• Code: 548
• Description: Fusing unit installation error The machine cannot detect the fusing unit when the front cover and right cover are closed.
• Causes: • Fusing unit is not installed, or is installed incorrectly • Fusing unit connection loose

• Code: 620
• Description: Communication timeout error between BICU and finisher or mailbox The BICU does not receive a response after 3 attempts within 100 ms to send data to the finisher or mailbox.
• Causes: • Serial line connecting BICU and finisher unstable • External noise • BICU board and finisher main board connection defective or loose • Finisher main board defective • BICU board defective

• Code: 621
• Description: Communication timeout error between BICU and finisher or mailbox A break (low) signal is received from the finisher or the mailbox.
• Causes: • Serial line connecting BICU and finisher unstable • External noise

• Code: 623
• Description: Communication timeout error between BICU and paper tray unit The BICU does not receive a response after 3 attempts within 100 ms to send data to the paper tray unit.
• Causes: • Serial line connecting BICU and paper tray unit unstable • External noise • BICU board and paper tray main board connection defective or loose • Paper tray main board defective • BICU board defective

• Code: 624
• Description: Communication break error between BICU and paper tray unit The BICU cannot communicate with the paper tray unit because it has received a break signal.
• Causes: • Serial line connecting BICU and paper tray unit unstable • External noise • BICU board and LCT main board connection defective or loose • Optional paper feed unit interface board defective • BICU board defective

• Code: 626
• Description: Communication timeout error between BICU and LCT. The BICU does not receive a response after 3 attempts within 100 ms to send data to the LCT.
• Causes: • Serial line connecting BICU and LCT unit unstable • External noise • BICU board and LCT main board connection defective or loose • LCT interface board defective • BICU board defective

• Code: 627
• Description: Communication break error between BICU and LCT. The BICU cannot communicate with the LCT unit because it has received a break signal.
• Causes: • Serial line connecting BICU and LCT unit unstable • External noise • BICU board and LCT main board connection defective or loose • LCT interface board defective • BICU board defective

• Code: 640
• Description: BICU control data transfer sumcheck error. A sampling of control data sent from the BICU to the controller reveals a sumcheck error. Only the logging count is performed.
• Causes: • Controller board defective • External noise • BICU board defective