• Code: SC547
• Description: Zero cross error
  When the main switch is turned on, the machine checks how many zero-cross signals are generated within 500 ms. This SC code is issued if the number of zero-cross signals detected is either more than 66 or less than 45 for 10 readings. Note: Zero cross signals, generated from an ac power supply, are used to generate a trigger pulses to control the applied power accurately.
• Causes: • Electrical noise on the power supply line • Fusing relay damaged: replace the PSU.

• Code: SC548
• Description: Heating roller thermistor 2 error 2: Failed to reach warmup temperature
  After the main switch is turned on or the cover is closed, the heating roller temperature does not reach the ready temperature within 2 sec. after the heater switches on. -or- If the roller was below 45°C, the heating roller did not reach the ready temperature 2 sec. after reaching 45°C. Note: Thermistor 2 stops monitoring the temperature once Thermistor 1 detects warmup temperature.
• Causes: • Thermistor is bent, installed incorrectly • Defective heating roller thermistor • Heating roller fusing lamp broken • Defective BCU

• Code: SC549
• Description: Heating roller thermistor 2 error 3: Software - High Temperature
  The thermistor detected a temperature over 250°C times within 1 sec.
• Causes: • TRIAC short • IOB defective • BICU defective • Fusing temperature control is erratic

• Code: SC550
• Description: Heating roller thermistor 2 error 4: Hardware - High Temperature
  The thermistor detected a temperature over 260°C.
• Causes: • TRIAC short • IOB defective • BICU defective • Fusing temperature control is erratic

• Code: SC551
• Description: Pressure roller thermistor error 1
  The temperature measured by the pressure roller thermistor does not reach 0°C for 200 sec.
• Causes: • Loose connection of the pressure roller thermistor • Defective pressure roller thermistor • Defective BCU

• Code: SC552
• Description: Pressure roller thermistor error 2
  After the main switch is turned on or the cover is closed, the heating roller temperature does not reach the ready temperature within 2 sec. after the heater switches on. -or- If the roller was below 45°C, the heating roller did not reach the ready temperature 2 sec. after reaching 45°C. Note: Thermistor 2 stops monitoring the temperature once Thermistor 1 detects ready temperature.
• Causes: • Pressure roller thermistor harness loose, disconnected, defective • Pressure roller thermistor defective

• Code: SC553
• Description: Pressure roller thermistor error 3: Software -High temperature
  The thermistor detected a temperature over 220°C times within 1 sec.
• Causes: • TRIAC short • IOB defective • BICU defective • Fusing temperature control is erratic

• Code: SC554
• Description: Pressure roller thermistor error 4: Hardware - High temperature
  The thermistor detected a temperature over 230°C.
• Causes: • TRIAC short • IOB defective • BICU defective • Fusing temperature control is erratic