• Code: 8510
• Description: MB conveying motor error 1 (4000-sheet finisher)
  When initial operation, MB home position sensor does not turn on within 5 s.
• Causes: Defective connector cable or poor contact in the connector. Defective MB home position sensor. Defective MB conveying motor. Defective MB main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. MB conveying motor and MB main PWB (YC5) MB home position sensor and MB main PWB (YC2)
  Defective MB home position sensor. Replace the MB home position sensor.
  Defective MB conveying motor. Replace the MB conveying motor.
  Defective MB main PWB. Replace the MB main PWB and check for correct operation.

• Code: 8520
• Description: MB conveying motor error 2 (4000-sheet finisher)
  When standby operation, MB home position sensor does not turn off within 1 s.
• Causes: Defective connector cable or poor contact in the connector. Defective MB home position sensor. Defective MB conveying motor. Defective MB main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. MB conveying motor and MB main PWB (YC5) MB home position sensor and MB main PWB (YC2)
  Defective MB home position sensor. Replace the MB home position sensor.
  Defective MB conveying motor. Replace the MB conveying motor.
  Defective MB main PWB. Replace the MB main PWB and check for correct operation.

• Code: 8800
• Description: Document finisher main program error Document finisher main program error at power up.
• Causes: Defective connector cable or poor contact in the connector (4000-sheet finisher). Defective connector cable or poor contact in the connector (1000-sheet finisher). Defective PWB.
• Remedy: Defective connector cable or poor contact in the connector (4000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF main PWB (YC4) and engine PWB (YC18)
  Defective connector cable or poor contact in the connector (1000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF main PWB (YC7) and engine PWB (YC18)
  Defective PWB. Replace the DF main PWB or the engine PWB and check for correct operation.

• Code: 8900
• Description: Document finisher backup error
  Read and write data does not match 3 times in succession.
• Causes: Defective connector cable or poor contact in the connector (4000-sheet finisher). Defective connector cable or poor contact in the connector (1000-sheet finisher). Improper installation EEPROM. Defective DF main PWB.
• Remedy: Defective connector cable or poor contact in the connector (4000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF main PWB (YC4) and engine PWB (YC18)
  Defective connector cable or poor contact in the connector (1000-sheet finisher). Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. DF main PWB (YC7) and engine PWB (YC18)
  Improper installation EEPROM. Check the installation of the EEPROM and remedy if necessary.
  Defective DF main PWB. Replace the DF main PWB and check for correct operation.

• Code: 8930
• Description: Center-folding unit backup error (4000-sheet finisher)
  Read and write data does not match 3 times in succession.
• Causes: Defective connector cable or poor contact in the connector. Improper installation EEPROM. Defective CF main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. CF main PWB (YC7) and DF main PWB (YC9)
  Improper installation EEPROM. Check the installation of the EEPROM and remedy if necessary.
  Defective CF main PWB. Replace the CF main PWB and check for correct operation.

• Code: F000
• Description: Communication error between main PWB and operation PWB
• Causes: Defective main PWB. Defective operation PWB.
• Remedy: Defective main PWB. Turn the main power switch off/on to restart the machine. If the error is not resolved, replace main PWB.
  Defective operation PWB. Replace the operation PWB and check for correct operation.

• Code: F010
• Description: Main PWB checksum error
• Causes: Defective main PWB.
• Remedy: Defective main PWB. Turn the main power switch off/on to restart the machine. If the error is not resolved, replace main PWB.

• Code: F040
• Description: Communication error between main PWB and print engine
• Causes: Defective main PWB. Defective engine PWB.
• Remedy: Defective main PWB. Turn the main power switch off/on to restart the machine. If the error is not resolved, replace main PWB.
  Defective engine PWB. Replace the engine PWB and check for correct operation.