• Code: C2340
• Description: Fuser drive motor driving clock table error • An error has occurred in the driving clock table on the engine controller PCB that controls the fuser drive motor (a stepping motor).
• Causes: Defective engine controller PCB.
• Remedy: Replace the engine controller PCB and check for correct operation.

• Code: C2500
• Description: Paper feed motor lock • The FG (Frequency generation) pulse which the paper feed motor generates is not entered at the correct frequency in ASIC (U8) on the engine controller PCB during normal operation.
• Causes: Defective engine controller PCB. Defective paper feed motor. Excessive torque for driving paper feed unit. (Overloaded by a damaged gear.) Defective harness between engine controller PCB and paper feed motor, or poor contact of the connector terminals.
• Remedy: Replace the engine controller PCB and check for correct operation. Replace the paper feed motor. Check if the paper feed unit rotates smoothly. Check for broken gears. Replace if any. Check the continuity of the harness and the insertion of connectors.

• Code: C2510
• Description: Paper feed motor starting error • No FG (Frequency generation) pulse is entered within the predetermined period when ASIC (U8) on the engine controller PCB has issued a motor activation signal to the paper feed motor.
• Causes: Defective engine controller PCB. Defective paper feed motor. Excessive torque for driving paper feed unit. (Overloaded by a damaged gear.) Defective harness between engine controller PCB and paper feed motor, or poor contact of the connector terminals.
• Remedy: Replace the engine controller PCB and check for correct operation. Replace the paper feed motor. Check if the paper feed unit rotates smoothly. Check for broken gears. Replace if any. Check the continuity of the harness and the insertion of connectors.

• Code: C2520
• Description: Paper feed motor starting time-out • The FG (Frequency generation) pulse does not reach the correct frequency within 30 s when ASIC (U8) on the engine controller PCB has issued a motor activation signal to the paper feed motor.
• Causes: Defective engine controller PCB. Defective paper feed motor. Excessive torque for driving paper feed unit. (Overloaded by a damaged gear.) Defective harness between engine controller PCB and main paper feed, or poor contact of the connector terminals.
• Remedy: Replace the engine controller PCB and check for correct operation. Replace the paper feed motor. Check if the paper feed unit rotates smoothly. Check for broken gears. Replace if any. Check the continuity of the harness and the insertion of connectors.

• 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 bypass table.
• Causes: Defective scanner main PCB. Defective scanner home position switch. Defective scanner motor. Poor contact in the connector terminals. Defective mirror flame, exposure lamp or scanner wire.
• Remedy: Replace the scanner main PCB and check for correct operation. Replace the scanner home position switch. Replace the scanner motor. Check the connection of connector CN40 on the scanner main PCB and the continuity across the connector terminals. Repair or replace if necessary. Check if the mirror flames and exposure lamp are on the rail. And check the scanner wire winds correctly.

• Code: C3200
• Description: Exposure lamp problem • Check the CCD input value for the lighting status of the exposure lamp 500 ms after the exposure lamp is lit and the carriage is moved to the shading position. If the exposure lamp does not light, a further 100 ms later, check the CCD input. The exposure lamp does not light after 50 retries.
• Causes: Defective scanner main PCB. Defective exposure lamp or inverter PCB. Incorrect shading position. Poor contact of the connector terminals. Defective scanner sub PCB or CCD PCB.
• Remedy: Replace the scanner main PCB and check for correct operation. Replace the exposure lamp or inverter PCB. Adjust the position of the contact glass (shading plate). If the problem still occurs, replace the scanner home position switch. Check the connection of connector YC1119 on the scanner main PCB, and the continuity across the connector terminals. Repair or replace if necessary. Replace the scanner sub PCB or CCD PCB and check for correct operation.

• Code: C4000
• Description: Polygon motor error • The CPU (U2) of the engine controller PCB outputs a motor start signal to the laser scanner unit but the READY signal is not input within 30 seconds.
• Causes: Defective engine controller PCB. Defective laser scanner unit (PD PCB). Defective harness between engine controller PCB and laser scanner unit, or poor contact of the connector terminals.
• Remedy: Replace the engine controller PCB and check for correct operation. Replace the laser scanner unit. Check the continuity of the harness and the insertion of connectors.

• Code: C4200
• Description: Horizontal synchronized signal (PD) detection error • The ASIC (U7) of the engine controller PCB outputs a laser start signal but a horizontal synchronizing signal (PD) is not input from the laser scanner unit within 600 ms.
• Causes: Defective engine controller PCB. Defective laser scanner unit (PD PCB). Defective harness between engine controller PCB and laser scanner unit, or poor contact of the connector terminals.
• Remedy: Replace the engine controller PCB and check for correct operation. Replace the laser scanner unit. Check the continuity of the harness and the insertion of connectors.