Description: Fusing cooling fan error The motor lock signal error from the fusing cooling fan is detected for 10 seconds after turning on the fusing cooling fan.
Causes: • Disconnected harness of the fusing cooling fan • Defective fusing cooling fan • Defective BCU
Remedy: 1. Check or replace the harness of the fusing cooling fan. 2. Replace the fusing cooling fan. 3. Replace the BCU.
Code: 540
Description: Fusing/Paper exit motor error The BCU receives the lock signal 2.0 seconds after turning on the fusing/paper exit motor.
Causes: • Motor overload • Defective fusing/paper exit motor • Defective or disconnected connection for the fusing/paper exit motor
Remedy: 1. Replace the fusing/paper exit motor. 2. Check or replace connector and harness for the fusing/paper exit motor.
Code: 541
Description: Heating roller thermopile error The temperature measured by the heating roller thermopile does not reach 0°C for 6 seconds.
Causes: • Loose connection of the heating roller thermopile • Defective heating roller thermopile • Defective thermopile
Remedy: 1. Check if the heating roller thermopile is firmly connected. 2. Replace the heating roller thermopile.
Code: 542
Description: Heating roller warm-up error 1 • After the main switch is turned on or the cover is closed, the increment of the heating roller temperature per 10 seconds is 30°C or less. If this condition is detected five times consecutively, SC 542 is defined. • The heating roller temperature does not reach 100°C for 15 seconds after the heating lamp on. • The heating roller temperature does not reach the ready temperature while 60 seconds after the heating lamp on. • The center temperature of the heating roller does not reach the ready temperature for 30 seconds after the edge temperature of the heating roller has reached the ready temperature.
Causes: • Dirty or defective thermopile • Defective thermopile. • Trash on the surface of the thermopile lens. • Defected thermistor. • Input voltage is over guaranteed value • Defective heating roller lamp
Remedy: 1. Check if the thermopile is firmly connected. 2. Clean the surface of the thermopile lens. 3. Test the conductance for the thermopile and the heating roller 4. Replace the thermopile. 5. Replace the heating roller lamp.
Code: 543
Description: Heating roller fusing lamp overheat 1 (software error) The detected fusing temperature stays at 245°C for 1 second.
Causes: • Defective PSU • Defective BCU
Remedy: 1. Replace the PSU. 2. Replace the BCU.
Code: 544
Description: Heating roller fusing lamp overheat 1 (hardware error) During stand-by mode or a print job, the detected heating roller temperature reaches 250 °C.
Causes: • Defective PSU • Defective BCU • Defective heating roller thermistor (end) • Defective fusing control system
Remedy: 1. Replace the PSU. 2. Replace the BCU. 3. Replace the heating roller thermistor (end).