• Code: C3100
• Description: Scanner carriage problem
  The home position is not correct when the power is turned on or at the start of copying using the table.
• Causes: Poor contact in the connector terminals.
  Defective home position switch.
  Defective scanner motor.
  The mirror frame, exposure lamp, or scanner wire is defective.
  Defective engine PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC5 on the engine PWB and the connector on the home position switch, and the continuity across the connector terminals. Repair or replace if necessary.
  Defective home position switch. Replace the home position switch.
  Defective scanner motor. Replace the scanner motor.
  The mirror frame, exposure lamp, or scanner wire is defective. Check if the mirror flames and exposure lamp are on the rail. And check the scanner wire winds correctly.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: C3200
• Description: Exposure lamp problem
  Non-lighting of the exposure lamp is detected at the beginning of copying.
• Causes: Poor contact in the connector terminals.
  Defective exposure lamp.
  Incorrect shading position.
  Defective PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC16 on the engine PWB and the connector on the inverter PWB, and the continuity across the connector terminals. Repair or replace if necessary.
  Defective exposure lamp. Replace the exposure lamp.
  Incorrect shading position. Adjust the position of the contact glass (shading plate). If the problem still occurs, replace the home position switch.
  Defective PWB. Replace the engine PWB or inverter PWB and check for correct operation.

• Code: C3300
• Description: AGC problem
  After AGC, correct input is not obtained at CCD.
• Causes: Poor contact in the connector terminals.
  Defective exposure lamp
  Defective PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC5 on the main PWB and the connector on the CCD PWB, and the continuity across the connector terminals. Repair or replace if necessary.
  Defective exposure lamp. Replace the exposure lamp.
  Defective PWB. Replace the main PWB or CCD PWB and check for correct operation.

• Code: C4000
• Description: Polygon motor synchronization problem
  The polygon motor does not reach the stable speed within 20 s of the START signal turning on.
• Causes: Poor contact in the connector terminals.
  Defective polygon motor.
  Defective engine PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC3 on the engine PWB and laser scanner unit, and the continuity across the connector terminals. Repair or replace if necessary.
  Defective polygon motor. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: C4010
• Description: Polygon motor steady-state problem
  Stable OFF is detected for 5 s continuously after polygon motor stability.
• Causes: Poor contact in the connector terminals.
  Defective polygon motor.
  Defective engine PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC3 on the engine PWB and laser scanner unit, and the continuity across the connector terminals. Repair or replace if necessary.
  Defective polygon motor. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: C4200
• Description: BD steady-state problem
  ASIC detects a BD error for 600 ms after the polygon motor rotation has been stabilized.
• Causes: Poor contact in the connector terminals.
  Defective laser scanner unit.
  Defective engine PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC3 on the engine PWB and laser scanner unit, and the continuity across the connector terminals. Repair or replace if necessary.
  Defective laser scanner unit. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: C6000
• Description: Fuser heater break
  The temperature does not reach 70 °C/ 158°F in 15 s before secondary stabilization.
  Temperature rise of 1°C/1.8°F does not occur in 5 s before secondary stabilization (except during printing).
• Causes: Poor contact in the fuser thermistor connector terminals.
  Fuser thermistor installed incorrectly.
  Fuser thermostat triggered.
  Fuser heater installed incorrectly.
  Broken fuser heater wire.
• Remedy: Poor contact in the fuser thermistor connector terminals. Reinsert the connector. Also check for continuity within the connector cable. If none, remedy or replace the cable.
  Fuser thermistor installed incorrectly. Check and reinstall if necessary.
  Fuser thermostat triggered. Check for continuity. If none, replace the fuser thermostat.
  Fuser heater installed incorrectly. Check and reinstall if necessary.
  Broken fuser heater wire. Check for continuity. If none, replace the fuser heater.

• Code: C6020
• Description: Abnormally high fuser thermistor temperature
  Fuser thermistor is detected 230°C/ 446°F or more for 40 ms
• Causes: Shorted thermistor.
  Broken heater control circuit on the power source PWB.
• Remedy: Shorted thermistor. Measure the resistance. If it is 0 Ω, replace the thermistor.
  Broken heater control circuit on the power source PWB. Replace the power source PWB and check for correct operation.