Brother International HL 1850 Service Manual - Page 208

HL-1850/1870N SERVICE MANUAL 1-6 Black and blurred vertical streaks I 1.P 2 kjgAr User Check (1) Clean the corona wire in the drum unit. (2) Check that the corona wire cleaner is at the home position. (3) Check that the toner cartridge is not empty. (4) The drum unit may be damaged. Install a new drum unit. (5) The toner cartridge may be damaged. Install a new toner cartridge. Possible cause Step Corona failure 1 Dirt in the paper 2 feed system Scratch on the 3 drum Cleaning failure 4 , Scratch on the 5 heat roller Check Is the vertical block streak about 10mm wide? (Check if the wire cleaner is at its home position.) Is the paper cassette or feed system on the drum unit dirty with toner? Is the drum surface scratched? Is the drum surface dirty with toner in streaks? Is the surface of the heat roller scratched? Result Remedy Yes Return the wire cleaner to its home position. Yes Clean the toner off. Yes Replace the drum unit. Yes Replace the drum unit. . Yes Replace the fixing unit. NOTE: • Ifyouprint the same pattern continuously, the drum will be worn and black vertical streaks will appear on the paper. • This problem may occur with noise due to the corona wire being dirty. In that case, clean the corona wire with the wire cleaner. 6-41