• Code: C4100
• Description: BD initialization (A) problem • When power is turned on, only laser A is output and MIP detects a BD error for 600 ms.
• Causes: Defective laser scanner unit. Defective main PCB.
• Remedy: Replace the LSU. Replace the main PCB and check for correct operation.

• Code: C4110
• Description: BD initialization (B) problem • When power is turned on, only laser B is output and MIP detects a BD error for 600 ms.
• Causes: Defective laser scanner unit. Defective main PCB.
• Remedy: Replace the LSU. Replace the main PCB and check for correct operation.

• Code: C4200
• Description: BD steady-state problem • The MIC detects a BD error for 600 ms after the polygon motor rotation has been stabilized.
• Causes: Defective laser diode. Defective polygon motor. Defective main PCB.
• Remedy: Replace the LSU. Replace the LSU. Replace the main PCB and check for correct operation.

• Code: C5100
• Description: Main charger problem • MC ALM signal is detected continuously for 400 ms when MC REM signal is turned on.
• Causes: Leakage during main charging. Defective high voltage transformer PCB.
• Remedy: Check and clean the main charger unit. Replace the high voltage transformer PCB and check for correct operation.

• Code: C5500
• Description: Drum surface potential sensor problem 1 • The sensor output is 0.5 V or less when MC REM signal is turned on.
• Causes: Poor contact inthe drum surfacepotential sensorconnector terminals. Defective drumsurface potentialsensor. Defective enginePCB. Defective highvoltage transformerPCB.
• Remedy: Reinsert the connector. Also check for continuity within the connector cable. If none, repair or replace the cable. Replace the drum surface potential sensor. Replace the engine PCB and check for correct operation. Replace the high voltage transformer PCB and check for correct operation.

• Code: C5510
• Description: Drum surface potential sensor problem 2 • The sensor output is 4.5 V or more when the MC REM signal is turned on.
• Causes: Defective drum surface potential sensor.
• Remedy: Replace the drum surface potential sensor.

• Code: C5600
• Description: Drum surface potential problem 1 • Maximizing the grid output cannot set the potential.
• Causes: Deteriorated main charger. Grid or main charger shield is dirty. Defective high voltage transformer PCB. Defective engine PCB.
• Remedy: Check the main charger wire and replace it if necessary. Clean the grid or main charger shield if necessary. Replace the high voltage transformer PCB and check for correct operation. Replace the engine PCB and check for correct operation.

• Code: C5610
• Description: Drum surface potential problem 2 • Minimizing the grid output cannot set the potential.
• Causes: Defective high voltage transformer PCB.
• Remedy: Replace the high voltage transformer PCB and check for correct operation.