• Code: E7-60
• Description: Combination error between the MFP PWB and other PWB, firmware
• Causes: A PWB or firmware which is not supported by the machine specifications is detected in the MFP PWB. MFP PWB trouble. The PWB/firmware which is not supported by the machine specifications is connected.
• Remedy: Check the kind and the version of the firmware. Check the MFP PWB, and replace it if necessary.

• Code: E7-61
• Description: Combination error between the MFP PWB and the PCU PWB
• Causes: Combination error between the MFP PWB and the PCU PWB. MFP PWB trouble. PCU PWB trouble.
• Remedy: Check the combination between the MFP PWB and the PCU PWB. Replace the MFP PWB. Replace the PCU PWB.

• Code: E7-65
• Description: MFP EEPROM sum check error
• Causes: MFP PWB EEPROM device breakdown. Contact trouble of the MFP EEPROM device. Malfunction due to noises.
• Remedy: Replace the MFP PWB. Replace the MFP PWB EEPROM.

• 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. Replace the mother board.
• 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 motherboard connection trouble. PCU PWB trouble. MFP PWB trouble. Replace the mother board.
• 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 76 - 117/ 139 - 178)
  The sampling level in the automatic toner density adjustment is outside of 128.
• 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 (Overtoner)
  The sampling level in the automatic toner density adjustment is 76 or less or the control voltage is 208 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 (Undertoner)
  The sampling level in the automatic toner density adjustment is 178 or above or the control voltage is 51 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.