• 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.
• Remedy: Punch slide motor 1. Execute U240 Booklet - Punch Move to check the finisher operation. 2. Manipulate the punch slide part of the punch unit back and forth to check it can smoothly move. 3. Check that the drive from the motor reaches punch area. 4. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Punch slide motor and Punch PWB (YC3) 5. If the wiring is disconnected, shorted or grounded, replace the wiring. 6. Replace the punch slide motor.
  Punch slide sensor 1. Execute U241 Punch - Punch HP to check the finisher switch. 2. Check that the sensor and its mounting bracket are correctly positioned. 3. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Punch slide sensor and Punch PWB (YC6) 4. Replace the punch slide sensor.
  Punch PWB 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Punch PWB (YC1) and DF main PWB (YC7) (4000-sheet finisher) 2. Replace the punch PWB.
  DF main PWB Replace the DF main PWB

• Code: 8420
• Description: Punch slide motor error 2 In detection of paper edges, the paper edge cannot be detected in 30 mm move.
• Remedy: Punch slide motor 1. Execute U240 Booklet - Punch Move to check the finisher operation. 2. Manipulate the punch slide part of the punch unit back and forth to check it can smoothly move. 3. Check that the drive from the motor reaches punch part. 4. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Punch slide motor and Punch PWB (YC3) 5. If the wiring is disconnected, shorted or grounded, replace the wiring. 6. Replace the punch slide motor.
  Punch paper edge sensor 1,2 1. Execute U241 Punch - Edge Face 1,2,3,4 to check the finisher switch. 2. Check that the sensor and its mounting bracket are correctly positioned. 3. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Punch paper edge sensor 1,2 and Punch PWB (YC5,YC7) 4. Replace the punch paper edge sensor 1,2.
  Punch PWB 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Punch PWB (YC1) and DF main PWB (YC7) (4000-sheet finisher) 2. Replace the Punch PWB.
  DF main PWB Replace the DF main PWB

• Code: 8430
• Description: Punch unit communication error Communication with the punch unit is not possible.
• Remedy: Punch PWB 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Punch PWB (YC1) and DF main PWB (YC7) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the Punch PWB.
  DF main PWB Replace the DF main PWB

• Code: 8500
• Description: Mailbox communication error Communication failed to be established after the mailbox was hooked up.
• Remedy: MB main PWB 1. Turn the main power switch off and after 5 seconds, turn it on. 2. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. MB main PWB (YC3) and DF main PWB (YC6) 3. If the wiring is disconnected, shorted or grounded, replace the wiring. 4. Replace the MB main PWB
  DF main PWB Replace the DF main PWB

• Code: 8510
• Description: MB conveying motor error 1 When initial operation, MB home position sensor does not turn on within 5 s.
• Remedy: MB conveying motor 1. If the transfer roller won’t rotate smoothly, repair its mechanism. 2. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. MB conveying motor and MB main PWB (YC5) 3. If the wiring is disconnected, shorted or grounded, replace the wiring. 4. Replace the MB conveying motor.
  MB home position sensor 1. Execute U241 Mail Box - Motor HP to check the finisher switch. 2. Check that the sensor and its mounting bracket are correctly positioned. 3. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. MB home position sensor and MB main PWB (YC2) 4. Replace the MB home position sensor.
  MB main PWB Replace the MB main PWB

• Code: 8520
• Description: MB conveying motor error 2 When standby operation, MB home position sensor does not turn off within 1 s.
• Remedy: MB conveying motor 1. Execute Mail Box - Conv of U240 finisher operation check. 2. Manipulate the conveying roller of the mailbox to check it can smoothly rotate. 3. Check that the drive from the motor reaches the conveying roller. 4. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. MB conveying motor and MB main PWB (YC5) 5. If the wiring is disconnected, shorted or grounded, replace the wiring. 6. Replace the MB conveying motor.
  MB home position sensor 1. Execute U241 Mail Box - Motor HP to check the finisher switch. 2. Check that the sensor and its mounting bracket are correctly positioned. 3. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. MB home position sensor and MB main PWB (YC2) 4. Replace the MB home position sensor.
  MB main PWB Replace the MB main PWB

• Code: 8800
• Description: Document finisher main program error Document finisher main program error at power up.
• Remedy: DF main PWB 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. DF main PWB (YC4) and Engine PWB (YC18) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the DF main PWB
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 8900
• Description: Document finisher backup error Read and write data does not match 3 times in succession.
• Remedy: DF main PWB 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. DF main PWB (YC4) and Engine PWB (YC18) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the DF main PWB