Brother International DCP 8080DN Service Manual - Page 121
Completely blank, Image distortion
UPC - 012502622697
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■ Completely blank - Replace the drum unit with a new one. - Replace the toner cartridge with a new one. Step 1 2 3 4 5 Cause Check Developing bias voltage conduction failure Are the electrodes on the drum unit and machine body dirty? Scanner harness of the laser unit connection failure Is the scanner harness of the laser unit connected securely? Laser unit failure Is the problem solved after replacing the laser unit? HVPS PCB failure Is the problem solved after replacing the HVPS PCB ASSY? Main PCB failure Is the problem solved after replacing the main PCB ASSY? Result Remedy Clean both electrodes. Yes (Refer to Fig. 3-2, Fig. 3-3.) Reconnect the scanner No harness of the laser unit. Replace the laser unit. Yes Replace the HVPS PCB Yes ASSY. Replace the main PCB Yes ASSY. ■ Image distortion Step 1 2 3 Cause Check Laser unit not assembled correctly Is the laser unit assembled into the machine securely? (Check if there is no gap.) Incorrect radiation angle of scanner diode of laser unit. Scanner motor rotation failure Is the problem solved after replacing the laser unit? Main PCB failure Is the problem solved after replacing the main PCB ASSY? Result Remedy Assemble the laser unit correctly and secure the No screw. Replace the laser unit. Yes Replace the main PCB Yes ASSY. 3-49 Confidential