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

• Code: 670
• Description: No response from controller at power on
  When the main power is turned on or the machine starts warming up from energysaving mode, the controller does not receive a command signal from the controller.
• Causes: • Loose connection • Defective controller • Defective controller board
• Remedy: 1. Check the connection between the BCU and controller. 2. Replace the controller. 3. Replace the BCU.

• Code: 672
• Description: Controller-to-operation panel communication error at startup
  • After the machine is powered on, the communication between the controller and the operation panel is not established, or communication with controller is interrupted after a normal startup. • After startup reset of the operation panel, the attention code or the attention acknowledge code is not sent from the controller within 15 seconds. • After the controller issues a command to check the communication line with the controller at 30-second intervals, the controller fails to respond twice.
• Causes: • Controller stalled • Controller board installed incorrectly • Controller board defective • Operation panel connector loose or defective • The controller is not completely shutdown when you turn the main switch off.
• Remedy: 1. Check the setting of SP5875-001. If the setting is set to "1 (OFF)", change it to "0 (OFF)". 2. Check the condition of the controller board. 3. Check the condition of the operation panel. 4. Replace the controller board. 5. Replace the operation panel. 6. Turn the main switch off, wait for one second or more, and turn the main switch on.

• Code: 681
• Description: RFID: Communication error
  • Communication error occurs when the RFID starts to communicate with the RFID receptor. • Retry of RFID communication fails three times after the machine has detected the RFID communication error.
• Causes: • Defective RFID reader and writer • Disconnected ASAP I/F • No memory chip on the toner cartridge • Noise
• Remedy: 1. Replace the RFID controller board. 2. Replace the toner cartridge.

• 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 PCU.

• 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: 1. Turn the main power switch off and on.

• Code: 687
• Description: Memory address command error
  The BCU 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 BCU
• Remedy: 1. Check if the controller is firmly connected to the BCU. 2. Replace the controller. 3. Replace the BCU.

• Code: 689
• Description: IH inverter communication error
  • When the machine turns on, recovers from the energy save mode or front and right doors are opened and closed, a time out error for communicating with the IOB occurs. • The IOB detects the break signal from the IH inverter after a communication between the IOB and IH inverter has already been detected. • The IOB fails to communicate with IH inverter three times after the IOB has detected the break signal from the IH inverter.
• Causes: • Defective IOB • Defective IH inverter.
• Remedy: 1. Turn the main power switch off and on. 2. If the error occurs again, replace the IOB and/or the IH inverter