Brother International HL-1070 Service Manual - Page 88

M-5 Insufficient output from high-voltage power supply unit Possible cause High-voltage contact Step Check 1 Do any of the terminals on the high-voltage contacts have dirt or contact burns? 2 Check the connection of the harness between the highvoltage power supply and the driver PCB is OK. Result Remedy Yes Clean the high-voltage contact. Yes Replace the high-voltage power supply PCB. No Reconnect the harness between the high-voltage power supply and the driver PCB. M-6 SR PCB failure Possible cause SR bias contact Ditto Step Check 1 Do any of the terminals on the SR contacts have dirt or contact burns? 2 Check the connection of the harness between the SR PCB and the driver PCB. Result Remedy Yes Clean the SR bias contact. Yes Replace the SR PCB. M-7 Fixing heater temperature failure Possible cause Poor thermistor harness contact Blown thermal fuse Thermistor failure Halogen heater lamp failure Step Check 1 Are the connectors on the erase lamp PCB and the highvoltage power supply PCB secured correctly? 2 Remove the fixing unit and measure the resistance between the input connectors. Is it open circuit? 3 Is the thermistor installed properly? 4 Remove the fixing unit and measure the resistance of the fixing unit lamp. Is it open circuit? Result Remedy No Connect the connectors securely. Yes Replace the fixing unit. Yes Replace the fixing unit. No Reinstall the thermistor properly. Yes Replace the halogen heater lamp. IV-24