• Code: 502
• Description: Tray 2 lift motor malfunction
  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: 503
• Description: Tray 3 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: Tray 4 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 unit)
  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 thermistor open (center)
  The fusing temperature detected by the thermistor is below 71°C and is not corrected after the main power switch is turned on.
• Causes: • Fusing thermistor defective or out of position • Power supply board defective • Loose connectors

• Code: 542
• Description: Fusing temperature warm-up error (center)
  The fusing temperature rises less than 7 degrees in 2 seconds, and this continues 5 times consecutively. The fusing temperature is not detected in 25 or 35 seconds.
• Causes: • Fusing thermistor defective or out of position • Fusing lamp open • Power supply board defective

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

• Code: 544
• Description: Fusing overheat error (center) 2
  The fusing temperature is over 250°C for 1 second (detected by the fusing temperature monitor circuit).
• Causes: • Fusing thermistor defective • Power supply board defective