• Code: EE-EC
• Description: Automatic toner density adjustment error
  The sampling level in the automatic toner density adjustment is outside of 128+-3?
• Causes: Toner density sensor trouble. Developing unit trouble. PCU PWB trouble.
• Remedy: Replace the toner density sensor. Replace the developing unit. Replace the PCU PWB.?

• Code: EE-EL
• Description: Automatic toner density adjustment error (Over toner)
  The sampling level in the automatic toner density adjustment is 77 or less or the control voltage is 207 or above.
• Causes: Toner density sensor trouble. Charging voltage/ developing voltage trouble, toner density trouble, or developing unit trouble. PCU PWB trouble.
• Remedy: Replace the toner density sensor. Replace the developing unit. Replace the PCU PWB.

• Code: EE-EU
• Description: Automatic toner density adjustment error (Under toner)
  The sampling level in the automatic toner density adjustment is 177 or above or the control voltage is 52 or less.
• Causes: Toner density sensor trouble. Charging voltage/ developing voltage trouble, toner density trouble, or developing unit trouble. PCU PWB trouble.
• Remedy: Replace the toner density sensor. Replace the developing unit. Replace the PCU PWB.

• Code: F1-00
• Description: Finisher - PCU PWB communication error
• Causes: Connection trouble of the connector and the harness between the finisher and the PCU PWB. Finisher control PWB trouble. PCU PWB trouble. Strong external noises.
• Remedy: Check the connector and the harness between the finisher and the PCU PWB. Replace the finisher control PWB. Replace the PCU PWB.

• Code: F1-03
• Description: Finisher paper exit roller lifting operation trouble
• Causes: Finisher paper exit roller lift motor trouble. Harness and connector connection trouble. Home position sensor trouble. Finisher control PWB trouble.
• Remedy: Use SIM3-3 to check the operation of the paper exit roller lift motor. Replace the paper exit roller lift motor. Check connection of the connector and the harness. Replace the home position sensor. Replace the finisher control PWB.

• Code: F1-08
• Description: Stapler shift trouble
• Causes: Stapler shift motor trouble. Finisher control PWB trouble. Home position sensor trouble.
• Remedy: Use SIM3-3 to check the operation of the stapler shift motor. Replace the stapler shift motor. Check connection of the connector and the harness. Replace the home position sensor. Replace the finisher control PWB.

• Code: F1-10
• Description: Staple operation trouble
• Causes: Staple motor trouble. Finisher control PWB trouble. Home position sensor trouble.
• Remedy: Use SIM3-3 to check the operation of the staple motor. Replace the staple motor. Check connection of the connector and the harness. Replace the home position sensor. Replace the finisher control PWB.

• Code: F1-11
• Description: Finisher grip operation trouble
• Causes: Grip motor trouble. Finisher control PWB trouble. Grip arm trouble. Home position sensor trouble.
• Remedy: Use SIM3-3 to check the operation of the grip motor. Replace the grip motor. Replace the finisher control PWB. Replace the grip arm. Replace the home position sensor.