Description: CPU communication problem There is no reply after 3 retries at communication.
Causes: Poor contact in the connector terminals. Defective PWB.
Remedy: Poor contact in the connector terminals. Check the connection of the engine PWB and main PWB, and the continuity across the connector terminals. Repair or replace if necessary. Defective PWB. Replace the engine PWB or main PWB and check for correct operation.
Code: C0240
Description: Printer PWB communication problem The printer PWB does not respond 120 s after the power is turned on.
Causes: Poor contact in the connector terminals. DIMM or DDR installed incorrectly. Defective PWB.
Remedy: Poor contact in the connector terminals. Check the connection of the interface PWB and the printer PWB, and the continuity across the connector terminals. Repair or replace if necessary. DIMM or DDR installed incorrectly. Check the connection of DIMM or DDR. Repair or replace if necessary. Defective PWB. Replace the printer PWB or engine PWB and check for correct operation.
Code: C0280
Description: Communication problem between the fax control PWB and main PWB After main PWB status change signal turns on 3 minute, when it does not receive key required command from the fax control PWB, one time it resets the FAX. After that, while main PWB status change signal turns on furthermore 1 minute, when it does not receive key required command from the fax control PWB. When FAX_READY signal continues fake for 6 s, one time it resets the FAX. After that, when FAX_READY fake continues fake for 6 s.
Causes: Poor contact in the connector terminals. Defective PWB.
Remedy: Poor contact in the connector terminals. Check the connection of the main PWB and the fax control PWB, and the continuity across the connector terminals. Repair or replace if necessary. Defective PWB. Replace the fax control PWB or main PWB and check for correct operation.
Code: C0320
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.