• Code: 8410
• Description: Punch slide motor error 1
  The punch slide sensor won’t turn On when home position has been moved by 30 mm.
• Causes: Defective connector cable or poor contact in the connector.
  Defective slide sensor.
  Defective punch slide motor.
  Defective 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. Punch slide motor and punch PWB (YC3) Punch slide sensor and punch PWB (YC6) Punch PWB (YC1) and DF main PWB (YC7)
  Defective slide sensor. Replace the punch slide sensor.
  Defective punch slide motor. Replace the punch slide motor.
  Defective PWB. Replace the punch PWB or DF main PWB and check for correct operation.

• Code: 8420
• Description: Punch slide motor error 2
  In detection of paper edges, the paper edge cannot be detected in 30 mm move.
• Causes: Defective connector cable or poor contact in the connector.
  Defective punch slide motor.
  Defective 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. Punch slide motor and punch PWB (YC3) Punch PWB (YC1) and DF main PWB (YC7)
  Defective punch slide motor. Replace the punch slide motor.
  Defective PWB. Replace the punch PWB or DF main PWB and check for correct operation.

• Code: 8430
• Description: Punch unit communication error
  Communication failed to be established after the punch unit was hooked up.
• Causes: Defective connector cable or poor contact in the connector.
  Defective 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. Punch PWB (YC1) and DF main PWB (YC7)
  Defective PWB. Replace the punch PWB or the DF main PWB and check for correct operation.

• Code: 8500
• Description: Mailbox communication error (4000-sheet finisher)
  Communication failed to be established after the mailbox was hooked up.
• Causes: Defective connector cable or poor contact in the connector.
  Defective 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 main PWB (YC3) and DF main PWB (YC6)
  Defective PWB. Replace the MB main PWB or the DF main PWB and check for correct operation.

• 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 communication error
  Communication failed to be established after the document finisher was hooked up.
• Causes: Defective connector cable or poor contact in the connector.
  Defective 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. DF main PWB (YC4) 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.
  Improper installation EEPROM.
  Defective DF 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. DF main PWB (YC4) 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.