Brother International MFC 8890DW Service Manual - Page 126
Faint print, White spots, Is the Toner Life End
UPC - 012502622673
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■ Faint print - Check that the machine is installed on a level surface. - Replace the toner cartridge with a new one. - Clean the scanner windows of the toner unit with a soft cloth. (Refer to Fig. 3-6.) - The drum unit may be damaged. Replace the drum unit with a new one. Step 1 2 3 Cause Check Main PCB failure Is the problem solved after replacing the main PCB ASSY? Laser unit failure Is the problem solved after replacing the laser unit? Toner empty sensor failure Is the "Toner Life End" message indicated on the LCD after replacing the current toner cartridge with a new one? Result Remedy Replace the main PCB Yes ASSY. Replace the laser unit. Yes Replace the toner sensor PCB ASSY. No ■ White spots - 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 next 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 Cause Check Toner attached on the develop roller Are the horizontal stripes at 42.5 mm (develop roller circumference) intervals? Scratch and Dirt on the exposure drum Are the horizontal stripes at 94.2 mm (exposure drum circumference) intervals? Drum unit connection failure Are the electrodes on the drum unit and machine body dirty? 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 This problem will disappear by printing Yes approximate 10 pages. If the same problem occurs, replace the toner cartridge. Replace the drum unit. Yes Clean both electrodes. Yes (Refer to Fig. 3-2, Fig. 3-3.) Replace the HVPS PCB Yes ASSY. Replace the main PCB Yes ASSY. 3-54 Confidential