• Code: 622
• Description: Option paper unit communication error After the system starts, the communication with the paper tray is unexpectedly interrupted.
• Causes: • Defective cable connection
• Remedy: 1. Connect the cable to the paper tray correctly.

• Code: 640
• Description: Controller to engine communication error. Checksum error detected between the controller and the engine board.
• Causes: • Defective controller • Defective engine board
• Remedy: 1. Check the connection between the controller and the engine board. 2. Replace the engine board if the error is frequent. 3. Replace the controller board if the error is frequent.

• Code: 641
• Description: Controller to engine communication error. The controller receives no response from the engine board.
• Causes: • Defective controller • Defective engine board
• Remedy: 1. Check the connection between the controller and the engine board. 2. Replace the engine board if the error is frequent. 3. Replace the controller board if the error is frequent.

• Code: 670
• Description: Engine start-up error The ready signal from the engine board is not detected.
• Causes: • Defective engine board.
• Remedy: Replace the engine board.

• Code: 680
• Description: EEPROM error Data is not write to or read from the EEPROM.
• Causes: • Defective EEPROM (IC5) • Defective engine control board
• Remedy: 1. Replace the EEPROM. 2. Replace the engine control board.

• Code: 818
• Description: System timeout error System program timeout error detected.
• Causes: • Defective controller
• Remedy: Replace the controller if it occurs frequently.

• Code: 819
• Description: Kernel stop error Unexpected CPU error by the ASIC/ RAM full detected.
• Causes: • Defective controller
• Remedy: Replace the controller if it occurs frequently.

• Code: 820
• Description: Self-diagnostic error . CPU CPU error detected during self-diagnostic.
• Causes: • Defective controller
• Remedy: Replace the controller if the error is frequent.