• Code: E7-80
• Description: MFP-SCU PWB communication error
• Causes: SCU PWB connector connection trouble. SCU PWB - MFP PWB connection trouble. SCU PWB mother board connection trouble. SCU PWB trouble. MFP PWB trouble. Mother board trouble.
• Remedy: Check connection of the SCU PWB, the MFP PWB, and the mother board. Check the ground. Replace the SCU PWB. Replace the MFP PWB. Replace the mother board.

• Code: E7-90
• Description: MFP - PCU PWB communication error
• Causes: PCU PWB connector connection trouble. PCU PWB - MFP PWB connection trouble. PCU PWB trouble.
  MFP PWB trouble. Mother board trouble.
• Remedy: Check connection of the PCU PWB, the MFP PWB, and the mother board. Check the ground. Replace the PCU PWB. Replace the MFP PWB. Replace the mother board.

• Code: EE-EC
• Description: Automatic toner density adjustment error (Sampling level 26-102/114-200)
  The sampling level in the automatic toner density adjustment is outside of 108
• 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 less than 26 or the control voltage is over 197.
• 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 over 200 or the control voltage is less than 49.
• 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: F1-02
• Description: Finisher paper transport motor trouble
• Causes: Finisher paper transport motor trouble. Harness and connector connection trouble. Finisher control PWB trouble.
• Remedy: Use SIM3-3 to check the operation of the paper transport motor. Replace the paper transport motor. Check connection of the connector and the harness. Replace the finisher control 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.