• Code: 460
• Description: Separation power pack output error
  An interrupt checks the status of the power pack every 20 ms. This SC is issued if the BCU detects a short in the power pack 10 times at D(ac).
• Causes: • Damaged insulation on the high-voltage supply cable • Damaged insulation around the high-voltage power supply.
• Remedy: 1. Replace the high-voltage supply cable. 2. Replace the high-voltage power supply unit. 3. Replace the IOB.

• Code: 490
• Description: Toner transport motor error
  The LOCK signal is not detected for 2 seconds when the transport motor turns on.
• Causes: • Toner transport motor overload • Disconnected or broken harness • Defective toner transport motor • Opened +24V fuse on the PSU • Defective interlock switch
• Remedy: 1. Check or replace the harness. 2. Replace the toner transport motor. 3. Replace the +24V fuse on the PSU. 4. Replace the interlock switch.

• Code: 491
• Description: High voltage power: Drum/ development bias output error
  An error signal is detected for 0.2 seconds when charging the drum or development.
• Causes: • High voltage leak • Broken harness • Defective drum unit or development unit • Defective high voltage supply unit
• Remedy: 1. Check or replace the harness. 2. Replace the drum unit or paper transfer unit. 3. Replace the high voltage supply unit.

• Code: 492
• Description: High voltage power: Image transfer/ paper transfer bias output error
  An error signal is detected for 0.2 seconds when charging the separation, image transfer bet or paper transfer roller.
• Causes: • High voltage leak • Broken harness • Defective image transfer belt unit or paper transfer unit • Defective high voltage supply unit
• Remedy: 1. Check or replace the harness. 2. Replace the image transfer belt unit or paper transfer unit. 3. Replace the high voltage supply unit.

• Code: 498
• Description: Temperature and humidity sensor error 2
  • The thermistor output of the temperature sensor was not within the prescribed range (more than 0.5 V to less than 3.0 V). • The thermistor output of the humidity sensor was not within the prescribed range (less than 2.4V).
• Causes: • Temperature and humidity sensor harness disconnected, loose, defective • Temperature and humidity sensor defective
• Remedy: 1. Check the connector and harness. 2. Replace the temperature/humidity sensor.

• Code: 501
• Description: Paper Tray 1 error
  • When the tray lift motor rotates counterclockwise, (if the upper limit is not detected within 10 seconds), the machine asks the user to reset the tray. • When the tray lift motor rotates clockwise, (if the upper limit is not detected within 1.5 seconds), the machine asks the user to reset the tray. If one of these conditions occurs three consecutive times, the SC is generated.
• Causes: • Disconnected or defective paper lift sensor • Disconnected or defective tray lift motor • Defective bottom plate lift mechanism • Too much paper in the tray • Defective IOB
• Remedy: 1. Check if the paper is not loaded too much. 2. Check if the bottom plate smoothly moves up and down manually. 3. Check and / or replace the tray lift motor / paper lift sensor. 4. Replace the IOB.

• Code: 502
• Description: Paper Tray 2 error
  • When the tray lift motor rotates counterclockwise, (if the upper limit is not detected within 10 seconds), the machine asks the user to reset the tray. • When the tray lift motor rotates clockwise, (if the upper limit is not detected within 1.5 seconds), the machine asks the user to reset the tray. If one of these conditions occurs three consecutive times, the SC is generated.
• Causes: • Disconnected or defective paper lift sensor • Disconnected or defective tray lift motor • Defective bottom plate lift mechanism • Too much paper in the tray • Defective IOB
• Remedy: 1. Check if the paper is not loaded too much. 2. Check if the bottom plate smoothly moves up and down manually. 3. Check and / or replace the tray lift motor / paper lift sensor. 4. Replace the IOB.

• Code: 503
• Description: Tray 3 error (Paper Feed Unit or LCT)
  This SC is generated if the following condition occurs. For the paper feed unit: When the tray lift motor is turned on, the upper limit is not detected within 15 seconds For the LCT: The upper or lower limit is not detected within 8 seconds when the tray lift motor is turned on to lift or lower the tray. This SC is generated too if the following condition occurs 3 consecutive times. For the paper feed unit: When the tray lowers, the tray lift sensor does not go off within 1.5 sec. For the LCT: When the main switch is turned on or when the LCT is set, if the end fence is not in the home position (home position sensor ON), the tray lift motor stops. If the upper limit does not go off for 1.5 seconds even the tray lift motor turns on to lower the tray after the upper limit has been detected at power on.
• Causes: For the paper feed unit: • Defective tray lift motor or connector disconnection • Defective lift sensor or connector disconnection For the LCT: • Defective stack transport clutch or connector disconnection • Defective tray motor or connector disconnection • Defective end fence home position sensor or connector disconnection • Defective upper limit sensor or connector disconnection • Defective tray lift motor or connector disconnection
• Remedy: 1. Check the cable connections. 2. Check and/or replace the defective component.