• Code: C4100
• Description: BD initialization problem
  When power is turned on, ASIC of engine PWB detects a BD error for 1 s after the polygon motor is activated.
• Causes: Poor contact in the connector terminals.
  Defective APC PWB BK (inner laser scanner unit)
  Defective engine PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC13 on the engine PWB and laser scanner unit, and the continuity across the connector terminals. Repair or replace if necessary.
  Defective APC PWB BK (inner laser scanner unit) Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: C4200
• Description: BD steady-state problem
• 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 YC13 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: C5101
• Description: Main high-voltage K error
  Abnormality of charger roller K is detected when Vpp adjustment.
• Causes: Installation defectiveness on charger roller unit K.
  Defective charger roller unit K
• Remedy: Installation defectiveness on charger roller unit K. Check the mounting state of the charger roller unit K. If any problem is found, repair or replace the unit.
  Defective charger roller unit K. Replace the charger roller unit K.

• Code: C5102
• Description: Main high-voltage C error
  Abnormality of charger roller C is detected when Vpp adjustment.
• Causes: Installation defectiveness on charger roller unit C.
  Defective charger roller unit C
• Remedy: Installation defectiveness on charger roller unit C. Check the mounting state of the charger roller unit C. If any problem is found, repair or replace the unit.
  Defective charger roller unit C. Replace the charger roller unit C.

• Code: C5103
• Description: Main high-voltage M error
  Abnormality of charger roller M is detected when Vpp adjustment.
• Causes: Installation defectiveness on charger roller unit M.
  Defective charger roller unit M.
• Remedy: Installation defectiveness on charger roller unit M. Check the mounting state of the charger roller unit M. If any problem is found, repair or replace the unit.
  Defective charger roller unit M. Replace the charger roller unit M.

• Code: C5104
• Description: Main high-voltage Y error
  Abnormality of charger roller Y is detected when Vpp adjustment.
• Causes: Installation defectiveness on charger roller unit Y.
  Defective charger roller unit Y.
• Remedy: Installation defectiveness on charger roller unit Y. Check the mounting state of the charger roller unit Y. If any problem is found, repair or replace the unit.
  Defective charger roller unit Y. Replace the charger roller unit Y.

• Code: C5301
• Description: Cleaning lamp K error
• Causes: Poor contact in the connector terminals.
  Defective cleaning lamp K.
  Defective PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC3 on the main front PWB and the connector of the drum unit K, and the continuity across the connector terminals. Repair or replace if necessary.
  Defective cleaning lamp K. Replace the drum unit K.
  Defective PWB. Replace the main front PWB or engine PWB and check for correct operation.

• Code: C5302
• Description: Cleaning lamp C error
• Causes: Poor contact in the connector terminals.
  Defective cleaning lamp C.
  Defective PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC5 on the sub front PWB and the connector of the drum unit C, and the continuity across the connector terminals. Repair or replace if necessary.
  Defective cleaning lamp C. Replace the drum unit C.
  Defective PWB. Replace the sub front PWB or engine PWB and check for correct operation.