• 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.
• Remedy: Defective harness between drum unit Y and drum relay PWB (YC5/YC6), 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 wire The detected fuser thermistor temperature does not rise 1C/1.8F after the fuser heater lamp has been turned on continuously for 10 seconds in warming up. The fuser temperature does not reach 100C/212F after the fuser heater lamp has been turned on continuously for 40 seconds in warming up. The detected temperature of fuser thermistor does not reach the specified temperature (ready indication temperature) after fuser heater lamp has been turned on continuously for 90 seconds in warming up. The detected temperature of fuser thermistor 2 does not rise 1C/1.8F after fuser heater lamp has been turned on continuously for 10 seconds during printing.
• Remedy: Defective harness between fuser thermistor and paper exit PWB (YC4), 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 (YC20), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness.
  Fuser thermistor installed incorrectly. Replace the fuser unit.
  Fuser thermal cutout triggered. Replace the fuser unit.
  Fuser heater lamp installed incorrectly. Replace the fuser unit.
  Broken fuser heater lamp wire. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB.

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

• Code: 6030
• Description: Broken fuser thermistor wire Input from fuser thermistor is 3 or less (A/D value) continuously for 1.1 second (11 ms X 100 times).
• Remedy: Defective harness between fuser thermistor and paper exit PWB (YC4), 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 (YC20), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness.
  Broken fuser thermistor wire. Replace the fuser unit.
  Fuser thermistor installed incorrectly. Replace the fuser unit.
  Fuser thermal cutout triggered. Replace the fuser unit.
  Fuser heater lamp installed incorrectly. Replace the fuser unit.
  Broken fuser heater lamp wire. Replace the fuser unit.
  Defective engine PWB. Replace the engine PWB.

• Code: 6400
• Description: Zero cross signal error The zero cross signal does not reach the engine PWB for specified time.
• Remedy: Defective harness between power source PWB (YC103) and engine PWB (YC19), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness.
  Defective power source PWB. Replace the power source PWB.
  Defective engine PWB. Replace the engine PWB.

• Code: 7001
• Description: Toner motor K error When the toner motor K is driven, the toner motor K over-current detection signal is detected continuously for 50 times (5 s) at 100 ms intervals.
• Remedy: Defective harness between toner motor K and engine PWB (YC22), 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 toner motor K. Check if the gears rotate smoothly. If not, grease the bushings 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.

• Code: 7002
• Description: Toner motor C error When the toner motor C is driven, the toner motor C over-current detection signal is detected continuously for 50 times (5 s) at 100 ms intervals.
• Remedy: Defective harness between toner motor C and engine PWB (YC24), 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 toner motor C. Check if the gears rotate smoothly. If not, grease the bushings and gears. Check for broken gears and replace if any.
  Defective toner motor C. Replace the toner motor C.
  Defective engine PWB. Replace the engine PWB.

• Code: 7003
• Description: Toner motor M error When the toner motor M is driven, the toner motor M over-current detection signal is detected continuously for 50 times (5 s) at 100 ms intervals.
• Remedy: Defective harness between toner motor M and engine PWB (YC25), 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 toner motor M. Check if the gears rotate smoothly. If not, grease the bushings and gears. Check for broken gears and replace if any.
  Defective toner motor M. Replace the toner motor M.
  Defective engine PWB. Replace the engine PWB.