• Code: 6780
• Description: Fuser IH input over-voltage error
  The input voltage is greater than 140V for 200 ms in succession.
• Causes: Defective connector cable or poor contact in the connector.
  Defective fuser IH PWB.
  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. Fuser IH PWB (YC4) and engine PWB (YC26)
  Defective fuser IH PWB. Replace the fuser IH PWB and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6900
• Description: Fuser front fan motor error
  When the fuser front fan motor is driven, alarm signal is detected for 5 s continuously.
• Causes: Defective connector cable or poor contact in the connector.
  Defective fuser front fan motor.
  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. Fuser front fan motor and front PWB (YC4) Front PWB (YC3) and engine PWB (YC7)
  Defective fuser front fan motor. Replace the fuser front fan motor.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6910
• Description: Fuser rear fan motor error
  When the fuser rear fan motor is driven, alarm signal is detected for 5 s continuously.
• Causes: Defective connector cable or poor contact in the connector.
  Defective fuser rear fan motor.
  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. Fuser rear fan motor and engine PWB (YC26)
  Defective fuser rear fan motor. Replace the fuser rear fan motor.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6920
• Description: Fuser edge fan motor 1 error
  When the fuser edge fan motor 1 is driven, alarm signal is detected for 5 s continuously.
• Causes: Defective connector cable or poor contact in the connector.
  Defective fuser edge fan motor 1.
  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. Fuser edge fan motor and engine PWB (YC26)
  Defective fuser edge fan motor 1. Replace fuser edge fan motor 1
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6930
• Description: Fuser edge fan motor 2 error
  When the fuser edge fan motor 2 is driven, alarm signal is detected for 5 s continuously.
• Causes: Defective connector cable or poor contact in the connector.
  Defective fuser edge fan motor 2.
  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, Fuser edge fan motor 2 and fuser PWB (YC2) Fuser PWB (YC1) and engine PWB (YC26)
  Defective fuser edge fan motor 2. Replace fuser edge fan motor 2.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6940
• Description: IH fan motor error
  When the IH fan motor is driven, the alarm signal is detected for 5 s continuously.
• Causes: Defective connector cable or poor contact in the connector.
  Defective IH fan motor.
  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. IH fan motor and feed PWB 1 (YC11) Feed PWB 1 (YC2) and engine PWB (YC5)
  Defective IH fan motor. Replace the IH fan motor.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6950
• Description: Fuser IH PWB communication error
  No response is received in 30 ms since a command is sent to IHCPU. A checksum error is detected 10 times in succession.
• Causes: Defective connector cable or poor contact in the connector.
  Defective fuser IH PWB.
  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. Fuser IH PWB (YC4) and engine PWB (YC26)
  Defective fuser IH PWB. Replace the fuser IH PWB and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6960
• Description: Current PWB error
  Less than 1A is continuously observed for 5 seconds.
• Causes: Defective current PWB.
• Remedy: Replace the current PWB and check for correct operation.