• Code: SC541
• Description: Heating roller thermistor error The temperature measured by the heating roller thermistor does not reach 7 °C for ten seconds.
• Causes: • Loose connection of the heating roller thermistor • Defective heating roller thermistor • Defective BCU
• Remedy: 1. Check if the heating roller thermistor is firmly connected. 2. Replace the fusing unit. 3. Replace the BCU.

• Code: SC542
• Description: Heating roller warm-up error After the main switch is turned on or the cover is closed, the heating roller temperature does not reach the ready temperature within 60 seconds during fusing unit warm-up.
• Causes: • Heating roller fusing lamp broken • Defective heating roller thermistor • Defective BCU
• Remedy: 1. Check if the heating roller thermistor is firmly connected. 2. Replace the fusing unit. 3. Replace the BCU.

• Code: SC543
• Description: Heating roller fusing lamp overheat The detected fusing temperature stays at 200°C or more for five seconds.
• Causes: • Defective PSU • Defective BCU
• Remedy: 1. Replace the PSU. 2. Replace the BCU.

• Code: SC544
• Description: Heating roller fusing lamp low temperature error During stand-by mode or a print job, the detected heating roller temperature stays at 50 °C or less for five seconds.
• Causes: • Loose connection between the fusing unit and the main frame • Defective heating roller thermistor • Defective PSU • Defective BCU
• Remedy: 1. Check the connection between the fusing unit and main frame. 2. Replace the fusing unit. 3. Replace the PSU. 4. Replace the BCU.

• Code: SC545
• Description: Heating roller fusing lamp consecutive full power When the fusing unit is not running in the Ready condition, the heating roller fusing lamp keeps on with full power for 30 consecutive seconds.
• Causes: • Heating roller thermistor out of position
• Remedy: 1. Replace the fusing unit.

• Code: SC546
• Description: Heating roller fusing lamp temperature fluctuation The heating roller temperature changes by ±20°C or more in one second. This occurs three times in one minute or two consecutive times.
• Causes: • Loose connection of the thermistor • Loose connection between the fusing unit and main frame
• Remedy: 1. Check if the fusing unit is properly set and connected to the main frame. 2. Check if the heating roller thermistor connector is firmly connected. 3. Replace the fusing unit.

• Code: SC551
• Description: Pressure roller thermistor error The measured pressure roller temperature does not reach 7°C for 30 seconds.
• Causes: • Loose connection of pressure roller thermistor • Defective pressure roller thermistor • Defective BCU
• Remedy: 1. Check that the pressure roller thermistor is firmly connected. 2. Replace the fusing unit. 3. Replace the BCU.

• Code: SC552
• Description: Pressure roller warm-up error After the main switch is turned on or the door is closed, the pressure roller temperature does not reach the ready temperature within 150 seconds during fusing unit warm-up.
• Causes: • Pressure roller fusing lamp broken • Defective pressure roller thermistor • Defective BCU
• Remedy: 1. Check if the pressure roller thermistor is firmly connected. 2. Replace the fusing unit. 3. Replace the BCU.