• Code: 6750
• Description: Fuser IH output over-current error
  The output current is greater than 90A for 10 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: 6760
• Description: Fuser IH input over-current error
  The input current is greater than 20A(100V/120V), 10A(200V) for 100 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: 6770
• Description: Fuser IH low electric power error
  The preset power is less than 0.6 times of it for 120 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 belt cooling fan error
  When the fuser edge fan motor 1 , 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 1 or 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, replace the cable. Fuser edge fan motor 1 and front PWB (YC26) Fuser edge fan motor 2 and fuser PWB (YC2) Fuser PWB (YC1) and engine PWB (YC26)
  Defective fuser edge fan motor 1 or 2. Replace the fuser edge fan motor 1 or 2.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6910
• Description: Engine software ready error
  The device won’t engage in ready state in 60 minutes after warming-up has began.
• Causes: Defective engine software. Defective engine PWB.
• Remedy: Defective engine software. Install the engine software.
  Defective engine PWB. Replace the engine PWB and check for correct operation(see page 1-5-49).

• Code: 6920
• 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 engine PWB (YC26)
  Defective fuser front fan motor. Replace fuser front fan motor.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6930
• 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, Fuser rear fan motor and fuser PWB (YC2) Fuser PWB (YC1) and engine PWB (YC26)
  Defective fuser rear fan motor. Replace fuser rear fan motor.
  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.