Description: Power CPU communication problem The engine PWB and the power CPU are unable to communicate with each other.
Causes: Defective engine PWB.
Remedy: Defective engine PWB. Replace the engine PWB and check for correct operation.
Code: C0420
Description: Optional paper feeder communication problem The engine PWB and the paper feeder are unable to communicate with each other.
Causes: Poor contact in the connector terminals. Defective PWB.
Remedy: Poor contact in the connector terminals. Check the connection of connector YC22 on the engine PWB and the connector on the paper feeder main PWB, and the continuity across the connector terminals. Repair or replace if necessary. Defective PWB. Replace the engine PWB or paper feeder main PWB and check for correct operation.
Code: C0440
Description: Optional document finisher/built-in finisher communication problem The engine PWB and the document finisher or the built-in finisher are unable to communicate with each other.
Causes: Poor contact in the connector terminals. Defective PWB
Remedy: Poor contact in the connector terminals. Check the connection of connector YC5 on the engine PWB and the connector of the document finisher, and the continuity across the connector terminals. Repair or replace if necessary. Check the connection of connector YC4 on the engine PWB and the connector of the built-in finisher, and the continuity across the connector terminals. Repair or replace if necessary. Defective PWB. Replace the engine PWB or finisher main PWB and check for correct operation.
Code: C0640
Description: Hard disk drive problem The hard disk cannot be accessed.
Causes: Poor contact in the connector terminals. Defective hard disk. Defective main PWB.
Remedy: Poor contact in the connector terminals. Check the connection of connector YC8 on the main PWB and the connector on the hard disk. Repair or replace if necessary. Defective hard disk. Run U024 (HDD formatting) without turning the power off to initialize the hard disk. Replace the hard disk drive and check for correct operation if the problem is still detected after initialization. Defective main PWB. Replace the main PWB and check for correct operation.
Code: C0700
Description: Memory card error for backup Optional fax backup kit (memory card) is not suitable as backup.
Remedy: Memory card installed incorrectly. Install memory card correctly. Defective memory card. Run the maintenance item U933 to initialize the memory card (see page 1-3-79).
Code: C0800
Description: Image processing problem JAM05 is detected twice.
Causes: Defective main PWB.
Remedy: Defective main PWB. Replace the main PWB and check for correct operation.