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

• Code: 501
• Description: 1st paper tray lift motor malfunction
• Causes: • Paper lift sensor defective • Tray lift motor defective • Too much load on the drive mechanism • Poor tray lift motor connection

• Code: 502
• Description: 2nd paper tray lift motor malfunction
• Causes: • Paper lift sensor defective • Tray lift motor defective • Too much load on the drive mechanism • Poor tray lift motor connection

• Code: 503
• Description: 3rd paper tray lift motor malfunction (optional paper tray unit)
• Causes: • Paper lift sensor defective • Tray lift motor defective • Too much load on the drive mechanism • Poor tray lift motor connection

• Code: 504
• Description: 4th paper tray lift motor malfunction (optional paper tray unit)
• 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 tray 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 tray unit motor defective • Too much load on the drive mechanism

• Code: 508
• Description: Rear fence drive error (optional LCT)
  The return position sensor is not activated after the rear fence drive motor has been on to lower the tandem tray for 8 seconds.
• Causes: • Rear fence motor defective • Return position sensor defective • Too much load on the drive mechanism

• Code: 509
• Description: Side fence drive error (optional LCT)
  The side fence positioning sensor is not activated for more 3 seconds when the paper stack in the left tray is moved to the right tray. The side fence close sensor is not activated for more 3 seconds after moving the paper stack to the right tray.
• Causes: • Side fence motor defective • Side fence position sensor defective • Side fence close sensor defective • Too much load on the drive mechanism