Brother International HL 5030 Service Manual - Page 207
Completely blank, connected securely?
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I-3 Completely blank HL-5030/5040/5050/5070N SERVICE MANUAL Possible cause Developing bias contact failure Drum unit Drum unit failure Toner cartridge failure Scanner harness connection failure Main PCB failure Laser unit failure Step 1 2 3 4 5 6 7 Check Are the developing bias contacts between the printer body and drum unit dirty? Are the drum shaft and drum electrode of the printer body connected correctly? Is the problem solved after replacing the drum unit? Is the problem solved after replacing the toner cartridge? Is the scanner harness connected securely? (Check if there is any play in the connection.) Are printing signals being input to the laser unit? Is the problem solved after replacing the main PCB? Is the scanner interlock lever damaged? Is the scanner mirror broken or loose? Result Yes Yes No Yes Yes No Yes Yes No Remedy Clean the electrodes at both sides. Clean the shaft and the electrode. Check the connection between the shaft and the electrode. Replace the drum unit. Replace the toner cartridge with a new one. Reconnect the connector correctly. Replace the main PCB. Replace the laser unit. Replace the highvoltage power supply PCB. Ground contacts (4) (1) (1) 6-27