• Code: 6050
• Description: Abnormally low fuser thermistor 1 temperature
  Fuser thermistor 1 detects a temperature lower than 100°C/212°F for 1 s after warming up, during ready or during print. Fuser thermistor 1 detects a temperature lower than 70°C/ 158°F for 1 s during low power mode.
• Causes: Defective connector cable or poor contact in the connector. Defective fuser thermistor 1. 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)
  Defective fuser thermistor 1. Replace the fuser unit.
  Defective fuser IH. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6120
• Description: Abnormally high fuser thermistor 4 temperature
  Fuser thermistor 4 detects a temperature higher than 190°C/374°F for 1 s.
• Causes: Defective connector cable or poor contact in the connector. Shorted fuser thermistor 4. 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)
  Shorted fuser thermistor 4. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6130
• Description: Broken fuser thermistor 4 wire
  Input from fuser thermistor 4 is 992 or more (A/D value) continuously for 60 s.
• Causes: Defective connector cable or poor contact in the connector. Broken fuser thermistor 4 wire. Defective fuser IH.
• 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.
  Defective fuser IH. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6150
• Description: Abnormally low fuser thermistor 4 temperature
  Fuser thermistor 4 detects a temperature lower than 30°C/ 86°F for 1 s after warming up.
• Causes: Defective connector cable or poor contact in the connector. Defective fuser thermistor 4. 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)
  Defective fuser thermistor 4. Replace the fuser unit.
  Defective fuser IH. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6200
• Description: Broken fuser edge heater wire
  Fuser thermistor 2 does not reach 100° C/212 °F even after 60 s during warming up. The detected temperature of fuser thermistor 2 does not reach the specified temperature (ready indication temperature) for 420 s in warming up after reached to 100° C/212 °F.
• Causes: Defective connector cable or poor contact in the connector. 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. Power source PWB (YC3) and fuser IH PWB (YC1) Fuser IH PWB (YC4) and engine PWB (YC26)
  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: 6220
• Description: Abnormally high fuser thermistor 2 temperature
  Fuser thermistor 2 detects a temperature higher than 245°C/473°F for 1 s.
• Causes: Defective connector cable or poor contact in the connector. Shorted fuser thermistor 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 unit and engine PWB (YC26)
  Shorted fuser thermistor 2. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6230
• Description: Broken fuser thermistor 2 wire
  The Input signal from the fuser thermistor 2 is 992 or more (A/D value) continuously for 1 s when the temperature at the fuser thermistor 1 is greater than 100°C/212°F during warming up.
• Causes: Defective connector cable or poor contact in the connector. Broken fuser thermistor 2 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 2 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: 6250
• Description: Abnormally low fuser thermistor 2 temperature
  Fuser thermistor 2 detects a temperature lower than 100°C/212°F for 1 s during ready or print. Fuser thermistor 2 detects a temperature lower than 50°C/ 122°F for 1 s during warming up.
• Causes: Defective connector cable or poor contact in the connector. Defective fuser thermistor 2. 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)
  Defective fuser thermistor 2. Replace the fuser unit.
  Defective fuser IH. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.