Brother International HL-1660E Service Manual - Page 26
Fixing stage, Step 6, Fixing, Drum cleaning stage, Step 7, Drum cleaning,
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3.2.4 Fixing stage The toner image transferred to the paper in the transfer stage is held only by electrostatic attraction and slight physical adhesion, so even a light touch will smear the image. In the fixing stage, the toner image is fixed by heating the paper and applying pressure. This fuses the toner particles to the paper to make a permanent image. Step 6 Fixing Upper fixing roller Halogen heater Toner Paper Lower fixing roller Figure 2.15 The upper roller surface is PFA-coated. The upper and lower roller surfaces are grounded via a diode to prevent the negative potential of the upper roller becoming higher than that of the lower roller, resulting in the toner being drawn to the lower roller, and adhering to the lower roller surface. 3.2.5 Drum cleaning stage In the transfer stage, not all the toner is transferred to the paper. Some remains on the photosensitive drum. This residual toner is cleaned off in the drum cleaning stage so that the next print image will be clear. Step 7 Drum cleaning Cleaning blade Photosensitive drum Cleaner container Sweeper strip Figure 2.16 Prior to the next printing, the residual toner on the drum surface is scraped away by the cleaning blade to clean the drum surface. The removed toner is collected in the cleaner container. II - 10