Brother International DCP 8040 Service Manual - Page 247

CHAPTER 6 TROUBLESHOOTING I-13 Image distortion Possible cause Laser unit installation Laser scanner LD emission failure Laser scanner motor rotation failure Laser scanner connection failure Step 1 2 Check Is the laser unit secured to the frame incorrectly? (Check if there is any play.) 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. I-14 Faint print Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Print out test print out test print out test Print out test print o Print out test print o Possible cause Machine installation Toner cartridge Scanner window dirty Laser unit failure Step 1 2 3 4 Check Is the machine placed horizontally? Does the problem happen immediately after replacing the toner cartridge with a new one? Is the scanner window dirty? Is the problem solved by replacing the laser unit? Result Remedy No Place the machine 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. 6-44