Brother International DCP-8085DN Service Manual - Page 124
Black horizontal stripes
UPC - 012502622703
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■ Black horizontal stripes - Clean the inside of the machine and the corona wire in the drum unit. - Replace the drum unit with a new one. Step 1 2 3 4 5 6 7 Cause Check Result Remedy Dirt on the charged electrode Are the electrodes on the drum unit and machine body dirty? Clean both electrodes. Yes (Refer to Fig. 3-2, Fig. 3-3.) Paper tray ground terminal provided in the machine body Is the paper tray ground terminal bent, which is provided in the machine body? (Refer to Fig. 3-7.) Correct bending of paper tray ground terminal. Yes Toner attached on the develop roller Are the horizontal stripes at 42.5 mm (develop roller circumference) intervals? This problem will disappear by Yes printing approximate 10 pages. If the same problem occurs, replace the toner cartridge. Scratch and Dirt on the exposure drum Are the horizontal stripes at 94.2 mm (exposure drum circumference) intervals? Replace the drum unit. Yes Scratch and Dirt Are the horizontal stripes Replace the fuser unit. on the heat roller at 78.5 mm (heat roller Yes circumference) intervals? HVPS PCB failure Is the problem solved after replacing the HVPS PCB ASSY? Replace the HVPS PCB Yes ASSY. Main PCB failure Is the problem solved after replacing the main PCB ASSY? Replace the main PCB Yes ASSY. Bottom surface of Paper tray Paper tray ground terminal. Fig. 3-7 3-52 Confidential