Olivetti d-Copia 284MF Service Manual

Also see for d-Copia 284MF: Quick installation guide Quick installation guide Operation guide Operation guide

2JN2-1-112-1-4 Developing sectionThe 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 ispowdery ink made of black resin bound to iron particles. Developing blade, magnetized by magnet, is positioned approxi-mately 0.3 mm above the magnet sleeve to constitute a smooth layer of toner in accordance with the magnet sleeve revo-lution.The developing roller is applied with the AC-weighted, positive DC power source. Toner on the magnet sleeve is given apositive charge. The positively charged toner is then attracted to the areas of the drum which was exposed to the laserlight. (The gap between the drum and the magnet sleeve is approximately 0.32 mm.) The non-exposed areas of the drumrepel 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 repellingaction during development.Figure 2-1-15Developing unit and toner containerFigure 2-1-16 Developing section block diagram13467852(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 containerDLPDRNDevelopingclutch YC20-6BDevelopingrollerMagnet rollerMagnet sleeveDeveloping bias outputHigh voltage PWBControl PWBY111030-4 Service Manual