Brother International HL 1850 Service Manual - Page 210

HL-1850/1870N SERVICE MANUAL 1-9 i r White vertical streaks A 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 printer'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 Transfer failure Condensation Step Check Result Remedy 1 Is the transfer roller scratched? Yes Replace the drum unit. 2 Has condensation occurred inside the printer? Yes Try to print several pages or leave the printer 2 hours to allow it to reach room temperature. 1-10 White horizontal stripes ri 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 printer 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 printer body and toner cartridge dirty? Result Remedy Yes Clean the electrodes at both sides. Ground contacts (4) 6-43