• Code: 7800
• Description: Broken outer temperature sensor wire
  The device did not respond for more than 5 ms during reading, in 5 times.
• Causes: Defective connector cable or poor contact in the connector.
  Defective outer temperature sensor.
  Defective engine 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. Outer temperature sensor and front PWB (YC8) Front PWB (YC2) and engine PWB (YC8)
  Defective outer temperature sensor. Replace outer temperature sensor.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7901
• Description: Drum 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.
• Causes: Defective connector cable or poor contact in the connector.
  Defective drum 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. Drum PWB and front PWB (YC6) Front PWB (YC2) and engine PWB (YC8)
  Defective drum PWB. Replace the drum unit.

• Code: 7911
• Description: Developer unit 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.
• Causes: Defective connector cable or poor contact in the connector.
  Defective developer unit.
• 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. Developer unit and front PWB (YC7) Front PWB (YC2) and engine PWB (YC8)
  Defective developer unit. Replace the developer unit.

• Code: 7941
• Description: Laser scanner unit EEPROM error
  Mismatch of reading data from two locations occurs 8 times successively. Mismatch between writing data and reading data occurs 8 times successively.
• Causes: Defective connector cable or poor contact in the connector.
  Defective APC 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. APC PWB and LSU relay PWB (YC3) LSU relay PWB (YC2) and engine PWB (YC11)
  Defective APC PWB. Replace the laser scanner unit.

• Code: 8000
• Description: Finisher incompatible detection error
  The finisher has been installed with a device to which it is incompatible.
• Causes: The finisher is installed with a device to which it is incompatible.
• Remedy: 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.
• Causes: Defective connector cable or poor contact in the connector.
  Defective punch home position sensor.
  Defective punch 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 motor and punch PWB (YC4) Punch home position sensor and punch PWB (YC8) Punch PWB (YC1) and DF main PWB (YC7)
  Defective punch home position sensor. Replace the punch home position sensor.
  Defective punch motor. Replace the punch motor.
  Defective PWB. Replace the punch PWB or DF main PWB and check for correct operation.

• Code: 8020
• Description: Punch motor error 2
  Home position is not obtained in 3 seconds after home position is initialized or in standby.
• Causes: Defective connector cable or poor contact in the connector.
  Defective punch 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 motor and punch PWB (YC4) Punch PWB (YC1) and DF main PWB (YC7)
  Defective punch motor. Replace the punch motor.
  Defective PWB. Replace the punch PWB or DF main PWB and check for correct operation.

• Code: 8030
• Description: Punch motor error 3
  Home position does not turn from On to Off in 50 ms after home position has been initialized.
• Causes: Defective connector cable or poor contact in the connector.
  Defective punch 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 motor and punch PWB (YC4) Punch PWB (YC1) and DF main PWB (YC7)
  Defective punch motor. Replace the punch motor.
  Defective PWB. Replace the punch PWB or DF main PWB and check for correct operation.