• Code: 6030
• Description: Broken fuser thermistor wire
  Input from fuser thermistor is 0 (A/D value).
• Causes: Poor contact in the fuser thermistor connector terminals. Broken fuser thermistor wire. Fuser thermistor installed incorrectly. Fuser thermal cutout triggered. Fuser heater lamp installed incorrectly. Broken fuser heater lamp wire.
• Remedy: Poor contact in the fuser thermistor connector terminals. Reinsert the connector.
  Broken fuser thermistor wire. Replace the fuser unit.
  Fuser thermistor installed incorrectly. Replace the fuser unit.
  Fuser thermal cutout triggered. Replace the fuser unit.
  Fuser heater lamp installed incorrectly. Replace the fuser unit.
  Broken fuser heater lamp wire. Replace the fuser unit.

• Code: 6400
• Description: Zero cross signal error
  The zero cross signal does not reach the control PWB for specified time.
• Causes: Defective harness between high voltage PWB (YC202) and control PWB (YC311), or improper connector insertion. Defective harness between power source PWB (YC103) and high voltage PWB (YC201), or improper connector insertion. Defective power source PWB. Defective control PWB.
• Remedy: Defective harness between high voltage PWB (YC202) and control PWB (YC311), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness.
  Defective harness between power source PWB (YC103) and high voltage PWB (YC201), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness.
  Defective power source PWB. Replace the power source PWB.
  Defective control PWB. Replace the control PWB.

• Code: F010
• Description: Control PWB checksum error
• Causes: Defective code ROM (flash memory). Defective control PWB.
• Remedy: Defective code ROM (flash memory). Turn the power switch off/on to restart the printer. If the error is not resolved, replace the control PWB.
  Defective control PWB. Replace the control PWB.

• Code: F020
• Description: Control PWB RAM checksum error
• Causes: Defective main memory (RAM) on the control PWB. Defective expanded memory (DIMM).
• Remedy: Defective main memory (RAM) on the control PWB. Turn the power switch off/on to restart the printer. If the error is not resolved, replace control PWB.
  Defective expanded memory (DIMM). Replace the expanded memory (DIMM).

• Code: F030
• Description: Control PWB general failure
• Causes: Defective control PWB.
• Remedy: Turn the power switch off/on to restart the printer. If the error is not resolved, replace control PWB.

• Code: F040
• Description: Control PWB engine communication error
• Causes: Defective control PWB.
• Remedy: Turn the power switch off/on to restart the printer. If the error is not resolved, replace control PWB.

• Code: F050
• Description: Control PWB engine checksum error
• Causes: Some error may have occurred when downloading the firmware of the control PWB. Defective control PWB.
• Remedy: Some error may have occurred when downloading the firmware of the control PWB. Download the firmware of the control PWB again using the memory card.
  Defective control PWB. Turn the power switch off/on to restart the printer. If the error is not resolved, replace control PWB.

• Code: F226
• Description: Control PWB video data control error
• Causes: Defective control PWB.
• Remedy: Turn the power switch off/on to restart the printer. If the error is not resolved, replace control PWB.