Brother International MFC 8890DW Service Manual - Page 129
Downward fogging of solid color, Horizontal lines
UPC - 012502622673
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■ Downward fogging of solid color - Toner may be empty. Replace the toner cartridge with a new one. Step 1 2 Cause Check HVPS PCB failure Is the problem solved after replacing the HVPS PCB ASSY? Main PCB failure Is the problem solved after replacing the main PCB ASSY? Result Remedy Replace the HVPS PCB Yes ASSY. Replace the main PCB Yes ASSY. ■ Horizontal lines - The paper tray ground terminal provided in the machine body may be dirty. Clean the contact with a dry cloth. Step 1 2 3 Cause Check Result Remedy Dirt on 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 machine body Is the paper tray ground terminal bent, which is provided in the machine body? Correct bending of paper Yes tray ground terminal. Laser unit failure Is the problem solved after replacing the laser unit? Replace the laser unit. Yes 3-57 Confidential