September 4, 2017 by v4toner
1.Reasons for the occurrence of the bar: (1) the developer is surrounded by the carrier and the toner is sucked or spilled on the paper by the photosensitive drum. (2) the developer in the mixer is running bad or hp toner damp agglomeration due. (3) mirror or lens pollution, cleaning it.
2.The reason of the vertical black bars: Find the cause of the fault in the order of the drum, cleaning, developing, and fixing parts. (1) The drum is in contact with other parts, or the surface of the drum is damaged by friction due to excessive blade pressure. (2) scraper blade is defective or blade powder too much. (3) the development of the toner on the roller is uneven, was strip-like distribution or scraper under the debris. (4) magnetic roller with a strip of toner powder. (5) the fuser inlet is clogged, and the portion which has not yet been fixed after the transfer is rubbed against the fuser entrance and the image is damaged. (6) The surface of the heating roller is stained with toner and other dirt.
3.The emergence of vertical white bars: (1) photosensitive drums produce serious scratches caused by printing on the toner. (2) charge the electrode wire dirt caused by the corresponding part of the photosensitive drum does not charge the power of white bars. (3) low supply voltage caused by uneven charging voltage and produce different width and the edge of the white bar. (4) transfer electrode wire is too dirty and can not be properly transferred. (5) the tn660 toner is small and uneven or the separation claw is deformed.
4. Reason of no image, paper black: may be the control circuit or scan circuit failure. 5. Full white image Cause: The optical part, the charging part and the mechanical part are involved. (1) laser or laser control circuit is damaged. (2) the optical system is blocked by foreign matter; mirror angle is not right; mirror is damaged or dirty; mirror surface aging. (3) scan drive circuit failure, that is, no scan. (4) the charging electrode is damaged; the charging electrode wiring is broken; the transfer electrode is in poor contact or the electrode wire is broken. (5) transmission gear shaft rotation, and the wheel does not turn, so that the photosensitive drum does not turn.