• Code: 7914
• Description: Developer unit Y EEPROM error No response is issued from the device in reading/writing for 5 ms or more and this problem is repeated five times successively. Mismatch of reading data from two locations occurs 8 times successively. Mismatch between writing data and reading data occurs 8 times successively.
• Remedy: Developer unit Y 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Developer unit Y and Front PWB (YC15) Front PWB (YC2) and Engine PWB (YC10) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the Developer unit Y.
  Front PWB Replace the front PWB
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 7941
• Description: Laser scanner unit K EEPROM error Mismatch of reading data from two locations occurs 8 times successively. Mismatch between writing data and reading data occurs 8 times successively.
• Remedy: APC PWB K 1. Confirm that the FFC wiring connector is not distorted and connect the FFC wiring all the way in. APC PWB K and LSU relay PWB (YC5) LSU relay PWB (YC2) and Engine PWB (YC11) 2. If the FFC wiring is disconnected, shorted or grounded, replace the FFC wiring. 3. Replace the laser scanner unit.
  LSU relay PWB Replace the LSU relay PWB.
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 7942
• Description: Laser scanner unit C EEPROM error Mismatch of reading data from two locations occurs 8 times successively. Mismatch between writing data and reading data occurs 8 times successively
• Remedy: APC PWB C 1. Confirm that the FFC wiring connector is not distorted and connect the FFC wiring all the way in. APC PWB C and LSU relay PWB (YC10) LSU relay PWB (YC2) and Engine PWB (YC11) 2. If the FFC wiring is disconnected, shorted or grounded, replace the FFC wiring. 3. Replace the laser scanner unit.
  LSU relay PWB Replace the LSU relay PWB.
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 7943
• Description: Laser scanner unit M EEPROM error Mismatch of reading data from two locations occurs 8 times successively. Mismatch between writing data and reading data occurs 8 times successively.
• Remedy: APC PWB M 1. Confirm that the FFC wiring connector is not distorted and connect the FFC wiring all the way in. APC PWB M and LSU relay PWB (YC8) LSU relay PWB (YC2) and Engine PWB (YC11) 2. If the FFC wiring is disconnected, shorted or grounded, replace the FFC wiring. 3. Replace the laser scanner unit.
  LSU relay PWB Replace the LSU relay PWB.
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 7944
• Description: Laser scanner unit Y EEPROM error Mismatch of reading data from two locations occurs 8 times successively. Mismatch between writing data and reading data occurs 8 times successively.
• Remedy: APC PWB Y 1. Confirm that the FFC wiring connector is not distorted and connect the FFC wiring all the way in. APC PWB Y and LSU relay PWB (YC12) LSU relay PWB (YC2) and Engine PWB (YC11) 2. If the FFC wiring is disconnected, shorted or grounded, replace the FFC wiring. 3. Replace the laser scanner unit.
  LSU relay PWB Replace the LSU relay PWB.
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 8000
• Description: Finisher incompatible detection error The finisher has been installed with a device to which it is incompatible.
• Remedy: The finisher is installed with a device to which it is incompatible. The finisher must be installed with the devices to which it is compatible.

• Code: 8010
• Description: Punch motor error 1 When the punch motor is driven, punch home position sensor does not turn on within 200 ms.
• Remedy: Punch motor 1. Execute U240 Motor - Punch to check the finisher operation. 2. Manipulate the punch up and down to check it can smoothly move up and down. 3. Check that the drive from the motor reaches the punch cam. 4. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Punch motor and Punch PWB (YC4) 5. If the wiring is disconnected, shorted or grounded, replace the wiring. 6. Replace the punch motor.
  Punch home position 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 home position sensor and Punch PWB (YC8) 4. Replace the Punch home position 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) 2. Replace the punch PWB.
  DF main PWB Replace the DF main PWB (Refer to the service manual for the document finisher).

• Code: 8020
• Description: Punch motor error 2 Home position is not obtained in 3 s after home position is initialized or in standby.
• Remedy: Punch motor 1. Execute U240 Motor - Punch to check the finisher operation. 2. Manipulate the punch up and down to check it can smoothly move up and down. 3. Check that the drive from the motor reaches the punch cam. 4. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Punch motor and Punch PWB (YC4) 5. If the wiring is disconnected, shorted or grounded, replace the wiring. 6. Replace the punch motor.
  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. Replace the punch PWB.
  DF main PWB Replace the DF main PWB (Refer to the service manual for the document finisher).