Brother International HL-1660E Service Manual - Page 93

M-14 "50 FUSER MALF" is displayed Possible cause Step Check Result Remedy Thermal fuse 1 Is the thermal fuse located in the fixing unit conductive? No Replace the fixing unit. Thermistor Fixing heat roller 2 Remove the fixing unit from the printer and measure the resistance between two pins of the 2 pin connector on the fixing PCB. Is the measured resistance within the range of 1.0 M 1.6M (normal temperature)? 3 Is the fixing heat roller located in the fixing unit conductive? No Replace the fixing unit. No Replace the fixing heat roller. Low-voltage power supply PCB 4 When the power is switched on, does the voltage at connector pin P4-1 on the main PCB go from 5V to 0V? Yes Replace the low-voltage power supply PCB assy. Main PCB 5 Make sure if: No Replace the main PCB assy. The EP-ED cartridge is installed in the printer correctly. The upper cover of the printer is closed. A paper-loaded cassette is mounted. Note: When the printer has detected a fixing unit malfunction, do not power on for about 15 minutes. Even if the power is on, the printer will shut off the power supply to the fixing heat roller to prevent the fixing the unit from overheating. M-15 "51 LASER BD MALF" is displayed Possible cause Step Check Result Remedy Main PCB 1 Is the problem remedied when the power off No Replace the main PCB assy , Scanner harness and on again? the SCN harness 4P,SCN flat cable 6P or the scanner unit. M-16 "52 SCANNER MALF" is displayed Possible cause Step Check Result Remedy Main PCB 1 Is the problem remedied when the power off No Replace the main PCB assy, Scanner harness and on again? the SCN harness 4P, SCN flat Scanner unit cable 6P or the scanner unit. VI - 17