• Code: 8340
• Description: CF staple motor error 1 (4000-sheet finisher)
  Staple JAM (center-folding unit) has been detected twice in a row. (The home position could not be detected in 600 ms since the motor was driven after jam was detected twice.
• Causes: Defective connector cable or poor contact in the connector. Defective CF staple sensor. Defective CF staple motor. 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 staple unit and CF main PWB (YC13)
  Defective CF staple sensor. Defective CF staple motor. Replace the CF staple unit.
  Defective CF main PWB. Replace the CF main PWB and check for correct operation.

• Code: 8350
• Description: CF side registration motor 1 error (4000-sheet finisher)
  When initial operation, CF side registration sensor 1 does not turn on within 1 s.
• Causes: Defective connector cable or poor contact in the connector. Defective CF side registration sensor 1. Defective CF side registration motor 1. 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 side registration motor 1 and CF main PWB (YC10) CF side registration sensor 1 and CF main PWB (YC20)
  Defective CF side registration sensor 1. Replace CF side registration sensor 1.
  Defective CF side registration motor 1. Replace CF side registration motor 1.
  Defective CF main PWB. Replace the CF main PWB and check for correct operation.

• Code: 8360
• Description: CF main motor error (4000-sheet finisher)
  During driving the motor, lock signal is detected for 1 s continuously.
• Causes: Defective connector cable or poor contact in the connector. Defective CF main motor. 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 motor and CF main PWB (YC16)
  Defective CF main motor. Replace the CF main motor.
  Defective CF main PWB. Replace the CF main PWB and check for correct operation.

• Code: 8370
• Description: CF staple motor error 2 (4000-sheet finisher)
  Staple JAM (DF) has been detected twice in a row. (The second JAM detection condition fullfilled with a lock detection signal maintained 1 V for 1000 ms continuously, while the stapler motor was driven.)
• Causes: Defective connector cable or poor contact in the connector. Defective CF staple motor. 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 staple unit and CF main PWB (YC13)
  Defective CF staple motor. Replace the CF staple unit.
  Defective CF main PWB. Replace the CF main PWB and check for correct operation.

• 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 (4000-sheet finisher). Defective connector cable or poor contact in the connector (1000-sheet finisher). Defective slide sensor. Defective punch slide motor. 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. Punch slide motor and punch PWB (YC3) Punch slide sensor and punch PWB (YC6) Punch PWB (YC1) and DF main PWB (YC7)
  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. Punch slide motor and punch PWB (YC3) Punch slide sensor and punch PWB (YC6) Punch PWB (YC1) and DF main PWB (YC8)
  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 (4000-sheet finisher). Defective connector cable or poor contact in the connector (1000-sheet finisher). Defective punch slide motor. 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. Punch slide motor and punch PWB (YC3) Punch PWB (YC1) and DF main PWB (YC7)
  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. Punch slide motor and punch PWB (YC3) Punch PWB (YC1) and DF main PWB (YC8)
  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 (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. Punch PWB (YC1) and DF main PWB (YC7)
  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. Punch PWB (YC1) and DF main PWB (YC8)
  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.