• Code: 4700
• Description: VIDEO ASIC device error
• Causes: Defective connector cable or poor contact in the connector.
  Defective main PWB or 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. Main PWB (YC105) and engine PWB (YC17)
  Defective main PWB or engine PWB. Replace the main PWB or the engine PWB and check for correct operation.

• Code: 6000
• Description: Broken fuser heater wire
  The detected temperature of fuser thermistor does not reach the specified temperature (ready indication temperature) after the fuser heater has been turned on continuously for 60 s in warming up. The fusing temperature at 7 seconds and 20 seconds since fuser temperature control has occurred differs by 43°C/109.4°F or less.
• Causes: Defective connector cable or poor contact in the connector.
  Deformed connector pin.
  Defective triac.
  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. Fuser heater and power source PWB (YC102) Fuser unit and engine PWB (YC7)
  Broken fuser heater wire. Fuser thermostat triggered. Reinsert the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6020
• Description: Abnormally high fuser thermistor temperature
  The fuser thermistor detects a temperature higher than 230°C/446°F continuously for 40 ms. High fuser temperature signal detects a temperature of 255°C/491°F continuously for 40 ms.
• Causes: Deformed connector pin.
  Defective triac.
  Shorted fuser thermistor.
  Defective engine PWB.
• Remedy: Shorted fuser thermistor. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6030
• Description: Broken fuser thermistor wire
  A/D value of the fuser thermistor exceeds 251 bit continuously for 7 s during warming up.
• Causes: Defective connector cable or poor contact in the connector.
  Deformed connector pin.
  Defective triac.
  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 heater and power source PWB (YC102) Fuser unit and engine PWB (YC7)
  Defective fuser thermistor. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6050
• Description: Abnormally low fuser thermistor temperature
  As the stable temperature has reached the second time, the decrease in the fuser thermistor temperature of 60°C/140°F or greater is detected for one second.
• Causes: Deformed connector pin.
  Defective triac.
  Defective fuser thermistor
  Defective fuser heater.
  Defective engine PWB.
• Remedy: Defective fuser heater. Defective fuser thermistor. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6400
• Description: Zero-cross signal error
  While fuser heater control is performed, the zero-cross signal is not input within 3 s.
• Causes: Defective connector cable or poor contact in the connector
  Defective power source PWB or 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 (YC4) and engine PWB (YC21)
  Defective power source PWB or engine PWB. Replace the power source PWB or the engine PWB and check for correct operation.

• Code: 7800
• Description: Broken external thermistor wire
  The thermistor output value is 0.3 V or less.
• Causes: Defective connector cable or poor contact in the connector.
  Defective temperature sensor.
• 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. Temperature sensor and engine PWB (YC21)
  Defective temperature sensor. Replace the temperature sensor.

• Code: 7810
• Description: Short-circuited external thermistor wire
  The thermistor output value is 3 V or more.
• Causes: Defective connector cable or poor contact in the connector.
  Defective temperature sensor.
• 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. Temperature sensor and engine PWB (YC21)
  Defective temperature sensor. Replace the temperature sensor.