• Code: E7-55
• Description: PWB information sum error (Engine detection)
• Causes: PCU EEPROM sum check error. PCU EEPROM trouble. PCU EEPROM contact trouble. Malfunction due to noises
• Remedy: Replace the PCU PWB. Replace the PCU EEPROM.

• 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. 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: E7-89
• Description: Communication error between MFPc PWB CPU and energy-saving NIC controller
• Causes: No response can be obtained from the energy-saving NIC controller
• Remedy: Replace the MFP PWB.

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

• Code: E7-91
• Description: FAX reception image data error
• Causes: Image data process abnormality. HDD trouble. SD card trouble or contact error. Image compression data corruption. MFP PWB trouble. FAX control PWB trouble.
• Remedy: Use SIM60-1 to check the read/write operations of the memory. Replace the HDD. Replace or check installation of the SD card. Replace the MFP PWB. Replace the FAX control PWB.