• 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
  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 high-voltage board).
• Causes: Defective connector cable or poor contact in the connector.
  Defective high voltage PWB
  Defective engine PWB.
• Remedy: Improper installation charger roller unit. Reinstall the charger roller unit.
  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 IH PWB (YC1) Fuser IH PWB (YC4) and engine PWB (YC26)
  Fuser thermostat triggered. Replace the fuser unit.
  Defective fuser IH. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6020
• Description: Abnormally high fuser thermistor 1 temperature
  Fuser thermistor 1 detects a temperature higher than 240°C/464°F for 1 s.
• Causes: Deformed connector pin.
  Defective triac.
  Shorted fuser thermistor 1.
  Defective engine PWB.
• Remedy: Shorted fuser thermistor 1. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6030
• Description: Broken fuser thermistor 1 wire
  Input from fuser thermistor 1 is 984 or more (A/D value) continuously for 1 s. Except, the A/D value in the differential output won’t change by 4 or more when it was turned on for 10 seconds in a low-temperature environment.
• Causes: Defective connector cable or poor contact in the connector.
  Deformed connector pin.
  Defective triac.
  Broken fuser thermistor 1 wire.
  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. Fuser unit and engine PWB (YC26)
  Broken fuser thermistor 1 wire. Replace the fuser unit.
  Fuser thermostat triggered. Replace the fuser unit.
  Defective fuser IH. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6040
• Description: Fuser heater error
  Input from fuser thermistor 1 is abnormal value continuously for 1 s.
• Causes: Defective connector cable or poor contact in the connector.
  Deformed connector pin.
  Defective triac.
  Broken fuser thermistor 1 wire.
  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. Fuser unit and engine PWB (YC26)
  Broken fuser thermistor 1 wire. Replace the fuser unit.
  Defective fuser IH. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6050
• Description: Abnormally low fuser thermistor 1 temperature
  Fuser thermistor 1 detects a temperature lower than 100°C/212°F for 1 s after warming up.
• Causes: Deformed connector pin.
  Defective triac.
  Defective fuser thermistor 1.
  Defective fuser heater.
  Defective engine PWB.
• Remedy: Defective fuser thermistor 1. Replace the fuser unit.
  Defective fuser IH. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6100
• Description: Broken fuser heater wire
  Fuser thermistor 5 won’t reach the reference temperature in 480 s after shifting to low power mode.
• Causes: Defective connector cable or poor contact in the connector.
  Deformed connector pin.
  Defective triac.
  Broken fuser thermistor 5 wire.
  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. Fuser unit and engine PWB (YC26)
  Broken fuser thermistor 5 wire. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.