• Code: 5100
• Description: Main charger high-voltage error
  Five pages have been printed with the main charger output short-circuited.
• Causes: Drum unit installed incorrectly. Engine PWB installed incorrectly. Defective engine PWB.
• Remedy: Drum unit installed incorrectly. Verify harness is not pinched.
  Engine PWB installed incorrectly. Verify harness is not pinched.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6000
• Description: Broken fuser heater wire
  The temperature does not reach 100°C/212°F after the fuser heater has been turned on continuously for 30 s. The temperature does not rise by 1°C/1.8°F after the fuser heater lamp has been turned on continuously for 15 s during warm-up or at standby.(Only when the detection temperature is less than 200°C.)
• Causes: Defective connector cable or poor contact in the connector. Fuser thermostat triggered. Broken fuser heater wire.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, remedy or replace the cable. Fuser heater and power source PWB (YC102) Fuser unit and engine PWB (YC506)
  Fuser thermostat triggered. Reinsert the fuser unit.
  Broken fuser heater wire. Replace the fuser unit.

• Code: 6020
• Description: Abnormally high fuser thermistor 2 temperature
  The temperature of the fuser thermistor 2 detects 250°C/482°F or more continuously for 3 s.
• Causes: Shorted fuser thermistor 2. Defective engine PWB.
• Remedy: Shorted fuser thermistor 2. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6030
• Description: Broken fuser thermistor 2 wire
  average AD value input from fuser thermistor 2 for 1.8 seconds is less than one. (Only when the detection temperature is 50°C or more.)
• Causes: Defective connector cable or poor contact in the connector. Broken fuser thermistor 2 wire. Fuser thermostat triggered. Broken fuser heater wire.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, remedy or replace the cable. Fuser unit and engine PWB (YC506)
  Broken fuser thermistor 2 wire. Replace the fuser unit.
  Fuser thermostat triggered. Reinsert the fuser unit.
  Broken fuser heater wire. Replace the fuser unit.

• Code: 6220
• Description: Abnormally high fuser thermistor 1 temperature
  The temperature of the fuser thermistor 1 detects 255°C/491°F or more continuously for 3 s.
• Causes: Shorted fuser thermistor 1. Defective engine PWB.
• Remedy: Shorted fuser thermistor 1. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6230
• Description: Broken fuser thermistor 1 wire
  average AD value input from fuser thermistor 1 for 1.8 seconds is less than one.
• Causes: Defective connector cable or poor contact in the connector. Broken fuser thermistor 1 wire. Fuser thermostat triggered. Broken fuser heater wire.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, remedy or replace the cable. Fuser unit and engine PWB (YC506)
  Broken fuser thermistor 1 wire. Replace the fuser unit.
  Fuser thermostat triggered. Reinsert the fuser unit.
  Broken fuser heater wire. Replace the fuser unit.

• Code: 6400
• Description: Zero-cross signal error
  The zero-cross signal does not reach the engine PWB for more than 2 s.
• Causes: Defective connector cable or poor contact in the connector. Defective power source 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, remedy or replace the cable. Power source PWB (YC103) and connect-L PWB (YC1) Connect-L PWB (YC8) and engine PWB (YC503)
  Defective power source PWB. Replace the power source PWB and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7000
• Description: Toner motor lock error
  During driving the toner motor, a motor overcurrent signal is detected for 5 s.
• Causes: Lump of toner inside toner container. Defective drive transmission system of the toner motor. Defective toner motor. Defective engine PWB.
• Remedy: Lump of toner inside toner container. Replace the toner container.
  Defective drive transmission system of the toner motor. Replace the developing unit.
  Defective toner motor. Replace the developing unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.