• Code: 6620
• Description: IH core motor error
  When the IH core motor is driven, the IH core sensor does not turn off for 5 s.
• Causes: Defective connector cable or poor contact in the connector.
  Defective drive transmission system of motor.
  Defective IH core motor.
  Defective front 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. IH core motor and front PWB (YC10) Front PWB (YC3) and engine PWB (YC7)
  Defective drive transmission system of motor. Check if the gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective IH core motor. Replace the IH core motor.
  Defective front PWB. Replace the front PWB and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6710
• Description: Fuser IH PWB CPU reset error
  Watch doc timer has been overflowed.
• 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: 6720
• Description: Fuser IH belt rotation error
  A belt rotating pulse is not received for 1 second.
• Causes: Defective connector cable or poor contact in the connector.
  Defective fuser belt 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. Fuser unit and engine PWB (YC26)
  Defective fuser belt sensor. Replace the fuser belt sensor.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6730
• Description: Abnormally high fuser IH PWB temperature 1
  The input detect temperature is greater than 105°C/221 °F.
• 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: 6740
• Description: Abnormally high fuser IH PWB temperature 2
  The input detect temperature is greater than 105°C/221 °F.
• 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: 6750
• Description: Fuser IH output over-current error
  The output current is greater than 75A 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 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.