Brother International HL 1850 Service Manual - Page 206
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UPC - 012502603900
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HL-1850/1870N SERVICE MANUAL 1-4 All black bAr User Check (1) Clean the corona wire of the drum unit. (2) The drum unit may be damaged. Install a new drum unit. Possible cause Corona failure Step Check 1 . Is the corona wire dirty? Result , Yes Remedy Ground contacts . Clean the corona wire with the wire cleaner. (2) 2 Is the corona wire broken? Yes Replace the drum unit. 3 Are the charge electrodes between the printer body and the drum unit dirty? Yes Clean both electrodes. (3) Harness connection 4 Is the laser unit connected to the main PCB correctly? No Connect the harness between the laser unit and the main PCB correctly. High-voltage power supply PCB failure Main PCB failure 5 Is the problem solved after replacing the high-voltage . power supply PCB? 6 Is the problem solved after replacing the main PCB? Yes , Yes Replace the highvoltage power supply PCB. Replace the main PCB. 6-39