• Code: 5302
• Description: Broken cleaning lamp C wire
  When the cleaning lamp C is driven, the lamp over-current detection signal is detected continuously for 10 times (1 s) at 100 ms intervals.
• Causes: Defective connector cable or poor contact in the connector. Defective cleaning lamp C. 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. Drum unit C and Drum relay PWB (YC4) Drum relay PWB (YC1) and engine PWB (YC34)
  Defective cleaning lamp C. Replace the drum unit C..
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 5303
• Description: Broken cleaning lamp M wire
  When the cleaning lamp M is driven, the lamp over-current detection signal is detected continuously for 10 times (1 s) at 100 ms intervals.
• Causes: Defective connector cable or poor contact in the connector. Defective cleaning lamp M. 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. Drum unit M and Drum relay PWB (YC3) Drum relay PWB (YC1) and engine PWB (YC34)
  Defective cleaning lamp M. Replace the drum unit M..
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 5304
• Description: Broken cleaning lamp Y wire
  When the cleaning lamp Y is driven, the lamp over-current detection signal is detected continuously for 10 times (1 s) at 100 ms intervals.
• Causes: Defective connector cable or poor contact in the connector. Defective cleaning lamp Y. 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. Drum unit Y and Drum relay PWB (YC5) Drum relay PWB (YC1) and engine PWB (YC34)
  Defective cleaning lamp Y. Replace the drum unit Y..
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6000
• Description: Broken fuser heater wire
  The detected temperature of fuser thermistor does not rise 1„aC/1.8„aF after the fuser heater has been turned on continuously for 10 s in warming up. The fuser temperature does not reach 100„aC/212„aF after the fuser heater has been turned on continuously for 30 s in warming up. The detected temperature of fuser thermistor does not reach the specified temperature (ready indication temperature) after the fuser heater has been turned on continuously for 60 s in warming up. The detected temperature of fuser thermistor does not rise 1„aC/1.8„aF after the fuser heater has been turned on continuously for 10 s during printing.
• Causes: Defective connector cable or poor contact in the connector. Deformed connector pin. Defective triac. Fuser thermostat triggered. Broken fuser heater wire. 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 heater and power source PWB (YC102) Fuser unit and eject PWB (YC3) Eject PWB (YC1) and engine PWB (YC19)
  Fuser thermostat triggered. Reinsert the fuser unit.
  Broken fuser heater wire. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6020
• Description: Abnormally high fuser thermistor temperature
  The fuser thermistor detects a temperature higher than 240C/464F. By the activation of the high temperature error detection circuit (230„aC/446„aF or more) of fuser thermistor, the illumination of fuser heater was forcibly turned off and 10 s has elapsed.
• Causes: Deformed connector pin. Defective triac. Shorted fuser thermistor. Defective engine PWB.
• Remedy: Shorted fuser thermistor. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6030
• Description: Broken fuser thermistor wire
  Input from fuser thermistor is 3 or less (A/D value) continuously for 1 s.
• Causes: Defective connector cable or poor contact in the connector. Deformed connector pin. Defective triac. Broken fuser thermistor wire. Fuser thermostat triggered. Broken fuser heater wire. 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 eject PWB (YC3) Eject PWB (YC1) and engine PWB (YC19)
  Broken fuser thermistor wire. Replace the fuser unit.
  Fuser thermostat triggered. Reinsert the fuser unit.
  Broken fuser heater wire. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6400
• Description: Zero-cross signal error
  The zero-cross signal does not reach the engine PWB for more than 1 s.
• Causes: Defective connector cable or poor contact in the connector. Defective power source PWB or 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 (YC103) and relay PWB (YC1) Relay PWB (YC4) and engine PWB (YC9)
  Defective power source PWB or engine PWB. Replace the power source PWB or the engine PWB and check for correct operation.

• Code: 7001
• Description: Toner motor K error
  When the toner motor K is driven, the motor over-current detection signal is detected continuously for 50 times (5 s) at 100 ms intervals.
• Causes: Defective connector cable or poor contact in the connector. Defective drive transmission system of the toner motor K. Defective toner motor K. 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. Toner motor K and engine PWB (YC23)
  Defective drive transmission system of the toner motor K. Check if the rollers and gears rotate smoothly. If not, grease the bushes and gears. Check for broken gears and replace if any.
  Defective toner motor K. Replace the toner motor K.
  Defective engine PWB. Replace the engine PWB and check for correct operation.