• Code: 547
• Description: Zero cross signal malfunction
  Zero cross signals are not detected within a certain period.
• Causes: • Power supply board defective • SBCU board defective

• Code: 548
• Description: Fusing unit set error
  The machine does not detect the fusing unit.
• Causes: • Poor connection of the fusing unit • The fusing unit is not installed

• Code: 590
• Description: Exhaust fan motor error
  The CPU detects an exhaust fan lock signal for more than 5 seconds.
• Causes: • Poor connection of the exhaust fan motor • Too much load on the motor drive

• Code: 611
• Description: Communication break error between SBCU and ADF
  The SBCU receives a break signal from the ADF main board.
• Causes: • Serial line connecting SBCU and ADF unstable • External noise • ADF main board defective • SBCU board defective

• Code: 612
• Description: Communication command error between SBCU and ADF
  The SBCU sends a command to the ADF main board that it cannot execute.
• Causes: • SBCU board defective • Download SBCU firmware again

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

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

• Code: 630
• Description: Communication failure with CSS (RSS)
  The communication from the copier was detected as abnormal at the CSS center. This error occurs when the acknowledge signal from the LADP does not complete normally.
• Causes: • Occurred with an SC call, CC call, supply management call, user call, or CE call. • Timeout while no response from the LADP, and abnormal signal on the RS-485 line between PI and LADP.