• Code: 641
• Description: BCU control data transfer abnormal
  A sampling of the control data sent from the BCU reveals an abnormality.
• Causes: • Controller board defective • External noise • BCU defective
• Remedy: 1. Check the connection between the controller board and BCU. 2. Replace the controller board. 3. Replace the BCU.

• Code: 652
• Description: Remote service ID2 mismatch error
  The ID2 in the individual certificate does not match the ID2 in the NVRAM on the controller board.
• Causes: • The controller board in this machine has already been used in a machine in which RC Gate was installed. • The controller board NVRAM in this machine has already been used in a machine in which RC Gate was installed.
• Remedy: If an error occurs at installation of the RC Gate: 1. Check that the individual certificate is correct for the NVRAM in the machine and that the ID2 is correct. 2. Reinstall the RC Gate after writing the common certificate. If an error occurs after installation of the RC Gate: 1. Clear the RC Gate data. 2. Check that the individual certificate is correct for the NVRAM in the machine and that the ID2 is correct. 3. Reinstall the RC Gate after writing the common certificate.

• Code: 653
• Description: Remote service ID2 incorrect error
  The ID2 in the NVRAM on the controller board is incorrect.
• Causes: • ID2 is not exactly 17 bytes. • ID2 includes text which cannot be printed. • ID2 is all filled by spaces. • ID2 is null.
• Remedy: 1. Clear the RC Gate data. 2. Reinstall the RC Gate after writing the common certificate.

• Code: 669
• Description: NVRAM error
  Retry of NVRAM communication fails three times after the machine has detected the NVRAM error.
• Causes: Caused by noise
• Remedy: Turn the main power switch off and on.

• 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: 681
• Description: RFID: Communication error
• Causes: 001-005 Communication error occurs when the RFID starts to communicate with the RFID board. • Noise • No memory chip on the toner cartridge • Defective RFID CPU board • Defective RFID board • Disconnected RFID CPU board I/F • Disconnected RFID board I/F 1. Turn the main power off and on. 2. Replace the toner cartridge. 3. Replace the RFID CPU board. 4. Replace the RFID board. 061-164 Retry of RFID communication fails three times after the machine has detected the RFID communication error. • Defective RFID CPU board • Defective RFID board • 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 CPU board. 4. Replace the RFID 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: Replace the PCDU.