• 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)
  The paper lift sensor is not activated 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 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

• Code: 510
• Description: LCT lower limit error
  The lower limit sensor does not activate within 8 seconds after the tray has been lowered.
• Causes: • Tray lift motor defective • Poor connection of the tray lift motor • Lower limit sensor defective • Too much load on the drive mechanism

• Code: 520
• Description: Paper tray error
  An error occurs (i.e motor error, or sensor error, etc) for any paper tray.
• Causes: • A defective motor • A defective sensor • Too much load on the drive mechanism