• Code: 4011
• Description: Polygon motor steady-state error
  After Polygon motor is stabilized, the ready signal is at the H level for 1 s continuously.
• Causes: Polygon motor (LSU). Engine PWB.
• Remedy: Polygon motor (LSU) 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Polygon motor and Engine PWB (YC28) 2. If the wiring is disconnected, shorted or grounded, replace the 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: 4101
• Description: BD initialization error
  After Polygon motor is driven, the BD signal is not detected for 1 s.
• Causes: PD PWB (LSU). Engine PWB.
• Remedy: PD PWB (LSU) 1. Confirm that the FCC wiring connector is not distorted and connect the FCC wiring all the way in. BD PWB and APC PWB (YC2) APC PWB (YC1) and Engine PWB (YC27) 2. If the FCC wiring is disconnected, replace the FCC 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
  The BD signal is not detected.
• Causes: PD PWB (LSU). Engine PWB.
• Remedy: PD PWB (LSU) 1. Confirm that the FCC wiring connector is not distorted and connect the FCC wiring all the way in. BD PWB and APC PWB (YC2) APC PWB (YC1) and Engine PWB (YC27) 2. If the FCC wiring is disconnected, shorted or grounded, replace the FCC 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: 5101
• Description: Main high-voltage error
  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 5.
• Causes: Drum unit. Charger roller unit PWB). High voltage PWB. Engine PWB.
• Remedy: Drum unit 1. Confirm that the drum or the drum screw can rotate. 2. If it won’t rotate, replace the drum unit. 3. Check that the discharger lamp is properly connected.
  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. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. High voltage PWB (CN1) and Engine PWB (YC31) 2. If the FCC wiring is disconnected, shorted or grounded, replace the FCC wiring. 3. Replace the High voltage PWB.
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 6020
• Description: Abnormally high fuser thermistor 2 temperature
  Input from fuser thermistor 2 is abnormal value continuously for 1 s.
• Causes: Fuser unit. Fuser thermistor 2. Engine PWB.
• Remedy: Fuser unit 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Fuser thermistor 2 and Fuser PWB (YC2) Fuse PWB and Engine PWB (YC22) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. If the I/F connector pins of the fuser unit and the main unit are deformed owing to foreign matters, such as paper dusts, replace the connectors or the units including the connectors.
  Fuser thermistor 2 Replace the Fuser unit.
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 6030
• Description: Broken fuser thermistor 2 wire
  A/D value of the fuser thermistor 2 exceeds 251 bit continuously for 5.6 s during warming up.
• Causes: Fuser unit. Fuser thermistor 2. Engine PWB.
• Remedy: Fuser unit 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Fuser thermistor 2 and Fuser PWB (YC2) Fuse PWB and Engine PWB (YC22) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. If the I/F connector pins of the fuser unit and the main unit are deformed owing to foreign matters, such as paper dusts, replace the connectors or the units including the connectors.
  Fuser thermistor 2 Replace the Fuser unit.
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 6200
• Description: Broken fuser edge heater wire
  Even if 60 seconds pass after a warm-up start, when it will not be in a stable state. When the difference in temperature 5.6 seconds and 16 seconds after heater lighting is less than 43 °C. Even if 8 seconds pass during test mode operation, when change of AD is less than three.
• Causes: Fuser unit. Fuser thermostat. Fuser heater. Powe source PWB. Engine PWB.
• Remedy: Fuser unit 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Power source PWB (YC6) and Engine PWB (YC24) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. If the I/F connector pins of the fuser unit and the main unit are deformed owing to foreign matters, such as paper dusts, replace the connectors or the units including the connectors.
  Fuser thermostat. Fuser heater. Replace the Fuser unit.
  Powe source PWB Replace the power source PWB.
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 6220
• Description: Abnormally high fuser edge thermistor temperature
  Input from fuser thermistor 1 is abnormal value continuously for 1 s.
• Causes: Fuser unit. Fuser thermistor 1. Engine PWB.
• Remedy: Fuser unit 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Fuser thermistor 1 and Fuser PWB (YC2) Fuser PWB and Engine PWB (YC22) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. If the I/F connector pins of the fuser unit and the main unit are deformed owing to foreign matters, such as paper dusts, replace the connectors or the units including the connectors.
  Fuser thermistor 1 Replace the Fuser unit.
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.