• Code: 2000
• Description: Main motor error
  The main motor ready input is not given for 2 s during the main motor is ON.
• Causes: Defective harness between main motor (CN1) and control PWB (YC331), or improper connector insertion. Defective drive transmission system of the main motor. Defective main motor. Defective control PWB.
• Remedy: Defective harness between main motor (CN1) and control PWB (YC331), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness.
  Defective drive transmission system of the main motor. Check if the rollers and gears rotate smoothly. If not, grease the bushings and gears. Check for broken gears and replace if any.
  Defective main motor. Replace the main motor.
  Defective control PWB. Replace the control PWB.

• Code: 4000
• Description: Polygon motor (laser scanner unit) error
  The polygon motor ready input is not given for 6 s during the polygon motor is ON.
• Causes: Defective harness between polygon motor and control PWB (YC9), or improper connector insertion. Defective laser scanner unit. Defective control PWB.
• Remedy: Defective harness between polygon motor and control PWB (YC9), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness.
  Defective laser scanner unit. Replace the laser scanner unit.
  Defective control PWB. Replace the control PWB.

• Code: 4200
• Description: BD error (laser scanner unit) error
• Causes: Defective laser scanner unit. Defective control PWB.
• Remedy: Defective laser scanner unit. Replace the laser scanner unit.
  Defective control PWB. Replace the control PWB.

• Code: 6000
• Description: Broken fuser heater lamp wire The fuser temperature does not rise after the fuser heater lamp has been turned on.
• Causes: Poor contact in the fuser thermistor connector terminals. Poor contact in the fuser heater lamp connector terminals. 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.
  Poor contact in the fuser heater lamp connector terminals. Reinsert the connector.
  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: 6020
• Description: Abnormally high fuser thermistor temperature
  Fuser thermistor detects abnormally temperature. When the temperature of a fuser thermistor detects 195 °C or more at the time of heater OFF and 155 °C or more.
• Causes: Shorted fuser thermistor. Defective control PWB.
• Remedy: Shorted fuser thermistor. Replace the fuser unit.
  Defective control PWB. Replace the control PWB.

• 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 (CN202) and control PWB (YC337), or improper connector insertion. Defective harness between power source PWB (YC103) and high voltage PWB (CN202), or improper connector insertion. Defective power source PWB. Defective control PWB.
• Remedy: Defective harness between high voltage PWB (CN202) and control PWB (YC337), 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 (CN202), 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: F000
• Description: Control PWB - Operation panel PWB communication error
• Causes: Defective harness between operation panel PWB (YC1) and control PWB (YC7), or improper connector insertion. Defective operation panel PWB. Defective control PWB.
• Remedy: Defective harness between operation panel PWB (YC1) and control PWB (YC7), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness.
  Defective operation panel PWB. Replace the operation panel PWB.
  Defective control PWB. Replace the control PWB.