Brother International MFC 8890DW Service Manual - Page 128
Black spots, Black band
UPC - 012502622673
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■ Black spots - Damp (wet) paper might be used. Try to change to freshly unpacked paper. - Toner may be empty. Replace the toner cartridge with a new one. - If the problem is not solved after printing a few pages, the drum unit may have glue from label stock on the exposure drum surface. Refer to the previous page, and wipe it off gently with a cotton swab. - The drum unit may be damaged. Replace the drum unit with a new one. Step 1 2 3 4 5 6 Cause Check Result Remedy Toner attached on the develop roller Are the horizontal stripes at 42.5 mm (develop roller circumference) intervals? This problem will disappear by printing Yes approximate 10 pages. If the same problem occurs, replace the toner cartridge. Scratch and Dirt Are the horizontal stripes Replace the drum unit. on the exposure at 94.2 mm (exposure drum drum circumference) Yes intervals? Drum unit connection failure Are the electrodes on the drum unit and machine body dirty? Clean both electrodes Yes (Refer to Fig. 3-2, Fig. 3-3.) Scratch and Dirt Are the horizontal Replace the fuser unit. on the heat roller stripes at 78.5 mm (heat roller circumference) Yes 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. ■ Black band - Clean the inside of the machine and the corona wire in the drum unit. If the same problem occurs after cleaning, replace the drum unit with a new one. - The paper tray ground terminal provided in the machine body may be dirty. Clean the contact with a dry cloth. 3-56 Confidential