Brother International MFC-P2000 Service Manual - Page 76

I-2 Dark Possible cause Main PCB failure Laser unit failure Step 1 2 Check Is the problem solved after the main PCB is replaced? Is the problem solved after the laser unit is replaced? Result Remedy Yes Replace the main PCB. Yes Replace the laser unit. Possible cause Corona failure (soiled wire) Corona failure (contact failure) Drum unit failure High-voltage power supply PCB Main PCB Panel sensor PCB Step 1 2 3 4 5 6 Check Is the corona wire dirty? Are the corona electrodes between the printer body and drum unit dirty? Is the problem solved when the drum unit is replaced? Are there any disconnected connectors? Are there any disconnected connectors? Are there any disconnected connectors? Result Yes No Yes No No No Remedy Clean the corona wire by using the wire cleaner. Clean both electrodes. Replace the drum unit with a new one. Replace the highvoltage power supply PCB. Replace the main PCB. Replace the panel sensor PCB. GND contacts (Fig.4-5) ➇ ➅ IV-7