• Code: C0440
• Description: Built-in finisher communication problem
  Communication fails five times successively.
• Causes: Poor contact in the connector terminals.
  Defective PWB.
• Remedy: Poor contact in the connector terminals. 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: C0500
• Description: Second paper feeder communication problem
  Communication fails five times succes-sively.
• Causes: Second paper feeder installed incorrectly.
  Defective PWB.
• Remedy: Second paper feeder installed incorrectly. Check the installation state of the second paper feeder and adjust it if it is not properly installed.
  Defective PWB. Replace the engine PWB or cassette main PWB and check for correct operation.

• Code: C0510
• Description: Third paper feeder communication problem
  Communication fails five times successively.
• Causes: Third paper feeder installed incorrectly.
  Defective PWB.
• Remedy: Third paper feeder installed incorrectly. Check the installation state of the third paper feeder and adjust it if it is not properly installed.
  Defective PWB. Replace the engine PWB or cassette main PWB and check for correct operation.

• Code: C0610
• Description: Bitmap (DIMM) problem
  There is a problem with the data or address bus of the bitmap DRAM.
• Causes: Defective main PWB.
  DIMM installed incorrectly.
  Defective DIMM.
• Remedy: Defective main PWB. Replace the main PWB and check for correct operation.
  DIMM installed incorrectly. Check if the DIMM is inserted into the socket on the main PWB correctly.
  Defective DIMM. Replace the DIMM and check for correct operation.

• 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.
• Remedy: Replace the main PWB and check for correct operation.

• Code: C0800
• Description: Image processing problem
  JAM05 is detected twice.
• Causes: Defective main PWB.
• Remedy: Replace the main PWB and check for correct operation.

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

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