• 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 connection loose, disconnected, or damaged • Paper lift sensor defective • Tray lift motor connection loose, disconnected, or damaged • Tray lift motor defective • Obstruction that causes overload on the drive mechanism

• 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 motor connection loose, disconnected, or damaged • Paper tray motor defective • Obstruction that causes overload on the drive mechanism

• Code: 508
• Description: LCT rear fence drive error
  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 connection loose, disconnected, or damaged • Rear fence motor defective • Return position sensor connector loose, disconnected, or damaged • Return position sensor defective • Obstruction that causes overload on the drive mechanism

• Code: 509
• Description: LCT side fence drive error
  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: • Obstruction that causes overload on the drive mechanism • Side fence motor disconnected or defective • Side fence position sensor disconnected or defective• Side fence close sensor disconnected or defective

• 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 disconnected or defective • Obstruction that causes overload 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 • Obstruction that causes overload on the drive mechanism

• Code: 541
• Description: Fusing thermistor open
  The fusing temperature did not increase 12 °C at the center or ends of the hot roller within 2 seconds after two checks from the time the fusing lamps turned on.
• Causes: • Fusing thermistor out of its position because of incorrect installation • Fusing thermistor disconnected or defective • Power supply not within rated range (15% or more below rating)

• 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 disconnected • Fusing thermostat open