• Code: 590-00
• Description: Toner collection motor error The toner collection motor sensor output does not change for 3 s while the toner collection motor is on.
• Causes: • Motor lock due to obstruction • Motor driver board defective • Motor connection loose, defective • Toner collection motor sensor disconnected, sensor defective • Rotational transmission shaft (dia. x 30) missing

• Code: 620-01
• Description: BCU-ADF Communication Error: Break RX abnormal A BREAK was detected after connection.
• Causes: • ADF I/F cable connection loose, broken, defective • ADF control board defective • BCU defective • Serial line level unstable • External noise on the line

• Code: 620-2
• Description: BCU-ADF Communication Error: Timeout
• Causes: • ADF I/F cable connection loose, broken, defective • ADF control board defective • BCU defective • Serial line level unstable • External noise on the line

• Code: 621-01
• Description: BICU/Finisher communication error: Break error During communication with the finisher MBX, the BICU received a break (Low) signal from the finisher.
• Causes: • Connection between main machine loose, broken, defective • Breaker switch defective • Power cord loose, broken, defective • Peripheral unit control board defective

• Code: 621-02
• Description: BCU/Finisher communication error: Timeout error During communication between the finisher MBX and the BCU, no ACK signal was detected for 100 ms, even after three attempts.
• Causes: • Connection between main machine loose, broken, defective • Breaker switch defective • Power cord loose, broken, defective • Peripheral unit control board defective • BCU defective • Serial line level unstable, external noise on the line

• Code: 623
• Description: BCU-PFB communication error More than 2 in communication errors between the BCU and PFB were detected after startup, or more than 3 errors were detected after settings were initialized.
• Causes: • Harness connectors between BCU and PFB loose, broken, disconnected • Serial line connection unstable • External noise on the line • BCU defective • PFB defective

• Code: 626-01
• Description: BICU, LCT communication error: Break reception error During communication with the LCT, the BICU received a break (Low) signal.
• Causes: • LCT connection to main machine loose, broken, defective • LCT control board defective • BCU defective • Serial line connection unstable • External noise on the line

• Code: 626-02
• Description: BICU, LCT communication error: Timeout error After 1 data frame is sent to the LCT, an ACK signal is not received within 100 ms, and is not received after 3 retries.
• Causes: • LCT connection to main machine loose, broken, defective • LCT control board defective • BCU defective • Serial line connection unstable • External noise on the line