• Code: 504
• Description: 4th paper tray lift motor malfunction (optional Paper Tray Unit)
  The paper lift sensor did not activate within 18 sec. after the tray lift motor switched on.
• Causes: • An obstruction (jammed paper, paper scraps, etc.) has blocked the motor drive and caused an overload. • Paper lift sensor connection loose, disconnected, or damaged • Paper lift sensor defective • Tray lift motor connection loose, disconnected, or damaged • Tray lift motor defective

• 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: • An obstruction (jammed paper, paper scraps, etc.) has blocked the motor drive and caused an overload. • Paper tray motor connection loose, disconnected, or damaged • Paper tray motor defective

• 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: • An obstruction (jammed paper, paper scraps, etc.) has jammed the rear fence or motor • Rear fence motor connection loose, disconnected, or damaged • Rear fence motor defective • Return position sensor connector loose, disconnected, or damaged • Return position sensor defective

• 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: • An obstruction (jammed paper, paper scraps, etc.) has jammed the rear fence or motor • 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: • An obstruction (jammed paper, paper scraps, etc.) has jammed the tray lift motor • 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: 541
• Description: Fusing thermistor open (center)
  The temperature of the hot roller remained below 0C for 5 sec at the center of the hot roller.
• 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 (center)
  The fusing temperature did not reach the standby temperature within 20 sec. at the center of the hot roller after the main switch turned on.
• Causes: • Fusing thermistor defective or out of position • Fusing lamp disconnected • Thermistor defective • Fusing lamp defective

• Code: 543
• Description: Fusing overheat error 1 (center)
  The fusing thermistor detected a fusing temperature over 230 °C for 5 sec. at the center of the hot roller.
• Causes: • TRIAC short on PSU (PSU defective) • BCU board defective • Fusing thermistor defective