• Code: 4101
• Description: BD initialization error(K) In case the BD signal is not detected for 1s after starting the polygon motor drive.
• Remedy: Laser scanner unit (LSU) 1. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. LSU - Main/Engine PWB (YC21) 2. If the wiring is disconnected, short-circuited or has a ground fault, replace the wire. 3. Replace the LSU.
  Main/Engine PWB 1. Check the controller firmware and engine firmware, and upgrade to the latest version. 2. Replace the main/engine PWB.

• Code: 4102
• Description: BD initialization error(C) In case the BD signal is not detected for 1s after starting the polygon motor drive.
• Remedy: Laser scanner unit (LSU) 1. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. LSU - Main/Engine PWB(YC21)If the wiring is disconnected, short-circuited or has a ground fault, replace the wire. 2. Replace the LSU.
  Main/Engine PWB 1. Check the controller firmware and engine firmware, and upgrade to the latest version. 2. Replace the main/engine PWB.

• Code: 4103
• Description: BD initialization error(M) In case the BD signal is not detected for 1s after starting the polygon motor drive.
• Remedy: Laser scanner unit (LSU) 1. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. LSU - Main/Engine PWB (YC21) 2. If the wiring is disconnected, short-circuited or has a ground fault, replace the wire. 3. Replace the LSU.
  Main/Engine PWB 1. Check the controller firmware and engine firmware, and upgrade to the latest version. 2. Replace the main/engine PWB.

• Code: 4104
• Description: BD initialization error(Y) In case the BD signal is not detected for 1s after starting the polygon motor drive.
• Remedy: Laser scanner unit (LSU) 1. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. LSU - Main/Engine PWB (YC21) 2. If the wiring is disconnected, short-circuited or has a ground fault, replace the wire. 3. Replace the LSU.
  Main/Engine PWB 1. Check the controller firmware and engine firmware, and upgrade to the latest version. 2. Replace the main/engine PWB.

• Code: 4600
• Description: LSU cleaning motor error Over-current is detected for 5s during the LSU cleaning motor drive
• Remedy: Cleaning wire 1. Execute [LSU cleaning] using [Adjustment/Maintenance] of the system menu. 2. Check that the drive gear and cleaning spiral can rotate and they are not unusually loaded, and if necessary, clean and grease.
  Cleaning motor 1. Confirm that the cleaning motor has been firmly attached. 2. Replace the LSU.
  Main/Engine PWB 1. Reconnect the connector if its connection is loose. 2. If a wire is pinched by another component, or has defective conduction, replace it. Cleaning motor - container relay PWB (YC13) 3. Replace the main/engine PWB.

• Code: 4700
• Description: error Communication with the video ASIC has failed 5 times successively. After writing to the VIDEO ASIC, the error that the reading value from the same address does not match occurs 8 times successively.
• Remedy: Main/Engine PWB 1. Unplug the power cord from the wall outlet, and wait five seconds. Then plug in the power cord and then turn on the power switch. 2. Check that the connectors on the main/engine PWB are properly connected, and if not, re-connect them. 3. Replace the main/engine PWB.
  High voltage PWB 1. Check if the main charger roller contact on the high voltage PWB is deformed or dirty. 2. Replace the high voltage PWB.
  Main/Engine PWB Replace the main/engine PWB.

• Code: 6000
• Description: Broken fuser heater wire During warm up, the temperature detected by the thermistor does not reach 100 °C/212.0 °F for 20 s. During warm up, the temperature detected by the thermistor does not reach the stable display temperature for 40 s, after it reaches 100 °C/212.0 °F.
• Remedy: Fuser unit 1. Make sure there is no paper jam. 2. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Fuser unit - Main/Engine PWB(YC23) 3. If the wiring is disconnected, short-circuited or has a ground fault, replace the wire. 4. If the fuser heater is not turned on (broken thermostat wire), replace the fuser unit.
  Low voltage power supply PWB 1. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Low voltage power supply PWB - Maine/Engine PWB(YC1)Replace the main/engine PWB.
  Main/Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Replace the main/engine PWB.

• Code: 6020
• Description: Fuser thermistor High temperature error The temperature detected by the thermistor (edge) exceeded 220 °C/428.0 °F for 1s in succession.
• Remedy: Fuser unit 1. Make sure there is no paper jam. 2. Check if the fuser roller has foreign objects such as the toner contamination. 3. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Fuser unit - Main/Engine PWB(YC23) 4. If the wiring is disconnected, short-circuited or has a ground fault, replace the wire. 5. Replace the fuser unit.
  Low voltage power supply PWB 1. Confirm that the wiring connector is firmly connected, and if necessary, connect the connector all the way in. Low voltage power supply PWB - Maine/Engine PWB(YC23)If the fuser heater is turned on at all times, replace the low voltage power supply PWB.
  Main/Engine PWB 1. Check the engine firmware and upgrade to the latest version if necessary. 2. Check if the main/engine PWB is properly secured with screws. 3. Replace the main/engine PWB.