Brother International HL 1850 Service Manual - Page 212

HL-1850/1870N SERVICE MANUAL 1-13 Image distortion Lip Possible cause Laser unit installation Scanner LD emission failure Scanner motor rotation failure Scanner connection failure Step Check 1 Is the laser unit secured to the frame incorrectly? (Check if there is any play.) 2 Is the laser diode or the scanner motor defective? 3 Is the scanner harness connected properly? (Check if it is coming loose.) Result Remedy Yes Secure the unit correctly and tighten the screws. Yes Replace the laser unit. No Connect the harness correctly. 1-14 Faint print Possible cause Printer installation Toner cartridge Scanner window dirty Laser unit failure Step Check 1 Is the printer placed , horizontally? 2 Does the problem happen immediately after replacing the toner cartridge with a new , one? 3 Is the scanner window dirty? 4 Is the problem solved by replacing the laser unit? Result Remedy No Place the printer on a flat . surface. Yes Remove and carefully shake the toner cartridge horizontally. . Yes Clean the scanner window with a soft dry cloth. Yes Replace the laser unit. 6-45