Brother International MFC-P2000 Service Manual - Page 81

I-7 Black and blurred horizontal stripes Possible cause Scratch on the drum Toner stuck on the developer roller Scratch on the fixing roller High-voltage power supply PCB Step 1 2 3 4 Check Are the horizontal stripes at 94 mm (photosensitive drum) intervals? Are the horizontal stripes at 25 mm (developer roller) intervals? Are the horizontal streaks at 63 mm (heat roller) intervals? Is the problem solved after the high-voltage power supply PCB is replaced? Result Yes Yes Yes Yes Remedy Replace the drum unit. Print several sheet and see what happens. The problem will disappear after a while. If not, replace the drum unit. Replace the fixing unit. Replace the high-voltage power supply PCB. I-8 Black vertical streaks (in a gray background) Possible cause Stains on the CIS window CIS unit failure Step 1 2 Check Are there any stains on the CIS window? Is the problem solved after the CIS unit is replaced? Result Remedy Yes Clean the CIS window. Yes Replace the CIS unit. Possible cause Translucent stain on the laser scanner window Step 1 Check Are there any stains on the laser scanner window? Result Yes Remedy Clean the laser scanner window. If it is not effective, replace the laser unit. IV-12