Brother International HL 1030 Service Manual - Page 148

CHAPTER 6 TROUBLESHOOTING I-3 Completely blank Possible cause Developing bias contact failure Step 1 Drum unit 2 Drum unit failure 3 Toner cartridge 4 failure Scanner 5 harness connection failure Main PCB failure 6 Laser unit failure 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 Remedy Yes Clean the electrodes at both sides. Yes Clean the shaft and the electrode. No Check the connection between the shaft and the electrode. Yes Replace the drum unit. Yes Replace the toner cartridge with a new one. No Reconnect the connector correctly. Yes Replace the main PCB. Yes Replace the laser unit. No Replace the highvoltage power supply PCB. Ground contacts ➃ ➀ ➀ 6-26