• 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: C0610
• Description: Bitmap problem The DIMM on the main PWB does not operate correctly.
• Causes: Defective main PWB. DDR on the main PWB installed incorrectly.
• Remedy: Defective main PWB. Replace the main PWB and check for correct operation.
  DDR on the main PWB installed incorrectly. Check the connection. Repair or replace if necessary.

• Code: C0630
• Description: DMA problem DMA transmission of compressed, decompressed, rotated, relocated or blanked-out image data does not complete within the specified period of time.
• Causes: Defective main PWB. DDR on the main PWB installed incorrectly.
• Remedy: Defective main PWB. Replace the main PWB and check for correct operation.
  DDR on the main PWB installed incorrectly. Check the connection. Repair or replace if necessary.

• 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.

• Code: C0820
• Description: Fax control PWB CG ROM checksum error (optional fax) A checksum error occurred with the CG ROM data of the fax control PWB.
• Causes: Defective fax software. Defective fax control PWB.
• Remedy: Defective fax software. Install the fax software.
  Defective fax control PWB. Replace the fax control PWB and verify the operation.

• Code: C0830
• Description: Fax control PWB flash program area checksum error (optional fax) A checksum error occurred with the program of the fax control PWB.
• Causes: Defective fax software.Defective fax control PWB.
• Remedy: Defective fax software. Install the fax software.
  Defective fax control PWB. Replace the fax control PWB and verify the operation.

• Code: C0860
• Description: Fax control PWB software switch checksum error (optional fax) A checksum error occurred with the software switch value of the fax control PWB.
• Causes: Defective fax software. Defective fax control PWB.
• Remedy: Defective fax software. Install the fax software.
  Defective fax control PWB. Replace the fax control PWB and verify the operation.