• Code: 8430
• Description: Punch unit communication error Communication with the punch unit is not possible
• Causes: Punch PWB. DF main PWB
• 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) (3000-sheet finisher) Punch PWB (YC1) and DF main PWB (YC8) (1000-sheet finisher) 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 (3000-sheet finisher) Communication failed to be established after the mailbox was hooked up.
• Causes: MB main PWB. DF main PWB
• 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 (3000-sheet finisher) When initial operation, MB home position sensor does not turn on within 5 s.
• Causes: MB conveying motor. MB home position sensor. MB main PWB
• 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 (3000-sheet finisher) When standby operation, MB home position sensor does not turn off within 1 s.
• Causes: MB conveying motor. MB home position sensor. MB main PWB
• 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
• Causes: DF main PWB. Engine PWB
• 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) (3000-sheet finisher) DF main PWB (YC7) and Engine PWB (YC18) (1000-sheet finisher) 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
• Causes: DF main PWB
• Remedy: 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) (3000-sheet finisher) DF main PWB (YC7) and Engine PWB (YC18) (1000-sheet finisher) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the DF main PWB.

• Code: 8990
• Description: DF Setup error When a bridge unit is undetectable in the state where DF is connected. When a bridge unit is detected in the state where DF is not connected.
• Causes: Bridge unit Document finisher. DF main PWB. Engine PWB
• Remedy: Bridge unit Document finisher 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) (3000-sheet finisher) DF main PWB (YC7) and Engine PWB (YC18) (1000-sheet finisher) 2. If the wiring is disconnected, shorted or grounded, replace the wiring.
  DF main PWB Replace the DF main PWB.
  Engine PWB Replace the engine PWB.

• Code: 9000
• Description: Document processor communication error Communication with the document processor is not possible.
• Causes: DP main PWB. Engine PWB
• Remedy: DP main PWB 1. Check that the versions of the main unit firmware and the DP firmware are identical. 2. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. DP main PWB(YC1) and Engine PWB(YC33) Engine PWB (YC3) and Main PWB (YC64) 3. If the wiring is disconnected, shorted or grounded, replace the wiring. 4. Replace the DP main PWB
  Engine PWB Replace the engine PWB.