• Code: 6200
• Description: Broken fuser edge heater wire
  Fuser thermistor 1 does not reach 50° C/122 °F even after20 s during warming up. The detected temperature of fuser thermistor1 does not reach the specified temperature (ready indication temperature) for 60 s in warming up after reaching 50° C/122 °F.
• Causes: Defective connector cable or poor contact in the connector. Deformed connector pin. Fuser thermostat triggered. Broken fuser heater 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. IH coil unit and IHPWB IHPWB and engine PWB (YC7)
  Deformed connector pin. 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 triggered. Broken fuser heater wire. Reinsert the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6220
• Description: Abnormally high fuser thermistor 1 (edge) temperature
  The fuser temperature exceeds 240 °C/464 °F for 1 s.
• Causes: Deformed connector pin. Defective cooling fan motor. Defective fuser thermistor. Defective engine PWB.
• Remedy: Deformed connector pin. 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.
  Defective cooling fan motor. Replace the fuser fan motor.
  Defective fuser thermistor. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6230
• Description: Fuser thermistor 1 (edge) break error
  During warming up a hearter, fuser thermistor 2 detects a temperature of 100 °C/212 °F or higher and, fuser thermistor 1 detects a temperature of 37 °C/99 °F or lower.
• Causes: Defective connector cable or poor contact in the connector. Deformed connector pin. Defective fuser thermistor. 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 thermistor 1 and fuser PWB (YC3) Fuser unit and engine PWB (YC22)
  Deformed connector pin. 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.
  Defective fuser thermistor. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6250
• Description: Abnormally low fuser thermistor 1 (edge) temperature
  The fuser temperature lower than 80 °C/176 °F is detected continuously for 1 s during printing.
• Causes: Deformed connector pin. Defective IH PWB. Defective fuser thermistor. Defective fuser heater. Defective engine PWB.
• Remedy: Deformed connector pin. 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.
  Defective IH PWB. Replace the IH PWB and check for correct operation.
  Defective fuser thermistor. Defective fuser heater. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6410
• Description: Fuser unit type mismatch problem
  Absence of the fuser unit is detected.
• Causes: Fuser unit connector inserted incorrectly. Different type of the fuser unit is installed.
• Remedy: Fuser unit connector inserted incorrectly. Reinsert the fuser unit connector if necessary.
  Different type of the fuser unit is installed. Install the correct fuser unit.

• Code: 6600
• Description: Belt rotation error
  The belt was detected to stop for 2 s continuously during motor remote is on.
• Causes: Defective fuser motor. Defective IH belt. Defective IH PWB. Defective engine PWB.
• Remedy: Defective fuser motor. Replace the fuser motor.
  Defective IH belt. Replace the fuser unit.
  Defective IH PWB. Replace the IH PWB and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6710
• Description: CPU thermal runaway (IHPWB)
• Causes: Defective IH PWB.
• Remedy: Defective IH PWB. Replace the IH PWB and check for correct operation.

• Code: 6720
• Description: Belt rotation error (IHPWB)
• Causes: Defective IH PWB. Defective fuser motor. Defective fuser unit.
• Remedy: Defective IH PWB. Replace the IH PWB and check for correct operation.
  Defective fuser motor. Replace the fuser motor.
  Defective fuser unit. Replace the fuser unit.