
The developing roller is also AC-biased to ensure contrast in yielding by compensating the toner’s attraction
and repelling action during development.
Figure 2-1-15 Developing unit and toner container
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3
4
6
7
8
5
2
1. Magnet sleeve
2. Magnet roller
3. Developing blade
4. Blade magnet 5. DLP screw A
6. DLP screw B
7. DLP case
8. Toner container
Y113860-1 Sevice Manual