Brother International HL 1030 Service Manual - Page 152

CHAPTER 6 TROUBLESHOOTING I-7 Black and blurred horizontal stripes User Check (1) The drum unit may be damaged. Install a new drum unit. (2) Check the paper used meets the recommended paper specifications. (3) Clean the printer interior and the corona wire in the drum unit. Possible cause Step Check Scratch on the drum 1 Are the horizontal stripes at 94mm (photosensitive drum) intervals? Toner stuck on the developer roller 2 Are the horizontal stripes at 39mm (developer roller) intervals? Scratch on the heat roller Corona contact failure High-voltage power supply PCB failure 3 Are the horizontal stripes at 79mm (heat roller) intervals? 4 Are the charge electrodes between the printer body and the drum unit dirty? 5 Is the problem solved after replacing the high-voltage power supply PCB? Result Yes Yes Yes Yes Remedy The photosensitive drum was scratched. Replace the drum unit. After printing several pages, the problem will disappear. If not, replace the toner cartridge. Replace the heat roller. Clean both electrodes. Ground contacts ➂ Yes Replace the highvoltage power supply PCB. I-8 Black vertical streaks (in a gray background) Possible cause Translucent stain on the scanner window Corona failure Step Check Result Remedy 1 Is there any dirt on the scanner Yes 1) Clean the scanner window? window. 2) If it is not effective, replace the laser unit. 2 Is the corona wire dirty? Yes Clean the corona wire with the wire cleaner. Ground contacts ➁ 6-30