• Code: 4104
• Description: BD initialization error Y After polygon motor Y is driven, the BD signal is not detected for 1 s.
• Remedy: PD PWB Y (LSU) 1. Confirm that the FFC wiring connector is not distorted and connect the FFC wiring all the way in. Laser scanner unit and LSU relay PWB (YC12) LSU relay PWB (YC3) and Engine PWB (YC12) 2. If the FFC wiring is disconnected, replace the FFC wiring. 3. Replace the laser scanner unit.
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 4201
• Description: BD steady-state error K The BD signal is not detected.
• Remedy: PD PWB K (LSU) 1. Confirm that the FFC wiring connector is not distorted and connect the FFC wiring all the way in. Laser scanner unit and LSU relay PWB (YC5) LSU relay PWB (YC3) and Engine PWB (YC12) 2. If the FFC wiring is disconnected, shorted or grounded, replace the FFC wiring. 3. Replace the laser scanner unit.
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 4202
• Description: BD steady-state error C The BD signal is not detected.
• Remedy: PD PWB C (LSU) 1. Confirm that the FFC wiring connector is not distorted and connect the FFC wiring all the way in. Laser scanner unit and LSU relay PWB (YC10) LSU relay PWB (YC3) and Engine PWB (YC12) 2. If the FFC wiring is disconnected, replace the FFC wiring. 3. Replace the laser scanner unit.
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 4203
• Description: BD steady-state error M The BD signal is not detected.
• Remedy: PD PWB M (LSU) 1. Confirm that the FFC wiring connector is not distorted and connect the FFC wiring all the way in. Laser scanner unit and LSU relay PWB (YC8) LSU relay PWB (YC3) and Engine PWB (YC12) 2. If the FFC wiring is disconnected, replace the FFC wiring. 3. Replace the laser scanner unit.
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 4204
• Description: BD steady-state error Y The BD signal is not detected.
• Remedy: PD PWB Y (LSU) 1. Confirm that the FFC wiring connector is not distorted and connect the FFC wiring all the way in. Laser scanner unit and LSU relay PWB (YC12) LSU relay PWB (YC3) and Engine PWB (YC12) 2. If the FFC wiring is disconnected, replace the FFC wiring. 3. Replace the laser scanner unit.
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 4300
• Description: Polygon motor phase error ASIC won’t settle in completion of phase adjustment for 2 s after a BD signal is detected.
• Remedy: Laser scanner unit Replace the laser scanner unit.
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 4600
• Description: LSU cleaning motor error After LSU cleaning motor is driven, the ready signal does not turn to L within 2 s. After LSU cleaning motor is stabilized, the ready signal is at the H level for 1 s continuously.
• Remedy: LSU cleaning motor 1. Execute LSU cleaning using Adjustment/Maintenance of the system menu. 2. Rotate the drive gear and the cleaning spiral by the hand and check that they are not unusually loaded, and replace if it is damaged. 3. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. LSU cleaning motor and Engine PWB (YC21) 4. If the wiring is disconnected, shorted or grounded, replace the wiring. 5. Replace the LSU cleaning motor.
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 5101
• Description: Main high-voltage error K Measure the inflowing current when Vpp is varied in 3 steps and verify if the difference of the currents of 0 and step 2 is less than 42 (51 if lower highvoltage board).
• Remedy: Drum unit 1. Execute U030 Belt Mean Drum Motor and check that the drum motor can rotate. 2. Confirm that the drum or the drum screw can rotate. 3. Check that the discharger lamp is properly connected. 4. If it won’t rotate, replace the drum unit.
  Charger roller unit 1. Check that the high-voltage contacts are not distorted or adhered with foreign objects. 2. Reinstall the chrager roller unit.Or, replace the charger roller unit.
  High voltage PWB 1 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. High voltage PWB 1(YC4) and Engine PWB (YC17) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the High voltage PWB 1.
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.