• Code: 6000
• Description: Broken fuser heater wire (Center)
  (50/60 ppm model) Fuser thermistor 2 detects a temperature less than 100°C/ 212°F continuously for 30 s after a warm-up start. (40 ppm model) Fuser thermistor 1 detects a temperature less than 100°C/ 212°F continuously for 30 s after a warm-up start.
• Causes: Fuser unit. Fuser thermistor connect PWB. Control PWB. Power source PWB. Fuser heater.
• Remedy: Fuser unit 1. Check that no paper jam is present. 2. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Fuser unit and fuser thermistor connect PWB (YC2) Fuser thermistor connect PWB and control PWB (YC21) 3. If the wiring is disconnected, shorted or grounded, replace the wiring. 4. Replace the Fuser unit. (Deteriorated sensitivity due to the toner adhered to the center thermistor.)
  Fuser thermistor connect PWB Replace the fuser thermistor connect PWB.
  Control PWB 1. Check the control software and upgrade to the latest, if necessary. 2. Replace the control PWB and check for correct operation.
  Power source PWB 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Power source PWB and connect right PWB (YC4) Connect right PWB and control PWB (YC1) 2. Replace the power source PWB.
  Fuser heater 1. Replace the Fuser unit.

• Code: 6020
• Description: Abnormally high fuser thermistor 2 temperature (Center)
  (50/60 ppm model only) Fuser thermistor 2 detects a temperature higher than 235°C/455°F. In a heater-off state, the detection temperature of fuser thermistor 2 is higher than 195°C/383°F after the detection temperature of fuser thermistor 2 was 155°C/311°F or less.
• Causes: Fuser unit. Fuser thermistor connect PWB. Control PWB.
• Remedy: Fuser unit 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Fuser unit and fuser thermistor connect PWB (YC2) Fuser thermistor connect PWB and control PWB (YC21) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the Fuser unit.
  Fuser thermistor connect PWB Replace the fuser thermistor connect PWB.
  Control PWB 1. Check the control software and upgrade to the latest, if necessary. 2. Replace the control PWB and check for correct operation.

• Code: 6030
• Description: Broken fuser thermistor 2 wire (Center)
  (50/60 ppm model only) Input from fuser thermistor 2 is 1019 or more (A/D value) continuously for 4 s.
• Causes: Fuser unit. Fuser thermistor connect PWB. Control PWB. Fuser thermistor 2. Fuser thermostat (triggered). Power source PWB
• Remedy: Fuser unit 1. Check that no paper jam is present. 2. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Fuser unit and fuser thermistor connect PWB (YC2) Fuser thermistor connect PWB and control PWB (YC21) 3. If the wiring is disconnected, shorted or grounded, replace the wiring. 4. Replace the Fuser unit. (Deteriorated sensitivity due to the toner adhered to the center thermistor.)
  Fuser thermistor connect PWB Replace the fuser thermistor connect PWB.
  Control PWB 1. Check the control software and upgrade to the latest, if necessary. 2. Replace the control PWB.
  Fuser thermistor 2 1. Replace the Fuser unit.
  Fuser thermostat (triggered) 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Fuser unit and power source PWB (YC2) 2. If the wiring is disconnected, shorted or grounded, replace the wiring. 3. Replace the Fuser unit.
  Power source PWB Replace the power source PWB.

• Code: 6120
• Description: Abnormally high fuser thermistor 1 temperature
  (50/60 ppm model) The detection temperature of fuser thermistor 1 is higher than 245°C/473°F. In a heater-off state, the detection temperature of fuser thermistor 1 is higher than 195°C/383°F after the detection temperature of fuser thermistor 1 was 155°C/311°F or less. (40 ppm model) The detection temperature of fuser thermistor 1 is higher than 250°C/482°F. In a heater-off state, the detection temperature of fuser thermistor 1 is higher than 170°C/338°F after the detection temperature of fuser thermistor 1 was 155°C/311°F or less.
• Causes: Connector pin. Triac. Fuser thermistor. Contrl PWB.
• Remedy: Fuser thermistor Replace the fuser unit.
  Contrl PWB Replace the control PWB and check for correct operation.

• Code: 6130
• Description: Broken fuser thermistor 1 wire (50/60 ppm model only)
  A/D value of the fuser thermistor 1 exceeds 1019 bit continuously for 4 s during warming up.
• Causes: Connector cable or poor contact in the connector. Connector pin. Triac. Fuser thermistor. Fuser thermistor connect PWB. Control PWB.
• Remedy: 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 thermistor and fuser thermistor connect PWB (YC1) Fuser thermistor connect PWB and control PWB (YC21)
  Fuser thermistor Replace the fuser unit.
  Fuser thermistor connect PWB Replace the fuser thermistor connect PWB.
  Control PWB Replace the control PWB and check for correct operation.

• Code: 6400
• Description: Zero-cross signal error
  While fuser heater ON/OFF control is performed, the zerocross signal is not input within 2 s.
• Causes: Fuser unit. Power source PWB. Connect right PWB. Control PWB.
• Remedy: Fuser unit 1. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Power source PWB and connect right PWB (YC4) Connect right PWB and control PWB (YC29) 2. If the wiring is disconnected, shorted or grounded, replace the wiring.
  Power source PWB Replace the power source PWB.
  Connect right PWB Replace the connect right PWB.
  Control PWB Replace the control PWB.

• Code: 7000
• Description: Toner motor error
  During driving the toner motor, an over-current detection signal is detected at intervals of 10 ms as for 300 accumulation.
• Causes: Connector cable or poor contact in the connector. Drum unit. Connect left PWB. Control PWB.
• Remedy: Connector cable or poor contact in the connector Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Toner motor and drum PWB (YC4) Drum PWB and drum connect PWB (YC1) Drum connect PWB and connect left PWB (YC3) Connect left PWB and control PWB (YC3)
  Drum unit Replace the drum unit.
  Connect left PWB Replace the connect left PWB.
  Control PWB Replace the control PWB and check for correct operation.

• Code: 7100
• Description: Toner sensor error
  Sensor output value of 930 or more continuously for 5 s.
• Causes: Toner sensor. Toner motor. Connect left PWB. Control PWB.
• Remedy: Toner sensor 1. Check the toner sensor output. 2. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Toner sensor and drum PWB (YC3) Drum PWB and drum connect PWB (YC1) Drum connect PWB and connect left PWB (YC3) Connect left PWB and control PWB (YC3) 3. If the wiring is disconnected, shorted or grounded, replace the wiring. 4. Check that the gears of the Developer unit are not damaged and the spiral can rotate. 5. Replace the Developer unit.
  Toner motor 1. Draw out the toner container. 2. Check the drive gear can rotate or they are not unusually loaded and, if necessary, replace. 3. Confirm that the wiring connector is firmly connected and, if necessary, connect the connector all the way in. Toner motor and drum PWB (YC4) Drum PWB and drum connect PWB (YC1) Drum connect PWB and connect left PWB (YC3) Connect left PWB and control PWB (YC3) 4. If the wiring is disconnected, shorted or grounded, replace the wiring. 5. Replace the Toner motor.
  Connect left PWB Replace the connect left PWB.
  Control PWB 1. Check the control software and upgrade to the latest, if necessary. 2. Replace the control PWB and check for correct operation.