Brother International HL 5030 Service Manual - Page 208
All black, PCB failure
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CHAPTER 6 TROUBLESHOOTING I-4 All black 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? 2 Is the corona wire broken? Harness connection 3 Are the charge electrodes between the printer body and the drum unit dirty? 4 Is the laser unit connected to 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? Result Remedy Yes Clean the corona wire with the wire cleaner. Yes Replace the drum unit. Yes Clean both electrodes. Ground contacts (2) (3) No Connect the harness between the laser unit and the main PCB correctly. Yes Replace the highvoltage power supply PCB. Yes Replace the main PCB. 6-28