• Code: 541
• Description: Fusing thermistor open
  The fusing temperature detected by the thermistor was below 0 °C for 5 seconds. The fusing temperature does not rise +15 °C (center) or +12 °C (at the ends) five times within 2 minutes after the fusing lamps have been turned on.
• Causes: • Fusing thermistor defective or out of position • Fusing lamp open • Fusing thermostat open • Power supply board defective • Poor connection of the fusing unit

• Code: 542
• Description: Fusing temperature warm-up error
  The fusing temperature does not reach the standby temperature within 20 seconds after the main switch is turned on.
• Causes: • Fusing thermistor defective or out of position • Fusing lamp open • Fusing thermostat open • Power supply board defective • Poor connection of the fusing unit

• Code: 543
• Description: Fusing overheat error 1
  A fusing temperature of over 231°C is detected for 5 second by the fusing thermistor.
• Causes: • Fusing thermistor defective • Power supply board defective • SBCU board defective

• Code: 544
• Description: Fusing overheat error 2
  A fusing temperature of over 251°C is detected by the fusing temperature monitor circuit in the SBCU board.
• Causes: • Fusing thermistor defective • Power supply board defective • SBCU board defective

• Code: 546
• Description: Unstable fusing temperature
  The fusing temperature varies 50°C or more within 1 second twice continuously.
• Causes: • Thermistor defective • Poor connection of the fusing unit • Power supply unit defective

• Code: 547
• Description: Zero cross signal malfunction
  Zero cross signals are not detected within a certain period.
• Causes: • Power supply board defective • SBCU board defective

• Code: 548
• Description: Fusing unit set error
  The machine does not detect the fusing unit.
• Causes: • Poor connection of the fusing unit • The fusing unit is not installed

• Code: 590
• Description: Exhaust fan motor error
  The CPU detects an exhaust fan lock signal for more than 5 seconds.
• Causes: • Poor connection of the exhaust fan motor • Too much load on the motor drive