• Code: 6330
• Description: Broken fuser thermistor 3 wire
  Fuser thermistor 3 detects a temperature lower than 20C/ 68F continuously for 1 s
• Causes: Defective connector cable or poor contact in the connector.
  Deformed connector pin.
  Defective triac.
  Broken fuser thermistor 3 wire.
  Fuser thermostat triggered.
  Defective fuser IH.
  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)
  Broken fuser thermistor 3 wire. Replace the fuser unit.
  Fuser thermostat triggered. Replace the fuser unit.
  Defective fuser IH. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6520
• Description: Abnormally high fuser thermistor 4 temperature
  Fuser thermistor 4 detects a temperature higher than 215C/419F for 1 s.
• Causes: Deformed connector pin.
  Defective triac.
  Shorted fuser thermistor 4.
  Defective engine PWB.
• Remedy: Shorted fuser thermistor 4. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6530
• Description: Broken fuser thermistor 4 wire
  Fuser thermistor 4 detects a temperature lower than 20C/ 68F continuously for 1 s
• Causes: Defective connector cable or poor contact in the connector.
  Deformed connector pin
  Defective triac.
  Broken fuser thermistor 4 wire.
  Fuser thermostat triggered.
  Defective fuser IH.
  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)
  Broken fuser thermistor 4 wire. Replace the fuser unit.
  Fuser thermostat triggered. Replace the fuser unit.
  Defective fuser IH. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6600
• Description: Fuser belt rotation error
  A belt rotating pulse is not received for 1 second. (Engine CPU)
• 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: 6610
• Description: Fuser release motor error
  When the fuser release motor is driven, the fuser release sensor does not turn on/off for 5 s.
• Causes: Defective connector cable or poor contact in the connector.
  Defective drive transmission system of motor.
  Defective fuser release 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 unit and engine PWB (YC26)
  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 fuser release motor. Replace the fuser release motor.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• 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 eject PWB.
  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 eject PWB (YC4) Eject PWB (YC1) and front PWB (YC10) Front PWB (YC9) and engine PWB (YC9)
  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 eject PWB. Replace the eject PWB and check for correct operation.
  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 2 s.
• Causes: Defective connector cable or poor contact in the connector.
  Defective fuser belt sensor.
  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 unit and engine PWB (YC26)
  Defective fuser belt sensor. Replace the fuser belt sensor.
  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.