Brother International DCP 8040 Service Manual - Page 229

CHAPTER 6 TROUBLESHOOTING M-9 Fixing Unit failure Possible cause Poor thermistor harness contact Blown thermal fuse Thermistor failure Halogen heater lamp failure Heater harness connection failure Step 1 2 3 Check Is the contact of connector CN7 on the engine PCB good? Remove the fixing unit and measure the resistance between the input connectors. Is it open circuit? Is the thermistor installed properly? 4 Remove the fixing unit and measure the resistance of the halogen heater lamp. Is it open circuit? 5 Is the heater harness connector connected to the low-voltage power supply PCB and fixing unit secure? Result Remedy No Reconnect the connector. Yes Replace the fixing unit. Yes Replace the fixing unit. No Reinstall the thermistor properly. Yes Replace the halogen heater lamp. No Reconnect the connectors securely. NOTE: • This problem will be cleared if leaving the printer power ON for ten minutes. • If the heater is cooled down sufficiently, this problem may be cleared by enter the maintenance mode after press 9 key twice. Be warned, however, that this operation will melt the fixing unit if the heater is hot. M-10 Main PCB failure Possible cause Main PCB Software bug Step 1 2 Check Is it possible to copy? Does this problem appear when printing specific data or printing under a specific environment? Result No Yes Remedy Replace the main PCB. Inform the Brother office of the used specific data, machine condition and system environment. 6-26