• Code: C0060
• Description: Main PWB type mismatch error
• Causes: Defective PWB.
• Remedy: Defective PWB. Run maintenance item U935 to contact the Service Administrative Division.

• Code: C0120
• Description: Drum EEPROM error Reading from or writing to EEPROM cannot be performed.
• Causes: Poor contact in the connector terminals. Defective drum unit.
• Remedy: Poor contact in the connector terminals. Check the connection of connector on the engine PWB and the continuity across the connector terminals. Repair or replace if necessary. Defective drum unit. Replace the drum unit.

• Code: C0130
• Description: Backup memory (EEPROM) device problem (Main PWB) Reading from or writing to EEPROM cannot be performed.
• Causes: Defective main PWB. Device damage of EEPROM.
• Remedy: Defective main PWB. Replace the main PWB and check for correct operation. Device damage of EEPROM. Contact the Service Administrative Division.

• Code: C0150
• Description: Backup memory (EEPROM) device problem (Engine PWB) Reading from or writing to EEPROM cannot be performed.
• Causes: Defective engine PWB. Device damage of EEPROM.
• Remedy: Defective engine PWB. Replace the engine PWB and check for correct operation. Device damage of EEPROM. Contact the Service Administrative Division.

• Code: C0160
• Description: Backup memory (EEPROM) data problem (Engine PWB) Reading data from EEPROM is abnormal. Read and write data does not match 5 times continuously.
• Causes: Problem with the backup memory data. Defective engine PWB.
• Remedy: Problem with the backup memory data. Run maintenance item U022 to initialize the backup memory data. Defective engine PWB. If the C0160 is displayed after initializing the backup memory, replace the engine PWB and check for correct operation.

• Code: C0180
• Description: Machine number mismatch error Machine number of main PWB and engine PWB does not match.
• Causes: Data damage of EEPROM.
• Remedy: Data damage of EEPROM. Contact the Service Administrative Division.

• 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.