• 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: 671
• Description: Engine board mismatch error
  Engine board and controller mismatch detected.
• Causes: • Wrong engine board installed. • Wrong controller board installed. • Check the type of engine board and controller board.
• Remedy: 1. Replace the BCU. 2. Replace the controller board.

• Code: 672
• Description: Controller-to-operation panel communication error at startup
  After powering on the machine, the communication circuit between the controller and the operation panel is not opened, or communication with controller is interrupted after a normal startup.
• Causes: • Controller stall • Controller board installed incorrectly • Controller board defective • Operation panel connector loose or defective
• Remedy: 1. Check the harness connection. 2. Replace the controller board.

• Code: 681
• Description: RFID: Communication error
• Causes: 001-005 Communication error occurs when the RFID starts to communicate with the RFID receptor. • Noise • No memory chip on the toner cartridge • Defective RFID reader and writer • Disconnected RFID controller board I/F 1. Turn the main power off and on. 2. Replace the toner cartridge. 3. Replace the RFID controller board. 061-164 Retry of RFID communication fails three times after the machine has detected the RFID communication error. • Defective RFID reader and writer • No memory chip on the toner cartridge • Noise 1. Replace the toner cartridge. 2. Turn the main power off and on. 3. Replace the RFID-R/W controller board.
• Remedy:

• Code: 682
• Description: Memory chip at TD sensor: Communication error
  Retry of memory chip communication fails three times after the machine has detected the memory chip communication error.
• Causes: • Damaged memory chip data • Disconnected inter face • No memory chip on the development unit • Noise
• Remedy: 1. Replace the development unit. 2. Replace the PCDU.

• Code: 683
• Description: RFID: Unit check error
  The machine gets RFID communication error even the toner cartridges have not been installed in the machine.
• Causes: Caused by noise
• Remedy: Turn the main power switch off and on.

• Code: 687
• Description: Memory address command error
  The BICU does not receive a memory address command from the controller 120 seconds after paper is in the position for registration.
• Causes: • Loose connection • Defective controller • Defective BICU
• Remedy: 1. Check if the controller is firmly connected to the BCU. 2. Update the firmware of the i-controller. 3. Update the firmware of the BCU. 4. Replace the BCU. 5. Replace the i-controller.

• Code: 690
• Description: GAVD communication error
  • The I2C bus device ID is not identified during initialization. • A device-status error occurs during I2C bus communication. • The I2C bus communication is not established due to an error other than a buffer shortage.
• Causes: • Loose connection • Defective BICU • Defective LD controller board
• Remedy: 1. Turn the main switch off and on. 2. Check the cable connection. 3. Replace the laser unit. 4. Replace the BCU board.