• 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: 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: C6000
• Description: Fuser heater 1 break Fuser thermistor 1 detects a temperature lower than the Ready indication temperature for 90 s during warming up. Fuser thermistor 1 deduced less than 130 C/266F for 5 s during stand-by. Fuser thermistor 1 does not reach 75C/ 167F even after 30 s during warming up.
• Causes: Defective fuser heater 1.
  Defective fuser thermostat 1.
  Installation defectiveness on fuser thermistor 1.
  Defective PWB.
• Remedy: Defective fuser heater 1. Check for continuity across each heater. If none, replace the fuser unit.
  Defective fuser thermostat 1. Check for continuity across thermostat. If none, remove the cause and replace the fuser unit.
  Installation defectiveness on fuser thermistor 1. Measure the resistance. If it is ∞, replace the fuser unit.
  Defective PWB. Replace the power source PWB or engine PWB and check for correct operation.

• Code: C6010
• Description: Abnormally high fuser thermistor temperature
  The fuser Abnormally high signal is detected for 60 s or more.
• Causes: Defective PWB.
• Remedy: Replace the power source PWB or engine PWB and check for correct operation.

• Code: C6020
• Description: Abnormally high fuser thermistor 1 temperature The fuser temperature exceeds 240 C/464 F for 1 s.
• Causes: Installation defectiveness on fuser thermistor 1
  Defective PWB
• Remedy: Installation defectiveness on fuser thermistor 1. Measure the resistance. If it is ∞, replace the fuser unit.
  Defective PWB. Replace the power source PWB or engine PWB and check for correct operation.