• Code: 4203
• Description: BD steady-state error M
  The BD signal is not detected.
• Causes: PD PWB M (LSU). Engine PWB
• Remedy: PD PWB M (LSU) 1. Confirm that the FCC wiring connector is not distorted and connect the FCC wiring all the way in. Laser scanner unit and LSU relay PWB (YC2) LSU relay PWB (YC10) and Engine PWB (YC13) 2. If the FCC wiring is disconnected, replace the FCC wiring. 3. Replace the laser scanner unit.
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 4204
• Description: BD steady-state error Y
  The BD signal is not detected.
• Causes: PD PWB Y (LSU). Engine PWB
• Remedy: PD PWB Y (LSU) 1. Confirm that the FCC wiring connector is not distorted and connect the FCC wiring all the way in. Laser scanner unit and LSU relay PWB (YC4) LSU relay PWB (YC10) and Engine PWB (YC13) 2. If the FCC wiring is disconnected, replace the FCC wiring. 3. Replace the laser scanner unit.
  Engine PWB 1. Check the engine software and upgrade to the latest, if necessary. 2. Replace the engine PWB.

• Code: 4600
• Description: LSU cleaning motor error
  When the LSU cleaning motor is driven, an error signal is detected continuously for 2 s.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system. Defective motor. Defective PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity of the connector cable. If none, replace the cable. LSU cleaning motor and LSU connect PWB(YC11) LSU connect PWB and engine PWB(YC14)
  Defective drive transmission system. Check if the rollers and gears rotate smoothly. If not, grease the bushings and gears. Check for broken gears and replace if any.
  Defective motor. Replace the LSU cleaning motor.
  Defective PWB. Replace the engine PWB or LSU connect PWB check for correct operation.

• Code: 6000
• Description: Broken fuser heater wire
  Fuser thermistor 2 does not reach 80° C/176 °F even after20 s during warming up. The detected temperature of fuser thermistor2 does not reach the specified temperature (ready indication temperature) for 200 s in warming up after reached to 80° C/176 °F.
• Causes: Defective connector cable or poor contact in the connector. Deformed connector pin. Fuser thermostat triggered. Broken fuser heater wire. Defective 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 coil unit and IHPWB IHPWB and engine PWB (YC30)
  Deformed connector pin. If the I/F connector pins of the fuser unit and the main unit are deformed owing to foreign matters, such as paper dusts, replace the connectors or the units including the connectors.
  Broken fuser heater wire. Fuser thermostat triggered. Reinsert the fuser unit.
  Defective PWB. Replace the IH PWB or the engine PWB and check for correct operation.

• Code: 6020
• Description: Abnormally high fuser thermistor 2 (center) temperature
  The fuser thermistor 2 detects a temperature higher than 240°C/464°F continuously for 1 s
• Causes: Deformed connector pin. Shorted fuser thermistor. Defective PWB.
• Remedy: Deformed connector pin. If the I/F connector pins of the fuser unit and the main unit are deformed owing to foreign matters, such as paper dusts, replace the connectors or the units including the connectors.
  Shorted fuser thermistor. Replace the fuser unit.
  Defective PWB. Replace the engine PWB and check for correct operation.

• Code: 6030
• Description: Fuser thermistor 2 (center) break error
  A/D value of the fuser thermistor 2 exceeds 1010 bit continuously for 1 s during warming up.
• Causes: Defective connector cable or poor contact in the connector. Deformed connector pin. Defective fuser thermistor. Defective 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 thermister2 and fuser PWB (YC2) Fuser unit and engine PWB (YC30)
  Deformed connector pin. If the I/F connector pins of the fuser unit and the main unit are deformed owing to foreign matters, such as paper dusts, replace the connectors or the units including the connectors.
  Defective fuser thermistor. Replace the fuser unit.
  Defective PWB. Replace the engine PWB and check for correct operation.

• Code: 6040
• Description: NC sensor error
• Causes: Deformed connector pin. Shorted fuser thermistor. Defective PWB.
• Remedy: Deformed connector pin. If the I/F connector pins of the fuser unit and the main unit are deformed owing to foreign matters, such as paper dusts, replace the connectors or the units including the connectors.
  Shorted fuser thermistor. Replace the fuser unit.
  Defective PWB. Replace the engine PWB and check for correct operation.

• Code: 6050
• Description: Abnormally low fuser thermistor 2 (center) temperature
  The fuser temperature lower than 100 °C/212 °F is detected continuously for 1 s during printing.
• Causes: Deformed connector pin. Defective fuser thermistor. Defective fuser heater. Defective PWB.
• Remedy: Deformed connector pin. If the I/F connector pins of the fuser unit and the main unit are deformed owing to foreign matters, such as paper dusts, replace the connectors or the units including the connectors.
  Defective fuser heater. Defective fuser thermistor. Replace the fuser unit.
  Defective PWB. Replace the engine PWB and check for correct operation.