• Code: C0610
• Description: Bitmap problem • There is a problem with the data or address bus of the bitmap DRAM. • The DIMM on the memory PCB does not operate correctly.
• Causes: Defective main PCB. DIMM installed incorrectly. Defective DIMM.
• Remedy: Replace the main PCB and check for correct operation. Check if the DIMM is inserted into the socket on the main PCB correctly. 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 PCB.
• Remedy: Replace the main PCB and check for correct operation.

• Code: C0640
• Description: Hard disk drive problem • The hard disk drive cannot be accessed.
• Causes: Poor contact of the hard disk drive connector terminals. Defective hard disk drive. Defective main PCB.
• Remedy: Check the connection of connectors YC49 on the main PCB and hard disk drive, and the continuity across the connector terminals. Repair or replace if necessary. 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. Replace the main PCB and check for correct operation.

• Code: C0820
• Description: Fax control PCB CG ROM checksum error • A checksum error occurred with the CG ROM data of the fax control PCB.
• Causes: Defective fax software. Defective fax control PCB.
• Remedy: Install the fax software to Ver. 2.xx or later. Replace the fax control PCB and check for correct operation.

• Code: C0830
• Description: Fax control PCB flash program area checksum error • A checksum error occurred with the program of the fax control PCB.
• Causes: Defective fax software. Defective fax control PCB.
• Remedy: Install the fax software to Ver. 2.xx or later. Replace the fax control PCB and check for correct operation.

• Code: C0860
• Description: Fax control PCB software switch checksum error • A checksum error occurred with the software switch value of the fax control PCB.
• Causes: Defective fax software. Defective fax control PCB.
• Remedy: Install the fax software to Ver. 2.xx or later. Replace the fax control PCB and check for correct operation.

• Code: C0870
• Description: Graphics data transfer problem • High-capacity data transfer between the fax control PCB and the main PCB was not normally performed even if the data transfer was retried the specified times.
• Causes: Poor contact in the connector terminals. Defective main PCB or fax control PCB.
• Remedy: Check the connection of connector YC44 on the fax control PCB and the main PCB, and the continuity across the connector terminals. Repair or replace if necessary. Replace the main PCB or fax control PCB and check for correct operation.

• Code: C0880
• Description: Program archive problem • When power is turned on, the compressed program in the Flash ROM on the fax control PCB was not successfully decompressed.
• Causes: Defective fax software. Defective fax control PCB.
• Remedy: Install the fax software to Ver. 2.xx or later. Replace the fax control PCB and check for correct operation.