• Code: 623
• Description: Optional paper feed unit communication error
  In the case of installing two optional paper feed units (G832 + B800, G832 + B801, or G832 + G832): • The upper unit cannot communicate with the lower unit after the upper unit has detected the lower unit. • The upper unit detects an error signal from the lower unit after the upper unit has detected the lower unit.
• Causes: • Disconnected connector
• Remedy: Check and/ or connect the connector.

• Code: 636-01
• Description: SD Card Error. Expanded authentication module error There is no expanded authentication module in the machine. The SD card or the file of the expanded authentication module is broken. There is no DESS module in the machine.
• Causes: • No expanded authentication module • Defective SD card • No DESS module
• Remedy: 1. Install the expanded authentication module. 2. Install the SD card. 3. Install the DESS module.

• Code: 641
• Description: BICU control data transfer abnormal
  A sampling of the control data sent from the BICU reveals an abnormality.
• Causes: • Defective controller board • External noise • Defective BCU
• Remedy: 1. Replace the controller board. 2. Replace the BCU.

• 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: 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
  • 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: Replace the PCU.