• Code: 3800
• Description: AFE error
  When writing the data, read and write data does not match 3 times in succession.
• Causes: Defective ISC PWB.
• Remedy: Replace the ISC PWB and check for correct operation.

• Code: 3900
• Description: Backup memory read/write error (ISC PWB)
  Read and write data does not match.
• Causes: Defective backup memory or PWB.
• Remedy: Replace the ISC PWB and check for correct operation.

• Code: 4001
• Description: Polygon motor synchronization error
  After polygon motor is driven, the ready signal does not turn to L within 30 s.
• Causes: Defective connector cable or poor contact in the connector.
  Defective polygon motor.
  Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Polygon motor and engine PWB (YC15)
  Defective polygon motor. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 4011
• Description: Polygon motor steady-state error
  After polygon motor is stabilized, the ready signal is at the H level for 15 s continuously.
• Causes: Defective connector cable or poor contact in the connector.
  Defective polygon motor.
  Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Polygon motor and engine PWB (YC15)
  Defective polygon motor. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 4101
• Description: BD initialization error
  After polygon motor is driven, ASIC detects a BD error for 1 s.
• Causes: Defective connector cable or poor contact in the connector.
  Defective PD PWB.
  Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Laser scanner unit and LSU relay PWB (YC3) LSU relay PWB (YC2) and engine PWB (YC11)
  Defective PD PWB. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 4201
• Description: BD steady-state error
  The BD signal is not detected.
• Causes: Defective connector cable or poor contact in the connector.
  Defective PD PWB.
  Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Laser scanner unit and LSU relay PWB (YC3) LSU relay PWB (YC2) and engine PWB (YC11)
  Defective PD PWB. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 5101
• Description: Main high-voltage error
  Abnormality of charger roller is detected when Vpp adjustment.
• Causes: Defective connector cable or poor contact in the connector.
  Defective high voltage PWB
  Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. High voltage PWB (YC2) and engine PWB (YC16)
  Defective high voltage PWB. Replace the high voltage PWB and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6000
• Description: Broken fuser heater wire
  Fuser thermistor 1 does not reach 100° C/212 °F even after 30 s during warming up. The detected temperature of fuser thermistor 1 does not reach the specified temperature (ready indication temperature) for 30 s in warming up after reached to 100° C/212 °F. A temperature of less than 80°C/176 °F was observed at the fuser thermistor when the temperature at the fuser thermistor 1 reached 100°C/ 212 °F after warming up.
• Causes: Defective connector cable or poor contact in the connector.
  Deformed connector pin.
  Defective triac.
  Fuser thermostat triggered.
  Defective fuser heater.
  Defective engine PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Power source PWB (YC3) and fuser heater PWB (YC3) Fuser heater PWB (YC2) and feed PWB 1 (YC27) Feed PWB 1 (YC1) and engine PWB (YC6)
  Fuser thermostat triggered. Replace the fuser unit.
  Defective fuser heater. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.