• Code: 4600
• Description: LSU cleaning motor error
  When the LSU cleaning motor is driven, the LSU cleaning motor over-current detection signal is detected continuously for 50 times (5 s) at 100 ms intervals.
• Causes: Defective harness between LSU cleaning motor and engine PWB (YC37), or improper connector insertion. Defective drive transmission system of the LSU cleaning motor. Defective LSU cleaning motor. Defective engine PWB.
• Remedy: Defective harness between LSU cleaning motor and engine PWB (YC37), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness.
  Defective drive transmission system of the LSU cleaning motor. Check if the rollers and gears rotate smoothly. If not, grease the bushings and gears. Check for broken gears and replace if any.
  Defective LSU cleaning motor. Replace the LSU cleaning motor.
  Defective engine PWB. Replace the engine PWB.

• Code: 4700
• Description: VIDEO ASIC device error
• Causes: Faulty connection of the connector between the main PWB and engine PWB. Defective main PWB. Defective engine PWB.
• Remedy: Faulty connection of the connector between the main PWB and engine PWB. Check the installation of the main PWB and engine PWB and reinstall them if necessary.
  Defective main PWB. Replace the main PWB.
  Defective engine PWB. Replace the engine PWB.

• Code: 5301
• Description: Broken eraser lamp K wire
  When the eraser lamp K is driven, the eraser lamp K over-current detection signal is detected continuously for 10 times (1 s) at 100 ms intervals.
• Causes: Defective harness between drum unit K and drum relay PWB (YC3), or improper connector insertion. Defective harness between drum relay PWB (YC1) and engine PWB (YC34), or improper connector insertion. Defective eraser lamp K. Defective engine PWB.
• Remedy: Defective harness between drum unit K and drum relay PWB (YC3), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness.
  Defective harness between drum relay PWB (YC1) and engine PWB (YC34), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness.
  Defective eraser lamp K. Replace the drum unit K..
  Defective engine PWB. Replace the engine PWB.

• Code: 5302
• Description: Broken eraser lamp C wire
  When the eraser lamp C is driven, the eraser lamp C over-current detection signal is detected continuously for 10 times (1 s) at 100 ms intervals.
• Causes: Defective harness between drum unit C and drum relay PWB (YC7), or improper connector insertion. Defective harness between drum relay PWB (YC1) and engine PWB (YC34), or improper connector insertion. Defective eraser lamp C. Defective engine PWB.
• Remedy: Defective harness between drum unit C and drum relay PWB (YC7), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness.
  Defective harness between drum relay PWB (YC1) and engine PWB (YC34), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness.
  Defective eraser lamp C. Replace the drum unit C.
  Defective engine PWB. Replace the engine PWB.

• Code: 5303
• Description: Broken eraser lamp M wire
  When the eraser lamp M is driven, the eraser lamp M over-current detection signal is detected continuously for 10 times (1 s) at 100 ms intervals.
• Causes: Defective harness between drum unit M and drum relay PWB (YC9), or improper connector insertion. Defective harness between drum relay PWB (YC1) and engine PWB (YC34), or improper connector insertion. Defective eraser lamp M. Defective engine PWB.
• Remedy: Defective harness between drum unit M and drum relay PWB (YC9), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness.
  Defective harness between drum relay PWB (YC1) and engine PWB (YC34), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness.
  Defective eraser lamp M. Replace the drum unit M.
  Defective engine PWB. Replace the engine PWB.

• Code: 5304
• Description: Broken eraser lamp Y wire
  When the eraser lamp Y is driven, the eraser lamp Y over-current detection signal is detected continuously for 10 times (1 s) at 100 ms intervals.
• Causes: Defective harness between drum unit Y and drum relay PWB (YC5), or improper connector insertion. Defective harness between drum relay PWB (YC1) and engine PWB (YC34), or improper connector insertion. Defective eraser lamp Y. Defective engine PWB.
• Remedy: Defective harness between drum unit Y and drum relay PWB (YC5), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness.
  Defective harness between drum relay PWB (YC1) and engine PWB (YC34), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness.
  Defective eraser lamp Y. Replace the drum unit Y.
  Defective engine PWB. Replace the engine PWB.

• Code: 6000
• Description: Broken fuser heater lamp 1 wire
  The detected fuser thermistor 1 temperature does not rise 1°C/1.8°F after the fuser heater lamp 1 has been turned on continuously for 10 seconds in warming up. The fuser temperature does not reach 100°C/212°F after the fuser heater lamp 1 has been turned on continuously for 40 seconds in warming up. The detected temperature of fuser thermistor 2 does not reach the specified temperature (ready indication temperature) after fuser heater lamp 1 has been turned on continuously for 90 seconds in warming up. The detected temperature of fuser thermistor 2 does not rise 1°C/1.8°F after fuser heater lamp 1 has been turned on continuously for 10 seconds during printing. The detected temperature of fuser thermistor 2 is 120°C/248°F or less continuously for 3 seconds during printing. The detected temperature of fuser thermistor 2 is 100°C/180°F lower than the detected temperature of fuser thermistor 1 continuously for 3 seconds.
• Causes: Defective harness between fuser thermistor 2 and paper exit PWB (YC5), or improper connector insertion. Defective harness between paper exit PWB (YC1) and engine PWB (YC602), or improper connector insertion. Fuser thermistor 2 installed incorrectly. Fuser thermal cutout triggered. Fuser heater lamp 1 installed incorrectly. Broken fuser heater lamp 1 wire. Defective engine PWB.
• Remedy: Defective harness between fuser thermistor 2 and paper exit PWB (YC5), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness.
  Defective harness between paper exit PWB (YC1) and engine PWB (YC602), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness.
  Fuser thermistor 2 installed incorrectly. Replace the fuser unit.
  Fuser thermal cutout triggered. Replace the fuser unit.
  Fuser heater lamp 1 installed incorrectly. Replace the fuser unit.
  Broken fuser heater lamp 1 wire. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB.

• Code: 6020
• Description: Abnormally high temperature fuser heater lamp 1
  The fuser thermistor 2 detects a temperature higher than 240°C/464°F. By the activation of the high temperature error detection circuit (230°C/446°F or more) of fuser thermistor 1, the illumination of fuser heater lamp 1 was forcibly turned off and 10 seconds has elapsed.
• Causes: Shorted fuser thermistor 2. Defective engine PWB.
• Remedy: Shorted fuser thermistor 2. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB.