• Code: E7-50
• Description: Engine connection trouble
• Causes: A PWB, or firmware, or LSU which is not supported by the machine specifications is detected in the PCU PWB. PCU PWB trouble. LSU trouble.
• Remedy: Check the kind and the version of the firmware. Check the LSU, and replace it if necessary. Check the PCU PWB, and replace it if necessary.

• Code: E7-55
• Description: PWB information sum error (Engine detection)
  PCU EEPROM PWB information sum error
• 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: E7-62
• Description: Combination error between the MFP PWB and the SCU PWB
• Causes: Combination error between the MFP PWB and the SCU PWB. MFP PWB trouble. SCU PWB trouble.
• Remedy: Check the combination between the MFP PWB and the SCU PWB. Replace the MFP PWB. Replace the SCU 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: E7-70
• Description: Combination error between the SCU PWB and the other PWB
• Causes: A SUC PWB /firmware which does not comply with the machine specifications is detected.
  SCU PWB trouble. A PWB/firmware which does not comply with the machine specifications is connected.
• Remedy: Check the firmware kind/version. Check and replace the SCU PWB.

• Code: E7-75
• Description: SCU EEPROM sum check error
• Causes: SCU PWB EEPROM device breakdown. Contact trouble of the SCU EEPROM device. Malfunction due to noises.
• Remedy: Replace the SCU PWB. Replace the SCU PWB EEPROM.