Brother International DCP 8040 Service Manual - Page 241
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UPC - 012502610328
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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 machine 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 CCD unit 5 Is the problem solved after replacing the high-voltage power supply PCB? 6 Is the problem solved after replacing the main PCB? 7 Is the problem occurring on CCD replacement? Result Yes Yes Yes Remedy Clean the corona wire with the wire cleaner. Replace the drum unit. 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. Yes Replace the CCD. 6-38