• Code: 402
• Description: Transfer roller leak error 2
  A current leak signal for the transfer roller is detected. A current feedback signal for the transfer roller is not detected.
• Causes: • High voltage supply board defective • Poor connection of the PCU • Transfer/separation unit set incorrectly • Transfer roller damaged

• Code: 500
• Description: Main motor lock
  A main motor lock signal is not detected for more than 7 consecutive checks (700 ms) after the main motor starts to rotate, or the lock signal is not detected for more than 7 consecutive checks during rotation after the last signal.
• Causes: • Too much load on the drive mechanism • Main motor defective

• Code: 503
• Description: Upper paper tray lift motor malfunction (optional paper tray units)
  The paper lift sensor fails to activate twice continuously after the tray lift motor has been on for 18 seconds.
• Causes: • Paper lift sensor defective • Tray lift motor defective • Too much load on the drive mechanism • Poor tray lift motor connection

• Code: 504
• Description: Lower paper tray lift motor malfunction (optional two-tray paper tray unit)
  The paper lift sensor fails to activate twice continuously after the tray lift motor has been on for 18 seconds.
• Causes: • Paper lift sensor defective • Tray lift motor defective • Too much load on the drive mechanism • Poor tray lift motor connection

• Code: 506
• Description: Paper feed motor lock (optional paper tray units)
  A motor lock signal is not detected for more than 1.5 s or the lock signal is not detected for more than 1.0 s during rotation.
• Causes: • Paper feed motor defective • Too much load on the drive mechanism

• Code: 541
• Description: Fusing thermostat/thermistor open
  The fusing temperature detected by the thermistor is below 10°C for 5 seconds after the main power switch is turned on.
• Causes: • Fusing thermostat defective or out of position • Fusing thermistor defective or out of position • Power supply board defective

• Code: 542
• Description: Fusing temperature warm-up error
  The fusing temperature does not reach 80°C within 30 seconds after the main switch is turned on.
• Causes: • Fusing thermistor defective or out of position • Fusing lamp open • Fusing thermostat open • Fusing thermofuse open • Power supply board defective

• Code: 543
• Description: Fusing overheat error
  A fusing temperature of over 230°C is detected for 1 second by the fusing thermistor.
• Causes: • Fusing thermistor defective • Power supply board defective