Brother International DCP 8040 Service Manual - Page 245

CHAPTER 6 TROUBLESHOOTING I-9 White vertical streaks User Check (1) Try to wipe the scanner window with a soft cloth. (2) The toner cartridge may be damaged. Install a new toner cartridge. (3) Check the machine's environment. High temperature and high humidity conditions can cause this problem. (4) Damp (wet) paper might be used. Try to change to freshly unpacked paper. Possible cause Dirt on the CCD. Transfer failure Condensation Step 1 2 3 Check Is there any dirt on that? Is the transfer roller scratched? Has condensation occurred inside the machine? Result Yes Yes Yes Remedy Replace the CCD. Replace the drum unit. Try to print several pages or leave the machine 2 hours to allow it to reach room temperature. I-10 White horizontal stripes User Check (1) Check the paper used meets the recommended paper specifications. A rough surfaced paper, damp paper or thick media can cause the problem. (2) Check that the appropriate media type is selected in the printer driver. (3) The problem may disappear by itself. Try printing multiple pages to clear this problem especially if the machine has not been used for a long time. (4) The drum unit may be damaged. Install a new drum unit. Possible cause Developing bias contact failure Step Check 1 Are the developing bias contacts between the machine and toner cartridge dirty? Result Remedy Yes Clean the electrodes at both sides. Ground contacts (4) 6-42