Brother International HL 1850 Service Manual - Page 219

1-22 Light rain HL-1850/1870N SERVICE MANUAL Possible cause Drum unit failure Drum connection failure Step . Check 1 Is the problem solved after replacing the drum unit? 2 Is the contact between the drum unit and printer body connected correctly? High-voltage power supply PCB failure 3 Is the problem solved after replacing the high-voltage power supply PCB? Result , Yes Remedy Replace the drum unit. No Clean contact electrode both on the drum unit and in the printer body. Yes Replace the highvoltage power supply PCB. Ground contact (8) 1-23 LP Ghost kj.Ar User Check (1) Check the paper used meets the recommended paper specifications. Damp paper, thick media or rough surfaced paper can cause the problem. (2) Check the printer's environment. High temperature and high humidity conditions can cause the problem. (3) Check that the appropriate media type is selected in the printer driver. (4) Try installing a new drum unit. Possible cause Driver setting Step 1 Check Is thin paper such as 64g/m2 used under the thick paper mode? Drum unit failure 2 Is the problem solved after replacing the drum unit? High-voltage power supply PCB failure 3 Is the problem solved after replacing the high-voltage power supply PCB? Result Remedy Yes 1) Change the current mode to the normal mode from the driver setting. 2) Print 5 or 6 blank pages if this problem occurs. Yes Replace the drum unit. Yes Replace the high-voltage power supply PCB. 6-53